net.ttddyy.dsproxy.listener

Class DataSourceQueryCountListener

java.lang.Object

net.ttddyy.dsproxy.listener.DataSourceQueryCountListener

All Implemented Interfaces:

QueryExecutionListener

public class DataSourceQueryCountListener
extends Object
implements QueryExecutionListener

Update database access information.

Default implementation uses ThreadQueryCountHolder strategy that uses thread local to keep QueryCount. QueryCount can be retrieved by QueryCountHolder.get(String).

Alternatively, SingleQueryCountHolder strategy can be used. This strategy uses single instance to keep QueryCount; therefore, QueryCount holds accumulated total values from any threads until values are cleared.

In web application lifecycle, one http request is handled by one thread. Storing database access information into a thread local value provides metrics information per http request. On the other hand, using single instance to store database access information allows you to retrieve total accumulated numbers since application has started.

QueryCount holds following data:

• datasource name
• number of database call
• total query execution time
• number of queries by type

Author:

Tadaya Tsuyukubo

See Also:

QueryCount, QueryCountHolder, QueryCountStrategy, CommonsQueryCountLoggingServletFilter, CommonsQueryCountLoggingRequestListener, CommonsQueryCountLoggingHandlerInterceptor

Field Summary

Fields inherited from interface net.ttddyy.dsproxy.listener.QueryExecutionListener

DEFAULT

Constructor Summary

Constructors

Constructor and Description
DataSourceQueryCountListener()

Method Summary

Modifier and Type	Method and Description
void	afterQuery(ExecutionInfo execInfo, List<QueryInfo> queryInfoList)
void	beforeQuery(ExecutionInfo execInfo, List<QueryInfo> queryInfoList)
QueryCountStrategy	getQueryCountStrategy()
void	setQueryCountStrategy(QueryCountStrategy queryCountStrategy)

Methods inherited from class java.lang.Object

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

Constructor Detail

DataSourceQueryCountListener

public DataSourceQueryCountListener()

Method Detail

beforeQuery

public void beforeQuery(ExecutionInfo execInfo,
                        List<QueryInfo> queryInfoList)

Specified by:

beforeQuery in interface QueryExecutionListener

afterQuery

public void afterQuery(ExecutionInfo execInfo,
                       List<QueryInfo> queryInfoList)

Specified by:

afterQuery in interface QueryExecutionListener

getQueryCountStrategy

public QueryCountStrategy getQueryCountStrategy()

Since:

1.4.2

setQueryCountStrategy

public void setQueryCountStrategy(QueryCountStrategy queryCountStrategy)

Since:

1.4.2