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/*
* Dependency Tree Cache
*
* Allows a build to pre-populate a dependency trace tree on the loader of
* the expected dependency tree, to be loaded upfront when requesting the
* module, avoinding the n round trips latency of module loading, where
* n is the dependency tree depth.
*
* eg:
* SystemJS.depCache = {
* 'app': ['normalized', 'deps'],
* 'normalized': ['another'],
* 'deps': ['tree']
* };
*
* SystemJS.import('app')
* // simultaneously starts loading all of:
* // 'normalized', 'deps', 'another', 'tree'
* // before "app" source is even loaded
*
*/
(function() {
hookConstructor(function(constructor) {
return function() {
constructor.call(this);
this.depCache = {};
}
});
hook('locate', function(locate) {
return function(load) {
var loader = this;
// load direct deps, in turn will pick up their trace trees
var deps = loader.depCache[load.name];
if (deps)
for (var i = 0; i < deps.length; i++)
loader['import'](deps[i], load.name);
return locate.call(loader, load);
};
});
})();
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