1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.chukwa.datacollection.writer; 20 21 import java.util.List; 22 import org.apache.hadoop.chukwa.Chunk; 23 24 25 public abstract class PipelineableWriter implements ChukwaWriter { 26 protected ChukwaWriter next; 27 public void setNextStage(ChukwaWriter next) { 28 this.next = next; 29 } 30 31 public CommitStatus add(List<Chunk> chunks) throws WriterException { 32 if (next != null) 33 return next.add(chunks); //pass data through 34 else 35 return ChukwaWriter.COMMIT_OK; 36 } 37 38 39 }