com.amazonaws.services.simpleworkflow.flow.worker
Class DecisionTaskHandler

java.lang.Object
  com.amazonaws.services.simpleworkflow.flow.worker.DecisionTaskHandler

Direct Known Subclasses:

AsyncDecisionTaskHandler

public abstract class DecisionTaskHandler
extends java.lang.Object

Base class for workflow task handlers. Extend this class to implement custom deciders that can be executed using a WorkflowTaskPollingExecutorService.

See Also:

WorkflowTaskPollingExecutorService

Constructor Summary

DecisionTaskHandler()

Method Summary

abstract java.util.List<AsyncTaskInfo>	getAsynchronousThreadDump(java.util.Iterator<DecisionTask> decisionTaskIterator)
abstract java.lang.String	getAsynchronousThreadDumpAsString(java.util.Iterator<DecisionTask> decisionTaskIterator)
abstract RespondDecisionTaskCompletedRequest	handleDecisionTask(java.util.Iterator<DecisionTask> decisionTaskIterator) The implementation should be called when a polling SWF Decider receives a new WorkflowTask.
abstract java.lang.Object	loadWorkflowThroughReplay(java.util.Iterator<DecisionTask> decisionTaskIterator)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DecisionTaskHandler

public DecisionTaskHandler()

Method Detail

handleDecisionTask

public abstract RespondDecisionTaskCompletedRequest handleDecisionTask(java.util.Iterator<DecisionTask> decisionTaskIterator)
                                                                throws java.lang.Exception

The implementation should be called when a polling SWF Decider receives a new WorkflowTask. Later, that decider should call one of #respondWorkflowTaskCompleted(String, Transition, AmazonSimpleWorkflow) or #respondWorkflowTaskFailed(String, int, String, Map, AmazonSimpleWorkflow) .

Parameters:

workflowTask - The decision task to handle. The reason for more then one task being received is pagination of the history. All tasks in the iterator contain the same information but different pages of the history. The tasks are loaded lazily when Iterator.next() is called. It is expected that the method implementation aborts decision by rethrowing any exception from Iterator.next().

Throws:

java.lang.Exception

getAsynchronousThreadDump

public abstract java.util.List<AsyncTaskInfo> getAsynchronousThreadDump(java.util.Iterator<DecisionTask> decisionTaskIterator)
                                                                 throws java.lang.Exception

Throws:

java.lang.Exception

getAsynchronousThreadDumpAsString

public abstract java.lang.String getAsynchronousThreadDumpAsString(java.util.Iterator<DecisionTask> decisionTaskIterator)
                                                            throws java.lang.Exception

Throws:

java.lang.Exception

loadWorkflowThroughReplay

public abstract java.lang.Object loadWorkflowThroughReplay(java.util.Iterator<DecisionTask> decisionTaskIterator)
                                                    throws java.lang.Exception

Throws:

java.lang.Exception