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);
}
}
/**
* 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
*/
protected boolean deployChildService(Service service) {
service.init(getConfig());
addService(service);
if (isInState(STATE.STARTED)) {
service.start();
return true;
}
return false;
}
void start() throws InterruptedException {
if (dependencies.size() > 0) {
synchronized (this) {
while (!canStart) {
this.wait(1000 * 60 * 3L);
if (dependenciesFailed) {
throw new TezUncheckedException(
"Skipping service start for "
+ service.getName()
+ " as dependencies failed to start");
}
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Service: " + service.getName() + " trying to start");
}
for (Service dependency : dependencies) {
if (!dependency.isInState(Service.STATE.STARTED)) {
LOG.info(
"Service: "
+ service.getName()
+ " not started because "
+ " service: "
+ dependency.getName()
+ " is in state: "
+ dependency.getServiceState());
return;
}
}
service.start();
}
@Override
public void stateChanged(Service dependency) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Service dependency: "
+ dependency.getName()
+ " notify"
+ " for service: "
+ service.getName());
}
if (dependency.isInState(Service.STATE.STARTED)) {
if (dependenciesStarted.incrementAndGet() == dependencies.size()) {
synchronized (this) {
if (LOG.isDebugEnabled()) {
LOG.debug("Service: " + service.getName() + " notified to start");
}
canStart = true;
this.notifyAll();
}
}
} else if (!service.isInState(Service.STATE.STARTED)
&& dependency.getFailureState() != null) {
synchronized (this) {
dependenciesFailed = true;
if (LOG.isDebugEnabled()) {
LOG.debug(
"Service: "
+ service.getName()
+ " will fail to start"
+ " as dependent service "
+ dependency.getName()
+ " failed to start");
}
this.notifyAll();
}
}
}