org.apache.activemq.artemis.core.server.NodeManager 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;
import java.util.HashSet;
import java.util.Set;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.core.server.impl.FileLockNodeManager;
import org.apache.activemq.artemis.utils.UUID;
import org.jboss.logging.Logger;
public abstract class NodeManager implements ActiveMQComponent {
@FunctionalInterface
public interface LockListener {
void lostLock();
}
private static final Logger LOGGER = Logger.getLogger(NodeManager.class);
protected final boolean replicatedBackup;
protected final Object nodeIDGuard = new Object();
private SimpleString nodeID;
private UUID uuid;
private boolean isStarted = false;
private final Set lockListeners;
protected long nodeActivationSequence; // local version of a coordinated sequence, tracking state transitions of ownership
public NodeManager(final boolean replicatedBackup) {
this.replicatedBackup = replicatedBackup;
this.lockListeners = new HashSet<>();
}
// --------------------------------------------------------------------
public abstract void awaitLiveNode() throws NodeManagerException, InterruptedException;
public abstract void awaitLiveStatus() throws NodeManagerException, InterruptedException;
public abstract void startBackup() throws NodeManagerException, InterruptedException;
public abstract ActivateCallback startLiveNode() throws NodeManagerException, InterruptedException;
public abstract void pauseLiveServer() throws NodeManagerException;
public abstract void crashLiveServer() throws NodeManagerException;
public abstract void releaseBackup() throws NodeManagerException;
// --------------------------------------------------------------------
@Override
public synchronized void start() throws Exception {
isStarted = true;
}
@Override
public boolean isStarted() {
return isStarted;
}
public SimpleString getNodeId() {
synchronized (nodeIDGuard) {
return nodeID;
}
}
public long readNodeActivationSequence() throws NodeManagerException {
// TODO make it abstract
throw new UnsupportedOperationException("TODO");
}
public void writeNodeActivationSequence(long version) throws NodeManagerException {
// TODO make it abstract
throw new UnsupportedOperationException("TODO");
}
public abstract SimpleString readNodeId() throws NodeManagerException;
public long getNodeActivationSequence() {
synchronized (nodeIDGuard) {
return nodeActivationSequence;
}
}
public void setNodeActivationSequence(long activationSequence) {
synchronized (nodeIDGuard) {
nodeActivationSequence = activationSequence;
}
}
public UUID getUUID() {
synchronized (nodeIDGuard) {
return uuid;
}
}
/**
* Sets the nodeID.
*
* Only used by replicating backups.
*
* @param nodeID
*/
public void setNodeID(String nodeID) {
synchronized (nodeIDGuard) {
this.nodeID = new SimpleString(nodeID);
this.uuid = new UUID(UUID.TYPE_TIME_BASED, UUID.stringToBytes(nodeID));
}
}
/**
* @param generateUUID
*/
protected void setUUID(UUID generateUUID) {
synchronized (nodeIDGuard) {
uuid = generateUUID;
nodeID = new SimpleString(uuid.toString());
}
}
public abstract boolean isAwaitingFailback() throws NodeManagerException;
public abstract boolean isBackupLive() throws NodeManagerException;
public abstract void interrupt();
@Override
public synchronized void stop() throws Exception {
// force any running threads on node manager to stop
isStarted = false;
lockListeners.clear();
}
public void stopBackup() throws NodeManagerException {
releaseBackup();
}
protected synchronized void checkStarted() {
if (!isStarted) {
throw new IllegalStateException("the node manager is supposed to be started");
}
}
protected synchronized void notifyLostLock() {
if (!isStarted) {
return;
}
lockListeners.forEach(lockListener -> {
try {
lockListener.lostLock();
} catch (Exception e) {
LOGGER.warn("On notify lost lock", e);
// Need to notify everyone so ignore any exception
}
});
}
public synchronized void registerLockListener(FileLockNodeManager.LockListener lockListener) {
lockListeners.add(lockListener);
}
public synchronized void unregisterLockListener(FileLockNodeManager.LockListener lockListener) {
lockListeners.remove(lockListener);
}
public static final class NodeManagerException extends RuntimeException {
public NodeManagerException(String message) {
super(message);
}
public NodeManagerException(Throwable cause) {
super(cause);
}
public NodeManagerException(String message, Throwable cause) {
super(message, cause);
}
}
}