public class AuxServices extends AbstractService implements ServiceStateChangeListener, EventHandler<AuxServicesEvent>
Service.STATE
Modifier and Type | Field and Description |
---|---|
protected Map<String,AuxiliaryService> |
serviceMap |
protected Map<String,ByteBuffer> |
serviceMetaData |
Constructor and Description |
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AuxServices() |
Modifier and Type | Method and Description |
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protected void |
addService(String name,
AuxiliaryService service) |
Map<String,ByteBuffer> |
getMetaData() |
void |
handle(AuxServicesEvent event) |
void |
serviceInit(Configuration conf)
All initialization code needed by a service.
|
void |
serviceStart()
Actions called during the INITED to STARTED transition.
|
void |
serviceStop()
Actions called during the transition to the STOPPED state.
|
void |
stateChanged(Service service)
Callback to notify of a state change.
|
close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop
protected final Map<String,AuxiliaryService> serviceMap
protected final Map<String,ByteBuffer> serviceMetaData
protected final void addService(String name, AuxiliaryService service)
public Map<String,ByteBuffer> getMetaData()
public void serviceInit(Configuration conf) throws Exception
AbstractService
AbstractService.init(Configuration)
prevents re-entrancy.
The base implementation checks to see if the subclass has created
a new configuration instance, and if so, updates the base class valueserviceInit
in class AbstractService
conf
- configurationException
- on a failure -these will be caught,
possibly wrapped, and wil; trigger a service stoppublic void serviceStart() throws Exception
AbstractService
AbstractService.start()
prevents re-entrancy.serviceStart
in class AbstractService
Exception
- if needed -these will be caught,
wrapped, and trigger a service stoppublic void serviceStop() throws Exception
AbstractService
AbstractService.stop()
prevents re-entrancy.
Implementations MUST write this to be robust against failures, including
checks for null references -and for the first failure to not stop other
attempts to shut down parts of the service.serviceStop
in class AbstractService
Exception
- if needed -these will be caught and logged.public void stateChanged(Service service)
ServiceStateChangeListener
stateChanged
in interface ServiceStateChangeListener
service
- the service that has changed.public void handle(AuxServicesEvent event)
handle
in interface EventHandler<AuxServicesEvent>
Copyright © 2013 Apache Software Foundation. All rights reserved.