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.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 }