TaskManagerFactory.java

/*
 * Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.jboss.errai.common.client.api.tasks;

public class TaskManagerFactory {

  private static final Object lock = new Object();
  private static volatile TaskManagerProvider provider;

  public static TaskManager get() {
    synchronized (lock) {
      if (provider == null) {
        _initForClient();
      }
      return provider.get();
    }

  }

  private static void _initForClient() {
    provider = new TaskManagerProvider() {
      private ClientTaskManager taskManager = new ClientTaskManager();

      public TaskManager get() {
        return taskManager;
      }
    };
  }

  public static void setTaskManagerProvider(TaskManagerProvider p) {
    synchronized (lock) {
      if (provider == null) {
        // Attempt to initialize the task manager twice. Will be ignored
        provider = p;
      }
    }
  }
}