Package com.sun.gjc.util

Class SQLTraceCache

java.lang.Object

com.sun.gjc.util.SQLTraceCache

Direct Known Subclasses:

FrequentSQLTraceCache, SlowSqlTraceCache

public abstract class SQLTraceCache
extends Object

Base class for Sql Tracing Caches used to store SQL statements used by applications.

Author:

Shalini M

Field Summary

Fields

Modifier and Type	Field	Description
protected static Logger	_logger
protected ConcurrentSkipListMap<String,SQLTrace>	cache
protected static String	LINE_BREAK
protected int	numTopQueriesToReport
protected String	poolName
protected long	timeToKeepQueries

Constructor Summary

Constructors

Constructor	Description
SQLTraceCache(String poolName, int maxSize, long timeToKeepQueries)

Method Summary

Modifier and Type	Method	Description
void	cancelTimerTask()	Cancel the timer task used to perform a purgeEntries on the cache.
abstract void	checkAndUpdateCache(SQLTrace cacheObj)	Request for adding a sql query in the form of SQLTrace to this cache.
String	getPoolName()
Collection<String>	getSqlTraceList()
void	purgeEntries()	Entries are removed from the list after sorting them in the least frequently used order.
void	scheduleTimerTask(Timer timer)	Schedule timer to perform purgeEntries on the cache after the specified timeToKeepQueries delay and period.

Methods inherited from class java.lang.Object

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

Field Detail

numTopQueriesToReport

protected int numTopQueriesToReport

timeToKeepQueries

protected long timeToKeepQueries

poolName

protected final String poolName

cache

protected ConcurrentSkipListMap<String,SQLTrace> cache

_logger

protected static final Logger _logger

LINE_BREAK

protected static final String LINE_BREAK

See Also:

Constant Field Values

Constructor Detail

SQLTraceCache

public SQLTraceCache(String poolName,
                     int maxSize,
                     long timeToKeepQueries)

Method Detail

getSqlTraceList

public Collection<String> getSqlTraceList()

getPoolName

public String getPoolName()

scheduleTimerTask

public void scheduleTimerTask(Timer timer)

Schedule timer to perform purgeEntries on the cache after the specified timeToKeepQueries delay and period.

Parameters:

timer -

cancelTimerTask

public void cancelTimerTask()

Cancel the timer task used to perform a purgeEntries on the cache.

checkAndUpdateCache

public abstract void checkAndUpdateCache(SQLTrace cacheObj)

Request for adding a sql query in the form of SQLTrace to this cache. If the query is already found in the list, the number of times it is executed is incremented by one along with the timestamp. If the query is a new one, it is added to the list.

Parameters:

cacheObj -

purgeEntries

public void purgeEntries()

Entries are removed from the list after sorting them in the least frequently used order. Only numTopQueriesToReport number of entries are maintained in the list after the purgeEntries.