Reactivate reactive variables when InMemoryCache acquires first watcher. #7657
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Fixes a bug introduced by #7279, which was triggered by calling this.cancel() before re-watching in the QueryInfo#updateWatch method, causing cache.watches.size to drop to zero temporarily, thereby invoking forgetCache(cache). When this happened, reactive variables would stop broadcasting updates to the forgotten cache, even though the unwatching was only momentary, and would not begin broadcasting again until the association was reestablished by other means. This new implementation uses a WeakMap to remember the association between caches and sets of reactive variables, which makes it possible to recall those associations later, provided the cache has not been garbage collected in the meantime.
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This was referenced Mar 11, 2021
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Fixes a bug introduced by #7279, which was triggered by calling
this.cancel()before re-watching in theQueryInfo#updateWatchmethod, causingcache.watches.sizeto drop to zero temporarily, thereby invokingforgetCache(cache). When this happened, reactive variables would stop broadcasting updates to the forgotten cache, even though the unwatching was only momentary, and would not begin broadcasting again until the association was reestablished by other means.This new implementation uses a
WeakMapto remember associations between caches and sets of reactive variables, which makes it possible to recall those associations later, provided the cache has not been garbage collected in the meantime.Should fix #7593 and #7630, though #7622 remains a concern.