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Due to the runtime's inability to collect cycles involving finalizers, we can't close over handles in memoize.Functions without causing memory leaks. Up until now we've dealt with that by closing over all the bits of the snapshot that we want, but it distorts the design of all the code used in the Functions. We can solve the problem another way: instead of closing over the snapshot/view, we can force the caller to pass it in. This is somewhat scary: there is no requirement that the argument matches the data that we're working with. But the reality is that this is not a new problem: the Function used to calculate a cache value is not necessarily the one that the caller expects. As long as the cache key fully identifies all the inputs to the Function, the output should be correct. And since the caller used the snapshot/view to calculate that cache key, it should always be safe to pass in that snapshot/view. If it's not, then we already had a bug. The Arg type in memoize is clumsy, but I thought it would be nice to have at least a little bit of type safety. I'm open to suggestions. Change-Id: I23f546638b0c66a4698620a986949087211f4762 Reviewed-on: https://go-review.googlesource.com/c/tools/+/244019 Reviewed-by: Robert Findley <rfindley@google.com> Reviewed-by: Rebecca Stambler <rstambler@golang.org> |
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