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/*
 * 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.tuscany.sca.work;

import java.util.concurrent.ExecutorService;

/**
 * Defines the contract for scheduling asynchronous units of work.
 *
 * 
 * Units of work can be scheduled with an optional NotificationListener.
 * If a notification listener is specified, the caller will be notified regarding the
 * status of the work. The unit of work can either be completed, rejected or completed
 * with an error. If the work completed with an error, the caller is notified with the
 * error details.
 * 
 *
 * @version $Rev: 998309 $ $Date: 2010-09-17 23:37:49 +0300 (Fri, 17 Sep 2010) $
 * @tuscany.spi.extension.asclient
 */
public interface WorkScheduler {

    /**
     * Schedules a unit of work for future execution. The notification listener
     * is used to register interest in callbacks regarding the status of the work.
     *
     * @param work The unit of work that needs to be asynchronously executed.
     * @param listener Notification listener for callbacks.
     */
    void scheduleWork(T work, NotificationListener listener);

    /**
     * Schedules a unit of work for future execution. The notification listener
     * is used to register interest in callbacks regarding the status of the work.
     *
     * @param work The unit of work that needs to be asynchronously executed.
     */
    void scheduleWork(T work);
    
    /**
     * Get the underlying getExecutorService
     * @return
     */
    ExecutorService getExecutorService();

}