Package org.apache.flink.cep

Class RichPatternSelectFunction<IN,OUT>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.cep.RichPatternSelectFunction<IN,OUT>

Type Parameters:

IN - Type of the input elements

OUT - Type of the output element

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction, PatternSelectFunction<IN,OUT>

public abstract class RichPatternSelectFunction<IN,OUT>
extends org.apache.flink.api.common.functions.AbstractRichFunction
implements PatternSelectFunction<IN,OUT>

Rich variant of the PatternSelectFunction. As a RichFunction, it gives access to the RuntimeContext and provides setup and teardown methods: RichFunction.open(OpenContext) and RichFunction.close().

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
RichPatternSelectFunction()

Method Summary

Modifier and Type	Method	Description
abstract OUT	select(Map<String,List<IN>> pattern)	Generates a result from the given map of events.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Details

RichPatternSelectFunction

public RichPatternSelectFunction()

Method Details

select

public abstract OUT select(Map<String,List<IN>> pattern)
                    throws Exception

Description copied from interface: PatternSelectFunction

Generates a result from the given map of events. The events are identified by their names. Only one resulting element can be generated.

Specified by:

select in interface PatternSelectFunction<IN,OUT>

Parameters:

pattern - Map containing the found pattern. Events are identified by their names

Returns:

Resulting element

Throws:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.