core/src/org/apache/pivot/util/concurrent/TaskGroup.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pivot.util.concurrent;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutorService;

/**
 * Abstract base class for task groups.
 */
public abstract class TaskGroup extends Task<Void> {
    protected int complete = 0;
    protected ArrayList<Task<?>> tasks = new ArrayList<Task<?>>();

    public TaskGroup() {
        this(DEFAULT_EXECUTOR_SERVICE);
    }

    public TaskGroup(ExecutorService executorService) {
        super(executorService);
    }

    public synchronized List<Task<?>> getTasks() {
        return isPending() ? Collections.unmodifiableList(tasks) : tasks;
    }
}