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abaacdff8f
This moves System._extensions into core and creates the pattern where extensions push themselves into the array.
44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
/*
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* Dependency Tree Cache
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*
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* Allows a build to pre-populate a dependency trace tree on the loader of
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* the expected dependency tree, to be loaded upfront when requesting the
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* module, avoinding the n round trips latency of module loading, where
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* n is the dependency tree depth.
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*
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* eg:
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* System.depCache = {
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* 'app': ['normalized', 'deps'],
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* 'normalized': ['another'],
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* 'deps': ['tree']
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* };
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*
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* System.import('app')
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* // simultaneously starts loading all of:
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* // 'normalized', 'deps', 'another', 'tree'
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* // before "app" source is even loaded
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*/
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function depCache(loader) {
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loader.depCache = loader.depCache || {};
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loader._extensions.push(depCache);
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loaderLocate = loader.locate;
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loader.locate = function(load) {
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var loader = this;
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if (!loader.depCache)
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loader.depCache = {};
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// load direct deps, in turn will pick up their trace trees
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var deps = loader.depCache[load.name];
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if (deps)
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for (var i = 0; i < deps.length; i++)
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loader.load(deps[i]);
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return loaderLocate.call(loader, load);
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}
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}
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