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// Copyright (c) 2018 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "leveldb/env.h"
#include "port/port.h"
#include "util/env_windows_test_helper.h"
#include "util/testharness.h"
namespace leveldb {
static const int kMMapLimit = 4;
class EnvWindowsTest {
public:
static void SetFileLimits(int mmap_limit) {
EnvWindowsTestHelper::SetReadOnlyMMapLimit(mmap_limit);
}
EnvWindowsTest() : env_(Env::Default()) {}
Env* env_;
};
TEST(EnvWindowsTest, TestOpenOnRead) {
// Write some test data to a single file that will be opened |n| times.
std::string test_dir;
ASSERT_OK(env_->GetTestDirectory(&test_dir));
std::string test_file = test_dir + "/open_on_read.txt";
FILE* f = fopen(test_file.c_str(), "w");
ASSERT_TRUE(f != nullptr);
const char kFileData[] = "abcdefghijklmnopqrstuvwxyz";
fputs(kFileData, f);
fclose(f);
// Open test file some number above the sum of the two limits to force
// leveldb::WindowsEnv to switch from mapping the file into memory
// to basic file reading.
const int kNumFiles = kMMapLimit + 5;
leveldb::RandomAccessFile* files[kNumFiles] = {0};
for (int i = 0; i < kNumFiles; i++) {
ASSERT_OK(env_->NewRandomAccessFile(test_file, &files[i]));
}
char scratch;
Slice read_result;
for (int i = 0; i < kNumFiles; i++) {
ASSERT_OK(files[i]->Read(i, 1, &read_result, &scratch));
ASSERT_EQ(kFileData[i], read_result[0]);
}
for (int i = 0; i < kNumFiles; i++) {
delete files[i];
}
ASSERT_OK(env_->DeleteFile(test_file));
}
} // namespace leveldb
int main(int argc, char** argv) {
// All tests currently run with the same read-only file limits.
leveldb::EnvWindowsTest::SetFileLimits(leveldb::kMMapLimit);
return leveldb::test::RunAllTests();
}
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