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/**
* 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.transport.amqp;
import java.io.IOException;
import java.util.Timer;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.activemq.thread.SchedulerTimerTask;
import org.apache.activemq.transport.AbstractInactivityMonitor;
import org.apache.activemq.transport.InactivityIOException;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportFilter;
import org.apache.activemq.wireformat.WireFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AmqpInactivityMonitor extends TransportFilter {
private static final Logger LOG = LoggerFactory.getLogger(AmqpInactivityMonitor.class);
private static ThreadPoolExecutor ASYNC_TASKS;
private static int CONNECTION_CHECK_TASK_COUNTER;
private static Timer CONNECTION_CHECK_TASK_TIMER;
private static int KEEPALIVE_TASK_COUNTER;
private static Timer KEEPALIVE_TASK_TIMER;
private final AtomicBoolean failed = new AtomicBoolean(false);
private AmqpTransport amqpTransport;
private long connectionTimeout = AmqpWireFormat.DEFAULT_CONNECTION_TIMEOUT;
private SchedulerTimerTask connectCheckerTask;
private final Runnable connectChecker = new Runnable() {
private final long startTime = System.currentTimeMillis();
@Override
public void run() {
long now = System.currentTimeMillis();
if ((now - startTime) >= connectionTimeout && connectCheckerTask != null && !ASYNC_TASKS.isShutdown()) {
LOG.debug("No connection attempt made in time for {}! Throwing InactivityIOException.", AmqpInactivityMonitor.this.toString());
try {
ASYNC_TASKS.execute(new Runnable() {
@Override
public void run() {
onException(new InactivityIOException(
"Channel was inactive for too (>" + (connectionTimeout) + ") long: " + next.getRemoteAddress()));
}
});
} catch (RejectedExecutionException ex) {
if (!ASYNC_TASKS.isShutdown()) {
LOG.error("Async connection timeout task was rejected from the executor: ", ex);
throw ex;
}
}
}
}
};
private SchedulerTimerTask keepAliveTask;
private final Runnable keepAlive = new Runnable() {
@Override
public void run() {
if (keepAliveTask != null && !ASYNC_TASKS.isShutdown()) {
try {
ASYNC_TASKS.execute(new Runnable() {
@Override
public void run() {
try {
long nextIdleUpdate = amqpTransport.keepAlive();
if (nextIdleUpdate > 0) {
synchronized (AmqpInactivityMonitor.this) {
if (keepAliveTask != null) {
keepAliveTask = new SchedulerTimerTask(keepAlive);
KEEPALIVE_TASK_TIMER.schedule(keepAliveTask, nextIdleUpdate);
}
}
}
} catch (Exception ex) {
onException(new InactivityIOException(
"Exception while performing idle checks for connection: " + next.getRemoteAddress()));
}
}
});
} catch (RejectedExecutionException ex) {
if (!ASYNC_TASKS.isShutdown()) {
LOG.error("Async connection timeout task was rejected from the executor: ", ex);
throw ex;
}
}
}
}
};
public AmqpInactivityMonitor(Transport next, WireFormat wireFormat) {
super(next);
}
@Override
public void start() throws Exception {
next.start();
}
@Override
public void stop() throws Exception {
stopConnectionTimeoutChecker();
stopKeepAliveTask();
next.stop();
}
@Override
public void onException(IOException error) {
if (failed.compareAndSet(false, true)) {
stopConnectionTimeoutChecker();
if (amqpTransport != null) {
amqpTransport.onException(error);
}
transportListener.onException(error);
}
}
public void setAmqpTransport(AmqpTransport amqpTransport) {
this.amqpTransport = amqpTransport;
}
public AmqpTransport getAmqpTransport() {
return amqpTransport;
}
public synchronized void startConnectionTimeoutChecker(long connectionTimeout) {
this.connectionTimeout = connectionTimeout;
if (connectionTimeout > 0 && connectCheckerTask == null) {
connectCheckerTask = new SchedulerTimerTask(connectChecker);
long connectionCheckInterval = Math.min(connectionTimeout, 1000);
synchronized (AbstractInactivityMonitor.class) {
if (CONNECTION_CHECK_TASK_COUNTER == 0) {
if (ASYNC_TASKS == null || ASYNC_TASKS.isShutdown()) {
ASYNC_TASKS = createExecutor();
}
CONNECTION_CHECK_TASK_TIMER = new Timer("AMQP InactivityMonitor State Check", true);
}
CONNECTION_CHECK_TASK_COUNTER++;
CONNECTION_CHECK_TASK_TIMER.schedule(connectCheckerTask, connectionCheckInterval, connectionCheckInterval);
}
}
}
/**
* Starts the keep alive task which will run after the given delay.
*
* @param nextKeepAliveCheck
* time in milliseconds to wait before performing the next keep-alive check.
*/
public synchronized void startKeepAliveTask(long nextKeepAliveCheck) {
if (nextKeepAliveCheck > 0 && keepAliveTask == null) {
keepAliveTask = new SchedulerTimerTask(keepAlive);
synchronized (AbstractInactivityMonitor.class) {
if (KEEPALIVE_TASK_COUNTER == 0) {
if (ASYNC_TASKS == null || ASYNC_TASKS.isShutdown()) {
ASYNC_TASKS = createExecutor();
}
KEEPALIVE_TASK_TIMER = new Timer("AMQP InactivityMonitor Idle Update", true);
}
KEEPALIVE_TASK_COUNTER++;
KEEPALIVE_TASK_TIMER.schedule(keepAliveTask, nextKeepAliveCheck);
}
}
}
public synchronized void stopConnectionTimeoutChecker() {
if (connectCheckerTask != null) {
connectCheckerTask.cancel();
connectCheckerTask = null;
synchronized (AbstractInactivityMonitor.class) {
CONNECTION_CHECK_TASK_TIMER.purge();
CONNECTION_CHECK_TASK_COUNTER--;
if (CONNECTION_CHECK_TASK_COUNTER == 0) {
CONNECTION_CHECK_TASK_TIMER.cancel();
CONNECTION_CHECK_TASK_TIMER = null;
}
}
}
}
public synchronized void stopKeepAliveTask() {
if (keepAliveTask != null) {
keepAliveTask.cancel();
keepAliveTask = null;
synchronized (AbstractInactivityMonitor.class) {
KEEPALIVE_TASK_TIMER.purge();
KEEPALIVE_TASK_COUNTER--;
if (KEEPALIVE_TASK_COUNTER == 0) {
KEEPALIVE_TASK_TIMER.cancel();
KEEPALIVE_TASK_TIMER = null;
}
}
}
}
private final ThreadFactory factory = new ThreadFactory() {
@Override
public Thread newThread(Runnable runnable) {
Thread thread = new Thread(runnable, "AmqpInactivityMonitor Async Task: " + runnable);
thread.setDaemon(true);
return thread;
}
};
private ThreadPoolExecutor createExecutor() {
ThreadPoolExecutor exec = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 90, TimeUnit.SECONDS, new SynchronousQueue(), factory);
exec.allowCoreThreadTimeOut(true);
return exec;
}
}