org.mycore.frontend.support.MCRObjectIDLockTable Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.frontend.support;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.common.MCRSession;
import org.mycore.common.MCRSessionMgr;
import org.mycore.common.events.MCRSessionEvent;
import org.mycore.common.events.MCRSessionListener;
import org.mycore.datamodel.metadata.MCRObjectID;
public class MCRObjectIDLockTable implements MCRSessionListener {
private static final MCRObjectIDLockTable SINGLETON = new MCRObjectIDLockTable();
private static Logger LOGGER = LogManager.getLogger(MCRObjectIDLockTable.class);
private ConcurrentMap lockMap;
private static MCRObjectIDLockTable getInstance() {
return SINGLETON;
}
private MCRObjectIDLockTable() {
this.lockMap = new ConcurrentHashMap<>();
MCRSessionMgr.addSessionListener(this);
}
public void clearTable(MCRSession session) {
for (MCRObjectID objectID : lockMap.keySet()) {
lockMap.remove(objectID, session);
}
}
public static void unlock(MCRObjectID objectId) {
getInstance().lockMap.remove(objectId);
}
public static void lock(MCRObjectID objectId) {
getInstance().lockMap.putIfAbsent(objectId, MCRSessionMgr.getCurrentSession());
}
public static boolean isLockedByCurrentSession(MCRObjectID objectId) {
MCRSession session = MCRSessionMgr.getCurrentSession();
return session.equals(getInstance().lockMap.get(objectId));
}
public static MCRSession getLocker(MCRObjectID objectId) {
return getInstance().lockMap.get(objectId);
}
@Override
public void sessionEvent(MCRSessionEvent event) {
switch (event.getType()) {
case destroyed:
clearTable(event.getSession());
break;
default:
LOGGER.debug("Skipping event: {}", event.getType());
break;
}
}
public static boolean isLockedByCurrentSession(String objectId) {
MCRObjectID objId = MCRObjectID.getInstance(objectId);
return MCRObjectIDLockTable.isLockedByCurrentSession(objId);
}
public static String getLockingUserName(String objectId) {
MCRObjectID objId = MCRObjectID.getInstance(objectId);
MCRSession locker = MCRObjectIDLockTable.getLocker(objId);
if (locker == null) {
return null;
}
return locker.getUserInformation().getUserID();
}
}