org.apache.nutch.scoring.webgraph
Class Loops.Initializer

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.nutch.scoring.webgraph.Loops.Initializer

All Implemented Interfaces:

Closeable, Configurable, JobConfigurable, Mapper<Text,Writable,Text,ObjectWritable>, Reducer<Text,ObjectWritable,Text,Loops.Route>

Enclosing class:

Loops

public static class Loops.Initializer
extends Configured
implements Mapper<Text,Writable,Text,ObjectWritable>, Reducer<Text,ObjectWritable,Text,Loops.Route>

Initializes the Loop routes.

Constructor Summary

Loops.Initializer()
Default constructor.

Loops.Initializer(Configuration conf)
Configurable constructor.

Method Summary

void	close()
void	configure(JobConf conf) Configure the job.
void	map(Text key, Writable value, OutputCollector<Text,ObjectWritable> output, Reporter reporter) Wraps values in ObjectWritable.
void	reduce(Text key, Iterator<ObjectWritable> values, OutputCollector<Text,Loops.Route> output, Reporter reporter) Takes any node that has inlinks and sets up a route for all of its outlinks.

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

Loops.Initializer

public Loops.Initializer()

Default constructor.

Loops.Initializer

public Loops.Initializer(Configuration conf)

Configurable constructor.

Method Detail

configure

public void configure(JobConf conf)

Configure the job.

Specified by:

configure in interface JobConfigurable

map

public void map(Text key,
                Writable value,
                OutputCollector<Text,ObjectWritable> output,
                Reporter reporter)
         throws IOException

Wraps values in ObjectWritable.

Specified by:

map in interface Mapper<Text,Writable,Text,ObjectWritable>

Throws:

IOException

reduce

public void reduce(Text key,
                   Iterator<ObjectWritable> values,
                   OutputCollector<Text,Loops.Route> output,
                   Reporter reporter)
            throws IOException

Takes any node that has inlinks and sets up a route for all of its outlinks. These routes will then be followed to a maximum depth inside of the Looper job.

Specified by:

reduce in interface Reducer<Text,ObjectWritable,Text,Loops.Route>

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable