com.opencloud.sentinel.providers

Interface ServiceTimerProvider

public interface ServiceTimerProvider

An interface for a provider that can be used by features to raise timers. The TimerEvents generated from the timers can be processed either directly, by a named feature, or by a feature execution script.

If a feature raises a timer to be processed by a feature execution script, it should subsequently call 'featureHasFinished'. The timer, when firing, will cause a new feature execution point (and associated execution script) to be triggered, which can only happen properly if the feature raising the timer has given control back to the core via a 'featureHasFinished'.

Care needs to be taken to make the expiry time of a timer large enough to allow any features running after the current feature in the execution script to complete successfully before the timer fires, otherwise the timer won't trigger the 'onTimer' feature execution script and the timer event will be dropped.

Method Summary

Methods

Modifier and Type	Method and Description
void	cancelTimer(javax.slee.facilities.TimerID timerId) Cancel the timer with the provided 'timerId', if it exists.
void	clearTimer(javax.slee.facilities.TimerID timerId) Clear the timer with the provided 'timerId', if it exists.
java.lang.String	getFeatureNameForTimer(javax.slee.facilities.TimerID timerID) Get the feature name that was provided when the timer was set.
javax.slee.ActivityContextInterface	getServiceTimerAci()
void	registerTimer(java.lang.String featureName, javax.slee.facilities.TimerID timerId, javax.slee.ActivityContextInterface aci) Register an already raised timer with the ServiceTimerProvider.
void	registerTimer(javax.slee.facilities.TimerID timerId, javax.slee.ActivityContextInterface aci) Register an already raised timer with the ServiceTimerProvider.
javax.slee.facilities.TimerID	setTimer(long expiryTime) Raise a new service feature timer.
javax.slee.facilities.TimerID	setTimer(long expiryTime, javax.slee.facilities.TimerOptions options) Raise a new service feature timer.
javax.slee.facilities.TimerID	setTimer(java.lang.String featureName, long expiryTime) Raise a new service feature timer.
javax.slee.facilities.TimerID	setTimer(java.lang.String featureName, long expiryTime, javax.slee.facilities.TimerOptions options) Raise a new service feature timer.
boolean	timerIsSet(javax.slee.facilities.TimerID timerId) Check if a timer with the provided timerID is currently set and registered with the provider.

Method Detail

setTimer

javax.slee.facilities.TimerID setTimer(long expiryTime)

Raise a new service feature timer. When timer fires, the TimerEvent will be delivered via the dedicated 'onTimer' feature execution point. Using default TimerOptions.

Parameters:

expiryTime - The timestamp when the timer is supposed to expire.

Returns:

The TimerID for the timer.

setTimer

javax.slee.facilities.TimerID setTimer(long expiryTime,
                                     javax.slee.facilities.TimerOptions options)

Raise a new service feature timer. When timer fires, the TimerEvent will be delivered via the dedicated 'onTimer' feature execution point.

Parameters:

expiryTime - The timestamp when the timer is supposed to expire.

options - The SLEE TimerOptions that shall be used to raise the timer.

Returns:

The TimerID for the timer.

setTimer

javax.slee.facilities.TimerID setTimer(java.lang.String featureName,
                                     long expiryTime)

Raise a new service feature timer. When timer fires, the TimerEvent will be delivered as an extension event to the named feature. Using default TimerOptions.

Parameters:

featureName - The name of the feature to deliver TimerEvents to.

expiryTime - The timestamp when the timer is supposed to expire.

Returns:

The TimerID for the timer.

setTimer

javax.slee.facilities.TimerID setTimer(java.lang.String featureName,
                                     long expiryTime,
                                     javax.slee.facilities.TimerOptions options)

Raise a new service feature timer. When timer fires, the TimerEvent will be delivered as an extension event to the named feature.

Parameters:

featureName - The name of the feature to deliver TimerEvents to.

expiryTime - The timestamp when the timer is supposed to expire.

options - The SLEE TimerOptions that shall be used to raise the timer.

Returns:

The TimerID for the timer.

registerTimer

void registerTimer(javax.slee.facilities.TimerID timerId,
                 javax.slee.ActivityContextInterface aci)
                   throws ServiceTimerAlreadyExistsException

Register an already raised timer with the ServiceTimerProvider. Also attaches the service Sbb to the provided timer ACI, so the TimerEvent can actually be received when it occurs.

Parameters:

timerId - The SLEE timer id of the raised timer.

aci - The ActivityContextInterface the timer was raised on and to which the service's main Sbb shall be attached.

Throws:

ServiceTimerAlreadyExistsException - If this timer has already been registered.

registerTimer

void registerTimer(java.lang.String featureName,
                 javax.slee.facilities.TimerID timerId,
                 javax.slee.ActivityContextInterface aci)
                   throws ServiceTimerAlreadyExistsException

Register an already raised timer with the ServiceTimerProvider. Also attaches the service Sbb to the provided timer ACI, so the TimerEvent can actually be received when it occurs.

Parameters:

featureName - The name of the feature to deliver TimerEvents to.

timerId - The SLEE timer id of the raised timer.

aci - The ActivityContextInterface the timer was raised on and to which the service's main Sbb shall be attached.

Throws:

ServiceTimerAlreadyExistsException - If this timer has already been registered.

cancelTimer

void cancelTimer(javax.slee.facilities.TimerID timerId)

Cancel the timer with the provided 'timerId', if it exists. If there is no timer with the given 'timerId' registered, the operation has no effect.

Parameters:

timerId - The id of the timer to be cancelled and de-registered.

clearTimer

void clearTimer(javax.slee.facilities.TimerID timerId)

Clear the timer with the provided 'timerId', if it exists. If there is no timer with the given 'timerId' registered, the operation has no effect. Used on receipt of a TimerEvent with this timerId.

Parameters:

timerId - The id of the timer to be cancelled and de-registered.

timerIsSet

boolean timerIsSet(javax.slee.facilities.TimerID timerId)

Check if a timer with the provided timerID is currently set and registered with the provider.

Parameters:

timerId - The SLEE Timer ID of the timer to check.

Returns:

true if the timer was set and registered with the provider; false otherwise.

getFeatureNameForTimer

java.lang.String getFeatureNameForTimer(javax.slee.facilities.TimerID timerID)

Get the feature name that was provided when the timer was set.

Parameters:

timerID - the timer

Returns:

the feature name used when the timer was created, or null if no feature name was provided.

getServiceTimerAci

javax.slee.ActivityContextInterface getServiceTimerAci()

Returns:

the service timer aci used by the service timer provider. May be null if not set.