org.apache.flink.graph.examples

Class SingleSourceShortestPaths

java.lang.Object

org.apache.flink.graph.examples.SingleSourceShortestPaths

All Implemented Interfaces:

ProgramDescription

public class SingleSourceShortestPaths
extends Object
implements ProgramDescription

This example shows how to use Gelly's scatter-gather iterations. It is an implementation of the Single-Source-Shortest-Paths algorithm. For a gather-sum-apply implementation of the same algorithm, please refer to GSASingleSourceShortestPaths. The input file is a plain text file and must be formatted as follows: Edges are represented by tuples of srcVertexId, trgVertexId, distance which are separated by tabs. Edges themselves are separated by newlines. For example: 1\t2\t0.1\n1\t3\t1.4\n defines two edges, edge 1-2 with distance 0.1, and edge 1-3 with distance 1.4. If no parameters are provided, the program is run with default data from SingleSourceShortestPathsData

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SingleSourceShortestPaths.MinDistanceMessenger Distributes the minimum distance associated with a given vertex among all the target vertices summed up with the edge's value.
static class	SingleSourceShortestPaths.VertexDistanceUpdater Function that updates the value of a vertex by picking the minimum distance from all incoming messages.

Constructor Summary

Constructors

Constructor and Description
SingleSourceShortestPaths()

Method Summary

Modifier and Type	Method and Description
String	getDescription() Returns a description of the plan that is generated by the assembler and also of the arguments if they are available.
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

SingleSourceShortestPaths

public SingleSourceShortestPaths()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

getDescription

public String getDescription()

Description copied from interface: ProgramDescription

Returns a description of the plan that is generated by the assembler and also of the arguments if they are available. The description should be simple text as it may be rendered in different environments (console, web interface, ...). Typical things that should be included are:

• expected input format
• description of output
• description of what is done
• description of arguments to customize plan if available

Specified by:

getDescription in interface ProgramDescription

Returns:

A description of the program and of its arguments if available.