| /** |
| * 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.broker.region.policy; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.activemq.broker.Broker; |
| import org.apache.activemq.broker.Connection; |
| import org.apache.activemq.broker.ConnectionContext; |
| import org.apache.activemq.broker.region.Subscription; |
| import org.apache.activemq.command.ConsumerControl; |
| import org.apache.activemq.thread.Scheduler; |
| import org.apache.activemq.transport.InactivityIOException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Abort slow consumers when they reach the configured threshold of slowness, default is slow for 30 seconds |
| * |
| * @org.apache.xbean.XBean |
| */ |
| public class AbortSlowConsumerStrategy implements SlowConsumerStrategy, Runnable { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AbortSlowConsumerStrategy.class); |
| |
| private String name = "AbortSlowConsumerStrategy@" + hashCode(); |
| private Scheduler scheduler; |
| private Broker broker; |
| private final AtomicBoolean taskStarted = new AtomicBoolean(false); |
| private final Map<Subscription, SlowConsumerEntry> slowConsumers = new ConcurrentHashMap<Subscription, SlowConsumerEntry>(); |
| |
| private long maxSlowCount = -1; |
| private long maxSlowDuration = 30*1000; |
| private long checkPeriod = 30*1000; |
| private boolean abortConnection = false; |
| |
| public void setBrokerService(Broker broker) { |
| this.scheduler = broker.getScheduler(); |
| this.broker = broker; |
| } |
| |
| public void slowConsumer(ConnectionContext context, Subscription subs) { |
| if (maxSlowCount < 0 && maxSlowDuration < 0) { |
| // nothing to do |
| LOG.info("no limits set, slowConsumer strategy has nothing to do"); |
| return; |
| } |
| |
| if (taskStarted.compareAndSet(false, true)) { |
| scheduler.executePeriodically(this, checkPeriod); |
| } |
| |
| if (!slowConsumers.containsKey(subs)) { |
| slowConsumers.put(subs, new SlowConsumerEntry(context)); |
| } else if (maxSlowCount > 0) { |
| slowConsumers.get(subs).slow(); |
| } |
| } |
| |
| public void run() { |
| if (maxSlowDuration > 0) { |
| // mark |
| for (SlowConsumerEntry entry : slowConsumers.values()) { |
| entry.mark(); |
| } |
| } |
| |
| HashMap<Subscription, SlowConsumerEntry> toAbort = new HashMap<Subscription, SlowConsumerEntry>(); |
| for (Entry<Subscription, SlowConsumerEntry> entry : slowConsumers.entrySet()) { |
| if (entry.getKey().isSlowConsumer()) { |
| if (maxSlowDuration > 0 && (entry.getValue().markCount * checkPeriod > maxSlowDuration) |
| || maxSlowCount > 0 && entry.getValue().slowCount > maxSlowCount) { |
| toAbort.put(entry.getKey(), entry.getValue()); |
| slowConsumers.remove(entry.getKey()); |
| } |
| } else { |
| LOG.info("sub: " + entry.getKey().getConsumerInfo().getConsumerId() + " is no longer slow"); |
| slowConsumers.remove(entry.getKey()); |
| } |
| } |
| |
| abortSubscription(toAbort, abortConnection); |
| } |
| |
| private void abortSubscription(Map<Subscription, SlowConsumerEntry> toAbort, boolean abortSubscriberConnection) { |
| for (final Entry<Subscription, SlowConsumerEntry> entry : toAbort.entrySet()) { |
| ConnectionContext connectionContext = entry.getValue().context; |
| if (connectionContext!= null) { |
| try { |
| LOG.info("aborting " |
| + (abortSubscriberConnection ? "connection" : "consumer") |
| + ", slow consumer: " + entry.getKey().getConsumerInfo().getConsumerId()); |
| |
| final Connection connection = connectionContext.getConnection(); |
| if (connection != null) { |
| if (abortSubscriberConnection) { |
| scheduler.executeAfterDelay(new Runnable() { |
| public void run() { |
| connection.serviceException(new InactivityIOException("Consumer was slow too often (>" |
| + maxSlowCount + ") or too long (>" |
| + maxSlowDuration + "): " + entry.getKey().getConsumerInfo().getConsumerId())); |
| }}, 0l); |
| } else { |
| // just abort the consumer by telling it to stop |
| ConsumerControl stopConsumer = new ConsumerControl(); |
| stopConsumer.setConsumerId(entry.getKey().getConsumerInfo().getConsumerId()); |
| stopConsumer.setClose(true); |
| connection.dispatchAsync(stopConsumer); |
| } |
| } else { |
| LOG.debug("slowConsumer abort ignored, no connection in context:" + connectionContext); |
| } |
| } catch (Exception e) { |
| LOG.info("exception on stopping " |
| + (abortSubscriberConnection ? "connection" : "consumer") |
| + " to abort slow consumer: " + entry.getKey(), e); |
| } |
| } |
| } |
| } |
| |
| |
| public void abortConsumer(Subscription sub, boolean abortSubscriberConnection) { |
| if (sub != null) { |
| SlowConsumerEntry entry = slowConsumers.remove(sub); |
| if (entry != null) { |
| Map toAbort = new HashMap<Subscription, SlowConsumerEntry>(); |
| toAbort.put(sub, entry); |
| abortSubscription(toAbort, abortSubscriberConnection); |
| } else { |
| LOG.warn("cannot abort subscription as it no longer exists in the map of slow consumers: " + sub); |
| } |
| } |
| } |
| |
| |
| public long getMaxSlowCount() { |
| return maxSlowCount; |
| } |
| |
| /** |
| * number of times a subscription can be deemed slow before triggering abort |
| * effect depends on dispatch rate as slow determination is done on dispatch |
| */ |
| public void setMaxSlowCount(long maxSlowCount) { |
| this.maxSlowCount = maxSlowCount; |
| } |
| |
| public long getMaxSlowDuration() { |
| return maxSlowDuration; |
| } |
| |
| /** |
| * time in milliseconds that a sub can remain slow before triggering |
| * an abort. |
| * @param maxSlowDuration |
| */ |
| public void setMaxSlowDuration(long maxSlowDuration) { |
| this.maxSlowDuration = maxSlowDuration; |
| } |
| |
| public long getCheckPeriod() { |
| return checkPeriod; |
| } |
| |
| /** |
| * time in milliseconds between checks for slow subscriptions |
| * @param checkPeriod |
| */ |
| public void setCheckPeriod(long checkPeriod) { |
| this.checkPeriod = checkPeriod; |
| } |
| |
| public boolean isAbortConnection() { |
| return abortConnection; |
| } |
| |
| /** |
| * abort the consumers connection rather than sending a stop command to the remote consumer |
| * @param abortConnection |
| */ |
| public void setAbortConnection(boolean abortConnection) { |
| this.abortConnection = abortConnection; |
| } |
| |
| public void setName(String name) { |
| this.name = name; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public Map<Subscription, SlowConsumerEntry> getSlowConsumers() { |
| return slowConsumers; |
| } |
| } |