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Fixed issue: NETTY-360 Changing Channel.interestOps sometimes does not work under heavy write traffic in NIO transport

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* Made sure all setRawInterestOps() calls are protected by interestOpsLock
Fixed a race condition in the HexDumpProxy example
This commit is contained in:
Trustin Lee 2010-10-24 18:24:20 +00:00
parent d9dba0d754
commit 1f2285f57e
3 changed files with 47 additions and 53 deletions
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24
src/main/java/org/jboss/netty/channel/socket/nio/NioDatagramWorker.java
View File

@ -604,24 +604,18 @@ class NioDatagramWorker implements Runnable {
close(key);
return;
}
int interestOps;
boolean changed = false;
// interestOps can change at any time and at any thread.
// Acquire a lock to avoid possible race condition.
synchronized (channel.interestOpsLock) {
interestOps = channel.getRawInterestOps();
int interestOps = channel.getRawInterestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
interestOps |= SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
}
private void clearOpWrite(NioDatagramChannel channel) {
Selector selector = this.selector;
@ -633,24 +627,18 @@ class NioDatagramWorker implements Runnable {
close(key);
return;
}
int interestOps;
boolean changed = false;
// interestOps can change at any time and at any thread.
// Acquire a lock to avoid possible race condition.
synchronized (channel.interestOpsLock) {
interestOps = channel.getRawInterestOps();
int interestOps = channel.getRawInterestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
interestOps &= ~SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
}
static void disconnect(NioDatagramChannel channel, ChannelFuture future) {
boolean connected = channel.isConnected();
@ -811,11 +799,13 @@ class NioDatagramWorker implements Runnable {
default:
throw new Error();
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
future.setSuccess();
if (changed) {
channel.setRawInterestOpsNow(interestOps);
fireChannelInterestChanged(channel);
}
} catch (final CancelledKeyException e) {

25
src/main/java/org/jboss/netty/channel/socket/nio/NioWorker.java
View File

@ -536,24 +536,18 @@ class NioWorker implements Runnable {
close(key);
return;
}
int interestOps;
boolean changed = false;
// interestOps can change at any time and at any thread.
// Acquire a lock to avoid possible race condition.
synchronized (channel.interestOpsLock) {
interestOps = channel.getRawInterestOps();
int interestOps = channel.getRawInterestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
interestOps |= SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
}
private void clearOpWrite(NioSocketChannel channel) {
Selector selector = this.selector;
@ -565,24 +559,18 @@ class NioWorker implements Runnable {
close(key);
return;
}
int interestOps;
boolean changed = false;
// interestOps can change at any time and at any thread.
// Acquire a lock to avoid possible race condition.
synchronized (channel.interestOpsLock) {
interestOps = channel.getRawInterestOps();
int interestOps = channel.getRawInterestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
interestOps &= ~SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
}
void close(NioSocketChannel channel, ChannelFuture future) {
boolean connected = channel.isConnected();
@ -719,11 +707,14 @@ class NioWorker implements Runnable {
default:
throw new Error();
}
if (changed) {
channel.setRawInterestOpsNow(interestOps);
}
}
future.setSuccess();
if (changed) {
channel.setRawInterestOpsNow(interestOps);
fireChannelInterestChanged(channel);
}
} catch (CancelledKeyException e) {

23
src/main/java/org/jboss/netty/example/proxy/HexDumpProxyInboundHandler.java
View File

@ -41,6 +41,11 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
private final String remoteHost;
private final int remotePort;
// This lock guards against the race condition that overrides the
// OP_READ flag incorrectly.
// See the related discussion: http://markmail.org/message/x7jc6mqx6ripynqf
final Object trafficLock = new Object();
private volatile Channel outboundChannel;
public HexDumpProxyInboundHandler(
@ -78,10 +83,11 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
public void messageReceived(ChannelHandlerContext ctx, final MessageEvent e)
throws Exception {
ChannelBuffer msg = (ChannelBuffer) e.getMessage();
System.out.println(">>> " + ChannelBuffers.hexDump(msg));
//System.out.println(">>> " + ChannelBuffers.hexDump(msg));
synchronized (trafficLock) {
outboundChannel.write(msg);
// If outboundChannel is saturated, do not read until notified in
// OutboundHandler.channelInterestChanged().
@ -89,16 +95,19 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
e.getChannel().setReadable(false);
}
}
}
@Override
public void channelInterestChanged(ChannelHandlerContext ctx,
ChannelStateEvent e) throws Exception {
// If inboundChannel is not saturated anymore, continue accepting
// the incoming traffic from the outboundChannel.
synchronized (trafficLock) {
if (e.getChannel().isWritable()) {
outboundChannel.setReadable(true);
}
}
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
@ -115,7 +124,7 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
closeOnFlush(e.getChannel());
}
private static class OutboundHandler extends SimpleChannelUpstreamHandler {
private class OutboundHandler extends SimpleChannelUpstreamHandler {
private final Channel inboundChannel;
@ -124,10 +133,11 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
public void messageReceived(ChannelHandlerContext ctx, final MessageEvent e)
throws Exception {
ChannelBuffer msg = (ChannelBuffer) e.getMessage();
System.out.println("<<< " + ChannelBuffers.hexDump(msg));
//System.out.println("<<< " + ChannelBuffers.hexDump(msg));
synchronized (trafficLock) {
inboundChannel.write(msg);
// If inboundChannel is saturated, do not read until notified in
// HexDumpProxyInboundHandler.channelInterestChanged().
@ -135,16 +145,19 @@ public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
e.getChannel().setReadable(false);
}
}
}
@Override
public void channelInterestChanged(ChannelHandlerContext ctx,
ChannelStateEvent e) throws Exception {
// If outboundChannel is not saturated anymore, continue accepting
// the incoming traffic from the inboundChannel.
synchronized (trafficLock) {
if (e.getChannel().isWritable()) {
inboundChannel.setReadable(true);
}
}
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)