package org.argeo.cms.e4;
   
   import java.security.AccessControlContext;
   import java.security.AccessController;
   import java.security.PrivilegedAction;
   
   import javax.security.auth.Subject;
   
   import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.core.runtime.jobs.Job;
  
  /**
   * Propagate authentication to an eclipse job. Typically to execute a privileged
   * action outside the UI thread
   */
  public abstract class PrivilegedJob extends Job {
  	private final Subject subject;
  
  	public PrivilegedJob(String jobName) {
  		this(jobName, AccessController.getContext());
  	}
  
  	public PrivilegedJob(String jobName,
  			AccessControlContext accessControlContext) {
  		super(jobName);
  		subject = Subject.getSubject(accessControlContext);
  
  		// Must be called *before* the job is scheduled,
  		// it is required for the progress window to appear
  		setUser(true);
  	}
  
  	@Override
  	protected IStatus run(final IProgressMonitor progressMonitor) {
  		PrivilegedAction<IStatus> privilegedAction = new PrivilegedAction<IStatus>() {
  			public IStatus run() {
  				return doRun(progressMonitor);
  			}
  		};
  		return Subject.doAs(subject, privilegedAction);
  	}
  
  	/**
  	 * Implement here what should be executed with default context
  	 * authentication
  	 */
  	protected abstract IStatus doRun(IProgressMonitor progressMonitor);
  }