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Remove synchronized blocks to optimize BufferedWriteHandler. See #519

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This commit is contained in:
norman 2012-08-15 15:02:48 +02:00
parent f1ba4f23a6
commit 88124d88ce
1 changed files with 18 additions and 10 deletions
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28
src/main/java/org/jboss/netty/handler/queue/BufferedWriteHandler.java
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@ -22,6 +22,7 @@ import java.util.List;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
@ -165,6 +166,7 @@ public class BufferedWriteHandler extends SimpleChannelHandler implements LifeCy
private final Queue<MessageEvent> queue;
private final boolean consolidateOnFlush;
private volatile ChannelHandlerContext ctx;
private final AtomicBoolean flush = new AtomicBoolean(false);
/**
* Creates a new instance with the default unbounded {@link BlockingQueue}
@ -244,15 +246,18 @@ public class BufferedWriteHandler extends SimpleChannelHandler implements LifeCy
// No write request was made.
return;
}
Channel channel = ctx.getChannel();
boolean acquired;
final Queue<MessageEvent> queue = getQueue();
if (consolidateOnFlush) {
if (queue.isEmpty()) {
return;
}
// use CAS to see if the have flush already running, if so we don't need to take further actions
if (acquired = flush.compareAndSet(false, true)) {
final Queue<MessageEvent> queue = getQueue();
if (consolidateOnFlush) {
if (queue.isEmpty()) {
return;
}
List<MessageEvent> pendingWrites = new ArrayList<MessageEvent>();
synchronized (this) {
List<MessageEvent> pendingWrites = new ArrayList<MessageEvent>();
for (;;) {
MessageEvent e = queue.poll();
if (e == null) {
@ -268,9 +273,8 @@ public class BufferedWriteHandler extends SimpleChannelHandler implements LifeCy
}
}
consolidatedWrite(pendingWrites);
}
} else {
synchronized (this) {
} else {
for (;;) {
MessageEvent e = queue.poll();
if (e == null) {
@ -280,6 +284,10 @@ public class BufferedWriteHandler extends SimpleChannelHandler implements LifeCy
}
}
}
if (acquired && (!channel.isConnected() || channel.isWritable() && !queue.isEmpty())) {
flush(consolidateOnFlush);
}
}
private List<MessageEvent> consolidatedWrite(final List<MessageEvent> pendingWrites) {