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Ability to return just the length of listeners for a given type, using
EventEmitter.listenerCount(emitter, event). This will be a lot cheaper
than creating a copy of the listeners array just to check its length.
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The removed line was removing a calllback that was never setup
in first place. 016afe2 forgot to remove this.
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This reverts 6c5b31bd which had too few use cases, too much complexity,
and can be handled in user-land by using `{end: false}`.
Closes #1996
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Also setting up a circular reference back to the
stream as `Stream.Stream`, for backwards-compatibility.
Fixes #1933
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Too complex; unnecessary.
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Squashed:
* Simple change to make Stream.pipe(destination) return the destination Stream
* Test: ensure Stream.pipe(destination) returns the destination Stream
* updated Stream.pipe() documentation to reflect that it now returns the
destination stream
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Problem: Since stream.pipe() is registering it's own error handlers on
the source and destination stream, it needs to replicate the
EventEmitter 'error' emitting semantics of throwing an error if there
are no other listeners. However, there was a off-by-one error because
the check for remaining listeners was done after cleanup() which means
the pipe's own listener was no longer included.
This would cause 'error' events on either the dest or the source to
throw if there was one other error listener, and while swallowing
the 'error' event if there was no other listener.
Solution: I added a test demonstrating the two issues and fixed the
problem by correcting the off-by-one error.
Fixes #1095.
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This fixes a critical bug see in MJR's production. Very difficult to build a
test case. Sometimes HTTPS server gets sockets that are hanging in a
half-duplex state.
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This commit does three things:
1. Uses an exposed counter rather than a hidden array for tracking dest
streams that may have multiple inputs. This allows for significantly
faster lookups, since the counter can be checked in constant time rather
than searching an array for the dest object. (A proper O(1) WeakMap
would be better, but that may have to wait for Harmony.)
2. Calls the 'end' event logic when there is an 'error' event on the
source object (and then throws if there are no other error listeners.)
This is important, because otherwise 'error' events would lead to
memory leaks.
3. Clean up the style a bit. Function Declarations are not allowed
within blocks in ES strict. Prefer Function Declarations to Function
Expressions, because hoisting allows for more expressive ordering of
logic.
Downside: It adds "_pipeCount" as part of the Stream API. It'll work
fine if the member is missing, but if anyone tries to use it for some
other purpose, it can mess things up.
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When creating multiple .pipe()s to the same destination stream, the
first source to end would close the destination, breaking all remaining
pipes. This patch fixes the problem by keeping track of all open
pipes, so that we only call end on destinations that have no more
sources piping to them.
closes #929
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This reverts commit 24aded078fd6838d2f21934e57c7cc8dfd7303d1.
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