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DatabaseThread.java
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DatabaseThread.java
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/*
* Copyright 2011 Tyler Blair. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and contributors and should not be interpreted as representing official policies,
* either expressed or implied, of anybody else.
*/
package com.griefcraft.util;
import com.griefcraft.lwc.LWC;
import com.griefcraft.model.Protection;
import com.griefcraft.sql.Database;
import java.util.Iterator;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;
public class DatabaseThread implements Runnable {
/**
* The LWC object
*/
private final LWC lwc;
/**
* The protections waiting to be updated in the database
*/
private final Queue<Protection> updateQueue = new LinkedBlockingQueue<Protection>();
/**
* The thread we are running in
*/
private final Thread thread = new Thread(this);
/**
* If the database thread is active and running
*/
private boolean running = false;
/**
* The last time the queue was flushed to the database
*/
private long lastFlush = -1L;
public DatabaseThread(LWC lwc) {
this.lwc = lwc;
this.running = true;
this.lastFlush = System.currentTimeMillis();
this.thread.start();
}
/**
* Adds a protection to the update queue so that it is flushed to the database asap
*
* @param protection
*/
public void addProtection(Protection protection) {
updateQueue.offer(protection);
}
/**
* Removes a protection from the update queue
*
* @param protection
*/
public void removeProtection(Protection protection) {
updateQueue.remove(protection);
}
/**
* Gets the current amount of protections queued to be updated
*
* @return the amount of protections queued to be updated
*/
public int size() {
return updateQueue.size();
}
/**
* Stop the database thread
*/
public void stop() {
// stop running and interrupt the thread
running = false;
if (!thread.isInterrupted()) {
thread.interrupt();
}
// Flush the rest of the entries
flushDatabase();
}
/**
* Recommend a flush as soon as possible. This does not guarantee the database will be flushed immediately.
*/
public void flush() {
lastFlush = System.currentTimeMillis() - 9999999L;
}
/**
* Flush the protections to the database
*/
private void flushDatabase() {
if (!updateQueue.isEmpty()) {
synchronized (updateQueue) {
Database database = lwc.getPhysicalDatabase();
database.setAutoCommit(false);
// Begin iterating through the queue
Iterator<Protection> iter = updateQueue.iterator();
while (iter.hasNext()) {
Protection protection = iter.next();
iter.remove();
protection.saveNow();
}
// Commit the changes to the database
database.setAutoCommit(true);
}
}
// update the time we last flushed at
lastFlush = System.currentTimeMillis();
}
public void run() {
while (running) {
// how many seconds between each flush
int interval = lwc.getConfiguration().getInt("core.flushInterval", 5);
long currentTime = System.currentTimeMillis();
long intervalMilliseconds = interval * 1000L;
// compare the current time to the last flush
if (currentTime - lastFlush > intervalMilliseconds) {
flushDatabase();
}
try {
Thread.sleep(1000L);
} catch (InterruptedException e) {
running = false;
}
}
}
}