com.google.appengine.tools.mapreduce.inputs

Class UnmarshallingInput<I>

java.lang.Object

com.google.appengine.tools.mapreduce.Input<I>

com.google.appengine.tools.mapreduce.inputs.UnmarshallingInput<I>

Type Parameters:

I - type of values produced by this input

All Implemented Interfaces:

Serializable

public final class UnmarshallingInput<I>
extends Input<I>

An Input that unmarshalls records.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UnmarshallingInput(Input<ByteBuffer> input, Marshaller<I> marshaller)

Method Summary

Methods

Modifier and Type	Method and Description
List<InputReader<I>>	createReaders() Returns a list of readers for this input.

Methods inherited from class com.google.appengine.tools.mapreduce.Input

getContext

Methods inherited from class java.lang.Object

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

Constructor Detail

UnmarshallingInput

public UnmarshallingInput(Input<ByteBuffer> input,
                  Marshaller<I> marshaller)

Parameters:

input - The input producing values to unmarshall.

marshaller - The marshaller to use for unmarshalling the input values.

Method Detail

createReaders

public List<InputReader<I>> createReaders()
                                   throws IOException

Description copied from class: Input

Returns a list of readers for this input. It is the Input's responsibility to determine an appropriate number of readers to split into. This could be specified by the user or determined algorithmically. The number of input readers returned determines the number of map shards.

Specified by:

createReaders in class Input<I>

Throws:

IOException