| /** |
| * 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.sqoop.util; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Runs a process via Runtime.exec() and allows handling of stdout/stderr to be |
| * deferred to other threads. |
| * |
| */ |
| public final class Executor { |
| |
| public static final Log LOG = LogFactory.getLog(Executor.class.getName()); |
| |
| private Executor() { |
| } |
| |
| /** |
| * Execute a program defined by the args array with default stream sinks |
| * that consume the program's output (to prevent it from blocking on buffers) |
| * and then ignore said output. |
| */ |
| public static int exec(String [] args) throws IOException { |
| NullAsyncSink s = new NullAsyncSink(); |
| return exec(args, s, s); |
| } |
| |
| /** |
| * Run a command via Runtime.exec(), with its stdout and stderr streams |
| * directed to be handled by threads generated by AsyncSinks. |
| * Block until the child process terminates. |
| * |
| * @return the exit status of the ran program |
| */ |
| public static int exec(String [] args, AsyncSink outSink, |
| AsyncSink errSink) throws IOException { |
| return exec(args, null, outSink, errSink); |
| } |
| |
| |
| /** |
| * Run a command via Runtime.exec(), with its stdout and stderr streams |
| * directed to be handled by threads generated by AsyncSinks. |
| * Block until the child process terminates. Allows the programmer to |
| * specify an environment for the child program. |
| * |
| * @return the exit status of the ran program |
| */ |
| public static int exec(String [] args, String [] envp, AsyncSink outSink, |
| AsyncSink errSink) throws IOException { |
| |
| // launch the process. |
| Process p = Runtime.getRuntime().exec(args, envp); |
| |
| // dispatch its stdout and stderr to stream sinks if available. |
| if (null != outSink) { |
| outSink.processStream(p.getInputStream()); |
| } |
| |
| if (null != errSink) { |
| errSink.processStream(p.getErrorStream()); |
| } |
| |
| // wait for the return value. |
| while (true) { |
| try { |
| int ret = p.waitFor(); |
| return ret; |
| } catch (InterruptedException ie) { |
| continue; |
| } |
| } |
| } |
| |
| |
| /** |
| * @return An array formatted correctly for use as an envp based on the |
| * current environment for this program. |
| */ |
| public static List<String> getCurEnvpStrings() { |
| Map<String, String> curEnv = System.getenv(); |
| ArrayList<String> array = new ArrayList<String>(); |
| |
| if (null == curEnv) { |
| return null; |
| } |
| |
| for (Map.Entry<String, String> entry : curEnv.entrySet()) { |
| array.add(entry.getKey() + "=" + entry.getValue()); |
| } |
| |
| return array; |
| } |
| |
| } |