001/* 002 * Copyright (C) 2014 Jörg Prante 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.xbib.elasticsearch.plugin.jdbc.feeder; 017 018import java.io.InputStreamReader; 019import java.io.OutputStreamWriter; 020 021/** 022 * Stub for loading a Java class and execute it. Isolating the main method from other methods is of advantage 023 * for JVMs that thoroughly check if the class can be executed. 024 */ 025public class Runner { 026 027 public static void main(String[] args) { 028 try { 029 // here we load the "concrete" class we want to execute. Add shutdown hook and pass stdin/stdio/stderr. 030 Class clazz = Class.forName(args[0]); 031 CommandLineInterpreter commandLineInterpreter = (CommandLineInterpreter) clazz.newInstance(); 032 Runtime.getRuntime().addShutdownHook(commandLineInterpreter.shutdownHook()); 033 commandLineInterpreter.readFrom(new InputStreamReader(System.in, "UTF-8")) 034 .writeTo(new OutputStreamWriter(System.out, "UTF-8")) 035 .errorsTo(System.err) 036 .start(); 037 } catch (Throwable e) { 038 // ensure fatal errors are printed to stderr 039 e.printStackTrace(); 040 System.exit(1); 041 } 042 System.exit(0); 043 } 044}