org.apache.activemq.artemis.core.server.impl.AnyLiveNodeLocatorForReplication Maven / Gradle / Ivy
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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.artemis.core.server.impl;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.activemq.artemis.api.core.ActiveMQException;
import org.apache.activemq.artemis.api.core.Pair;
import org.apache.activemq.artemis.api.core.TransportConfiguration;
import org.apache.activemq.artemis.api.core.client.TopologyMember;
import org.apache.activemq.artemis.core.server.LiveNodeLocator;
import org.apache.activemq.artemis.utils.ConcurrentUtil;
/**
* This implementation looks for any available live node, once tried with no success it is marked as
* tried and the next available is used.
*/
public class AnyLiveNodeLocatorForReplication extends LiveNodeLocator {
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private final ActiveMQServerImpl server;
private final long retryReplicationWait;
Map> untriedConnectors = new HashMap<>();
Map> triedConnectors = new HashMap<>();
private String nodeID;
public AnyLiveNodeLocatorForReplication(BackupRegistrationListener backupRegistrationListener,
ActiveMQServerImpl server, long retryReplicationWait) {
super(backupRegistrationListener);
this.server = server;
this.retryReplicationWait = retryReplicationWait;
}
@Override
public void locateNode() throws ActiveMQException {
locateNode(-1L);
}
@Override
public void locateNode(long timeout) throws ActiveMQException {
//first time
try {
lock.lock();
if (untriedConnectors.isEmpty()) {
try {
if (timeout != -1L) {
ConcurrentUtil.await(condition, timeout);
} else {
while (untriedConnectors.isEmpty()) {
condition.await(retryReplicationWait, TimeUnit.MILLISECONDS);
untriedConnectors.putAll(triedConnectors);
triedConnectors.clear();
}
}
} catch (InterruptedException e) {
}
}
} finally {
lock.unlock();
}
}
@Override
public void nodeUP(TopologyMember topologyMember, boolean last) {
try {
lock.lock();
Pair connector = new Pair<>(topologyMember.getLive(), topologyMember.getBackup());
if (server.checkLiveIsNotColocated(topologyMember.getNodeId())) {
untriedConnectors.put(topologyMember.getNodeId(), connector);
condition.signal();
}
} finally {
lock.unlock();
}
}
/**
* if a node goes down we try all the connectors again as one may now be available for
* replication
*
* TODO: there will be a better way to do this by finding which nodes backup has gone down.
*/
@Override
public void nodeDown(long eventUID, String nodeID) {
try {
lock.lock();
untriedConnectors.putAll(triedConnectors);
triedConnectors.clear();
if (untriedConnectors.size() > 0) {
condition.signal();
}
} finally {
lock.unlock();
}
}
@Override
public String getNodeID() {
return nodeID;
}
@Override
public Pair getLiveConfiguration() {
try {
lock.lock();
Iterator iterator = untriedConnectors.keySet().iterator();
//sanity check but this should never happen
if (iterator.hasNext()) {
nodeID = iterator.next();
}
return untriedConnectors.get(nodeID);
} finally {
lock.unlock();
}
}
@Override
public void notifyRegistrationFailed(boolean alreadyReplicating) {
try {
lock.lock();
Pair tc = untriedConnectors.remove(nodeID);
//it may have been removed
if (tc != null) {
triedConnectors.put(nodeID, tc);
}
} finally {
lock.unlock();
}
super.notifyRegistrationFailed(alreadyReplicating);
}
}