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

Introduction

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

Prototype

void start();

Source Link

Document

Start the service.

Usage

From source file:MRAppMaster.CompositeService.java

License:Apache License

protected void serviceStart() throws Exception {
    List<Service> services = getServices();
    if (LOG.isDebugEnabled()) {
        LOG.debug(getName() + ": starting services, size=" + services.size());
    }/* ww  w .java  2s . co  m*/
    for (Service service : services) {
        // start the service. If this fails that service
        // will be stopped and an exception raised
        service.start();
    }
    super.serviceStart();
}

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

License:Apache License

/**
 * Run a child service -initing and starting it if this
 * service has already passed those parts of its own lifecycle
 * @param service the service to start/*from ww w  .j av  a  2 s  . c om*/
 */
protected void runChildService(Service service) {
    service.init(getConfig());
    if (isInState(STATE.STARTED)) {
        service.start();
    }
    addService(service);
}

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

License:Apache License

/**
 * Start the next service in the list.//from   www .j av  a 2  s  .  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;
}

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

License:Apache License

/**
 * Run a child service -initing and starting it if this
 * service has already passed those parts of its own lifecycle
 * @param service the service to start/*  www .ja v a2s . co m*/
 */
protected boolean deployChildService(Service service) {
    service.init(getConfig());
    addService(service);
    if (isInState(STATE.STARTED)) {
        service.start();
        return true;
    }
    return false;
}

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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  . ja v  a 2  s .c  om
 * 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;
}

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