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Quartz Enterprise Job Scheduler - additional library of ready to use Jobs
/*
* All content copyright Terracotta, Inc., unless otherwise indicated. All rights reserved.
*
* Licensed 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.quartz.jobs;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
/**
* Built in job for executing native executables in a separate process.
*
*
* JobDetail job = new JobDetail("dumbJob", null, org.quartz.jobs.NativeJob.class);
* job.getJobDataMap().put(org.quartz.jobs.NativeJob.PROP_COMMAND, "echo \"hi\" >> foobar.txt");
* Trigger trigger = TriggerUtils.makeSecondlyTrigger(5);
* trigger.setName("dumbTrigger");
* sched.scheduleJob(job, trigger);
*
*
* If PROP_WAIT_FOR_PROCESS is true, then the Integer exit value of the process
* will be saved as the job execution result in the JobExecutionContext.
*
* @see #PROP_COMMAND
* @see #PROP_PARAMETERS
* @see #PROP_WAIT_FOR_PROCESS
* @see #PROP_CONSUME_STREAMS
*
* @author Matthew Payne
* @author James House
* @author Steinar Overbeck Cook
*/
public class NativeJob implements Job {
private final Logger log = LoggerFactory.getLogger(getClass());
/*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Constants.
*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
/**
* Required parameter that specifies the name of the command (executable)
* to be ran.
*/
public static final String PROP_COMMAND = "command";
/**
* Optional parameter that specifies the parameters to be passed to the
* executed command.
*/
public static final String PROP_PARAMETERS = "parameters";
/**
* Optional parameter (value should be 'true' or 'false') that specifies
* whether the job should wait for the execution of the native process to
* complete before it completes.
*
* Defaults to true.
*/
public static final String PROP_WAIT_FOR_PROCESS = "waitForProcess";
/**
* Optional parameter (value should be 'true' or 'false') that specifies
* whether the spawned process's stdout and stderr streams should be
* consumed. If the process creates output, it is possible that it might
* 'hang' if the streams are not consumed.
*
* Defaults to false.
*/
public static final String PROP_CONSUME_STREAMS = "consumeStreams";
/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Interface.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
public void execute(JobExecutionContext context)
throws JobExecutionException {
JobDataMap data = context.getMergedJobDataMap();
String command = data.getString(PROP_COMMAND);
String parameters = data.getString(PROP_PARAMETERS);
if (parameters == null) {
parameters = "";
}
boolean wait = true;
if(data.containsKey(PROP_WAIT_FOR_PROCESS)) {
wait = data.getBooleanValue(PROP_WAIT_FOR_PROCESS);
}
boolean consumeStreams = false;
if(data.containsKey(PROP_CONSUME_STREAMS)) {
consumeStreams = data.getBooleanValue(PROP_CONSUME_STREAMS);
}
Integer exitCode = this.runNativeCommand(command, parameters, wait, consumeStreams);
context.setResult(exitCode);
}
protected Logger getLog() {
return log;
}
private Integer runNativeCommand(String command, String parameters, boolean wait, boolean consumeStreams) throws JobExecutionException {
String[] cmd;
String[] args = new String[2];
Integer result = null;
args[0] = command;
args[1] = parameters;
try {
//with this variable will be done the swithcing
String osName = System.getProperty("os.name");
// specific for Windows
if (osName.startsWith("Windows")) {
cmd = new String[args.length + 2];
if (osName.equals("Windows 95")) { // windows 95 only
cmd[0] = "command.com";
} else {
cmd[0] = "cmd.exe";
}
cmd[1] = "/C";
System.arraycopy(args, 0, cmd, 2, args.length);
} else if (osName.equals("Linux")) {
cmd = new String[3];
cmd[0] = "/bin/sh";
cmd[1] = "-c";
cmd[2] = args[0] + " " + args[1];
} else { // try this...
cmd = args;
}
Runtime rt = Runtime.getRuntime();
// Executes the command
getLog().info("About to run " + cmd[0] + " " + cmd[1] + " " + (cmd.length>2 ? cmd[2] : "") + " ...");
Process proc = rt.exec(cmd);
// Consumes the stdout from the process
StreamConsumer stdoutConsumer = new StreamConsumer(proc.getInputStream(), "stdout");
// Consumes the stderr from the process
if(consumeStreams) {
StreamConsumer stderrConsumer = new StreamConsumer(proc.getErrorStream(), "stderr");
stdoutConsumer.start();
stderrConsumer.start();
}
if(wait) {
result = proc.waitFor();
}
// any error message?
} catch (Throwable x) {
throw new JobExecutionException("Error launching native command: ", x, false);
}
return result;
}
/**
* Consumes data from the given input stream until EOF and prints the data to stdout
*
* @author cooste
* @author jhouse
*/
class StreamConsumer extends Thread {
InputStream is;
String type;
/**
*
*/
public StreamConsumer(InputStream inputStream, String type) {
this.is = inputStream;
this.type = type;
}
/**
* Runs this object as a separate thread, printing the contents of the InputStream
* supplied during instantiation, to either stdout or stderr
*/
@Override
public void run() {
BufferedReader br = null;
try {
br = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = br.readLine()) != null) {
if(type.equalsIgnoreCase("stderr")) {
getLog().warn(type + ">" + line);
} else {
getLog().info(type + ">" + line);
}
}
} catch (IOException ioe) {
getLog().error("Error consuming " + type + " stream of spawned process.", ioe);
} finally {
if(br != null) {
try { br.close(); } catch(Exception ignore) {}
}
}
}
}
}