gr.uoa.di.madgik.searchlibrary.operatorlibrary.duplicateeliminatoroperator

Class DistinctOp

java.lang.Object

java.lang.Thread

gr.uoa.di.madgik.searchlibrary.operatorlibrary.duplicateeliminatoroperator.DistinctOp

All Implemented Interfaces:

Runnable

public class DistinctOp
extends Thread

This thread performs the actual duplicate elimination

Author:

UoA

Nested Class Summary

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

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
static int	BufferCapacityDef The default buffer capacity for the IRecordWriter and, for the IRecordReader, if applicable
static int	EliminationRatioComputationStepDef A default value for the step of the elimination ratio recomputation
static boolean	KeepMaximumRankDef The default rank processing policy
static int	SafeNumberOfResultsDef A default value for the number of results which is considered safe for a reliable duplicate elimination ratio.
static long	TimeoutDef The default timeout used by the IRecordWriter and all IRecordReaders.
static TimeUnit	TimeUnitDef The default timeout unit used by the IRecordWriter and all IRecordReaders.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Method Summary

Methods

Modifier and Type	Method and Description
static URI	dispatchNewWorker(URI loc, String objectIdFieldName, StatsContainer stats)
static URI	dispatchNewWorker(URI loc, String objectIdFieldName, String objectRankFieldName, boolean keepMaximumRank, long timeout, TimeUnit timeUnit, int bufferCapacity, StatsContainer stats) Static constructor
static URI	dispatchNewWorker(URI loc, String objectIdFieldName, String objectRankFieldName, boolean keepMaximumRank, long timeout, TimeUnit timeUnit, StatsContainer stats) Static constructor
static URI	dispatchNewWorker(URI loc, String objectIdFieldName, String objectRankFieldName, boolean keepMaximumRank, StatsContainer stats)
void	run() Main working cycle: Get a hashtable of distinct DocIDs (plus their ranks) Re-iterate the RS keeping only the RSs that have a matching DocID and Rank with the stored hashtable

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

Field Detail

TimeoutDef

public static final long TimeoutDef

The default timeout used by the IRecordWriter and all IRecordReaders. Currently set to 60.

See Also:

Constant Field Values

TimeUnitDef

public static final TimeUnit TimeUnitDef

The default timeout unit used by the IRecordWriter and all IRecordReaders. The current default unit is seconds.

BufferCapacityDef

public static final int BufferCapacityDef

The default buffer capacity for the IRecordWriter and, for the IRecordReader, if applicable

See Also:

Constant Field Values

KeepMaximumRankDef

public static final boolean KeepMaximumRankDef

The default rank processing policy

See Also:

Constant Field Values

SafeNumberOfResultsDef

public static final int SafeNumberOfResultsDef

A default value for the number of results which is considered safe for a reliable duplicate elimination ratio.

See Also:

Constant Field Values

EliminationRatioComputationStepDef

public static final int EliminationRatioComputationStepDef

A default value for the step of the elimination ratio recomputation

See Also:

Constant Field Values

Method Detail

dispatchNewWorker

public static URI dispatchNewWorker(URI loc,
                    String objectIdFieldName,
                    String objectRankFieldName,
                    boolean keepMaximumRank,
                    long timeout,
                    TimeUnit timeUnit,
                    int bufferCapacity,
                    StatsContainer stats)
                             throws Exception

Static constructor

Parameters:

loc - Locator of the incoming RS

stats -

keepMaximumRank -

timeout -

timeUnit -

bufferCapacity -

Returns:

A gRS2 locator

Throws:

Exception - in case of error

dispatchNewWorker

public static URI dispatchNewWorker(URI loc,
                    String objectIdFieldName,
                    String objectRankFieldName,
                    boolean keepMaximumRank,
                    long timeout,
                    TimeUnit timeUnit,
                    StatsContainer stats)
                             throws Exception

Static constructor

Parameters:

loc - Locator of the incoming RS

stats -

keepMaximumRank -

timeout -

timeUnit -

Returns:

A gRS2 locator

Throws:

Exception - in case of error

dispatchNewWorker

public static URI dispatchNewWorker(URI loc,
                    String objectIdFieldName,
                    StatsContainer stats)
                             throws Exception

Parameters:

loc -

stats -

keepMaximumRank -

Returns:

Throws:

Exception

dispatchNewWorker

public static URI dispatchNewWorker(URI loc,
                    String objectIdFieldName,
                    String objectRankFieldName,
                    boolean keepMaximumRank,
                    StatsContainer stats)
                             throws Exception

Parameters:

loc -

objectIdFieldName -

objectRankFieldName -

keepMaximumRank -

stats -

Returns:

Throws:

Exception

run

public void run()

Main working cycle:

1. Get a hashtable of distinct DocIDs (plus their ranks)
2. Re-iterate the RS keeping only the RSs that have a matching DocID and Rank with the stored hashtable

Specified by:

run in interface Runnable

Overrides:

run in class Thread