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package com.orbekk.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A WorkList is a list for pending units of work.
*/
abstract public class WorkQueue<E> extends Thread implements List<E> {
private Logger logger = LoggerFactory.getLogger(getClass());
private volatile List<E> list = null;
private volatile boolean done = false;
public WorkQueue() {
list = new ArrayList<E>();
}
public WorkQueue(Collection<? extends E> collection) {
list = new ArrayList<E>(collection);
}
public synchronized List<E> getAndClear() {
List<E> copy = new ArrayList<E>(list);
list.clear();
return copy;
}
/**
* OnChange event.
*
* May be run even if the WorkQueue has not been changed.
* Called until the queue is empty.
*/
protected abstract void onChange();
/**
* Perform work until the queue is empty.
*
* Can be used for testing or for combining several WorkQueues in
* a single thread.
*/
public synchronized void performWork() {
while (!isEmpty()) {
onChange();
}
}
@Override
public void run() {
while (!done) {
if (!isEmpty()) {
onChange();
}
synchronized (this) {
try {
if (isEmpty()) {
wait();
}
} catch (InterruptedException e) {
done = true;
}
if (Thread.interrupted()) {
done = true;
}
}
}
}
@Override
public synchronized boolean add(E e) {
notifyAll();
return list.add(e);
}
@Override
public synchronized void add(int index, E element) {
notifyAll();
list.add(index, element);
}
@Override
public synchronized boolean addAll(Collection<? extends E> c) {
notifyAll();
return list.addAll(c);
}
@Override
public synchronized boolean addAll(int index, Collection<? extends E> c) {
notifyAll();
return list.addAll(index, c);
}
@Override
public synchronized void clear() {
notifyAll();
list.clear();
}
@Override
public synchronized boolean contains(Object o) {
notifyAll();
return list.contains(o);
}
@Override
public synchronized boolean containsAll(Collection<?> c) {
notifyAll();
return containsAll(c);
}
@Override
public synchronized E get(int index) {
notifyAll();
return list.get(index);
}
@Override
public synchronized int indexOf(Object o) {
notifyAll();
return list.indexOf(o);
}
@Override
public synchronized boolean isEmpty() {
notifyAll();
return list.isEmpty();
}
@Override
public synchronized Iterator<E> iterator() {
notifyAll();
return list.iterator();
}
@Override
public synchronized int lastIndexOf(Object o) {
notifyAll();
return list.lastIndexOf(o);
}
@Override
public synchronized ListIterator<E> listIterator() {
notifyAll();
return list.listIterator();
}
@Override
public synchronized ListIterator<E> listIterator(int index) {
notifyAll();
return list.listIterator(index);
}
@Override
public synchronized boolean remove(Object o) {
notifyAll();
return list.remove(o);
}
@Override
public synchronized E remove(int index) {
notifyAll();
return list.remove(index);
}
@Override
public synchronized boolean removeAll(Collection<?> c) {
notifyAll();
return list.removeAll(c);
}
@Override
public synchronized boolean retainAll(Collection<?> c) {
notifyAll();
return list.retainAll(c);
}
@Override
public synchronized E set(int index, E element) {
notifyAll();
return list.set(index, element);
}
@Override
public synchronized int size() {
notifyAll();
return list.size();
}
@Override
public synchronized List<E> subList(int fromIndex, int toIndex) {
notifyAll();
return list.subList(fromIndex, toIndex);
}
@Override
public synchronized Object[] toArray() {
notifyAll();
return list.toArray();
}
@Override
public synchronized <T> T[] toArray(T[] a) {
notifyAll();
return list.toArray(a);
}
}
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