/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.artemis.core.remoting.impl.netty;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.ImmediateEventExecutor;
import io.netty.util.concurrent.Promise;
import org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl;
import org.apache.activemq.artemis.utils.ActiveMQThreadFactory;
public class SharedEventLoopGroup extends DelegatingEventLoopGroup {
private static SharedEventLoopGroup instance;
private final AtomicReference<ScheduledFuture<?>> shutdown = new AtomicReference<>();
private final AtomicLong channelFactoryCount = new AtomicLong();
private final Promise<?> terminationPromise = ImmediateEventExecutor.INSTANCE.newPromise();
private SharedEventLoopGroup(EventLoopGroup eventLoopGroup) {
super(eventLoopGroup);
}
public static synchronized void forceShutdown() {
if (instance != null) {
instance.forEach(executor -> executor.shutdownGracefully(0, 0, TimeUnit.MILLISECONDS));
instance.channelFactoryCount.set(0);
instance = null;
}
}
public static synchronized SharedEventLoopGroup getInstance(Function<ThreadFactory, EventLoopGroup> eventLoopGroupSupplier) {
if (instance != null) {
ScheduledFuture<?> f = instance.shutdown.getAndSet(null);
if (f != null) {
f.cancel(false);
}
} else {
instance = new SharedEventLoopGroup(eventLoopGroupSupplier.apply(AccessController.doPrivileged(new PrivilegedAction<ThreadFactory>() {
@Override
public ThreadFactory run() {
return new ActiveMQThreadFactory("ActiveMQ-client-netty-threads", true, ClientSessionFactoryImpl.class.getClassLoader());
}
})));
}
instance.channelFactoryCount.incrementAndGet();
return instance;
}
@Override
public Future<?> terminationFuture() {
return terminationPromise;
}
@Override
public Future<?> shutdownGracefully() {
return shutdownGracefully(100, 3000, TimeUnit.MILLISECONDS);
}
@Override
public Future<?> shutdownGracefully(final long l, final long l2, final TimeUnit timeUnit) {
if (channelFactoryCount.decrementAndGet() == 0) {
shutdown.compareAndSet(null, next().scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
synchronized (SharedEventLoopGroup.class) {
if (shutdown.get() != null) {
Future<?> future = SharedEventLoopGroup.super.shutdownGracefully(l, l2, timeUnit);
future.addListener(new FutureListener<Object>() {
@Override
public void operationComplete(Future<Object> future) throws Exception {
if (future.isSuccess()) {
terminationPromise.setSuccess(null);
} else {
terminationPromise.setFailure(future.cause());
}
}
});
instance = null;
}
}
}
}, 10, 10, TimeUnit.SECONDS));
}
return terminationPromise;
}
}