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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
// Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2. For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.impl;
import com.rabbitmq.client.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* Base class for {@link MetricsCollector}.
* Implements tricky logic such as keeping track of acknowledged and
* rejected messages. Sub-classes just need to implement
* the logic to increment their metrics.
* Note transactions are not supported (see {@link MetricsCollector}.
*
* @see MetricsCollector
*/
public abstract class AbstractMetricsCollector implements MetricsCollector {
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractMetricsCollector.class);
private final ConcurrentMap connectionState = new ConcurrentHashMap();
private final Runnable markAcknowledgedMessageAction = new Runnable() {
@Override
public void run() {
markAcknowledgedMessage();
}
};
private final Runnable markRejectedMessageAction = new Runnable() {
@Override
public void run() {
markRejectedMessage();
}
};
@Override
public void newConnection(final Connection connection) {
try {
if(connection.getId() == null) {
connection.setId(UUID.randomUUID().toString());
}
incrementConnectionCount(connection);
connectionState.put(connection.getId(), new ConnectionState(connection));
connection.addShutdownListener(new ShutdownListener() {
@Override
public void shutdownCompleted(ShutdownSignalException cause) {
closeConnection(connection);
}
});
} catch(Exception e) {
LOGGER.info("Error while computing metrics in newConnection: " + e.getMessage());
}
}
@Override
public void closeConnection(Connection connection) {
try {
ConnectionState removed = connectionState.remove(connection.getId());
if(removed != null) {
decrementConnectionCount(connection);
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in closeConnection: " + e.getMessage());
}
}
@Override
public void newChannel(final Channel channel) {
try {
incrementChannelCount(channel);
channel.addShutdownListener(new ShutdownListener() {
@Override
public void shutdownCompleted(ShutdownSignalException cause) {
closeChannel(channel);
}
});
connectionState(channel.getConnection()).channelState.put(channel.getChannelNumber(), new ChannelState(channel));
} catch(Exception e) {
LOGGER.info("Error while computing metrics in newChannel: " + e.getMessage());
}
}
@Override
public void closeChannel(Channel channel) {
try {
ChannelState removed = connectionState(channel.getConnection()).channelState.remove(channel.getChannelNumber());
if(removed != null) {
decrementChannelCount(channel);
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in closeChannel: " + e.getMessage());
}
}
@Override
public void basicPublish(Channel channel) {
try {
markPublishedMessage();
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicPublish: " + e.getMessage());
}
}
@Override
public void basicConsume(Channel channel, String consumerTag, boolean autoAck) {
try {
if(!autoAck) {
ChannelState channelState = channelState(channel);
channelState.lock.lock();
try {
channelState(channel).consumersWithManualAck.add(consumerTag);
} finally {
channelState.lock.unlock();
}
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicConsume: " + e.getMessage());
}
}
@Override
public void basicCancel(Channel channel, String consumerTag) {
try {
ChannelState channelState = channelState(channel);
channelState.lock.lock();
try {
channelState(channel).consumersWithManualAck.remove(consumerTag);
} finally {
channelState.lock.unlock();
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicCancel: " + e.getMessage());
}
}
@Override
public void consumedMessage(Channel channel, long deliveryTag, boolean autoAck) {
try {
markConsumedMessage();
if(!autoAck) {
ChannelState channelState = channelState(channel);
channelState.lock.lock();
try {
channelState(channel).unackedMessageDeliveryTags.add(deliveryTag);
} finally {
channelState.lock.unlock();
}
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in consumedMessage: " + e.getMessage());
}
}
@Override
public void consumedMessage(Channel channel, long deliveryTag, String consumerTag) {
try {
markConsumedMessage();
ChannelState channelState = channelState(channel);
channelState.lock.lock();
try {
if(channelState.consumersWithManualAck.contains(consumerTag)) {
channelState.unackedMessageDeliveryTags.add(deliveryTag);
}
} finally {
channelState.lock.unlock();
}
} catch(Exception e) {
LOGGER.info("Error while computing metrics in consumedMessage: " + e.getMessage());
}
}
@Override
public void basicAck(Channel channel, long deliveryTag, boolean multiple) {
try {
updateChannelStateAfterAckReject(channel, deliveryTag, multiple, markAcknowledgedMessageAction);
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicAck: " + e.getMessage());
}
}
@Override
public void basicNack(Channel channel, long deliveryTag) {
try {
updateChannelStateAfterAckReject(channel, deliveryTag, true, markRejectedMessageAction);
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicNack: " + e.getMessage());
}
}
@Override
public void basicReject(Channel channel, long deliveryTag) {
try {
updateChannelStateAfterAckReject(channel, deliveryTag, false, markRejectedMessageAction);
} catch(Exception e) {
LOGGER.info("Error while computing metrics in basicReject: " + e.getMessage());
}
}
private void updateChannelStateAfterAckReject(Channel channel, long deliveryTag, boolean multiple, Runnable action) {
ChannelState channelState = channelState(channel);
channelState.lock.lock();
try {
if(multiple) {
Iterator iterator = channelState.unackedMessageDeliveryTags.iterator();
while(iterator.hasNext()) {
long messageDeliveryTag = iterator.next();
if(messageDeliveryTag <= deliveryTag) {
iterator.remove();
action.run();
}
}
} else {
if (channelState.unackedMessageDeliveryTags.remove(deliveryTag)) {
action.run();
}
}
} finally {
channelState.lock.unlock();
}
}
private ConnectionState connectionState(Connection connection) {
return connectionState.get(connection.getId());
}
private ChannelState channelState(Channel channel) {
return connectionState(channel.getConnection()).channelState.get(channel.getChannelNumber());
}
/**
* Clean inner state for close connections and channels.
* Inner state is automatically cleaned on connection
* and channel closing.
* Thus, this method is provided as a safety net, to be externally
* called periodically if closing of resources wouldn't work
* properly for some corner cases.
*/
public void cleanStaleState() {
try {
Iterator> connectionStateIterator = connectionState.entrySet().iterator();
while(connectionStateIterator.hasNext()) {
Map.Entry connectionEntry = connectionStateIterator.next();
Connection connection = connectionEntry.getValue().connection;
if(connection.isOpen()) {
Iterator> channelStateIterator = connectionEntry.getValue().channelState.entrySet().iterator();
while(channelStateIterator.hasNext()) {
Map.Entry channelStateEntry = channelStateIterator.next();
Channel channel = channelStateEntry.getValue().channel;
if(!channel.isOpen()) {
channelStateIterator.remove();
decrementChannelCount(channel);
LOGGER.info("Ripped off state of channel {} of connection {}. This is abnormal, please report.",
channel.getChannelNumber(), connection.getId());
}
}
} else {
connectionStateIterator.remove();
decrementConnectionCount(connection);
for(int i = 0; i < connectionEntry.getValue().channelState.size(); i++) {
decrementChannelCount(null);
}
LOGGER.info("Ripped off state of connection {}. This is abnormal, please report.",
connection.getId());
}
}
} catch(Exception e) {
LOGGER.info("Error during periodic clean of metricsCollector: "+e.getMessage());
}
}
private static class ConnectionState {
final ConcurrentMap channelState = new ConcurrentHashMap();
final Connection connection;
private ConnectionState(Connection connection) {
this.connection = connection;
}
}
private static class ChannelState {
final Lock lock = new ReentrantLock();
final Set unackedMessageDeliveryTags = new HashSet();
final Set consumersWithManualAck = new HashSet();
final Channel channel;
private ChannelState(Channel channel) {
this.channel = channel;
}
}
/**
* Increments connection count.
* The connection object is passed in as complementary information
* and without any guarantee of not being null.
* @param connection the connection that has been created (can be null)
*/
protected abstract void incrementConnectionCount(Connection connection);
/**
* Decrements connection count.
* The connection object is passed in as complementary information
* and without any guarantee of not being null.
* @param connection the connection that has been closed (can be null)
*/
protected abstract void decrementConnectionCount(Connection connection);
/**
* Increments channel count.
* The channel object is passed in as complementary information
* and without any guarantee of not being null.
* @param channel the channel that has been created (can be null)
*/
protected abstract void incrementChannelCount(Channel channel);
/**
* Decrements channel count.
* The channel object is passed in as complementary information
* and without any guarantee of not being null.
* @param channel
*/
protected abstract void decrementChannelCount(Channel channel);
/**
* Marks the event of a published message.
*/
protected abstract void markPublishedMessage();
/**
* Marks the event of a consumed message.
*/
protected abstract void markConsumedMessage();
/**
* Marks the event of an acknowledged message.
*/
protected abstract void markAcknowledgedMessage();
/**
* Marks the event of a rejected message.
*/
protected abstract void markRejectedMessage();
}