/* Copyright (c) 2014 Jesper Öqvist <jesper@llbit.se>
*
* This file is part of Chunky.
*
* Chunky 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.
*
* Chunky 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 Chunky. If not, see <http://www.gnu.org/licenses/>.
*/
package se.llbit.chunky.world;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
/**
* Renders topography layer for chunks on demand.
*
* @author Jesper Öqvist (jesper@llbit.se)
*/
public class ChunkTopographyUpdater extends Thread {
private final Set<Chunk> queue = new HashSet<>();
/**
* Create new chunk parser
*/
public ChunkTopographyUpdater() {
super("Chunk Topography Updater");
}
@Override public void run() {
try {
while (!isInterrupted()) {
Chunk chunk = getNext();
chunk.renderTopography();
}
} catch (InterruptedException e) {
}
}
/**
* Get next chunk from the parse queue
*
* @throws InterruptedException
*/
private synchronized Chunk getNext() throws InterruptedException {
while (queue.isEmpty()) {
wait();
}
Iterator<Chunk> iter = queue.iterator();
Chunk chunk = iter.next();
iter.remove();
return chunk;
}
/**
* Add a chunk to the parse queue.
*/
public synchronized void addChunk(Chunk chunk) {
queue.add(chunk);
notify();
}
/**
* @return <code>true</code> if the work queue is not empty
*/
public synchronized boolean isWorking() {
// TODO: add loading indicator.
return !queue.isEmpty();
}
}