JobHelper.java

/**
 * Copyright (c) 2014 - 2017 Frank Appel
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Frank Appel - initial API and implementation
 */
package com.codeaffine.eclipse.ui.progress;

import static com.codeaffine.eclipse.swt.test.util.DisplayHelper.flushPendingEvents;
import static com.codeaffine.eclipse.ui.progress.ThreadHelper.sleep;

import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;

class JobHelper extends JobChangeAdapter {

  private static final int RETRIES = 30;

  private boolean done;
  private int retries;

  JobHelper() {}

  JobHelper( Job job ) {
    job.addJobChangeListener( this );
  }

  @Override
  public void done( IJobChangeEvent event ) {
    done = true;
  }

  void waitTillJobHasFinished() {
    retries = RETRIES;
    while( mustRetry() ) {
      flushPendingEvents();
      decrementRetries();
      sleep( 100 );
    }
  }

  private boolean mustRetry() {
    return retries > 0 && !done;
  }

  private void decrementRetries() throws AssertionError {
    retries--;
    if( retries == 0 ) {
      throw new AssertionError( "Job Helper exceeded retries[" + RETRIES + "]" );
    }
  }
}