    001    /*
    002     * Copyright (c) 2007-2014 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.flow.local.stream;
    022
    023    import cascading.flow.FlowElement;
    024    import cascading.flow.FlowProcess;
    025    import cascading.flow.stream.Duct;
    026    import cascading.flow.stream.MergeStage;
    027    import cascading.tuple.TupleEntry;
    028
    029    /** A version of Merge that synchronizes the receives for local mode */
    030    public class SyncMergeStage extends MergeStage
    031      {
    032      public SyncMergeStage( FlowProcess flowProcess, FlowElement flowElement )
    033        {
    034        super( flowProcess, flowElement );
    035        }
    036
    037      /**
    038       * synchronized, as by default, each source gets its turn, no concurrent threads. Except in local mode
    039       *
    040       * @param previous
    041       * @param tupleEntry
    042       */
    043      @Override
    044      public synchronized void receive( Duct previous, TupleEntry tupleEntry )
    045        {
    046        super.receive( previous, tupleEntry );
    047        }
    048      }