com.espertech.esper.epl.view
Class OutputProcessViewConditionFirst

java.lang.Object
  com.espertech.esper.epl.view.OutputProcessViewBase
      com.espertech.esper.epl.view.OutputProcessViewBaseWAfter
          com.espertech.esper.epl.view.OutputProcessViewConditionFirst

All Implemented Interfaces:

JoinSetIndicator, JoinSetProcessor, OutputProcessViewTerminable, EventCollection, View, Viewable, java.lang.Iterable<EventBean>

Direct Known Subclasses:

OutputProcessViewConditionFirstPostProcess

public class OutputProcessViewConditionFirst
extends OutputProcessViewBaseWAfter

Handles output rate limiting for FIRST, only applicable with a having-clause and no group-by clause.

Without having-clause the order of processing won't matter therefore its handled by the OutputProcessViewConditionDefault. With group-by the ResultSetProcessor handles the per-group first criteria.

Field Summary

Fields inherited from class com.espertech.esper.epl.view.OutputProcessViewBaseWAfter

isAfterConditionSatisfied

Fields inherited from class com.espertech.esper.epl.view.OutputProcessViewBase

childView, joinExecutionStrategy, parentView, resultSetProcessor

Constructor Summary

OutputProcessViewConditionFirst(ResultSetProcessor resultSetProcessor, java.lang.Long afterConditionTime, java.lang.Integer afterConditionNumberOfEvents, boolean afterConditionSatisfied, OutputProcessViewConditionFactory parent, AgentInstanceContext agentInstanceContext)

Method Summary

protected void	continueOutputProcessingJoin(boolean doOutput, boolean forceUpdate) Called once the output condition has been met.
protected void	continueOutputProcessingView(boolean doOutput, boolean forceUpdate) Called once the output condition has been met.
java.util.Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
void	process(java.util.Set<MultiKey<EventBean>> newEvents, java.util.Set<MultiKey<EventBean>> oldEvents, ExprEvaluatorContext exprEvaluatorContext) This process (update) method is for participation in a join.
void	terminated()
void	update(EventBean[] newData, EventBean[] oldData) The update method is called if the view does not participate in a join.

Methods inherited from class com.espertech.esper.epl.view.OutputProcessViewBaseWAfter

checkAfterCondition, checkAfterCondition, checkAfterCondition

Methods inherited from class com.espertech.esper.epl.view.OutputProcessViewBase

addView, getEventType, getParent, getViews, hasViews, removeAllViews, removeView, setJoinExecutionStrategy, setParent

Methods inherited from class java.lang.Object

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

Constructor Detail

OutputProcessViewConditionFirst

public OutputProcessViewConditionFirst(ResultSetProcessor resultSetProcessor,
                                       java.lang.Long afterConditionTime,
                                       java.lang.Integer afterConditionNumberOfEvents,
                                       boolean afterConditionSatisfied,
                                       OutputProcessViewConditionFactory parent,
                                       AgentInstanceContext agentInstanceContext)

Method Detail

update

public void update(EventBean[] newData,
                   EventBean[] oldData)

The update method is called if the view does not participate in a join.

Parameters:

newData - - new events

oldData - - old events

process

public void process(java.util.Set<MultiKey<EventBean>> newEvents,
                    java.util.Set<MultiKey<EventBean>> oldEvents,
                    ExprEvaluatorContext exprEvaluatorContext)

This process (update) method is for participation in a join.

Parameters:

newEvents - - new events

oldEvents - - old events

exprEvaluatorContext - expression evaluation context

continueOutputProcessingView

protected void continueOutputProcessingView(boolean doOutput,
                                            boolean forceUpdate)

Called once the output condition has been met. Invokes the result set processor. Used for non-join event data.

Parameters:

doOutput - - true if the batched events should actually be output as well as processed, false if they should just be processed

forceUpdate - - true if output should be made even when no updating events have arrived

continueOutputProcessingJoin

protected void continueOutputProcessingJoin(boolean doOutput,
                                            boolean forceUpdate)

Called once the output condition has been met. Invokes the result set processor. Used for join event data.

Parameters:

doOutput - - true if the batched events should actually be output as well as processed, false if they should just be processed

forceUpdate - - true if output should be made even when no updating events have arrived

iterator

public java.util.Iterator<EventBean> iterator()

Description copied from interface: EventCollection

Allows iteration through all elements in this event collection. The iterator will return the elements in the collection in their natural order, or, if there is no natural ordering, in some unpredictable order.

Returns:

an iterator which will go through all current elements in the collection.

terminated

public void terminated()