org.apache.hama.graph

Class VertexInputReader<KEYIN extends org.apache.hadoop.io.Writable,VALUEIN extends org.apache.hadoop.io.Writable,V extends org.apache.hadoop.io.WritableComparable,E extends org.apache.hadoop.io.Writable,M extends org.apache.hadoop.io.Writable>

java.lang.Object

org.apache.hama.graph.VertexInputReader<KEYIN,VALUEIN,V,E,M>

Type Parameters:

KEYIN - the input format's KEYIN type.

VALUEIN - the input format's VALUE_IN type.

V - the vertex id type.

E - the Edge cost object type.

M - the Vertex value/message object type.

All Implemented Interfaces:

PartitioningRunner.RecordConverter

public abstract class VertexInputReader<KEYIN extends org.apache.hadoop.io.Writable,VALUEIN extends org.apache.hadoop.io.Writable,V extends org.apache.hadoop.io.WritableComparable,E extends org.apache.hadoop.io.Writable,M extends org.apache.hadoop.io.Writable>
extends Object
implements PartitioningRunner.RecordConverter

A reader to read Hama's input files and parses a vertex out of it.

Constructor Summary

Constructors

Constructor and Description
VertexInputReader()

Method Summary

Methods

Modifier and Type	Method and Description
KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable>	convertRecord(KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable> inputRecord, org.apache.hadoop.conf.Configuration conf)
int	getPartitionId(KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable> inputRecord, Partitioner partitioner, org.apache.hadoop.conf.Configuration conf, BSPPeer peer, int numTasks)
abstract boolean	parseVertex(KEYIN key, VALUEIN value, Vertex<V,E,M> vertex) Parses a given key and value into the given vertex.
void	setup(org.apache.hadoop.conf.Configuration conf)

Methods inherited from class java.lang.Object

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

Constructor Detail

VertexInputReader

public VertexInputReader()

Method Detail

setup

public void setup(org.apache.hadoop.conf.Configuration conf)

Specified by:

setup in interface PartitioningRunner.RecordConverter

parseVertex

public abstract boolean parseVertex(KEYIN key,
                  VALUEIN value,
                  Vertex<V,E,M> vertex)
                             throws Exception

Parses a given key and value into the given vertex. If returned true, the given vertex is considered finished and a new instance will be given in the next call.

Throws:

Exception

convertRecord

public KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable> convertRecord(KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable> inputRecord,
                                                                                      org.apache.hadoop.conf.Configuration conf)
                                                                                        throws IOException

Specified by:

convertRecord in interface PartitioningRunner.RecordConverter

Throws:

IOException

getPartitionId

public int getPartitionId(KeyValuePair<org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable> inputRecord,
                 Partitioner partitioner,
                 org.apache.hadoop.conf.Configuration conf,
                 BSPPeer peer,
                 int numTasks)

Specified by:

getPartitionId in interface PartitioningRunner.RecordConverter