gr.uoa.di.madgik.searchlibrary.operatorlibrary.join

Class JoinWorker

java.lang.Object

java.lang.Thread

gr.uoa.di.madgik.searchlibrary.operatorlibrary.join.JoinWorker

All Implemented Interfaces:

Runnable

public class JoinWorker
extends Thread

Helper thread class used to perform the join operation

Author:

UoA

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description

JoinWorker(gr.uoa.di.madgik.grs.writer.IRecordWriter<gr.uoa.di.madgik.grs.record.Record> writer, gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> leftReader, gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> rightReader, String leftKeyFieldName, String rightKeyFieldName, DefinitionIndexResolver defResolver, int[] keyIndices, RecordGenerationPolicy recordGenerationPolicy, long timeout, TimeUnit timeUnit, StatsContainer stats, String uid) Creates a new JoinWorker

Method Summary

Modifier and Type	Method and Description
void	checkJoin(JoinElement tmp, HashJoin join1, HashJoin join2, gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> leftReader, gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> rightReader, Object synch, BlockingQueue<JoinElement> queue, EventHandler eventHandler, BooleanHolder stopNotifier) Checks if the provided elements must be joined and places it in the respective hash table
void	run()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinWorker

public JoinWorker(gr.uoa.di.madgik.grs.writer.IRecordWriter<gr.uoa.di.madgik.grs.record.Record> writer,
                  gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> leftReader,
                  gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> rightReader,
                  String leftKeyFieldName,
                  String rightKeyFieldName,
                  DefinitionIndexResolver defResolver,
                  int[] keyIndices,
                  RecordGenerationPolicy recordGenerationPolicy,
                  long timeout,
                  TimeUnit timeUnit,
                  StatsContainer stats,
                  String uid)

Creates a new JoinWorker

Parameters:

writer - The IRecordWriter to write records to

leftReader - The reader for the left input

rightReader - The reader for the right input

leftKeyFieldName - The name of the Field originating from the left RandomReader and containing the key to base the join on

rightKeyFieldName - The name of the Field originating from the right RandomReader and containing the key to base the join on

keyIndex - The index of the join key in the RecordDefinition of the producer

recordGenerationPolicy - The record generation policy that should be used

timeout - The timeout to be used both by the RandomReaders and the IRecordWriter

timeUnit - The time unit of the timeout that will be used

stats - statistics

uid - A unique identifier for this operation

Method Detail

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread

See Also:

Runnable.run()

checkJoin

public void checkJoin(JoinElement tmp,
                      HashJoin join1,
                      HashJoin join2,
                      gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> leftReader,
                      gr.uoa.di.madgik.grs.reader.RandomReader<gr.uoa.di.madgik.grs.record.Record> rightReader,
                      Object synch,
                      BlockingQueue<JoinElement> queue,
                      EventHandler eventHandler,
                      BooleanHolder stopNotifier)

Checks if the provided elements must be joined and places it in the respective hash table

Parameters:

tmp - The element to check

join1 - The Hash table for the left input

join2 - The Hash table for the right input

leftReader - The left input reader

rightReader - The right input reader

synch - An object used to synchronize readers

queue - The record queue from which records are retrieved

eventHandler - The event handler used to propagate events

stopNotifier - An object used to signify the end of processing