Make it easier to write lazy streams #10494
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This commit manages a lifecycle for streams. If a stream has no subscribers, it is considered "inactive". When a stream gets subscribers, it becomes "active". A stream can register dependencies on other streams regardless of whether the stream itself is active. When the stream becomes active, the dependency will activate its subscriptions. When the stream becomes inactive, the dependency will deactivate its subscriptions. When a stream is destroyed, it automatically deactivates the subscriptions of all dependencies. This commit also add a new "revalidate" hook for streams, which gets invoked when the `valueFn` is called, and right before a stream becomes active. This hook can be used to tear down any state on the old value of a dependent stream. For example, the `KeyStream` uses this hook to tear down observers when the backing object for the stream has changed.
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mmun
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Feb 20, 2015
Make it easier to write lazy streams
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This PR incorporates stream-list.
This commit manages a lifecycle for streams. If a stream has no
subscribers, it is considered "inactive". When a stream gets
subscribers, it becomes "active".
A stream can register dependencies on other streams regardless of
whether the stream itself is active. When the stream becomes active, the
dependency will activate its subscriptions. When the stream becomes
inactive, the dependency will deactivate its subscriptions.
When a stream is destroyed, it automatically deactivates the
subscriptions of all dependencies.
This commit also add a new "revalidate" hook for streams, which gets
invoked when the
valueFnis called, and right before a stream becomesactive. This hook can be used to tear down any state on the old value of
a dependent stream. For example, the
KeyStreamuses this hook to teardown observers when the backing object for the stream has changed.