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[JENKINS-31961] added workaround for already loaded JACOB library
- implemented slave restarter extension that is based on a windows task
- task is always executed when reconnecting to the master
- task must be named RESTART_JENKINS_SLAVE configured with actions to
restart the slave automatically
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cpoenisch committed Mar 14, 2016
1 parent d58a865 commit f64297f742c03abdcb6401b2f47d62a2e8c2c403
Showing with 118 additions and 0 deletions.
  1. +118 −0 src/main/java/de/tracetronic/jenkins/plugins/ecutest/util/slave/WindowsTaskSlaveRestarter.java
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/**
* Copyright (c) 2015-2016 TraceTronic GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* 3. Neither the name of TraceTronic GmbH nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package de.tracetronic.jenkins.plugins.ecutest.util.slave;

import hudson.Extension;

import java.io.IOException;

import jenkins.slaves.restarter.SlaveRestarter;

/**
* JNLP slave restarter based on Windows Task Scheduler.
* <p>
* This extension point will workaround the problem of already loaded libraries after reconnecting <br>
* to the master (see <a href="https://issues.jenkins-ci.org/browse/JENKINS-31961">JENKINS-31961</a>).
* </p>
* <p>
* In order to work a new task in the Windows Task Scheduler has to be created named <br>
* <i>RESTART_JENKINS_SLAVE</i> and configured with actions how to restart the slave.
* </p>
*
* @since 1.8
* @author Christian Pönisch <christian.poenisch@tracetronic.de>
*/
@Extension
public class WindowsTaskSlaveRestarter extends SlaveRestarter {

private static final long serialVersionUID = 1L;

private static final String TASKNAME = "RESTART_JENKINS_SLAVE";

@Override
public boolean canWork() {
try {
final int ret = queryTask();
return ret == 0;
} catch (InterruptedException | IOException e) {
}
return false;
}

@Override
public void restart() throws Exception {
final int ret = execTask();
throw new IOException("Failed restarting slave!\n"
+ "Task completed with exit value: " + ret);
}

/**
* Queries the task scheduler.
*
* @return the process exit value
* @throws InterruptedException
* the interrupted exception
* @throws IOException
* signals that an I/O exception has occurred
*/
private int queryTask() throws InterruptedException, IOException {
return runProcess("/query");
}

/**
* Executes the task scheduler.
*
* @return the process exit value
* @throws InterruptedException
* the interrupted exception
* @throws IOException
* signals that an I/O exception has occurred
*/
private int execTask() throws InterruptedException, IOException {
return runProcess("/run");
}

/**
* Runs the task process with appropriate arguments.
*
* @param option
* the option
* @return the process exit value
* @throws IOException
* signals that an I/O exception has occurred
* @throws InterruptedException
* the interrupted exception
*/
private int runProcess(final String option) throws IOException, InterruptedException {
final ProcessBuilder procBuilder = new ProcessBuilder("schtasks.exe", option, "/tn", TASKNAME);
final Process proc = procBuilder.start();
return proc.waitFor();
}
}

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