| /* |
| * 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.pig.impl.streaming; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.pig.PigToStream; |
| import org.apache.pig.PigException; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.streaming.StreamingCommand.HandleSpec; |
| |
| /** |
| * FileInputHandler handles the input for the Pig-Streaming |
| * executable in an asynchronous manner by feeding it input |
| * via an external file specified by the user. |
| */ |
| public class FileInputHandler extends InputHandler { |
| |
| OutputStream fileOutStream; |
| |
| public FileInputHandler(HandleSpec handleSpec) throws ExecException { |
| String fileName = handleSpec.name; |
| serializer = |
| (PigToStream) PigContext.instantiateFuncFromSpec(handleSpec.spec); |
| |
| try { |
| fileOutStream = new FileOutputStream(new File(fileName)); |
| super.bindTo(fileOutStream); |
| } catch (IOException fnfe) { |
| int errCode = 2046; |
| String msg = "Unable to create FileInputHandler."; |
| throw new ExecException(msg, errCode, PigException.BUG, fnfe); |
| } |
| } |
| |
| @Override |
| public InputType getInputType() { |
| return InputType.ASYNCHRONOUS; |
| } |
| |
| @Override |
| public void bindTo(OutputStream os) throws IOException { |
| throw new UnsupportedOperationException("Cannot call bindTo on " + |
| "FileInputHandler"); |
| } |
| |
| public synchronized void close(Process process) throws IOException { |
| super.close(process); |
| if (fileOutStream != null) { |
| fileOutStream.flush(); |
| fileOutStream.close(); |
| fileOutStream = null; |
| } |
| } |
| |
| } |