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UpdateThread.java
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UpdateThread.java
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/**
* This file is part of LWC (https://github.com/Hidendra/LWC)
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.griefcraft.util;
import com.griefcraft.lwc.LWC;
import com.griefcraft.model.Protection;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
public class UpdateThread implements Runnable {
/**
* Queue that protections can be added to to update them in the database periodically in a seperate thread
*/
private Map<Integer, Protection> protectionUpdateQueue = Collections.synchronizedMap(new HashMap<Integer, Protection>());
/**
* True begins the flush
*/
private boolean flush = false;
/**
* The last update
*/
private long lastUpdate = -1L;
private Logger logger = Logger.getLogger("Cache");
/**
* The LWC object
*/
private LWC lwc;
/**
* If the update thread is running
*/
private boolean running = false;
/**
* Thread being used
*/
private Thread thread;
public UpdateThread(LWC lwc) {
this.lwc = lwc;
running = true;
lastUpdate = System.currentTimeMillis();
thread = new Thread(this);
thread.start();
}
/**
* Activate flushing
*/
public void flush() {
_flush();
}
/**
* @return the size of the waiting queue
*/
public int size() {
return protectionUpdateQueue.size();
}
/**
* Add a protection to be updated to the top of the queue (JUST block ids!!)
*
* @param protection
*/
public void queueProtectionUpdate(Protection protection) {
protectionUpdateQueue.put(protection.getId(), protection);
}
/**
* Unqueue a protection to be updated to the database if it's already queued
*
* @param protection
*/
public void unqueueProtectionUpdate(Protection protection) {
if(protectionUpdateQueue.containsKey(protection.getId())) {
protectionUpdateQueue.remove(protection.getId());
}
}
public void run() {
while (running) {
if (flush) {
_flush();
continue;
}
int flushInterval = lwc.getConfiguration().getInt("core.flushInterval", 5);
long curr = System.currentTimeMillis();
long interval = flushInterval * 1000L;
if (curr - lastUpdate > interval) {
flush = true;
}
try {
Thread.sleep(1000L);
} catch (Exception e) {
}
}
}
/**
* Stop the update thread. Also flush the remaining updates since we're stopping anyway
*/
public void stop() {
running = false;
_flush();
if (thread != null && !thread.isInterrupted()) {
thread.interrupt();
}
}
/**
* Flush any caches to the database
*/
private void _flush() {
// periodically update protections in the database if a non-critical change was made
if (protectionUpdateQueue.size() > 0) {
Connection connection = lwc.getPhysicalDatabase().getConnection();
try {
connection.setAutoCommit(false);
} catch (SQLException e) {
e.printStackTrace();
}
// save all of the protections
for(Map.Entry<Integer, Protection> entry : protectionUpdateQueue.entrySet()) {
Protection protection = entry.getValue();
protection.saveNow();
}
// clear the queue
protectionUpdateQueue.clear();
// commit
try {
connection.commit();
connection.setAutoCommit(true);
} catch (SQLException e) {
e.printStackTrace();
}
}
flush = false;
lastUpdate = System.currentTimeMillis();
}
}