Java tutorial
/* * Copyright (c) 2011, Cloudera, Inc. All Rights Reserved. * * Cloudera, Inc. 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 * * This software 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 com.cloudera.hoop.fs; import com.cloudera.lib.io.IOUtils; import com.cloudera.lib.service.Hadoop; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; /** * Executor that performs an append Hadoop files system operation. */ public class FSAppend implements Hadoop.FileSystemExecutor<Void> { private InputStream is; private Path path; /** * Creates an Append executor. * @param is input stream to append. * @param path path of the file to append. */ public FSAppend(InputStream is, String path) { this.is = is; this.path = new Path(path); } /** * Executes the filesystem operation. * * @param fs filesystem instance to use. * @return void. * @throws IOException thrown if an IO error occured. */ @Override public Void execute(FileSystem fs) throws IOException { int bufferSize = fs.getConf().getInt("hoop.buffer.size", 4096); OutputStream os = fs.append(path, bufferSize); IOUtils.copy(is, os); os.close(); return null; } }