/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.io;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.util.containers.ContainerUtil;
import io.netty.channel.*;
import io.netty.util.concurrent.GenericFutureListener;
import org.jetbrains.annotations.NotNull;
import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
@ChannelHandler.Sharable
public final class ChannelRegistrar extends ChannelInboundHandlerAdapter {
private static final Logger LOG = Logger.getInstance(ChannelRegistrar.class);
private final AtomicReference<ServerChannel> serverChannel = new AtomicReference<>();
private final Set<Channel> clientChannels = ContainerUtil.newConcurrentSet();
private boolean isEventLoopGroupOwner;
public boolean isEmpty() {
return serverChannel.get() == null && clientChannels.isEmpty();
}
public void setServerChannel(@NotNull Channel channel, boolean isOwnEventLoopGroup) {
boolean isSet = serverChannel.compareAndSet(null, (ServerChannel)channel);
LOG.assertTrue(isSet);
this.isEventLoopGroupOwner = isOwnEventLoopGroup;
}
@Override
public void channelActive(@NotNull ChannelHandlerContext context) throws Exception {
clientChannels.add(context.channel());
super.channelActive(context);
}
@Override
public void channelInactive(@NotNull ChannelHandlerContext context) throws Exception {
clientChannels.remove(context.channel());
super.channelInactive(context);
}
public void close() {
close(isEventLoopGroupOwner);
}
private void close(boolean shutdownEventLoopGroup) {
ServerChannel serverChannel = this.serverChannel.get();
if (serverChannel == null) {
LOG.assertTrue(clientChannels.isEmpty());
return;
}
else if (!this.serverChannel.compareAndSet(serverChannel, null)) {
return;
}
EventLoopGroup eventLoopGroup = shutdownEventLoopGroup ? serverChannel.eventLoop().parent() : null;
try {
long start = System.currentTimeMillis();
Channel[] clientChannels = this.clientChannels.toArray(new Channel[]{});
this.clientChannels.clear();
final CountDownLatch countDown = new CountDownLatch(clientChannels.length + 1);
GenericFutureListener<ChannelFuture> listener = new GenericFutureListener<ChannelFuture>() {
@Override
public void operationComplete(@NotNull ChannelFuture future) throws Exception {
try {
Throwable cause = future.cause();
if (cause != null) {
LOG.warn(cause);
}
}
finally {
countDown.countDown();
}
}
};
serverChannel.close().addListener(listener);
for (Channel channel : clientChannels) {
channel.close().addListener(listener);
}
try {
countDown.await(5, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
LOG.warn("Cannot close all channels for 10 seconds, channels: " + Arrays.toString(clientChannels));
}
long duration = System.currentTimeMillis() - start;
if (duration > 1000) {
LOG.info("Close all channels took " + duration + " ms: " + (duration / 60000) + " min " + ((duration % 60000) / 1000) + "sec");
}
}
finally {
if (eventLoopGroup != null) {
eventLoopGroup.shutdownGracefully(1, 2, TimeUnit.NANOSECONDS);
}
}
}
}