001    /*
002     * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003     *
004     * Project and contact information: http://www.cascading.org/
005     *
006     * This file is part of the Cascading project.
007     *
008     * Licensed under the Apache License, Version 2.0 (the "License");
009     * you may not use this file except in compliance with the License.
010     * You may obtain a copy of the License at
011     *
012     *     http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing, software
015     * distributed under the License is distributed on an "AS IS" BASIS,
016     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017     * See the License for the specific language governing permissions and
018     * limitations under the License.
019     */
020    
021    package cascading.management;
022    
023    import java.util.Collection;
024    import java.util.List;
025    import java.util.concurrent.Callable;
026    import java.util.concurrent.Future;
027    import java.util.concurrent.TimeUnit;
028    
029    /**
030     * The interface UnitOfWorkSpawnStrategy is a strategy for allowing pluggable thread management services into
031     * any {@link UnitOfWork} class.
032     * <p/>
033     * The default strategy is {@link UnitOfWorkExecutorStrategy}.
034     *
035     * @see UnitOfWork
036     * @see cascading.flow.Flow
037     * @see cascading.cascade.Cascade
038     */
039    public interface UnitOfWorkSpawnStrategy
040      {
041      List<Future<Throwable>> start( UnitOfWork unitOfWork, int maxConcurrentThreads, Collection<Callable<Throwable>> values ) throws InterruptedException;
042    
043      boolean isCompleted( UnitOfWork unitOfWork );
044    
045      void complete( UnitOfWork unitOfWork, int duration, TimeUnit unit ) throws InterruptedException;
046      }