Example usage for org.apache.hadoop.service Service registerServiceListener

Introduction

In this page you can find the example usage for org.apache.hadoop.service Service registerServiceListener.

Prototype

void registerServiceListener(ServiceStateChangeListener listener);

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Document

Usage

From source file:org.apache.hoya.yarn.service.CompoundService.java

License:Apache License

/**
 * Add a service, and register it//from w w  w.  j  a v  a 2  s.c o m
 * @param service the {@link Service} to be added.
 * Important: do not add a service to a parent during your own serviceInit/start,
 * in Hadoop 2.2; you will trigger a ConcurrentModificationException.
 */
@Override
public void addService(Service service) {
    service.registerServiceListener(this);
    super.addService(service);
}

From source file:org.apache.hoya.yarn.service.SequenceService.java

License:Apache License

/**
 * Start the next service in the list./*from www.  java2s . co m*/
 * Return false if there are no more services to run, or this
 * service has stopped
 * @return true if a service was started
 * @throws RuntimeException from any init or start failure
 * @throws ServiceStateException if this call is made before
 * the service is started
 */
public synchronized boolean startNextService() {
    if (isInState(STATE.STOPPED)) {
        //downgrade to a failed
        log.debug("Not starting next service -{} is stopped", this);
        return false;
    }
    if (!isInState(STATE.STARTED)) {
        //reject attempts to start a service too early
        throw new ServiceStateException("Cannot start a child service when not started");
    }
    if (serviceList.isEmpty()) {
        //nothing left to run
        return false;
    }
    if (currentService != null && currentService.getFailureCause() != null) {
        //did the last service fail? Is this caused by some premature callback?
        log.debug("Not starting next service due to a failure of {}", currentService);
        return false;
    }
    //bear in mind that init & start can fail, which
    //can trigger re-entrant calls into the state change listener.
    //by setting the current service to null
    //the start-next-service logic is skipped.
    //now, what does that mean w.r.t exit states?

    currentService = null;
    Service head = serviceList.remove(0);

    try {
        head.init(getConfig());
        head.registerServiceListener(this);
        head.start();
    } catch (RuntimeException e) {
        noteFailure(e);
        throw e;
    }
    //at this point the service must have explicitly started & not failed,
    //else an exception would have been raised
    currentService = head;
    return true;
}

From source file:org.apache.slider.server.services.utility.EndOfServiceWaiter.java

License:Apache License

/**
 * Wait for a service//from  www. jav  a  2s . c om
 * @param name name for messages
 * @param service service
 */
public EndOfServiceWaiter(String name, Service service) {
    this.name = name;
    this.service = service;
    service.registerServiceListener(this);
}

From source file:org.apache.slider.server.services.workflow.EndOfServiceWaiter.java

License:Apache License

public EndOfServiceWaiter(Service svc) {
    svc.registerServiceListener(this);
}

From source file:org.apache.slider.server.services.workflow.WorkflowCompositeService.java

License:Apache License

/**
 * Add a service, and register it//from  w w  w  .j  a v  a 2s.c  om
 * @param service the {@link Service} to be added.
 * Important: do not add a service to a parent during your own serviceInit/start,
 * in Hadoop 2.2; you will trigger a ConcurrentModificationException.
 */
@Override
public synchronized void addService(Service service) {
    Preconditions.checkArgument(service != null, "null service argument");
    service.registerServiceListener(this);
    super.addService(service);
}

From source file:org.apache.slider.server.services.workflow.WorkflowSequenceService.java

License:Apache License

/**
 * Start the next service in the list.//from   w  w  w.  j  a v a2s.  c  o  m
 * Return false if there are no more services to run, or this
 * service has stopped
 * @return true if a service was started
 * @throws RuntimeException from any init or start failure
 * @throws ServiceStateException if this call is made before
 * the service is started
 */
public synchronized boolean startNextService() {
    if (isInState(STATE.STOPPED)) {
        //downgrade to a failed
        LOG.debug("Not starting next service -{} is stopped", this);
        return false;
    }
    if (!isInState(STATE.STARTED)) {
        //reject attempts to start a service too early
        throw new ServiceStateException("Cannot start a child service when not started");
    }
    if (serviceList.isEmpty()) {
        //nothing left to run
        return false;
    }
    if (activeService != null && activeService.getFailureCause() != null) {
        //did the last service fail? Is this caused by some premature callback?
        LOG.debug("Not starting next service due to a failure of {}", activeService);
        return false;
    }
    //bear in mind that init & start can fail, which
    //can trigger re-entrant calls into the state change listener.
    //by setting the current service to null
    //the start-next-service logic is skipped.
    //now, what does that mean w.r.t exit states?

    activeService = null;
    Service head = serviceList.remove(0);

    try {
        head.init(getConfig());
        head.registerServiceListener(this);
        head.start();
    } catch (RuntimeException e) {
        noteFailure(e);
        throw e;
    }
    //at this point the service must have explicitly started & not failed,
    //else an exception would have been raised
    activeService = head;
    return true;
}

From source file:org.apache.tez.dag.app.DAGAppMaster.java

License:Apache License

protected void addIfServiceDependency(Object object, Object dependency) {
    if (object instanceof Service && dependency instanceof Service) {
        Service service = (Service) object;
        Service dependencyService = (Service) dependency;
        ServiceWithDependency sd = services.get(service);
        sd.dependencies.add(dependencyService);
        dependencyService.registerServiceListener(sd);
    }/*  w  ww.  jav a 2  s.  c om*/
}