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[#2577] ChannelOutboundBuffer.addFlush() unnecessary loop through all entries on multiple calls

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Motivation:

If ChannelOutboundBuffer.addFlush() is called multiple times and flushed != unflushed it will still loop through all entries that are not flushed yet even if it is not needed anymore as these were marked uncancellable before.

Modifications:

Check if new messages were added since addFlush() was called and only if this was the case loop through all entries and try to mark the uncancellable.

Result:

Less overhead when ChannelOuboundBuffer.addFlush() is called multiple times without new messages been added.
This commit is contained in:
Norman Maurer 2014-06-17 09:26:04 +02:00
parent b8a7881588
commit b627824b18
1 changed files with 16 additions and 10 deletions
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6
transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
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@ -173,6 +173,11 @@ public final class ChannelOutboundBuffer {
} }
void addFlush() { void addFlush() {
// There is no need to process all entries if there was already a flush before and no new messages
// where added in the meantime.
//
// See https://github.com/netty/netty/issues/2577
if (unflushed != tail) {
unflushed = tail; unflushed = tail;
final int mask = buffer.length - 1; final int mask = buffer.length - 1;
@ -187,6 +192,7 @@ public final class ChannelOutboundBuffer {
i = i + 1 & mask; i = i + 1 & mask;
} }
} }
}
/** /**
* Increment the pending bytes which will be written at some point. * Increment the pending bytes which will be written at some point.