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-rw-r--r--src/leveldb/table/block.cc69
-rw-r--r--src/leveldb/table/block.h16
-rw-r--r--src/leveldb/table/block_builder.cc23
-rw-r--r--src/leveldb/table/block_builder.h26
-rw-r--r--src/leveldb/table/filter_block.cc19
-rw-r--r--src/leveldb/table/filter_block.h21
-rw-r--r--src/leveldb/table/filter_block_test.cc38
-rw-r--r--src/leveldb/table/format.cc11
-rw-r--r--src/leveldb/table/format.h42
-rw-r--r--src/leveldb/table/iterator.cc75
-rw-r--r--src/leveldb/table/iterator_wrapper.h58
-rw-r--r--src/leveldb/table/merger.cc52
-rw-r--r--src/leveldb/table/merger.h4
-rw-r--r--src/leveldb/table/table.cc68
-rw-r--r--src/leveldb/table/table_builder.cc61
-rw-r--r--src/leveldb/table/table_test.cc315
-rw-r--r--src/leveldb/table/two_level_iterator.cc91
-rw-r--r--src/leveldb/table/two_level_iterator.h11
18 files changed, 468 insertions, 532 deletions
diff --git a/src/leveldb/table/block.cc b/src/leveldb/table/block.cc
index 43e402c9c0..2fe89eaa45 100644
--- a/src/leveldb/table/block.cc
+++ b/src/leveldb/table/block.cc
@@ -6,8 +6,10 @@
#include "table/block.h"
-#include <vector>
#include <algorithm>
+#include <cstdint>
+#include <vector>
+
#include "leveldb/comparator.h"
#include "table/format.h"
#include "util/coding.h"
@@ -27,7 +29,7 @@ Block::Block(const BlockContents& contents)
if (size_ < sizeof(uint32_t)) {
size_ = 0; // Error marker
} else {
- size_t max_restarts_allowed = (size_-sizeof(uint32_t)) / sizeof(uint32_t);
+ size_t max_restarts_allowed = (size_ - sizeof(uint32_t)) / sizeof(uint32_t);
if (NumRestarts() > max_restarts_allowed) {
// The size is too small for NumRestarts()
size_ = 0;
@@ -48,27 +50,26 @@ Block::~Block() {
// and the length of the value in "*shared", "*non_shared", and
// "*value_length", respectively. Will not dereference past "limit".
//
-// If any errors are detected, returns NULL. Otherwise, returns a
+// If any errors are detected, returns nullptr. Otherwise, returns a
// pointer to the key delta (just past the three decoded values).
static inline const char* DecodeEntry(const char* p, const char* limit,
- uint32_t* shared,
- uint32_t* non_shared,
+ uint32_t* shared, uint32_t* non_shared,
uint32_t* value_length) {
- if (limit - p < 3) return NULL;
- *shared = reinterpret_cast<const unsigned char*>(p)[0];
- *non_shared = reinterpret_cast<const unsigned char*>(p)[1];
- *value_length = reinterpret_cast<const unsigned char*>(p)[2];
+ if (limit - p < 3) return nullptr;
+ *shared = reinterpret_cast<const uint8_t*>(p)[0];
+ *non_shared = reinterpret_cast<const uint8_t*>(p)[1];
+ *value_length = reinterpret_cast<const uint8_t*>(p)[2];
if ((*shared | *non_shared | *value_length) < 128) {
// Fast path: all three values are encoded in one byte each
p += 3;
} else {
- if ((p = GetVarint32Ptr(p, limit, shared)) == NULL) return NULL;
- if ((p = GetVarint32Ptr(p, limit, non_shared)) == NULL) return NULL;
- if ((p = GetVarint32Ptr(p, limit, value_length)) == NULL) return NULL;
+ if ((p = GetVarint32Ptr(p, limit, shared)) == nullptr) return nullptr;
+ if ((p = GetVarint32Ptr(p, limit, non_shared)) == nullptr) return nullptr;
+ if ((p = GetVarint32Ptr(p, limit, value_length)) == nullptr) return nullptr;
}
if (static_cast<uint32_t>(limit - p) < (*non_shared + *value_length)) {
- return NULL;
+ return nullptr;
}
return p;
}
@@ -76,9 +77,9 @@ static inline const char* DecodeEntry(const char* p, const char* limit,
class Block::Iter : public Iterator {
private:
const Comparator* const comparator_;
- const char* const data_; // underlying block contents
- uint32_t const restarts_; // Offset of restart array (list of fixed32)
- uint32_t const num_restarts_; // Number of uint32_t entries in restart array
+ const char* const data_; // underlying block contents
+ uint32_t const restarts_; // Offset of restart array (list of fixed32)
+ uint32_t const num_restarts_; // Number of uint32_t entries in restart array
// current_ is offset in data_ of current entry. >= restarts_ if !Valid
uint32_t current_;
@@ -112,9 +113,7 @@ class Block::Iter : public Iterator {
}
public:
- Iter(const Comparator* comparator,
- const char* data,
- uint32_t restarts,
+ Iter(const Comparator* comparator, const char* data, uint32_t restarts,
uint32_t num_restarts)
: comparator_(comparator),
data_(data),
@@ -125,23 +124,23 @@ class Block::Iter : public Iterator {
assert(num_restarts_ > 0);
}
- virtual bool Valid() const { return current_ < restarts_; }
- virtual Status status() const { return status_; }
- virtual Slice key() const {
+ bool Valid() const override { return current_ < restarts_; }
+ Status status() const override { return status_; }
+ Slice key() const override {
assert(Valid());
return key_;
}
- virtual Slice value() const {
+ Slice value() const override {
assert(Valid());
return value_;
}
- virtual void Next() {
+ void Next() override {
assert(Valid());
ParseNextKey();
}
- virtual void Prev() {
+ void Prev() override {
assert(Valid());
// Scan backwards to a restart point before current_
@@ -162,7 +161,7 @@ class Block::Iter : public Iterator {
} while (ParseNextKey() && NextEntryOffset() < original);
}
- virtual void Seek(const Slice& target) {
+ void Seek(const Slice& target) override {
// Binary search in restart array to find the last restart point
// with a key < target
uint32_t left = 0;
@@ -171,10 +170,10 @@ class Block::Iter : public Iterator {
uint32_t mid = (left + right + 1) / 2;
uint32_t region_offset = GetRestartPoint(mid);
uint32_t shared, non_shared, value_length;
- const char* key_ptr = DecodeEntry(data_ + region_offset,
- data_ + restarts_,
- &shared, &non_shared, &value_length);
- if (key_ptr == NULL || (shared != 0)) {
+ const char* key_ptr =
+ DecodeEntry(data_ + region_offset, data_ + restarts_, &shared,
+ &non_shared, &value_length);
+ if (key_ptr == nullptr || (shared != 0)) {
CorruptionError();
return;
}
@@ -202,12 +201,12 @@ class Block::Iter : public Iterator {
}
}
- virtual void SeekToFirst() {
+ void SeekToFirst() override {
SeekToRestartPoint(0);
ParseNextKey();
}
- virtual void SeekToLast() {
+ void SeekToLast() override {
SeekToRestartPoint(num_restarts_ - 1);
while (ParseNextKey() && NextEntryOffset() < restarts_) {
// Keep skipping
@@ -237,7 +236,7 @@ class Block::Iter : public Iterator {
// Decode next entry
uint32_t shared, non_shared, value_length;
p = DecodeEntry(p, limit, &shared, &non_shared, &value_length);
- if (p == NULL || key_.size() < shared) {
+ if (p == nullptr || key_.size() < shared) {
CorruptionError();
return false;
} else {
@@ -253,7 +252,7 @@ class Block::Iter : public Iterator {
}
};
-Iterator* Block::NewIterator(const Comparator* cmp) {
+Iterator* Block::NewIterator(const Comparator* comparator) {
if (size_ < sizeof(uint32_t)) {
return NewErrorIterator(Status::Corruption("bad block contents"));
}
@@ -261,7 +260,7 @@ Iterator* Block::NewIterator(const Comparator* cmp) {
if (num_restarts == 0) {
return NewEmptyIterator();
} else {
- return new Iter(cmp, data_, restart_offset_, num_restarts);
+ return new Iter(comparator, data_, restart_offset_, num_restarts);
}
}
diff --git a/src/leveldb/table/block.h b/src/leveldb/table/block.h
index 2493eb9f9f..c8f1f7b436 100644
--- a/src/leveldb/table/block.h
+++ b/src/leveldb/table/block.h
@@ -7,6 +7,7 @@
#include <stddef.h>
#include <stdint.h>
+
#include "leveldb/iterator.h"
namespace leveldb {
@@ -19,24 +20,23 @@ class Block {
// Initialize the block with the specified contents.
explicit Block(const BlockContents& contents);
+ Block(const Block&) = delete;
+ Block& operator=(const Block&) = delete;
+
~Block();
size_t size() const { return size_; }
Iterator* NewIterator(const Comparator* comparator);
private:
+ class Iter;
+
uint32_t NumRestarts() const;
const char* data_;
size_t size_;
- uint32_t restart_offset_; // Offset in data_ of restart array
- bool owned_; // Block owns data_[]
-
- // No copying allowed
- Block(const Block&);
- void operator=(const Block&);
-
- class Iter;
+ uint32_t restart_offset_; // Offset in data_ of restart array
+ bool owned_; // Block owns data_[]
};
} // namespace leveldb
diff --git a/src/leveldb/table/block_builder.cc b/src/leveldb/table/block_builder.cc
index db660cd07c..919cff5c93 100644
--- a/src/leveldb/table/block_builder.cc
+++ b/src/leveldb/table/block_builder.cc
@@ -28,36 +28,35 @@
#include "table/block_builder.h"
-#include <algorithm>
#include <assert.h>
+
+#include <algorithm>
+
#include "leveldb/comparator.h"
-#include "leveldb/table_builder.h"
+#include "leveldb/options.h"
#include "util/coding.h"
namespace leveldb {
BlockBuilder::BlockBuilder(const Options* options)
- : options_(options),
- restarts_(),
- counter_(0),
- finished_(false) {
+ : options_(options), restarts_(), counter_(0), finished_(false) {
assert(options->block_restart_interval >= 1);
- restarts_.push_back(0); // First restart point is at offset 0
+ restarts_.push_back(0); // First restart point is at offset 0
}
void BlockBuilder::Reset() {
buffer_.clear();
restarts_.clear();
- restarts_.push_back(0); // First restart point is at offset 0
+ restarts_.push_back(0); // First restart point is at offset 0
counter_ = 0;
finished_ = false;
last_key_.clear();
}
size_t BlockBuilder::CurrentSizeEstimate() const {
- return (buffer_.size() + // Raw data buffer
- restarts_.size() * sizeof(uint32_t) + // Restart array
- sizeof(uint32_t)); // Restart array length
+ return (buffer_.size() + // Raw data buffer
+ restarts_.size() * sizeof(uint32_t) + // Restart array
+ sizeof(uint32_t)); // Restart array length
}
Slice BlockBuilder::Finish() {
@@ -74,7 +73,7 @@ void BlockBuilder::Add(const Slice& key, const Slice& value) {
Slice last_key_piece(last_key_);
assert(!finished_);
assert(counter_ <= options_->block_restart_interval);
- assert(buffer_.empty() // No values yet?
+ assert(buffer_.empty() // No values yet?
|| options_->comparator->Compare(key, last_key_piece) > 0);
size_t shared = 0;
if (counter_ < options_->block_restart_interval) {
diff --git a/src/leveldb/table/block_builder.h b/src/leveldb/table/block_builder.h
index 4fbcb33972..f91f5e6d47 100644
--- a/src/leveldb/table/block_builder.h
+++ b/src/leveldb/table/block_builder.h
@@ -5,9 +5,10 @@
#ifndef STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
#define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
+#include <stdint.h>
+
#include <vector>
-#include <stdint.h>
#include "leveldb/slice.h"
namespace leveldb {
@@ -18,6 +19,9 @@ class BlockBuilder {
public:
explicit BlockBuilder(const Options* options);
+ BlockBuilder(const BlockBuilder&) = delete;
+ BlockBuilder& operator=(const BlockBuilder&) = delete;
+
// Reset the contents as if the BlockBuilder was just constructed.
void Reset();
@@ -35,21 +39,15 @@ class BlockBuilder {
size_t CurrentSizeEstimate() const;
// Return true iff no entries have been added since the last Reset()
- bool empty() const {
- return buffer_.empty();
- }
+ bool empty() const { return buffer_.empty(); }
private:
- const Options* options_;
- std::string buffer_; // Destination buffer
- std::vector<uint32_t> restarts_; // Restart points
- int counter_; // Number of entries emitted since restart
- bool finished_; // Has Finish() been called?
- std::string last_key_;
-
- // No copying allowed
- BlockBuilder(const BlockBuilder&);
- void operator=(const BlockBuilder&);
+ const Options* options_;
+ std::string buffer_; // Destination buffer
+ std::vector<uint32_t> restarts_; // Restart points
+ int counter_; // Number of entries emitted since restart
+ bool finished_; // Has Finish() been called?
+ std::string last_key_;
};
} // namespace leveldb
diff --git a/src/leveldb/table/filter_block.cc b/src/leveldb/table/filter_block.cc
index 1ed5134170..09ec0094bd 100644
--- a/src/leveldb/table/filter_block.cc
+++ b/src/leveldb/table/filter_block.cc
@@ -16,8 +16,7 @@ static const size_t kFilterBaseLg = 11;
static const size_t kFilterBase = 1 << kFilterBaseLg;
FilterBlockBuilder::FilterBlockBuilder(const FilterPolicy* policy)
- : policy_(policy) {
-}
+ : policy_(policy) {}
void FilterBlockBuilder::StartBlock(uint64_t block_offset) {
uint64_t filter_index = (block_offset / kFilterBase);
@@ -62,7 +61,7 @@ void FilterBlockBuilder::GenerateFilter() {
tmp_keys_.resize(num_keys);
for (size_t i = 0; i < num_keys; i++) {
const char* base = keys_.data() + start_[i];
- size_t length = start_[i+1] - start_[i];
+ size_t length = start_[i + 1] - start_[i];
tmp_keys_[i] = Slice(base, length);
}
@@ -77,14 +76,10 @@ void FilterBlockBuilder::GenerateFilter() {
FilterBlockReader::FilterBlockReader(const FilterPolicy* policy,
const Slice& contents)
- : policy_(policy),
- data_(NULL),
- offset_(NULL),
- num_(0),
- base_lg_(0) {
+ : policy_(policy), data_(nullptr), offset_(nullptr), num_(0), base_lg_(0) {
size_t n = contents.size();
if (n < 5) return; // 1 byte for base_lg_ and 4 for start of offset array
- base_lg_ = contents[n-1];
+ base_lg_ = contents[n - 1];
uint32_t last_word = DecodeFixed32(contents.data() + n - 5);
if (last_word > n - 5) return;
data_ = contents.data();
@@ -95,8 +90,8 @@ FilterBlockReader::FilterBlockReader(const FilterPolicy* policy,
bool FilterBlockReader::KeyMayMatch(uint64_t block_offset, const Slice& key) {
uint64_t index = block_offset >> base_lg_;
if (index < num_) {
- uint32_t start = DecodeFixed32(offset_ + index*4);
- uint32_t limit = DecodeFixed32(offset_ + index*4 + 4);
+ uint32_t start = DecodeFixed32(offset_ + index * 4);
+ uint32_t limit = DecodeFixed32(offset_ + index * 4 + 4);
if (start <= limit && limit <= static_cast<size_t>(offset_ - data_)) {
Slice filter = Slice(data_ + start, limit - start);
return policy_->KeyMayMatch(key, filter);
@@ -108,4 +103,4 @@ bool FilterBlockReader::KeyMayMatch(uint64_t block_offset, const Slice& key) {
return true; // Errors are treated as potential matches
}
-}
+} // namespace leveldb
diff --git a/src/leveldb/table/filter_block.h b/src/leveldb/table/filter_block.h
index c67d010bd1..73b5399249 100644
--- a/src/leveldb/table/filter_block.h
+++ b/src/leveldb/table/filter_block.h
@@ -11,8 +11,10 @@
#include <stddef.h>
#include <stdint.h>
+
#include <string>
#include <vector>
+
#include "leveldb/slice.h"
#include "util/hash.h"
@@ -30,6 +32,9 @@ class FilterBlockBuilder {
public:
explicit FilterBlockBuilder(const FilterPolicy*);
+ FilterBlockBuilder(const FilterBlockBuilder&) = delete;
+ FilterBlockBuilder& operator=(const FilterBlockBuilder&) = delete;
+
void StartBlock(uint64_t block_offset);
void AddKey(const Slice& key);
Slice Finish();
@@ -38,20 +43,16 @@ class FilterBlockBuilder {
void GenerateFilter();
const FilterPolicy* policy_;
- std::string keys_; // Flattened key contents
- std::vector<size_t> start_; // Starting index in keys_ of each key
- std::string result_; // Filter data computed so far
- std::vector<Slice> tmp_keys_; // policy_->CreateFilter() argument
+ std::string keys_; // Flattened key contents
+ std::vector<size_t> start_; // Starting index in keys_ of each key
+ std::string result_; // Filter data computed so far
+ std::vector<Slice> tmp_keys_; // policy_->CreateFilter() argument
std::vector<uint32_t> filter_offsets_;
-
- // No copying allowed
- FilterBlockBuilder(const FilterBlockBuilder&);
- void operator=(const FilterBlockBuilder&);
};
class FilterBlockReader {
public:
- // REQUIRES: "contents" and *policy must stay live while *this is live.
+ // REQUIRES: "contents" and *policy must stay live while *this is live.
FilterBlockReader(const FilterPolicy* policy, const Slice& contents);
bool KeyMayMatch(uint64_t block_offset, const Slice& key);
@@ -63,6 +64,6 @@ class FilterBlockReader {
size_t base_lg_; // Encoding parameter (see kFilterBaseLg in .cc file)
};
-}
+} // namespace leveldb
#endif // STORAGE_LEVELDB_TABLE_FILTER_BLOCK_H_
diff --git a/src/leveldb/table/filter_block_test.cc b/src/leveldb/table/filter_block_test.cc
index 8c4a4741f2..8b33bbdd18 100644
--- a/src/leveldb/table/filter_block_test.cc
+++ b/src/leveldb/table/filter_block_test.cc
@@ -16,18 +16,16 @@ namespace leveldb {
// For testing: emit an array with one hash value per key
class TestHashFilter : public FilterPolicy {
public:
- virtual const char* Name() const {
- return "TestHashFilter";
- }
+ const char* Name() const override { return "TestHashFilter"; }
- virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const {
+ void CreateFilter(const Slice* keys, int n, std::string* dst) const override {
for (int i = 0; i < n; i++) {
uint32_t h = Hash(keys[i].data(), keys[i].size(), 1);
PutFixed32(dst, h);
}
}
- virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const {
+ bool KeyMayMatch(const Slice& key, const Slice& filter) const override {
uint32_t h = Hash(key.data(), key.size(), 1);
for (size_t i = 0; i + 4 <= filter.size(); i += 4) {
if (h == DecodeFixed32(filter.data() + i)) {
@@ -69,8 +67,8 @@ TEST(FilterBlockTest, SingleChunk) {
ASSERT_TRUE(reader.KeyMayMatch(100, "box"));
ASSERT_TRUE(reader.KeyMayMatch(100, "hello"));
ASSERT_TRUE(reader.KeyMayMatch(100, "foo"));
- ASSERT_TRUE(! reader.KeyMayMatch(100, "missing"));
- ASSERT_TRUE(! reader.KeyMayMatch(100, "other"));
+ ASSERT_TRUE(!reader.KeyMayMatch(100, "missing"));
+ ASSERT_TRUE(!reader.KeyMayMatch(100, "other"));
}
TEST(FilterBlockTest, MultiChunk) {
@@ -99,30 +97,28 @@ TEST(FilterBlockTest, MultiChunk) {
// Check first filter
ASSERT_TRUE(reader.KeyMayMatch(0, "foo"));
ASSERT_TRUE(reader.KeyMayMatch(2000, "bar"));
- ASSERT_TRUE(! reader.KeyMayMatch(0, "box"));
- ASSERT_TRUE(! reader.KeyMayMatch(0, "hello"));
+ ASSERT_TRUE(!reader.KeyMayMatch(0, "box"));
+ ASSERT_TRUE(!reader.KeyMayMatch(0, "hello"));
// Check second filter
ASSERT_TRUE(reader.KeyMayMatch(3100, "box"));
- ASSERT_TRUE(! reader.KeyMayMatch(3100, "foo"));
- ASSERT_TRUE(! reader.KeyMayMatch(3100, "bar"));
- ASSERT_TRUE(! reader.KeyMayMatch(3100, "hello"));
+ ASSERT_TRUE(!reader.KeyMayMatch(3100, "foo"));
+ ASSERT_TRUE(!reader.KeyMayMatch(3100, "bar"));
+ ASSERT_TRUE(!reader.KeyMayMatch(3100, "hello"));
// Check third filter (empty)
- ASSERT_TRUE(! reader.KeyMayMatch(4100, "foo"));
- ASSERT_TRUE(! reader.KeyMayMatch(4100, "bar"));
- ASSERT_TRUE(! reader.KeyMayMatch(4100, "box"));
- ASSERT_TRUE(! reader.KeyMayMatch(4100, "hello"));
+ ASSERT_TRUE(!reader.KeyMayMatch(4100, "foo"));
+ ASSERT_TRUE(!reader.KeyMayMatch(4100, "bar"));
+ ASSERT_TRUE(!reader.KeyMayMatch(4100, "box"));
+ ASSERT_TRUE(!reader.KeyMayMatch(4100, "hello"));
// Check last filter
ASSERT_TRUE(reader.KeyMayMatch(9000, "box"));
ASSERT_TRUE(reader.KeyMayMatch(9000, "hello"));
- ASSERT_TRUE(! reader.KeyMayMatch(9000, "foo"));
- ASSERT_TRUE(! reader.KeyMayMatch(9000, "bar"));
+ ASSERT_TRUE(!reader.KeyMayMatch(9000, "foo"));
+ ASSERT_TRUE(!reader.KeyMayMatch(9000, "bar"));
}
} // namespace leveldb
-int main(int argc, char** argv) {
- return leveldb::test::RunAllTests();
-}
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
diff --git a/src/leveldb/table/format.cc b/src/leveldb/table/format.cc
index 285e1c0de3..a3d67de2e4 100644
--- a/src/leveldb/table/format.cc
+++ b/src/leveldb/table/format.cc
@@ -21,8 +21,7 @@ void BlockHandle::EncodeTo(std::string* dst) const {
}
Status BlockHandle::DecodeFrom(Slice* input) {
- if (GetVarint64(input, &offset_) &&
- GetVarint64(input, &size_)) {
+ if (GetVarint64(input, &offset_) && GetVarint64(input, &size_)) {
return Status::OK();
} else {
return Status::Corruption("bad block handle");
@@ -62,10 +61,8 @@ Status Footer::DecodeFrom(Slice* input) {
return result;
}
-Status ReadBlock(RandomAccessFile* file,
- const ReadOptions& options,
- const BlockHandle& handle,
- BlockContents* result) {
+Status ReadBlock(RandomAccessFile* file, const ReadOptions& options,
+ const BlockHandle& handle, BlockContents* result) {
result->data = Slice();
result->cachable = false;
result->heap_allocated = false;
@@ -86,7 +83,7 @@ Status ReadBlock(RandomAccessFile* file,
}
// Check the crc of the type and the block contents
- const char* data = contents.data(); // Pointer to where Read put the data
+ const char* data = contents.data(); // Pointer to where Read put the data
if (options.verify_checksums) {
const uint32_t crc = crc32c::Unmask(DecodeFixed32(data + n + 1));
const uint32_t actual = crc32c::Value(data, n + 1);
diff --git a/src/leveldb/table/format.h b/src/leveldb/table/format.h
index 6c0b80c017..e49dfdc047 100644
--- a/src/leveldb/table/format.h
+++ b/src/leveldb/table/format.h
@@ -5,8 +5,10 @@
#ifndef STORAGE_LEVELDB_TABLE_FORMAT_H_
#define STORAGE_LEVELDB_TABLE_FORMAT_H_
-#include <string>
#include <stdint.h>
+
+#include <string>
+
#include "leveldb/slice.h"
#include "leveldb/status.h"
#include "leveldb/table_builder.h"
@@ -21,6 +23,9 @@ struct ReadOptions;
// block or a meta block.
class BlockHandle {
public:
+ // Maximum encoding length of a BlockHandle
+ enum { kMaxEncodedLength = 10 + 10 };
+
BlockHandle();
// The offset of the block in the file.
@@ -34,9 +39,6 @@ class BlockHandle {
void EncodeTo(std::string* dst) const;
Status DecodeFrom(Slice* input);
- // Maximum encoding length of a BlockHandle
- enum { kMaxEncodedLength = 10 + 10 };
-
private:
uint64_t offset_;
uint64_t size_;
@@ -46,30 +48,24 @@ class BlockHandle {
// end of every table file.
class Footer {
public:
- Footer() { }
+ // Encoded length of a Footer. Note that the serialization of a
+ // Footer will always occupy exactly this many bytes. It consists
+ // of two block handles and a magic number.
+ enum { kEncodedLength = 2 * BlockHandle::kMaxEncodedLength + 8 };
+
+ Footer() = default;
// The block handle for the metaindex block of the table
const BlockHandle& metaindex_handle() const { return metaindex_handle_; }
void set_metaindex_handle(const BlockHandle& h) { metaindex_handle_ = h; }
// The block handle for the index block of the table
- const BlockHandle& index_handle() const {
- return index_handle_;
- }
- void set_index_handle(const BlockHandle& h) {
- index_handle_ = h;
- }
+ const BlockHandle& index_handle() const { return index_handle_; }
+ void set_index_handle(const BlockHandle& h) { index_handle_ = h; }
void EncodeTo(std::string* dst) const;
Status DecodeFrom(Slice* input);
- // Encoded length of a Footer. Note that the serialization of a
- // Footer will always occupy exactly this many bytes. It consists
- // of two block handles and a magic number.
- enum {
- kEncodedLength = 2*BlockHandle::kMaxEncodedLength + 8
- };
-
private:
BlockHandle metaindex_handle_;
BlockHandle index_handle_;
@@ -91,17 +87,13 @@ struct BlockContents {
// Read the block identified by "handle" from "file". On failure
// return non-OK. On success fill *result and return OK.
-extern Status ReadBlock(RandomAccessFile* file,
- const ReadOptions& options,
- const BlockHandle& handle,
- BlockContents* result);
+Status ReadBlock(RandomAccessFile* file, const ReadOptions& options,
+ const BlockHandle& handle, BlockContents* result);
// Implementation details follow. Clients should ignore,
inline BlockHandle::BlockHandle()
- : offset_(~static_cast<uint64_t>(0)),
- size_(~static_cast<uint64_t>(0)) {
-}
+ : offset_(~static_cast<uint64_t>(0)), size_(~static_cast<uint64_t>(0)) {}
} // namespace leveldb
diff --git a/src/leveldb/table/iterator.cc b/src/leveldb/table/iterator.cc
index 3d1c87fdec..dfef083d4d 100644
--- a/src/leveldb/table/iterator.cc
+++ b/src/leveldb/table/iterator.cc
@@ -7,58 +7,67 @@
namespace leveldb {
Iterator::Iterator() {
- cleanup_.function = NULL;
- cleanup_.next = NULL;
+ cleanup_head_.function = nullptr;
+ cleanup_head_.next = nullptr;
}
Iterator::~Iterator() {
- if (cleanup_.function != NULL) {
- (*cleanup_.function)(cleanup_.arg1, cleanup_.arg2);
- for (Cleanup* c = cleanup_.next; c != NULL; ) {
- (*c->function)(c->arg1, c->arg2);
- Cleanup* next = c->next;
- delete c;
- c = next;
+ if (!cleanup_head_.IsEmpty()) {
+ cleanup_head_.Run();
+ for (CleanupNode* node = cleanup_head_.next; node != nullptr;) {
+ node->Run();
+ CleanupNode* next_node = node->next;
+ delete node;
+ node = next_node;
}
}
}
void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) {
- assert(func != NULL);
- Cleanup* c;
- if (cleanup_.function == NULL) {
- c = &cleanup_;
+ assert(func != nullptr);
+ CleanupNode* node;
+ if (cleanup_head_.IsEmpty()) {
+ node = &cleanup_head_;
} else {
- c = new Cleanup;
- c->next = cleanup_.next;
- cleanup_.next = c;
+ node = new CleanupNode();
+ node->next = cleanup_head_.next;
+ cleanup_head_.next = node;
}
- c->function = func;
- c->arg1 = arg1;
- c->arg2 = arg2;
+ node->function = func;
+ node->arg1 = arg1;
+ node->arg2 = arg2;
}
namespace {
+
class EmptyIterator : public Iterator {
public:
- EmptyIterator(const Status& s) : status_(s) { }
- virtual bool Valid() const { return false; }
- virtual void Seek(const Slice& target) { }
- virtual void SeekToFirst() { }
- virtual void SeekToLast() { }
- virtual void Next() { assert(false); }
- virtual void Prev() { assert(false); }
- Slice key() const { assert(false); return Slice(); }
- Slice value() const { assert(false); return Slice(); }
- virtual Status status() const { return status_; }
+ EmptyIterator(const Status& s) : status_(s) {}
+ ~EmptyIterator() override = default;
+
+ bool Valid() const override { return false; }
+ void Seek(const Slice& target) override {}
+ void SeekToFirst() override {}
+ void SeekToLast() override {}
+ void Next() override { assert(false); }
+ void Prev() override { assert(false); }
+ Slice key() const override {
+ assert(false);
+ return Slice();
+ }
+ Slice value() const override {
+ assert(false);
+ return Slice();
+ }
+ Status status() const override { return status_; }
+
private:
Status status_;
};
-} // namespace
-Iterator* NewEmptyIterator() {
- return new EmptyIterator(Status::OK());
-}
+} // anonymous namespace
+
+Iterator* NewEmptyIterator() { return new EmptyIterator(Status::OK()); }
Iterator* NewErrorIterator(const Status& status) {
return new EmptyIterator(status);
diff --git a/src/leveldb/table/iterator_wrapper.h b/src/leveldb/table/iterator_wrapper.h
index f410c3fabe..c230572529 100644
--- a/src/leveldb/table/iterator_wrapper.h
+++ b/src/leveldb/table/iterator_wrapper.h
@@ -16,10 +16,8 @@ namespace leveldb {
// cache locality.
class IteratorWrapper {
public:
- IteratorWrapper(): iter_(NULL), valid_(false) { }
- explicit IteratorWrapper(Iterator* iter): iter_(NULL) {
- Set(iter);
- }
+ IteratorWrapper() : iter_(nullptr), valid_(false) {}
+ explicit IteratorWrapper(Iterator* iter) : iter_(nullptr) { Set(iter); }
~IteratorWrapper() { delete iter_; }
Iterator* iter() const { return iter_; }
@@ -28,25 +26,53 @@ class IteratorWrapper {
void Set(Iterator* iter) {
delete iter_;
iter_ = iter;
- if (iter_ == NULL) {
+ if (iter_ == nullptr) {
valid_ = false;
} else {
Update();
}
}
-
// Iterator interface methods
- bool Valid() const { return valid_; }
- Slice key() const { assert(Valid()); return key_; }
- Slice value() const { assert(Valid()); return iter_->value(); }
- // Methods below require iter() != NULL
- Status status() const { assert(iter_); return iter_->status(); }
- void Next() { assert(iter_); iter_->Next(); Update(); }
- void Prev() { assert(iter_); iter_->Prev(); Update(); }
- void Seek(const Slice& k) { assert(iter_); iter_->Seek(k); Update(); }
- void SeekToFirst() { assert(iter_); iter_->SeekToFirst(); Update(); }
- void SeekToLast() { assert(iter_); iter_->SeekToLast(); Update(); }
+ bool Valid() const { return valid_; }
+ Slice key() const {
+ assert(Valid());
+ return key_;
+ }
+ Slice value() const {
+ assert(Valid());
+ return iter_->value();
+ }
+ // Methods below require iter() != nullptr
+ Status status() const {
+ assert(iter_);
+ return iter_->status();
+ }
+ void Next() {
+ assert(iter_);
+ iter_->Next();
+ Update();
+ }
+ void Prev() {
+ assert(iter_);
+ iter_->Prev();
+ Update();
+ }
+ void Seek(const Slice& k) {
+ assert(iter_);
+ iter_->Seek(k);
+ Update();
+ }
+ void SeekToFirst() {
+ assert(iter_);
+ iter_->SeekToFirst();
+ Update();
+ }
+ void SeekToLast() {
+ assert(iter_);
+ iter_->SeekToLast();
+ Update();
+ }
private:
void Update() {
diff --git a/src/leveldb/table/merger.cc b/src/leveldb/table/merger.cc
index 2dde4dc21f..76441b1cc2 100644
--- a/src/leveldb/table/merger.cc
+++ b/src/leveldb/table/merger.cc
@@ -17,22 +17,18 @@ class MergingIterator : public Iterator {
: comparator_(comparator),
children_(new IteratorWrapper[n]),
n_(n),
- current_(NULL),
+ current_(nullptr),
direction_(kForward) {
for (int i = 0; i < n; i++) {
children_[i].Set(children[i]);
}
}
- virtual ~MergingIterator() {
- delete[] children_;
- }
+ ~MergingIterator() override { delete[] children_; }
- virtual bool Valid() const {
- return (current_ != NULL);
- }
+ bool Valid() const override { return (current_ != nullptr); }
- virtual void SeekToFirst() {
+ void SeekToFirst() override {
for (int i = 0; i < n_; i++) {
children_[i].SeekToFirst();
}
@@ -40,7 +36,7 @@ class MergingIterator : public Iterator {
direction_ = kForward;
}
- virtual void SeekToLast() {
+ void SeekToLast() override {
for (int i = 0; i < n_; i++) {
children_[i].SeekToLast();
}
@@ -48,7 +44,7 @@ class MergingIterator : public Iterator {
direction_ = kReverse;
}
- virtual void Seek(const Slice& target) {
+ void Seek(const Slice& target) override {
for (int i = 0; i < n_; i++) {
children_[i].Seek(target);
}
@@ -56,7 +52,7 @@ class MergingIterator : public Iterator {
direction_ = kForward;
}
- virtual void Next() {
+ void Next() override {
assert(Valid());
// Ensure that all children are positioned after key().
@@ -82,7 +78,7 @@ class MergingIterator : public Iterator {
FindSmallest();
}
- virtual void Prev() {
+ void Prev() override {
assert(Valid());
// Ensure that all children are positioned before key().
@@ -111,17 +107,17 @@ class MergingIterator : public Iterator {
FindLargest();
}
- virtual Slice key() const {
+ Slice key() const override {
assert(Valid());
return current_->key();
}
- virtual Slice value() const {
+ Slice value() const override {
assert(Valid());
return current_->value();
}
- virtual Status status() const {
+ Status status() const override {
Status status;
for (int i = 0; i < n_; i++) {
status = children_[i].status();
@@ -133,6 +129,9 @@ class MergingIterator : public Iterator {
}
private:
+ // Which direction is the iterator moving?
+ enum Direction { kForward, kReverse };
+
void FindSmallest();
void FindLargest();
@@ -143,21 +142,15 @@ class MergingIterator : public Iterator {
IteratorWrapper* children_;
int n_;
IteratorWrapper* current_;
-
- // Which direction is the iterator moving?
- enum Direction {
- kForward,
- kReverse
- };
Direction direction_;
};
void MergingIterator::FindSmallest() {
- IteratorWrapper* smallest = NULL;
+ IteratorWrapper* smallest = nullptr;
for (int i = 0; i < n_; i++) {
IteratorWrapper* child = &children_[i];
if (child->Valid()) {
- if (smallest == NULL) {
+ if (smallest == nullptr) {
smallest = child;
} else if (comparator_->Compare(child->key(), smallest->key()) < 0) {
smallest = child;
@@ -168,11 +161,11 @@ void MergingIterator::FindSmallest() {
}
void MergingIterator::FindLargest() {
- IteratorWrapper* largest = NULL;
- for (int i = n_-1; i >= 0; i--) {
+ IteratorWrapper* largest = nullptr;
+ for (int i = n_ - 1; i >= 0; i--) {
IteratorWrapper* child = &children_[i];
if (child->Valid()) {
- if (largest == NULL) {
+ if (largest == nullptr) {
largest = child;
} else if (comparator_->Compare(child->key(), largest->key()) > 0) {
largest = child;
@@ -183,14 +176,15 @@ void MergingIterator::FindLargest() {
}
} // namespace
-Iterator* NewMergingIterator(const Comparator* cmp, Iterator** list, int n) {
+Iterator* NewMergingIterator(const Comparator* comparator, Iterator** children,
+ int n) {
assert(n >= 0);
if (n == 0) {
return NewEmptyIterator();
} else if (n == 1) {
- return list[0];
+ return children[0];
} else {
- return new MergingIterator(cmp, list, n);
+ return new MergingIterator(comparator, children, n);
}
}
diff --git a/src/leveldb/table/merger.h b/src/leveldb/table/merger.h
index 91ddd80faa..41cedc5254 100644
--- a/src/leveldb/table/merger.h
+++ b/src/leveldb/table/merger.h
@@ -18,8 +18,8 @@ class Iterator;
// key is present in K child iterators, it will be yielded K times.
//
// REQUIRES: n >= 0
-extern Iterator* NewMergingIterator(
- const Comparator* comparator, Iterator** children, int n);
+Iterator* NewMergingIterator(const Comparator* comparator, Iterator** children,
+ int n);
} // namespace leveldb
diff --git a/src/leveldb/table/table.cc b/src/leveldb/table/table.cc
index decf8082cc..b07bc88c7e 100644
--- a/src/leveldb/table/table.cc
+++ b/src/leveldb/table/table.cc
@@ -20,7 +20,7 @@ namespace leveldb {
struct Table::Rep {
~Rep() {
delete filter;
- delete [] filter_data;
+ delete[] filter_data;
delete index_block;
}
@@ -35,11 +35,9 @@ struct Table::Rep {
Block* index_block;
};
-Status Table::Open(const Options& options,
- RandomAccessFile* file,
- uint64_t size,
- Table** table) {
- *table = NULL;
+Status Table::Open(const Options& options, RandomAccessFile* file,
+ uint64_t size, Table** table) {
+ *table = nullptr;
if (size < Footer::kEncodedLength) {
return Status::Corruption("file is too short to be an sstable");
}
@@ -55,41 +53,36 @@ Status Table::Open(const Options& options,
if (!s.ok()) return s;
// Read the index block
- BlockContents contents;
- Block* index_block = NULL;
+ BlockContents index_block_contents;
if (s.ok()) {
ReadOptions opt;
if (options.paranoid_checks) {
opt.verify_checksums = true;
}
- s = ReadBlock(file, opt, footer.index_handle(), &contents);
- if (s.ok()) {
- index_block = new Block(contents);
- }
+ s = ReadBlock(file, opt, footer.index_handle(), &index_block_contents);
}
if (s.ok()) {
// We've successfully read the footer and the index block: we're
// ready to serve requests.
+ Block* index_block = new Block(index_block_contents);
Rep* rep = new Table::Rep;
rep->options = options;
rep->file = file;
rep->metaindex_handle = footer.metaindex_handle();
rep->index_block = index_block;
rep->cache_id = (options.block_cache ? options.block_cache->NewId() : 0);
- rep->filter_data = NULL;
- rep->filter = NULL;
+ rep->filter_data = nullptr;
+ rep->filter = nullptr;
*table = new Table(rep);
(*table)->ReadMeta(footer);
- } else {
- delete index_block;
}
return s;
}
void Table::ReadMeta(const Footer& footer) {
- if (rep_->options.filter_policy == NULL) {
+ if (rep_->options.filter_policy == nullptr) {
return; // Do not need any metadata
}
@@ -135,14 +128,12 @@ void Table::ReadFilter(const Slice& filter_handle_value) {
return;
}
if (block.heap_allocated) {
- rep_->filter_data = block.data.data(); // Will need to delete later
+ rep_->filter_data = block.data.data(); // Will need to delete later
}
rep_->filter = new FilterBlockReader(rep_->options.filter_policy, block.data);
}
-Table::~Table() {
- delete rep_;
-}
+Table::~Table() { delete rep_; }
static void DeleteBlock(void* arg, void* ignored) {
delete reinterpret_cast<Block*>(arg);
@@ -161,13 +152,12 @@ static void ReleaseBlock(void* arg, void* h) {
// Convert an index iterator value (i.e., an encoded BlockHandle)
// into an iterator over the contents of the corresponding block.
-Iterator* Table::BlockReader(void* arg,
- const ReadOptions& options,
+Iterator* Table::BlockReader(void* arg, const ReadOptions& options,
const Slice& index_value) {
Table* table = reinterpret_cast<Table*>(arg);
Cache* block_cache = table->rep_->options.block_cache;
- Block* block = NULL;
- Cache::Handle* cache_handle = NULL;
+ Block* block = nullptr;
+ Cache::Handle* cache_handle = nullptr;
BlockHandle handle;
Slice input = index_value;
@@ -177,21 +167,21 @@ Iterator* Table::BlockReader(void* arg,
if (s.ok()) {
BlockContents contents;
- if (block_cache != NULL) {
+ if (block_cache != nullptr) {
char cache_key_buffer[16];
EncodeFixed64(cache_key_buffer, table->rep_->cache_id);
- EncodeFixed64(cache_key_buffer+8, handle.offset());
+ EncodeFixed64(cache_key_buffer + 8, handle.offset());
Slice key(cache_key_buffer, sizeof(cache_key_buffer));
cache_handle = block_cache->Lookup(key);
- if (cache_handle != NULL) {
+ if (cache_handle != nullptr) {
block = reinterpret_cast<Block*>(block_cache->Value(cache_handle));
} else {
s = ReadBlock(table->rep_->file, options, handle, &contents);
if (s.ok()) {
block = new Block(contents);
if (contents.cachable && options.fill_cache) {
- cache_handle = block_cache->Insert(
- key, block, block->size(), &DeleteCachedBlock);
+ cache_handle = block_cache->Insert(key, block, block->size(),
+ &DeleteCachedBlock);
}
}
}
@@ -204,10 +194,10 @@ Iterator* Table::BlockReader(void* arg,
}
Iterator* iter;
- if (block != NULL) {
+ if (block != nullptr) {
iter = block->NewIterator(table->rep_->options.comparator);
- if (cache_handle == NULL) {
- iter->RegisterCleanup(&DeleteBlock, block, NULL);
+ if (cache_handle == nullptr) {
+ iter->RegisterCleanup(&DeleteBlock, block, nullptr);
} else {
iter->RegisterCleanup(&ReleaseBlock, block_cache, cache_handle);
}
@@ -223,9 +213,9 @@ Iterator* Table::NewIterator(const ReadOptions& options) const {
&Table::BlockReader, const_cast<Table*>(this), options);
}
-Status Table::InternalGet(const ReadOptions& options, const Slice& k,
- void* arg,
- void (*saver)(void*, const Slice&, const Slice&)) {
+Status Table::InternalGet(const ReadOptions& options, const Slice& k, void* arg,
+ void (*handle_result)(void*, const Slice&,
+ const Slice&)) {
Status s;
Iterator* iiter = rep_->index_block->NewIterator(rep_->options.comparator);
iiter->Seek(k);
@@ -233,15 +223,14 @@ Status Table::InternalGet(const ReadOptions& options, const Slice& k,
Slice handle_value = iiter->value();
FilterBlockReader* filter = rep_->filter;
BlockHandle handle;
- if (filter != NULL &&
- handle.DecodeFrom(&handle_value).ok() &&
+ if (filter != nullptr && handle.DecodeFrom(&handle_value).ok() &&
!filter->KeyMayMatch(handle.offset(), k)) {
// Not found
} else {
Iterator* block_iter = BlockReader(this, options, iiter->value());
block_iter->Seek(k);
if (block_iter->Valid()) {
- (*saver)(arg, block_iter->key(), block_iter->value());
+ (*handle_result)(arg, block_iter->key(), block_iter->value());
}
s = block_iter->status();
delete block_iter;
@@ -254,7 +243,6 @@ Status Table::InternalGet(const ReadOptions& options, const Slice& k,
return s;
}
-
uint64_t Table::ApproximateOffsetOf(const Slice& key) const {
Iterator* index_iter =
rep_->index_block->NewIterator(rep_->options.comparator);
diff --git a/src/leveldb/table/table_builder.cc b/src/leveldb/table/table_builder.cc
index 62002c84f2..278febf94f 100644
--- a/src/leveldb/table/table_builder.cc
+++ b/src/leveldb/table/table_builder.cc
@@ -5,6 +5,7 @@
#include "leveldb/table_builder.h"
#include <assert.h>
+
#include "leveldb/comparator.h"
#include "leveldb/env.h"
#include "leveldb/filter_policy.h"
@@ -18,6 +19,22 @@
namespace leveldb {
struct TableBuilder::Rep {
+ Rep(const Options& opt, WritableFile* f)
+ : options(opt),
+ index_block_options(opt),
+ file(f),
+ offset(0),
+ data_block(&options),
+ index_block(&index_block_options),
+ num_entries(0),
+ closed(false),
+ filter_block(opt.filter_policy == nullptr
+ ? nullptr
+ : new FilterBlockBuilder(opt.filter_policy)),
+ pending_index_entry(false) {
+ index_block_options.block_restart_interval = 1;
+ }
+
Options options;
Options index_block_options;
WritableFile* file;
@@ -27,7 +44,7 @@ struct TableBuilder::Rep {
BlockBuilder index_block;
std::string last_key;
int64_t num_entries;
- bool closed; // Either Finish() or Abandon() has been called.
+ bool closed; // Either Finish() or Abandon() has been called.
FilterBlockBuilder* filter_block;
// We do not emit the index entry for a block until we have seen the
@@ -43,26 +60,11 @@ struct TableBuilder::Rep {
BlockHandle pending_handle; // Handle to add to index block
std::string compressed_output;
-
- Rep(const Options& opt, WritableFile* f)
- : options(opt),
- index_block_options(opt),
- file(f),
- offset(0),
- data_block(&options),
- index_block(&index_block_options),
- num_entries(0),
- closed(false),
- filter_block(opt.filter_policy == NULL ? NULL
- : new FilterBlockBuilder(opt.filter_policy)),
- pending_index_entry(false) {
- index_block_options.block_restart_interval = 1;
- }
};
TableBuilder::TableBuilder(const Options& options, WritableFile* file)
: rep_(new Rep(options, file)) {
- if (rep_->filter_block != NULL) {
+ if (rep_->filter_block != nullptr) {
rep_->filter_block->StartBlock(0);
}
}
@@ -106,7 +108,7 @@ void TableBuilder::Add(const Slice& key, const Slice& value) {
r->pending_index_entry = false;
}
- if (r->filter_block != NULL) {
+ if (r->filter_block != nullptr) {
r->filter_block->AddKey(key);
}
@@ -131,7 +133,7 @@ void TableBuilder::Flush() {
r->pending_index_entry = true;
r->status = r->file->Flush();
}
- if (r->filter_block != NULL) {
+ if (r->filter_block != nullptr) {
r->filter_block->StartBlock(r->offset);
}
}
@@ -173,8 +175,7 @@ void TableBuilder::WriteBlock(BlockBuilder* block, BlockHandle* handle) {
}
void TableBuilder::WriteRawBlock(const Slice& block_contents,
- CompressionType type,
- BlockHandle* handle) {
+ CompressionType type, BlockHandle* handle) {
Rep* r = rep_;
handle->set_offset(r->offset);
handle->set_size(block_contents.size());
@@ -184,7 +185,7 @@ void TableBuilder::WriteRawBlock(const Slice& block_contents,
trailer[0] = type;
uint32_t crc = crc32c::Value(block_contents.data(), block_contents.size());
crc = crc32c::Extend(crc, trailer, 1); // Extend crc to cover block type
- EncodeFixed32(trailer+1, crc32c::Mask(crc));
+ EncodeFixed32(trailer + 1, crc32c::Mask(crc));
r->status = r->file->Append(Slice(trailer, kBlockTrailerSize));
if (r->status.ok()) {
r->offset += block_contents.size() + kBlockTrailerSize;
@@ -192,9 +193,7 @@ void TableBuilder::WriteRawBlock(const Slice& block_contents,
}
}
-Status TableBuilder::status() const {
- return rep_->status;
-}
+Status TableBuilder::status() const { return rep_->status; }
Status TableBuilder::Finish() {
Rep* r = rep_;
@@ -205,7 +204,7 @@ Status TableBuilder::Finish() {
BlockHandle filter_block_handle, metaindex_block_handle, index_block_handle;
// Write filter block
- if (ok() && r->filter_block != NULL) {
+ if (ok() && r->filter_block != nullptr) {
WriteRawBlock(r->filter_block->Finish(), kNoCompression,
&filter_block_handle);
}
@@ -213,7 +212,7 @@ Status TableBuilder::Finish() {
// Write metaindex block
if (ok()) {
BlockBuilder meta_index_block(&r->options);
- if (r->filter_block != NULL) {
+ if (r->filter_block != nullptr) {
// Add mapping from "filter.Name" to location of filter data
std::string key = "filter.";
key.append(r->options.filter_policy->Name());
@@ -259,12 +258,8 @@ void TableBuilder::Abandon() {
r->closed = true;
}
-uint64_t TableBuilder::NumEntries() const {
- return rep_->num_entries;
-}
+uint64_t TableBuilder::NumEntries() const { return rep_->num_entries; }
-uint64_t TableBuilder::FileSize() const {
- return rep_->offset;
-}
+uint64_t TableBuilder::FileSize() const { return rep_->offset; }
} // namespace leveldb
diff --git a/src/leveldb/table/table_test.cc b/src/leveldb/table/table_test.cc
index abf6e246ff..17aaea2f9e 100644
--- a/src/leveldb/table/table_test.cc
+++ b/src/leveldb/table/table_test.cc
@@ -6,6 +6,7 @@
#include <map>
#include <string>
+
#include "db/dbformat.h"
#include "db/memtable.h"
#include "db/write_batch_internal.h"
@@ -27,8 +28,8 @@ namespace leveldb {
static std::string Reverse(const Slice& key) {
std::string str(key.ToString());
std::string rev("");
- for (std::string::reverse_iterator rit = str.rbegin();
- rit != str.rend(); ++rit) {
+ for (std::string::reverse_iterator rit = str.rbegin(); rit != str.rend();
+ ++rit) {
rev.push_back(*rit);
}
return rev;
@@ -37,24 +38,23 @@ static std::string Reverse(const Slice& key) {
namespace {
class ReverseKeyComparator : public Comparator {
public:
- virtual const char* Name() const {
+ const char* Name() const override {
return "leveldb.ReverseBytewiseComparator";
}
- virtual int Compare(const Slice& a, const Slice& b) const {
+ int Compare(const Slice& a, const Slice& b) const override {
return BytewiseComparator()->Compare(Reverse(a), Reverse(b));
}
- virtual void FindShortestSeparator(
- std::string* start,
- const Slice& limit) const {
+ void FindShortestSeparator(std::string* start,
+ const Slice& limit) const override {
std::string s = Reverse(*start);
std::string l = Reverse(limit);
BytewiseComparator()->FindShortestSeparator(&s, l);
*start = Reverse(s);
}
- virtual void FindShortSuccessor(std::string* key) const {
+ void FindShortSuccessor(std::string* key) const override {
std::string s = Reverse(*key);
BytewiseComparator()->FindShortSuccessor(&s);
*key = Reverse(s);
@@ -79,47 +79,46 @@ namespace {
struct STLLessThan {
const Comparator* cmp;
- STLLessThan() : cmp(BytewiseComparator()) { }
- STLLessThan(const Comparator* c) : cmp(c) { }
+ STLLessThan() : cmp(BytewiseComparator()) {}
+ STLLessThan(const Comparator* c) : cmp(c) {}
bool operator()(const std::string& a, const std::string& b) const {
return cmp->Compare(Slice(a), Slice(b)) < 0;
}
};
} // namespace
-class StringSink: public WritableFile {
+class StringSink : public WritableFile {
public:
- ~StringSink() { }
+ ~StringSink() override = default;
const std::string& contents() const { return contents_; }
- virtual Status Close() { return Status::OK(); }
- virtual Status Flush() { return Status::OK(); }
- virtual Status Sync() { return Status::OK(); }
+ Status Close() override { return Status::OK(); }
+ Status Flush() override { return Status::OK(); }
+ Status Sync() override { return Status::OK(); }
- virtual Status Append(const Slice& data) {
+ Status Append(const Slice& data) override {
contents_.append(data.data(), data.size());
return Status::OK();
}
+ std::string GetName() const override { return ""; }
private:
std::string contents_;
};
-
-class StringSource: public RandomAccessFile {
+class StringSource : public RandomAccessFile {
public:
StringSource(const Slice& contents)
- : contents_(contents.data(), contents.size()) {
- }
+ : contents_(contents.data(), contents.size()) {}
- virtual ~StringSource() { }
+ ~StringSource() override = default;
uint64_t Size() const { return contents_.size(); }
- virtual Status Read(uint64_t offset, size_t n, Slice* result,
- char* scratch) const {
- if (offset > contents_.size()) {
+ Status Read(uint64_t offset, size_t n, Slice* result,
+ char* scratch) const override {
+ if (offset >= contents_.size()) {
return Status::InvalidArgument("invalid Read offset");
}
if (offset + n > contents_.size()) {
@@ -130,6 +129,7 @@ class StringSource: public RandomAccessFile {
return Status::OK();
}
+ std::string GetName() const { return ""; }
private:
std::string contents_;
};
@@ -140,8 +140,8 @@ typedef std::map<std::string, std::string, STLLessThan> KVMap;
// BlockBuilder/TableBuilder and Block/Table.
class Constructor {
public:
- explicit Constructor(const Comparator* cmp) : data_(STLLessThan(cmp)) { }
- virtual ~Constructor() { }
+ explicit Constructor(const Comparator* cmp) : data_(STLLessThan(cmp)) {}
+ virtual ~Constructor() = default;
void Add(const std::string& key, const Slice& value) {
data_[key] = value.ToString();
@@ -150,15 +150,12 @@ class Constructor {
// Finish constructing the data structure with all the keys that have
// been added so far. Returns the keys in sorted order in "*keys"
// and stores the key/value pairs in "*kvmap"
- void Finish(const Options& options,
- std::vector<std::string>* keys,
+ void Finish(const Options& options, std::vector<std::string>* keys,
KVMap* kvmap) {
*kvmap = data_;
keys->clear();
- for (KVMap::const_iterator it = data_.begin();
- it != data_.end();
- ++it) {
- keys->push_back(it->first);
+ for (const auto& kvp : data_) {
+ keys->push_back(kvp.first);
}
data_.clear();
Status s = FinishImpl(options, *kvmap);
@@ -170,32 +167,26 @@ class Constructor {
virtual Iterator* NewIterator() const = 0;
- virtual const KVMap& data() { return data_; }
+ const KVMap& data() const { return data_; }
- virtual DB* db() const { return NULL; } // Overridden in DBConstructor
+ virtual DB* db() const { return nullptr; } // Overridden in DBConstructor
private:
KVMap data_;
};
-class BlockConstructor: public Constructor {
+class BlockConstructor : public Constructor {
public:
explicit BlockConstructor(const Comparator* cmp)
- : Constructor(cmp),
- comparator_(cmp),
- block_(NULL) { }
- ~BlockConstructor() {
+ : Constructor(cmp), comparator_(cmp), block_(nullptr) {}
+ ~BlockConstructor() override { delete block_; }
+ Status FinishImpl(const Options& options, const KVMap& data) override {
delete block_;
- }
- virtual Status FinishImpl(const Options& options, const KVMap& data) {
- delete block_;
- block_ = NULL;
+ block_ = nullptr;
BlockBuilder builder(&options);
- for (KVMap::const_iterator it = data.begin();
- it != data.end();
- ++it) {
- builder.Add(it->first, it->second);
+ for (const auto& kvp : data) {
+ builder.Add(kvp.first, kvp.second);
}
// Open the block
data_ = builder.Finish().ToString();
@@ -206,36 +197,30 @@ class BlockConstructor: public Constructor {
block_ = new Block(contents);
return Status::OK();
}
- virtual Iterator* NewIterator() const {
+ Iterator* NewIterator() const override {
return block_->NewIterator(comparator_);
}
private:
- const Comparator* comparator_;
+ const Comparator* const comparator_;
std::string data_;
Block* block_;
BlockConstructor();
};
-class TableConstructor: public Constructor {
+class TableConstructor : public Constructor {
public:
TableConstructor(const Comparator* cmp)
- : Constructor(cmp),
- source_(NULL), table_(NULL) {
- }
- ~TableConstructor() {
- Reset();
- }
- virtual Status FinishImpl(const Options& options, const KVMap& data) {
+ : Constructor(cmp), source_(nullptr), table_(nullptr) {}
+ ~TableConstructor() override { Reset(); }
+ Status FinishImpl(const Options& options, const KVMap& data) override {
Reset();
StringSink sink;
TableBuilder builder(options, &sink);
- for (KVMap::const_iterator it = data.begin();
- it != data.end();
- ++it) {
- builder.Add(it->first, it->second);
+ for (const auto& kvp : data) {
+ builder.Add(kvp.first, kvp.second);
ASSERT_TRUE(builder.status().ok());
}
Status s = builder.Finish();
@@ -250,7 +235,7 @@ class TableConstructor: public Constructor {
return Table::Open(table_options, source_, sink.contents().size(), &table_);
}
- virtual Iterator* NewIterator() const {
+ Iterator* NewIterator() const override {
return table_->NewIterator(ReadOptions());
}
@@ -262,8 +247,8 @@ class TableConstructor: public Constructor {
void Reset() {
delete table_;
delete source_;
- table_ = NULL;
- source_ = NULL;
+ table_ = nullptr;
+ source_ = nullptr;
}
StringSource* source_;
@@ -273,23 +258,28 @@ class TableConstructor: public Constructor {
};
// A helper class that converts internal format keys into user keys
-class KeyConvertingIterator: public Iterator {
+class KeyConvertingIterator : public Iterator {
public:
- explicit KeyConvertingIterator(Iterator* iter) : iter_(iter) { }
- virtual ~KeyConvertingIterator() { delete iter_; }
- virtual bool Valid() const { return iter_->Valid(); }
- virtual void Seek(const Slice& target) {
+ explicit KeyConvertingIterator(Iterator* iter) : iter_(iter) {}
+
+ KeyConvertingIterator(const KeyConvertingIterator&) = delete;
+ KeyConvertingIterator& operator=(const KeyConvertingIterator&) = delete;
+
+ ~KeyConvertingIterator() override { delete iter_; }
+
+ bool Valid() const override { return iter_->Valid(); }
+ void Seek(const Slice& target) override {
ParsedInternalKey ikey(target, kMaxSequenceNumber, kTypeValue);
std::string encoded;
AppendInternalKey(&encoded, ikey);
iter_->Seek(encoded);
}
- virtual void SeekToFirst() { iter_->SeekToFirst(); }
- virtual void SeekToLast() { iter_->SeekToLast(); }
- virtual void Next() { iter_->Next(); }
- virtual void Prev() { iter_->Prev(); }
+ void SeekToFirst() override { iter_->SeekToFirst(); }
+ void SeekToLast() override { iter_->SeekToLast(); }
+ void Next() override { iter_->Next(); }
+ void Prev() override { iter_->Prev(); }
- virtual Slice key() const {
+ Slice key() const override {
assert(Valid());
ParsedInternalKey key;
if (!ParseInternalKey(iter_->key(), &key)) {
@@ -299,82 +289,68 @@ class KeyConvertingIterator: public Iterator {
return key.user_key;
}
- virtual Slice value() const { return iter_->value(); }
- virtual Status status() const {
+ Slice value() const override { return iter_->value(); }
+ Status status() const override {
return status_.ok() ? iter_->status() : status_;
}
private:
mutable Status status_;
Iterator* iter_;
-
- // No copying allowed
- KeyConvertingIterator(const KeyConvertingIterator&);
- void operator=(const KeyConvertingIterator&);
};
-class MemTableConstructor: public Constructor {
+class MemTableConstructor : public Constructor {
public:
explicit MemTableConstructor(const Comparator* cmp)
- : Constructor(cmp),
- internal_comparator_(cmp) {
+ : Constructor(cmp), internal_comparator_(cmp) {
memtable_ = new MemTable(internal_comparator_);
memtable_->Ref();
}
- ~MemTableConstructor() {
- memtable_->Unref();
- }
- virtual Status FinishImpl(const Options& options, const KVMap& data) {
+ ~MemTableConstructor() override { memtable_->Unref(); }
+ Status FinishImpl(const Options& options, const KVMap& data) override {
memtable_->Unref();
memtable_ = new MemTable(internal_comparator_);
memtable_->Ref();
int seq = 1;
- for (KVMap::const_iterator it = data.begin();
- it != data.end();
- ++it) {
- memtable_->Add(seq, kTypeValue, it->first, it->second);
+ for (const auto& kvp : data) {
+ memtable_->Add(seq, kTypeValue, kvp.first, kvp.second);
seq++;
}
return Status::OK();
}
- virtual Iterator* NewIterator() const {
+ Iterator* NewIterator() const override {
return new KeyConvertingIterator(memtable_->NewIterator());
}
private:
- InternalKeyComparator internal_comparator_;
+ const InternalKeyComparator internal_comparator_;
MemTable* memtable_;
};
-class DBConstructor: public Constructor {
+class DBConstructor : public Constructor {
public:
explicit DBConstructor(const Comparator* cmp)
- : Constructor(cmp),
- comparator_(cmp) {
- db_ = NULL;
+ : Constructor(cmp), comparator_(cmp) {
+ db_ = nullptr;
NewDB();
}
- ~DBConstructor() {
- delete db_;
- }
- virtual Status FinishImpl(const Options& options, const KVMap& data) {
+ ~DBConstructor() override { delete db_; }
+ Status FinishImpl(const Options& options, const KVMap& data) override {
delete db_;
- db_ = NULL;
+ db_ = nullptr;
NewDB();
- for (KVMap::const_iterator it = data.begin();
- it != data.end();
- ++it) {
+ for (const auto& kvp : data) {
WriteBatch batch;
- batch.Put(it->first, it->second);
+ batch.Put(kvp.first, kvp.second);
ASSERT_TRUE(db_->Write(WriteOptions(), &batch).ok());
}
return Status::OK();
}
- virtual Iterator* NewIterator() const {
+ Iterator* NewIterator() const override {
return db_->NewIterator(ReadOptions());
}
- virtual DB* db() const { return db_; }
+ DB* db() const override { return db_; }
private:
void NewDB() {
@@ -392,16 +368,11 @@ class DBConstructor: public Constructor {
ASSERT_TRUE(status.ok()) << status.ToString();
}
- const Comparator* comparator_;
+ const Comparator* const comparator_;
DB* db_;
};
-enum TestType {
- TABLE_TEST,
- BLOCK_TEST,
- MEMTABLE_TEST,
- DB_TEST
-};
+enum TestType { TABLE_TEST, BLOCK_TEST, MEMTABLE_TEST, DB_TEST };
struct TestArgs {
TestType type;
@@ -410,37 +381,37 @@ struct TestArgs {
};
static const TestArgs kTestArgList[] = {
- { TABLE_TEST, false, 16 },
- { TABLE_TEST, false, 1 },
- { TABLE_TEST, false, 1024 },
- { TABLE_TEST, true, 16 },
- { TABLE_TEST, true, 1 },
- { TABLE_TEST, true, 1024 },
-
- { BLOCK_TEST, false, 16 },
- { BLOCK_TEST, false, 1 },
- { BLOCK_TEST, false, 1024 },
- { BLOCK_TEST, true, 16 },
- { BLOCK_TEST, true, 1 },
- { BLOCK_TEST, true, 1024 },
-
- // Restart interval does not matter for memtables
- { MEMTABLE_TEST, false, 16 },
- { MEMTABLE_TEST, true, 16 },
-
- // Do not bother with restart interval variations for DB
- { DB_TEST, false, 16 },
- { DB_TEST, true, 16 },
+ {TABLE_TEST, false, 16},
+ {TABLE_TEST, false, 1},
+ {TABLE_TEST, false, 1024},
+ {TABLE_TEST, true, 16},
+ {TABLE_TEST, true, 1},
+ {TABLE_TEST, true, 1024},
+
+ {BLOCK_TEST, false, 16},
+ {BLOCK_TEST, false, 1},
+ {BLOCK_TEST, false, 1024},
+ {BLOCK_TEST, true, 16},
+ {BLOCK_TEST, true, 1},
+ {BLOCK_TEST, true, 1024},
+
+ // Restart interval does not matter for memtables
+ {MEMTABLE_TEST, false, 16},
+ {MEMTABLE_TEST, true, 16},
+
+ // Do not bother with restart interval variations for DB
+ {DB_TEST, false, 16},
+ {DB_TEST, true, 16},
};
static const int kNumTestArgs = sizeof(kTestArgList) / sizeof(kTestArgList[0]);
class Harness {
public:
- Harness() : constructor_(NULL) { }
+ Harness() : constructor_(nullptr) {}
void Init(const TestArgs& args) {
delete constructor_;
- constructor_ = NULL;
+ constructor_ = nullptr;
options_ = Options();
options_.block_restart_interval = args.restart_interval;
@@ -466,9 +437,7 @@ class Harness {
}
}
- ~Harness() {
- delete constructor_;
- }
+ ~Harness() { delete constructor_; }
void Add(const std::string& key, const std::string& value) {
constructor_->Add(key, value);
@@ -490,8 +459,7 @@ class Harness {
ASSERT_TRUE(!iter->Valid());
iter->SeekToFirst();
for (KVMap::const_iterator model_iter = data.begin();
- model_iter != data.end();
- ++model_iter) {
+ model_iter != data.end(); ++model_iter) {
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
iter->Next();
}
@@ -505,8 +473,7 @@ class Harness {
ASSERT_TRUE(!iter->Valid());
iter->SeekToLast();
for (KVMap::const_reverse_iterator model_iter = data.rbegin();
- model_iter != data.rend();
- ++model_iter) {
+ model_iter != data.rend(); ++model_iter) {
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
iter->Prev();
}
@@ -514,8 +481,7 @@ class Harness {
delete iter;
}
- void TestRandomAccess(Random* rnd,
- const std::vector<std::string>& keys,
+ void TestRandomAccess(Random* rnd, const std::vector<std::string>& keys,
const KVMap& data) {
static const bool kVerbose = false;
Iterator* iter = constructor_->NewIterator();
@@ -546,8 +512,8 @@ class Harness {
case 2: {
std::string key = PickRandomKey(rnd, keys);
model_iter = data.lower_bound(key);
- if (kVerbose) fprintf(stderr, "Seek '%s'\n",
- EscapeString(key).c_str());
+ if (kVerbose)
+ fprintf(stderr, "Seek '%s'\n", EscapeString(key).c_str());
iter->Seek(Slice(key));
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
break;
@@ -558,7 +524,7 @@ class Harness {
if (kVerbose) fprintf(stderr, "Prev\n");
iter->Prev();
if (model_iter == data.begin()) {
- model_iter = data.end(); // Wrap around to invalid value
+ model_iter = data.end(); // Wrap around to invalid value
} else {
--model_iter;
}
@@ -621,8 +587,8 @@ class Harness {
break;
case 1: {
// Attempt to return something smaller than an existing key
- if (result.size() > 0 && result[result.size()-1] > '\0') {
- result[result.size()-1]--;
+ if (!result.empty() && result[result.size() - 1] > '\0') {
+ result[result.size() - 1]--;
}
break;
}
@@ -636,7 +602,7 @@ class Harness {
}
}
- // Returns NULL if not running against a DB
+ // Returns nullptr if not running against a DB
DB* db() const { return constructor_->db(); }
private:
@@ -720,8 +686,8 @@ TEST(Harness, Randomized) {
for (int num_entries = 0; num_entries < 2000;
num_entries += (num_entries < 50 ? 1 : 200)) {
if ((num_entries % 10) == 0) {
- fprintf(stderr, "case %d of %d: num_entries = %d\n",
- (i + 1), int(kNumTestArgs), num_entries);
+ fprintf(stderr, "case %d of %d: num_entries = %d\n", (i + 1),
+ int(kNumTestArgs), num_entries);
}
for (int e = 0; e < num_entries; e++) {
std::string v;
@@ -735,7 +701,7 @@ TEST(Harness, Randomized) {
TEST(Harness, RandomizedLongDB) {
Random rnd(test::RandomSeed());
- TestArgs args = { DB_TEST, false, 16 };
+ TestArgs args = {DB_TEST, false, 16};
Init(args);
int num_entries = 100000;
for (int e = 0; e < num_entries; e++) {
@@ -757,7 +723,7 @@ TEST(Harness, RandomizedLongDB) {
ASSERT_GT(files, 0);
}
-class MemTableTest { };
+class MemTableTest {};
TEST(MemTableTest, Simple) {
InternalKeyComparator cmp(BytewiseComparator());
@@ -774,8 +740,7 @@ TEST(MemTableTest, Simple) {
Iterator* iter = memtable->NewIterator();
iter->SeekToFirst();
while (iter->Valid()) {
- fprintf(stderr, "key: '%s' -> '%s'\n",
- iter->key().ToString().c_str(),
+ fprintf(stderr, "key: '%s' -> '%s'\n", iter->key().ToString().c_str(),
iter->value().ToString().c_str());
iter->Next();
}
@@ -788,14 +753,13 @@ static bool Between(uint64_t val, uint64_t low, uint64_t high) {
bool result = (val >= low) && (val <= high);
if (!result) {
fprintf(stderr, "Value %llu is not in range [%llu, %llu]\n",
- (unsigned long long)(val),
- (unsigned long long)(low),
+ (unsigned long long)(val), (unsigned long long)(low),
(unsigned long long)(high));
}
return result;
}
-class TableTest { };
+class TableTest {};
TEST(TableTest, ApproximateOffsetOfPlain) {
TableConstructor c(BytewiseComparator());
@@ -813,18 +777,17 @@ TEST(TableTest, ApproximateOffsetOfPlain) {
options.compression = kNoCompression;
c.Finish(options, &keys, &kvmap);
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, 0));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, 0));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01a"), 0, 0));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, 0));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), 0, 0));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), 10000, 11000));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, 0));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, 0));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01a"), 0, 0));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, 0));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), 0, 0));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), 10000, 11000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04a"), 210000, 211000));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k05"), 210000, 211000));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k06"), 510000, 511000));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("k07"), 510000, 511000));
- ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 610000, 612000));
-
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k05"), 210000, 211000));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k06"), 510000, 511000));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("k07"), 510000, 511000));
+ ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 610000, 612000));
}
static bool SnappyCompressionSupported() {
@@ -855,7 +818,7 @@ TEST(TableTest, ApproximateOffsetOfCompressed) {
// Expected upper and lower bounds of space used by compressible strings.
static const int kSlop = 1000; // Compressor effectiveness varies.
- const int expected = 2500; // 10000 * compression ratio (0.25)
+ const int expected = 2500; // 10000 * compression ratio (0.25)
const int min_z = expected - kSlop;
const int max_z = expected + kSlop;
@@ -871,6 +834,4 @@ TEST(TableTest, ApproximateOffsetOfCompressed) {
} // namespace leveldb
-int main(int argc, char** argv) {
- return leveldb::test::RunAllTests();
-}
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
diff --git a/src/leveldb/table/two_level_iterator.cc b/src/leveldb/table/two_level_iterator.cc
index 7822ebab9c..144790dd97 100644
--- a/src/leveldb/table/two_level_iterator.cc
+++ b/src/leveldb/table/two_level_iterator.cc
@@ -15,38 +15,33 @@ namespace {
typedef Iterator* (*BlockFunction)(void*, const ReadOptions&, const Slice&);
-class TwoLevelIterator: public Iterator {
+class TwoLevelIterator : public Iterator {
public:
- TwoLevelIterator(
- Iterator* index_iter,
- BlockFunction block_function,
- void* arg,
- const ReadOptions& options);
-
- virtual ~TwoLevelIterator();
-
- virtual void Seek(const Slice& target);
- virtual void SeekToFirst();
- virtual void SeekToLast();
- virtual void Next();
- virtual void Prev();
-
- virtual bool Valid() const {
- return data_iter_.Valid();
- }
- virtual Slice key() const {
+ TwoLevelIterator(Iterator* index_iter, BlockFunction block_function,
+ void* arg, const ReadOptions& options);
+
+ ~TwoLevelIterator() override;
+
+ void Seek(const Slice& target) override;
+ void SeekToFirst() override;
+ void SeekToLast() override;
+ void Next() override;
+ void Prev() override;
+
+ bool Valid() const override { return data_iter_.Valid(); }
+ Slice key() const override {
assert(Valid());
return data_iter_.key();
}
- virtual Slice value() const {
+ Slice value() const override {
assert(Valid());
return data_iter_.value();
}
- virtual Status status() const {
+ Status status() const override {
// It'd be nice if status() returned a const Status& instead of a Status
if (!index_iter_.status().ok()) {
return index_iter_.status();
- } else if (data_iter_.iter() != NULL && !data_iter_.status().ok()) {
+ } else if (data_iter_.iter() != nullptr && !data_iter_.status().ok()) {
return data_iter_.status();
} else {
return status_;
@@ -67,45 +62,41 @@ class TwoLevelIterator: public Iterator {
const ReadOptions options_;
Status status_;
IteratorWrapper index_iter_;
- IteratorWrapper data_iter_; // May be NULL
- // If data_iter_ is non-NULL, then "data_block_handle_" holds the
+ IteratorWrapper data_iter_; // May be nullptr
+ // If data_iter_ is non-null, then "data_block_handle_" holds the
// "index_value" passed to block_function_ to create the data_iter_.
std::string data_block_handle_;
};
-TwoLevelIterator::TwoLevelIterator(
- Iterator* index_iter,
- BlockFunction block_function,
- void* arg,
- const ReadOptions& options)
+TwoLevelIterator::TwoLevelIterator(Iterator* index_iter,
+ BlockFunction block_function, void* arg,
+ const ReadOptions& options)
: block_function_(block_function),
arg_(arg),
options_(options),
index_iter_(index_iter),
- data_iter_(NULL) {
-}
+ data_iter_(nullptr) {}
-TwoLevelIterator::~TwoLevelIterator() {
-}
+TwoLevelIterator::~TwoLevelIterator() = default;
void TwoLevelIterator::Seek(const Slice& target) {
index_iter_.Seek(target);
InitDataBlock();
- if (data_iter_.iter() != NULL) data_iter_.Seek(target);
+ if (data_iter_.iter() != nullptr) data_iter_.Seek(target);
SkipEmptyDataBlocksForward();
}
void TwoLevelIterator::SeekToFirst() {
index_iter_.SeekToFirst();
InitDataBlock();
- if (data_iter_.iter() != NULL) data_iter_.SeekToFirst();
+ if (data_iter_.iter() != nullptr) data_iter_.SeekToFirst();
SkipEmptyDataBlocksForward();
}
void TwoLevelIterator::SeekToLast() {
index_iter_.SeekToLast();
InitDataBlock();
- if (data_iter_.iter() != NULL) data_iter_.SeekToLast();
+ if (data_iter_.iter() != nullptr) data_iter_.SeekToLast();
SkipEmptyDataBlocksBackward();
}
@@ -121,44 +112,44 @@ void TwoLevelIterator::Prev() {
SkipEmptyDataBlocksBackward();
}
-
void TwoLevelIterator::SkipEmptyDataBlocksForward() {
- while (data_iter_.iter() == NULL || !data_iter_.Valid()) {
+ while (data_iter_.iter() == nullptr || !data_iter_.Valid()) {
// Move to next block
if (!index_iter_.Valid()) {
- SetDataIterator(NULL);
+ SetDataIterator(nullptr);
return;
}
index_iter_.Next();
InitDataBlock();
- if (data_iter_.iter() != NULL) data_iter_.SeekToFirst();
+ if (data_iter_.iter() != nullptr) data_iter_.SeekToFirst();
}
}
void TwoLevelIterator::SkipEmptyDataBlocksBackward() {
- while (data_iter_.iter() == NULL || !data_iter_.Valid()) {
+ while (data_iter_.iter() == nullptr || !data_iter_.Valid()) {
// Move to next block
if (!index_iter_.Valid()) {
- SetDataIterator(NULL);
+ SetDataIterator(nullptr);
return;
}
index_iter_.Prev();
InitDataBlock();
- if (data_iter_.iter() != NULL) data_iter_.SeekToLast();
+ if (data_iter_.iter() != nullptr) data_iter_.SeekToLast();
}
}
void TwoLevelIterator::SetDataIterator(Iterator* data_iter) {
- if (data_iter_.iter() != NULL) SaveError(data_iter_.status());
+ if (data_iter_.iter() != nullptr) SaveError(data_iter_.status());
data_iter_.Set(data_iter);
}
void TwoLevelIterator::InitDataBlock() {
if (!index_iter_.Valid()) {
- SetDataIterator(NULL);
+ SetDataIterator(nullptr);
} else {
Slice handle = index_iter_.value();
- if (data_iter_.iter() != NULL && handle.compare(data_block_handle_) == 0) {
+ if (data_iter_.iter() != nullptr &&
+ handle.compare(data_block_handle_) == 0) {
// data_iter_ is already constructed with this iterator, so
// no need to change anything
} else {
@@ -171,11 +162,9 @@ void TwoLevelIterator::InitDataBlock() {
} // namespace
-Iterator* NewTwoLevelIterator(
- Iterator* index_iter,
- BlockFunction block_function,
- void* arg,
- const ReadOptions& options) {
+Iterator* NewTwoLevelIterator(Iterator* index_iter,
+ BlockFunction block_function, void* arg,
+ const ReadOptions& options) {
return new TwoLevelIterator(index_iter, block_function, arg, options);
}
diff --git a/src/leveldb/table/two_level_iterator.h b/src/leveldb/table/two_level_iterator.h
index 629ca34525..81ffe809ac 100644
--- a/src/leveldb/table/two_level_iterator.h
+++ b/src/leveldb/table/two_level_iterator.h
@@ -20,14 +20,11 @@ struct ReadOptions;
//
// Uses a supplied function to convert an index_iter value into
// an iterator over the contents of the corresponding block.
-extern Iterator* NewTwoLevelIterator(
+Iterator* NewTwoLevelIterator(
Iterator* index_iter,
- Iterator* (*block_function)(
- void* arg,
- const ReadOptions& options,
- const Slice& index_value),
- void* arg,
- const ReadOptions& options);
+ Iterator* (*block_function)(void* arg, const ReadOptions& options,
+ const Slice& index_value),
+ void* arg, const ReadOptions& options);
} // namespace leveldb
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-09 14:51:15 +0000