com.ebay.carad.os.vitalsigns.dataretrievers
Class DifferenceQueryLogger

java.lang.Object
  com.ebay.carad.os.vitalsigns.dataretrievers.QueryLogger
      com.ebay.carad.os.vitalsigns.dataretrievers.DifferenceQueryLogger

All Implemented Interfaces:

IDataRetriever, ITemplatizable, java.lang.Cloneable

Direct Known Subclasses:

DifferenceQueryRateLogger

public class DifferenceQueryLogger
extends QueryLogger

Takes the output of a simple one-cell query (column name "data") from the DB and logs the DIFFERENCE between the last time the query was run and the current run. The first time it is invoked it does not log anything.

Data that is logged = CurrentCount - LastCount

Version:

$Id$

Author:

Jeremy Kraybill, Jeremy Thomerson

Field Summary

private java.lang.Float	lastCount
private static org.apache.log4j.Logger	LOGGER

Fields inherited from class com.ebay.carad.os.vitalsigns.dataretrievers.QueryLogger

ZERO

Fields inherited from interface com.ebay.carad.os.vitalsigns.IDataRetriever

NO_OP_DATA_RETRIEVER

Constructor Summary

DifferenceQueryLogger()
Basic constructor.

Method Summary

java.lang.Float	getData()
java.lang.Float	getValue()

Methods inherited from class com.ebay.carad.os.vitalsigns.dataretrievers.QueryLogger

clone, getData, getQuery, getSqlDAO, setQuery, setSqlDAO, templatize

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static final org.apache.log4j.Logger LOGGER

lastCount

private java.lang.Float lastCount

Constructor Detail

DifferenceQueryLogger

public DifferenceQueryLogger()

Basic constructor.

Method Detail

getValue

public java.lang.Float getValue()

Overrides:

getValue in class QueryLogger

See Also:

class comment for details, QueryLogger.getValue()

getData

public java.lang.Float getData()

Overrides:

getData in class QueryLogger