public interface PreProcessHandler
A client application specifies a pre-process callback class by setting the PRE_PROCESS
system property via either job metadata or at request submission. The callback class may also implement the Cancellable
interface. The class must provide an empty constructor.
The class object is instantiated at the start of request execution. The preProcess
method will be called when the request has transitioned to RUNNING
state.
Enterprise Scheduler creates a new instance of the callback class each time a submitted job request is executed. As such, the job implementation should not rely on class static or instance member variables for maintaining state.
Executable
, State
Modifier and Type | Method and Description |
---|---|
HandlerAction |
preProcess(RequestExecutionContext context, RequestParameters parameters)
Invoked before the job request executable is executed.
|
HandlerAction preProcess(RequestExecutionContext context, RequestParameters parameters)
RUNNING
state. It must return control to the caller and its return value is used to determine how subsequent request processing should proceed.
This method is called each time a given request is executed. For example, it is called each time a failed request is retried, or a paused request is resumed after sub-requests have completed.
context
- the execution context associated with this requestparameters
- the request parameters associated with this requestHandlerAction
whose associated status value indicates the status of this callout. The result will be used to determine how request processing will proceed.
Any action other than those listed below is not supported and will cause the request to transition to an error state and be subject to retries if configured.
PROCEED
to inform Enterprise Scheduler that request processing should commence. The request will remain in RUNNING
state.WARN
to inform Enterprise Scheduler that request processing should commence but that a warning should be logged. The request will remain in RUNNING
state.CANCEL
to inform Enterprise Scheduler that request pre-processing has been cancelled. The request will transition to CANCELLED
state.DELAY
to inform Enterprise Scheduler to postpone request processing by the quantum of time specified by the REPROCESS_DELAY
system property. The request remains in RUNNING
state during the delay.SYSTEM_ERROR
to inform Enterprise Scheduler that the handler has experienced an error. The request will transition to ERROR
unless it is subject to retries based on the value of the RETRIES
system property. If the request will be retried it will transition to ERROR_AUTO_RETRY
state and then WAIT
state.BIZ_ERROR
to inform Enterprise Scheduler that the handler has experienced a business error. The request will transition to ERROR
state. The request is not subject to retries.State