gr.uoa.di.madgik.searchlibrary.operatorlibrary.keeptop

Class KeepTopOp

java.lang.Object

gr.uoa.di.madgik.searchlibrary.operatorlibrary.keeptop.KeepTopOp

public class KeepTopOp
extends Object

Operator class used to perform a keep top operation on an input ResultSet and produce a new output ResultSet with the top records

Author:

UoA

Constructor Summary

Constructors

Constructor and Description
KeepTopOp(URI locator, StatsContainer stats) Creates a new KeepTopOp with the default timeout for the reader and the writer
KeepTopOp(URI locator, StatsContainer stats, long timeout, TimeUnit timeUnit) Creates a new KeepTopOp with configurable timeout for the reader and the writer

Method Summary

Methods

Modifier and Type	Method and Description
URI	compute(int count) Performs the Keep Top operation

Methods inherited from class java.lang.Object

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

Constructor Detail

KeepTopOp

public KeepTopOp(URI locator,
         StatsContainer stats)

Creates a new KeepTopOp with the default timeout for the reader and the writer

Parameters:

locator - The locator of the input

stats - Statistics

KeepTopOp

public KeepTopOp(URI locator,
         StatsContainer stats,
         long timeout,
         TimeUnit timeUnit)

Creates a new KeepTopOp with configurable timeout for the reader and the writer

Parameters:

locator - The locator of the input

stats - Statistics

timeout - The timeout to be used both by the reader and the writer

timeUnit - The time unit of the timeout used

Method Detail

compute

public URI compute(int count)
            throws Exception

Performs the Keep Top operation

Parameters:

count - The number of records to keep

Returns:

The locator of the produced output

Throws:

Exception - An unrecoverable for the operation error occured