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  * JBoss, Home of Professional Open Source
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  * you may not use this file except in compliance with the License.
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.jboss.weld.executor;
Used for decomposition of loops in which independent tasks are processed sequentially. Based on the size of a thread pool, the factory creates an equal number of workers. Each worker iterates on a shared concurrent queue. The queue is created from the source items (iterable).

T the type of processed items
Jozef Hartinger
public abstract class IterativeWorkerTaskFactory<T> implements ExecutorServices.TaskFactory<Void> {
    private final Queue<T> queue;
    public IterativeWorkerTaskFactory(Iterable<? extends T> iterable) {
        this. = new ConcurrentLinkedQueue<T>();
    public List<Callable<Void>> createTasks(int threadPoolSize) {
        final int availableProcessors = Math.min(Runtime.getRuntime().availableProcessors(), threadPoolSize);
        List<Callable<Void>> tasks = new LinkedList<Callable<Void>>();
        for (int i = 0; i < availableProcessorsi++) {
            tasks.add(new Callable<Void>() {
                public Void call() throws Exception {
                    Thread thread = Thread.currentThread();
                    for (T i = .poll(); i != null && !thread.isInterrupted(); i = .poll()) {
                    return null;
        return tasks;

Called before the compilation begins.
    protected void init() {

Called after the computation finishes.
    protected void cleanup() {
    protected abstract void doWork(T item);
    public Queue<T> getQueue() {
        return ;
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