| /** |
| * 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.hcatalog.templeton.tool; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Execute a local program. This is a singleton service that will |
| * execute a programs on the local box. |
| */ |
| public class TrivialExecService { |
| private static volatile TrivialExecService theSingleton; |
| |
| /** |
| * Retrieve the singleton. |
| */ |
| public static synchronized TrivialExecService getInstance() { |
| if (theSingleton == null) |
| theSingleton = new TrivialExecService(); |
| return theSingleton; |
| } |
| |
| public Process run(List<String> cmd, List<String> removeEnv, |
| Map<String, String> environmentVariables) |
| throws IOException |
| { |
| System.err.println("templeton: starting " + cmd); |
| System.err.print("With environment variables: " ); |
| for(Map.Entry<String, String> keyVal : environmentVariables.entrySet()){ |
| System.err.println(keyVal.getKey() + "=" + keyVal.getValue()); |
| } |
| ProcessBuilder pb = new ProcessBuilder(cmd); |
| for (String key : removeEnv) |
| pb.environment().remove(key); |
| pb.environment().putAll(environmentVariables); |
| return pb.start(); |
| } |
| |
| } |