/**
* 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.cli.commands.tools;
import java.io.File;
import java.io.RandomAccessFile;
import java.nio.channels.FileLock;
import java.nio.channels.OverlappingFileLockException;
import org.apache.activemq.artemis.cli.CLIException;
import org.apache.activemq.artemis.cli.commands.ActionContext;
public abstract class LockAbstract extends DataAbstract {
// There should be one lock per VM
// These will be locked as long as the VM is running
private static RandomAccessFile serverLockFile = null;
private static FileLock serverLockLock = null;
public static void unlock() {
try {
if (serverLockFile != null) {
serverLockFile.close();
serverLockFile = null;
}
if (serverLockLock != null) {
serverLockLock.close();
serverLockLock = null;
}
} catch (Exception ignored) {
}
}
@Override
public Object execute(ActionContext context) throws Exception {
super.execute(context);
if (getBrokerInstance() == null) {
System.err.println("Warning: You are running a data tool outside of any broker instance. Modifying data on a running server might break the server's data");
System.err.println();
} else {
lockCLI(getLockPlace());
}
return null;
}
void lockCLI(File lockPlace) throws Exception {
if (lockPlace != null) {
lockPlace.mkdirs();
if (serverLockFile == null) {
File fileLock = new File(lockPlace, "cli.lock");
serverLockFile = new RandomAccessFile(fileLock, "rw");
}
try {
FileLock lock = serverLockFile.getChannel().tryLock();
if (lock == null) {
throw new CLIException("Error: There is another process using the server at " + lockPlace + ". Cannot start the process!");
}
serverLockLock = lock;
} catch (OverlappingFileLockException e) {
throw new CLIException("Error: There is another process using the server at " + lockPlace + ". Cannot start the process!");
}
}
}
private File getLockPlace() throws Exception {
String brokerInstance = getBrokerInstance();
if (brokerInstance != null) {
return new File(new File(brokerInstance), "lock");
} else {
return null;
}
}
}