org.zeroturnaround.process.PollingProcess Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of zt-process-killer Show documentation

A library for stopping external processes from Java.

There is a newer version: 1.11

package org.zeroturnaround.process;

import java.io.IOException;

/**
 * Base implementation that polls for a process status.
 * 
 * waitFor methods poll for {@link #isAlive()} method
 * which should be implemented in the sub classes.
 */
public abstract class PollingProcess extends AbstractProcess {

  private volatile long intervalForCheckingFinished = 1000;

  public long getIntervalForCheckingFinished() {
    return intervalForCheckingFinished;
  }

  public void setIntervalForCheckingFinished(long intervalForCheckingFinished) {
    this.intervalForCheckingFinished = intervalForCheckingFinished;
  }

  @Override
  public void waitFor() throws InterruptedException {
    while (true) {
      try {
        boolean alive = isAlive();
        log.trace("{} is alive: {}", getDescription(), alive);
        if (!alive) {
          return;
        }
      }
      catch (IOException e) {
        log.debug("Failed to check if process {} is alive:", getDescription(), e);
      }
      Thread.sleep(intervalForCheckingFinished);
    }
  }

}