Cache query documents transformed by InMemoryCache. #3553
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After #3444 removed `Map`-based caching for `addTypenameToDocument` (in order to fix memory leaks), the `InMemoryCache#transformDocument` method now creates a completely new `DocumentNode` every time it's called (assuming this.addTypename is true, which it is by default). This commit uses a `WeakMap` to cache calls to `addTypenameToDocument` in `InMemoryCache#transformDocument`, so that repeated cache reads will no longer create an unbounded number of new `DocumentNode` objects. The benefit of the `WeakMap` is that it does not prevent its keys (the original `DocumentNode` objects) from being garbage collected, which is another way of preventing memory leaks. Note that `WeakMap` may have to be polyfilled in older browsers, but there are many options for that. This optimization will be important for #3394, since the query document is involved in cache keys used to store cache partial query results. cc @hwillson @jbaxleyiii @brunorzn
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After #3444 removed
Map-based caching foraddTypenameToDocument(in order to fix memory leaks), theInMemoryCache#transformDocumentmethod now creates a completely newDocumentNodeevery time it's called (assumingthis.addTypenameis true, which it is by default).This commit uses a
WeakMapto cache calls toaddTypenameToDocumentinInMemoryCache#transformDocument, so that repeated cache reads will no longer create an unbounded number of newDocumentNodeobjects. The benefit of theWeakMapis that it does not prevent its keys (the originalDocumentNodeobjects) from being garbage collected, which is another way of preventing memory leaks. Note thatWeakMapmay have to be polyfilled in older browsers, but there are many options for that.This optimization will be important for #3394, since the query document is involved in cache keys used to store cache partial query results.
cc @hwillson @jbaxleyiii @brunorzn