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.hoop.HoopServer; 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; /** * Executor that performs a open Hadoop files system operation. */ public class FSOpen implements Hadoop.FileSystemExecutor<InputStream> { private Path path; /** * Creates a open executor. * * @param path file to open. */ public FSOpen(String path) { this.path = new Path(path); } /** * Executes the filesystem operation. * * @param fs filesystem instance to use. * @return The inputstream of the file. * @throws IOException thrown if an IO error occured. */ @Override public InputStream execute(FileSystem fs) throws IOException { int bufferSize = HoopServer.get().getConfig().getInt("hoop.buffer.size", 4096); return fs.open(path, bufferSize); } }