org.apache.tomcat.jdbc.pool.interceptor

Class AbstractQueryReport

java.lang.Object

org.apache.tomcat.jdbc.pool.JdbcInterceptor

org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor

org.apache.tomcat.jdbc.pool.interceptor.AbstractQueryReport

All Implemented Interfaces:

InvocationHandler

Direct Known Subclasses:

ResetAbandonedTimer, SlowQueryReport

public abstract class AbstractQueryReport
extends AbstractCreateStatementInterceptor

Abstract class that wraps statements and intercepts query executions.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	AbstractQueryReport.StatementProxy Class to measure query execute time

Field Summary

Fields

Modifier and Type	Field and Description
protected static Constructor<?>[]	constructors the constructors that are used to create statement proxies
protected long	threshold The threshold in milliseconds.

Fields inherited from class org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor

CREATE_STATEMENT, CREATE_STATEMENT_IDX, EXECUTE, EXECUTE_BATCH, EXECUTE_QUERY, EXECUTE_TYPES, EXECUTE_UPDATE, PREPARE_CALL, PREPARE_CALL_IDX, PREPARE_STATEMENT, PREPARE_STATEMENT_IDX, STATEMENT_TYPE_COUNT, STATEMENT_TYPES

Fields inherited from class org.apache.tomcat.jdbc.pool.JdbcInterceptor

CLOSE_VAL, EQUALS_VAL, GETCONNECTION_VAL, HASHCODE_VAL, ISCLOSED_VAL, ISVALID_VAL, ISWRAPPERFOR_VAL, properties, TOSTRING_VAL, UNWRAP_VAL

Constructor Summary

Constructors

Constructor and Description
AbstractQueryReport()

Method Summary

Modifier and Type	Method and Description
Object	createStatement(Object proxy, Method method, Object[] args, Object statement, long time) Creates a statement interceptor to monitor query response times
protected Constructor<?>	getConstructor(int idx, Class<?> clazz) Creates a constructor for a proxy class, if one doesn't already exist
long	getThreshold() returns the query measure threshold.
protected abstract void	prepareCall(String query, long time) Invoked when prepareCall has been called and completed.
protected abstract void	prepareStatement(String sql, long time) Invoked when prepareStatement has been called and completed.
protected String	reportFailedQuery(String query, Object[] args, String name, long start, Throwable t) Invoked when a query execution, a call to execute/executeQuery or executeBatch failed.
protected String	reportQuery(String query, Object[] args, String name, long start, long delta) Invoked when a query execution, a call to execute/executeQuery or executeBatch succeeded and was within the timing threshold
protected String	reportSlowQuery(String query, Object[] args, String name, long start, long delta) Invoked when a query execution, a call to execute/executeQuery or executeBatch succeeded and was exceeded the timing threshold
void	setThreshold(long threshold) Sets the query measurement threshold.

Methods inherited from class org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor

closeInvoked, invoke, isExecute, isStatement, process, reset

Methods inherited from class org.apache.tomcat.jdbc.pool.JdbcInterceptor

compare, compare, disconnected, getNext, getProperties, isUseEquals, poolClosed, poolStarted, setNext, setProperties, setUseEquals

Methods inherited from class java.lang.Object

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

Field Detail

threshold

protected long threshold

The threshold in milliseconds. If the query is faster than this, we don't measure it

constructors

protected static final Constructor<?>[] constructors

the constructors that are used to create statement proxies

Constructor Detail

AbstractQueryReport

public AbstractQueryReport()

Method Detail

prepareStatement

protected abstract void prepareStatement(String sql,
                                         long time)

Invoked when prepareStatement has been called and completed.

Parameters:

sql - - the string used to prepare the statement with

time - - the time it took to invoke prepare

prepareCall

protected abstract void prepareCall(String query,
                                    long time)

Invoked when prepareCall has been called and completed.

Parameters:

query - - the string used to prepare the statement with

time - - the time it took to invoke prepare

reportFailedQuery

protected String reportFailedQuery(String query,
                                   Object[] args,
                                   String name,
                                   long start,
                                   Throwable t)

Invoked when a query execution, a call to execute/executeQuery or executeBatch failed.

Parameters:

query - the query that was executed and failed

args - the arguments to the execution

name - the name of the method used to execute AbstractCreateStatementInterceptor.isExecute(Method, boolean)

start - the time the query execution started

t - the exception that happened

Returns:

- the SQL that was executed or the string "batch" if it was a batch execution

reportQuery

protected String reportQuery(String query,
                             Object[] args,
                             String name,
                             long start,
                             long delta)

Invoked when a query execution, a call to execute/executeQuery or executeBatch succeeded and was within the timing threshold

Parameters:

query - the query that was executed and failed

args - the arguments to the execution

name - the name of the method used to execute AbstractCreateStatementInterceptor.isExecute(Method, boolean)

start - the time the query execution started

delta - the time the execution took

Returns:

- the SQL that was executed or the string "batch" if it was a batch execution

reportSlowQuery

protected String reportSlowQuery(String query,
                                 Object[] args,
                                 String name,
                                 long start,
                                 long delta)

Invoked when a query execution, a call to execute/executeQuery or executeBatch succeeded and was exceeded the timing threshold

Parameters:

query - the query that was executed and failed

args - the arguments to the execution

name - the name of the method used to execute AbstractCreateStatementInterceptor.isExecute(Method, boolean)

start - the time the query execution started

delta - the time the execution took

Returns:

- the SQL that was executed or the string "batch" if it was a batch execution

getThreshold

public long getThreshold()

returns the query measure threshold. This value is in milliseconds. If the query is faster than this threshold than it wont be accounted for

Returns:

the threshhold in milliseconds

setThreshold

public void setThreshold(long threshold)

Sets the query measurement threshold. The value is in milliseconds. If the query goes faster than this threshold it will not be recorded.

Parameters:

threshold - set to -1 to record every query. Value is in milliseconds.

getConstructor

protected Constructor<?> getConstructor(int idx,
                                        Class<?> clazz)
                                 throws NoSuchMethodException

Creates a constructor for a proxy class, if one doesn't already exist

Parameters:

idx - - the index of the constructor

clazz - - the interface that the proxy will implement

Returns:

- returns a constructor used to create new instances

Throws:

NoSuchMethodException - Constructor not found

createStatement

public Object createStatement(Object proxy,
                              Method method,
                              Object[] args,
                              Object statement,
                              long time)

Creates a statement interceptor to monitor query response times

Specified by:

createStatement in class AbstractCreateStatementInterceptor

Parameters:

proxy - the actual proxy object

method - the method that was called. It will be one of the methods defined in AbstractCreateStatementInterceptor.STATEMENT_TYPES

args - the arguments to the method

statement - the statement that the underlying connection created

time - Elapsed time

Returns:

a Statement object