/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed 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.uberfire.backend.server;
import java.util.Set;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.uberfire.backend.server.io.ConfigIOServiceProducer;
import org.uberfire.backend.server.util.Paths;
import org.uberfire.backend.vfs.PathFactory;
import org.uberfire.backend.vfs.impl.LockInfo;
import org.uberfire.io.IOService;
import org.uberfire.java.nio.file.FileSystem;
import org.uberfire.java.nio.file.NoSuchFileException;
import org.uberfire.java.nio.file.Path;
/**
* Releases locks on session end.
*/
@WebListener
public class LockCleanupSessionListener implements HttpSessionListener {
private static final Logger logger = LoggerFactory.getLogger(LockCleanupSessionListener.class);
@Override
public void sessionCreated(HttpSessionEvent se) {
}
@Override
public void sessionDestroyed(HttpSessionEvent se) {
final ConfigIOServiceProducer ioServiceProducer = ConfigIOServiceProducer.getInstance();
final IOService ioService = ioServiceProducer.configIOService();
final FileSystem fileSystem = ioServiceProducer.configFileSystem();
@SuppressWarnings("unchecked")
final Set<LockInfo> locks = (Set<LockInfo>) se.getSession()
.getAttribute(VFSLockServiceImpl.LOCK_SESSION_ATTRIBUTE_NAME);
if (locks != null) {
try {
ioService.startBatch(fileSystem);
for (LockInfo lock : locks) {
try {
final Path lockPath = Paths.convert(PathFactory.newLock(lock.getFile()));
// Lock could have change ownership due to a forced lock release
if (ioService.readAllString(lockPath).equals(lock.lockedBy())) {
ioService.delete(lockPath);
}
} catch (NoSuchFileException e) {
// Logging this with a lower level as it can happen when a user triggers
// a forced lock release or when the locked file itself was deleted.
logger.debug("Problem when releasing lock on session end (lock no longer exists): " + lock,
e);
} catch (Throwable t) {
logger.warn("Problem when releasing lock on session end: " + lock,
t);
}
}
} finally {
ioService.endBatch();
}
}
}
}