## cascading.pipe.assembly
Class AggregateBy.CompositeFunction

    java.lang.Object
      cascading.operation.BaseOperation<AggregateBy.CompositeFunction.Context>
          cascading.pipe.assembly.AggregateBy.CompositeFunction

All Implemented Interfaces:
  DeclaresResults, Function<AggregateBy.CompositeFunction.Context>, Operation<AggregateBy.CompositeFunction.Context>, Traceable, Serializable

Enclosing class:
  AggregateBy

    public static class AggregateBy.CompositeFunction

extends BaseOperation<AggregateBy.CompositeFunction.Context>
implements Function<AggregateBy.CompositeFunction.Context>

Class CompositeFunction takes multiple Functor instances and manages them as a single `Function`.

See Also:
  `AggregateBy.Functor`, Serialized Form

Nested Class Summary
`static class` `AggregateBy.CompositeFunction.Context`

Field Summary
`static int` `DEFAULT_THRESHOLD`

Fields inherited from class cascading.operation.BaseOperation
`fieldDeclaration, numArgs, trace`

Fields inherited from interface cascading.operation.Operation
`ANY`

Constructor Summary
`AggregateBy.CompositeFunction(Fields groupingFields, Fields[] argumentFields, AggregateBy.Functor[] functors, int threshold)` Constructor CompositeFunction creates a new CompositeFunction instance.
`AggregateBy.CompositeFunction(Fields groupingFields, Fields argumentFields, AggregateBy.Functor functor, int threshold)` Constructor CompositeFunction creates a new CompositeFunction instance.

Method Summary
`boolean` `equals(Object object)`
`void` `flush(FlowProcess flowProcess, OperationCall<AggregateBy.CompositeFunction.Context> operationCall)` The flush method is called when an Operation that is caching values must empty the cache.
`int` `hashCode()`
`void` `operate(FlowProcess flowProcess, FunctionCall<AggregateBy.CompositeFunction.Context> functionCall)` Method operate provides the implementation of this Function.
`void` `prepare(FlowProcess flowProcess, OperationCall<AggregateBy.CompositeFunction.Context> operationCall)` Method prepare does nothing, and may safely be overridden.

Methods inherited from class cascading.operation.BaseOperation
`cleanup, getFieldDeclaration, getNumArgs, getTrace, isSafe, printOperationInternal, toString, toStringInternal`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface cascading.operation.Operation
`cleanup, getFieldDeclaration, getNumArgs, isSafe`

Field Detail

### DEFAULT_THRESHOLD

    public static final int DEFAULT_THRESHOLD

See Also:
  Constant Field Values

Constructor Detail

### AggregateBy.CompositeFunction

    public AggregateBy.CompositeFunction(Fields groupingFields,
                                         Fields argumentFields,
                                         AggregateBy.Functor functor,
                                         int threshold)

  Constructor CompositeFunction creates a new CompositeFunction instance.

  Parameters:
    `groupingFields` - of type Fields
    `argumentFields` - of type Fields
    `functor` - of type Functor
    `threshold` - of type int

### AggregateBy.CompositeFunction

    public AggregateBy.CompositeFunction(Fields groupingFields,
                                         Fields[] argumentFields,
                                         AggregateBy.Functor[] functors,
                                         int threshold)

  Constructor CompositeFunction creates a new CompositeFunction instance.

  Parameters:
    `groupingFields` - of type Fields
    `argumentFields` - of type Fields[]
    `functors` - of type Functor[]
    `threshold` - of type int

Method Detail

### prepare

    public void prepare(FlowProcess flowProcess,
                        OperationCall<AggregateBy.CompositeFunction.Context> operationCall)

  Description copied from class: `BaseOperation`
  Method prepare does nothing, and may safely be overridden.

  Specified by:
    `prepare` in interface `Operation<AggregateBy.CompositeFunction.Context>`
  Overrides:
    `prepare` in class `BaseOperation<AggregateBy.CompositeFunction.Context>`

### operate

    public void operate(FlowProcess flowProcess,
                        FunctionCall<AggregateBy.CompositeFunction.Context> functionCall)

  Description copied from interface: `Function`
  Method operate provides the implementation of this Function.

  Specified by:
    `operate` in interface `Function<AggregateBy.CompositeFunction.Context>`
  Parameters:
    `flowProcess` - of type FlowProcess
    `functionCall` - of type FunctionCall

### flush

    public void flush(FlowProcess flowProcess,
                      OperationCall<AggregateBy.CompositeFunction.Context> operationCall)

  Description copied from interface: `Operation`
  The flush method is called when an Operation that is caching values must empty the cache. It is called before `Operation.cleanup(cascading.flow.FlowProcess, OperationCall)` is invoked.

  It is safe to cast the `OperationCall` to a `FunctionCall`, or equivalent, and get its `FunctionCall.getOutputCollector()`.

  Specified by:
    `flush` in interface `Operation<AggregateBy.CompositeFunction.Context>`
  Overrides:
    `flush` in class `BaseOperation<AggregateBy.CompositeFunction.Context>`

### equals

    public boolean equals(Object object)

  Overrides:
    `equals` in class `BaseOperation<AggregateBy.CompositeFunction.Context>`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `BaseOperation<AggregateBy.CompositeFunction.Context>`

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