/** | |
* 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.camel.component.exec; | |
import org.apache.commons.io.IOUtils; | |
import org.apache.commons.io.LineIterator; | |
/** | |
* A test Java main class to be executed. The behavior of the program is | |
* controlled by the arguments that the {@link #main(String[])} receives. Valid | |
* arguments are the public static fields of the class. | |
*/ | |
public class ExecutableJavaProgram { | |
/** | |
* Start 2 threads that print text in the stdout and stderr, each printing | |
* {@link #LINES_TO_PRINT_FROM_EACH_THREAD} lines. | |
*/ | |
public static final String THREADS = "threads"; | |
public static final String SLEEP_WITH_TIMEOUT = "timeout"; | |
public static final int SLEEP_TIME = 60 * 1000; | |
public static final String PRINT_IN_STDOUT = "print.in.stdout"; | |
public static final String PRINT_ARGS_STDOUT = "print.args.stdout"; | |
public static final String PRINT_IN_STDERR = "print.in.stderr"; | |
public static final String READ_INPUT_LINES_AND_PRINT_THEM = "read.input.lines.and.print.them"; | |
public static final int EXIT_WITH_VALUE_0 = 0; | |
public static final int EXIT_WITH_VALUE_1 = 1; | |
public static final int LINES_TO_PRINT_FROM_EACH_THREAD = 50; | |
protected ExecutableJavaProgram() { | |
} | |
public static void main(String[] args) throws Exception { | |
if (args == null || args.length == 0) { | |
throw new IllegalArgumentException("Empty args are not allowed."); | |
} | |
if (args[0].equals(PRINT_IN_STDOUT)) { | |
System.out.print(PRINT_IN_STDOUT); | |
System.exit(0); | |
} else if (args[0].equals(PRINT_ARGS_STDOUT)) { | |
for (int i = 0; i < args.length; i++) { | |
String arg = args[i]; | |
System.out.println(i + arg); | |
} | |
System.exit(0); | |
} else if (args[0].equals(PRINT_IN_STDERR)) { | |
System.err.print(PRINT_IN_STDERR); | |
System.exit(1); | |
} else if (args[0].equals(String.valueOf(EXIT_WITH_VALUE_0))) { | |
System.exit(0); | |
} else if (args[0].equals(String.valueOf(EXIT_WITH_VALUE_1))) { | |
System.exit(1); | |
} else if (args[0].equals(THREADS)) { | |
Thread stderrPrinterThread = new Thread(new ErrPrinter()); | |
Thread stdoutPrinterThread = new Thread(new OutPrinter()); | |
stderrPrinterThread.start(); | |
stdoutPrinterThread.start(); | |
stderrPrinterThread.join(); | |
stdoutPrinterThread.join(); | |
} else if (args[0].equals(SLEEP_WITH_TIMEOUT)) { | |
doSleep(); | |
System.exit(0); | |
} else if (READ_INPUT_LINES_AND_PRINT_THEM.equals(args[0])) { | |
LineIterator iterator = IOUtils.lineIterator(System.in, "UTF-8"); | |
while (iterator.hasNext()) { | |
String line = iterator.nextLine(); | |
System.out.println(line); | |
} | |
} else { | |
System.out.println(args[0]); | |
} | |
} | |
private static void doSleep() throws InterruptedException { | |
int sleepInterval = 50; | |
// Note, that sleeping in the main thread prevents the process from | |
// being destroyed for that time. The process is killed namely when | |
// sleep returns(observed on Windows XP) | |
int t = 0; | |
System.out.println("Sleeping every " + String.valueOf(sleepInterval) + " ms"); | |
for (; t < SLEEP_TIME % sleepInterval; t += sleepInterval) { | |
Thread.sleep(sleepInterval); | |
} | |
} | |
private static class ErrPrinter implements Runnable { | |
public void run() { | |
for (int t = 0; t < LINES_TO_PRINT_FROM_EACH_THREAD; t++) { | |
System.err.println(PRINT_IN_STDERR); | |
} | |
} | |
} | |
private static class OutPrinter implements Runnable { | |
public void run() { | |
for (int t = 0; t < LINES_TO_PRINT_FROM_EACH_THREAD; t++) { | |
System.out.println(PRINT_IN_STDOUT); | |
} | |
} | |
} | |
} |