org.apache.giraph.examples

Class SimpleVertexWithWorkerContext.EmitterWorkerContext

java.lang.Object

org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable<I,V,E>

org.apache.giraph.worker.WorkerAggregatorDelegator<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable>

org.apache.giraph.worker.WorkerContext

org.apache.giraph.examples.SimpleVertexWithWorkerContext.EmitterWorkerContext

All Implemented Interfaces:

AggregatorUsage, GiraphConfigurationSettable<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable>, ImmutableClassesGiraphConfigurable<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable>, WorkerAggregatorUsage, WorkerBroadcastUsage, WorkerGlobalCommUsage, WorkerIndexUsage<org.apache.hadoop.io.WritableComparable>, WorkerReduceUsage, org.apache.hadoop.io.Writable

Enclosing class:

SimpleVertexWithWorkerContext

public static class SimpleVertexWithWorkerContext.EmitterWorkerContext
extends WorkerContext

Example worker context to emit data as part of a superstep.

Constructor Summary

Constructors

Constructor and Description
EmitterWorkerContext()

Method Summary

Modifier and Type	Method and Description
void	emit(String s) Write this string to the output stream.
void	postApplication() Finalize the WorkerContext.
void	postSuperstep() Execute user code.
void	preApplication() Initialize the WorkerContext.
void	preSuperstep() Execute user code.

Methods inherited from class org.apache.giraph.worker.WorkerContext

getAndClearMessagesFromOtherWorkers, getContext, getMyWorkerIndex, getSuperstep, getTotalNumEdges, getTotalNumVertices, getWorkerCount, getWorkerForVertex, logToCommandLine, readFields, sendMessageToWorker, setGraphState, setupSuperstep, write

Methods inherited from class org.apache.giraph.worker.WorkerAggregatorDelegator

aggregate, getAggregatedValue, getBroadcast, reduce, reduceMerge, setWorkerGlobalCommUsage

Methods inherited from class org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

EmitterWorkerContext

public EmitterWorkerContext()

Method Detail

preApplication

public void preApplication()

Description copied from class: WorkerContext

Initialize the WorkerContext. This method is executed once on each Worker before the first superstep starts.

Specified by:

preApplication in class WorkerContext

postApplication

public void postApplication()

Description copied from class: WorkerContext

Finalize the WorkerContext. This method is executed once on each Worker after the last superstep ends.

Specified by:

postApplication in class WorkerContext

preSuperstep

public void preSuperstep()

Description copied from class: WorkerContext

Execute user code. This method is executed once on each Worker before each superstep starts.

Specified by:

preSuperstep in class WorkerContext

postSuperstep

public void postSuperstep()

Description copied from class: WorkerContext

Execute user code. This method is executed once on each Worker after each superstep ends.

Specified by:

postSuperstep in class WorkerContext

emit

public void emit(String s)

Write this string to the output stream.

Parameters:

s - String to dump.