cloud.piranha.feature.pid.PidFeature Maven / Gradle / Ivy
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*
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package cloud.piranha.feature.pid;
import cloud.piranha.feature.impl.DefaultFeature;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import static java.lang.System.Logger.Level.WARNING;
/**
* The PID feature.
*
* @author Manfred Riem ([email protected])
*/
public class PidFeature extends DefaultFeature implements Runnable {
/**
* Stores the logger.
*/
private static final System.Logger LOGGER = System.getLogger(PidFeature.class.getName());
/**
* Stores the PID.
*/
private Long pid;
/**
* Stores the stop flag.
*/
private boolean stop = false;
/**
* Stores the thread.
*/
private Thread thread;
/**
* Get the PID.
*
* @return the PID.
*/
public Long getPid() {
return pid;
}
/**
* Get the thread.
*
* @return the thread.
*/
public Thread getThread() {
return thread;
}
@Override
public void run() {
while (!stop) {
if (pid != null) {
File pidFile = new File("tmp", "piranha.pid");
if (!pidFile.exists()) {
stop();
}
}
try {
Thread.sleep(2000);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
/**
* Set the PID.
*
* @param pid the PID.
*/
public void setPid(Long pid) {
this.pid = pid;
}
@Override
public void start() {
stop = false;
thread = new Thread(this);
thread.start();
File pidFile = new File("tmp", "piranha.pid");
if (!pidFile.getParentFile().exists() && !pidFile.getParentFile().mkdirs()) {
LOGGER.log(WARNING, "Unable to create tmp directory for PID file");
}
try (PrintWriter writer = new PrintWriter(new FileWriter(pidFile))) {
writer.println(pid);
writer.flush();
} catch (IOException ioe) {
LOGGER.log(WARNING, "Unable to write PID file", ioe);
}
}
@Override
public void stop() {
stop = true;
thread = null;
featureManager.stop();
}
}