Package org.apache.tomcat.jdbc.pool.interceptor

Class AbstractCreateStatementInterceptor

java.lang.Object

org.apache.tomcat.jdbc.pool.JdbcInterceptor

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

All Implemented Interfaces:

InvocationHandler

Direct Known Subclasses:

AbstractQueryReport, QueryTimeoutInterceptor, StatementDecoratorInterceptor, StatementFacade, StatementFinalizer

public abstract class AbstractCreateStatementInterceptor
extends JdbcInterceptor

Abstraction interceptor. This component intercepts all calls to create some type of SQL statement. By extending this class, one can intercept queries and update statements by overriding the createStatement(Object, Method, Object[], Object, long) method.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Constructor<?>[]	constructors	the constructors that are used to create statement proxies
protected static final String	CREATE_STATEMENT
protected static final int	CREATE_STATEMENT_IDX
protected static final String	EXECUTE
protected static final String	EXECUTE_BATCH
protected static final String	EXECUTE_QUERY
protected static final String[]	EXECUTE_TYPES
protected static final String	EXECUTE_UPDATE
protected static final String	PREPARE_CALL
protected static final int	PREPARE_CALL_IDX
protected static final String	PREPARE_STATEMENT
protected static final int	PREPARE_STATEMENT_IDX
protected static final int	STATEMENT_TYPE_COUNT
protected static final String[]	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	Description
AbstractCreateStatementInterceptor()

Method Summary

Modifier and Type	Method	Description
abstract void	closeInvoked()	Method invoked when the operation Connection.close() is invoked.
abstract Object	createStatement(Object proxy, Method method, Object[] args, Object statement, long time)	This method will be invoked after a successful statement creation.
protected Constructor<?>	getConstructor(int idx, Class<?> clazz)	Creates a constructor for a proxy class, if one doesn't already exist
Object	invoke(Object proxy, Method method, Object[] args)	Gets invoked each time an operation on Connection is invoked.
protected boolean	isExecute(Method method, boolean process)	Returns true if the method that is being invoked matches one of the execute types.
protected boolean	isStatement(Method method, boolean process)	Returns true if the method that is being invoked matches one of the statement types.
protected boolean	process(String[] names, Method method, boolean process)
void	reset(ConnectionPool parent, PooledConnection con)	no-op for this interceptor. no state is stored.

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 Details

CREATE_STATEMENT

protected static final String CREATE_STATEMENT

See Also:

• Constant Field Values

CREATE_STATEMENT_IDX

protected static final int CREATE_STATEMENT_IDX

See Also:

• Constant Field Values

PREPARE_STATEMENT

protected static final String PREPARE_STATEMENT

See Also:

• Constant Field Values

PREPARE_STATEMENT_IDX

protected static final int PREPARE_STATEMENT_IDX

See Also:

• Constant Field Values

PREPARE_CALL

protected static final String PREPARE_CALL

See Also:

• Constant Field Values

PREPARE_CALL_IDX

protected static final int PREPARE_CALL_IDX

See Also:

• Constant Field Values

STATEMENT_TYPES

protected static final String[] STATEMENT_TYPES

STATEMENT_TYPE_COUNT

protected static final int STATEMENT_TYPE_COUNT

EXECUTE

protected static final String EXECUTE

See Also:

• Constant Field Values

EXECUTE_QUERY

protected static final String EXECUTE_QUERY

See Also:

• Constant Field Values

EXECUTE_UPDATE

protected static final String EXECUTE_UPDATE

See Also:

• Constant Field Values

EXECUTE_BATCH

protected static final String EXECUTE_BATCH

See Also:

• Constant Field Values

EXECUTE_TYPES

protected static final String[] EXECUTE_TYPES

constructors

protected static final Constructor<?>[] constructors

the constructors that are used to create statement proxies

Constructor Details

AbstractCreateStatementInterceptor

public AbstractCreateStatementInterceptor()

Method Details

invoke

public Object invoke(Object proxy,
 Method method,
 Object[] args)
              throws Throwable

Description copied from class: JdbcInterceptor

Gets invoked each time an operation on Connection is invoked.

Specified by:

invoke in interface InvocationHandler

Overrides:

invoke in class JdbcInterceptor

Throws:

Throwable

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

This method will be invoked after a successful statement creation. This method can choose to return a wrapper around the statement or return the statement itself. If this method returns a wrapper then it should return a wrapper object that implements one of the following interfaces. Statement, PreparedStatement or CallableStatement

Parameters:

proxy - the actual proxy object

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

args - the arguments to the method

statement - the statement that the underlying connection created

time - Elapsed time

Returns:

a Statement object

closeInvoked

public abstract void closeInvoked()

Method invoked when the operation Connection.close() is invoked.

isStatement

protected boolean isStatement(Method method,
 boolean process)

Returns true if the method that is being invoked matches one of the statement types.

Parameters:

method - the method being invoked on the proxy

process - boolean result used for recursion

Returns:

returns true if the method name matched

isExecute

protected boolean isExecute(Method method,
 boolean process)

Returns true if the method that is being invoked matches one of the execute types.

Parameters:

method - the method being invoked on the proxy

process - boolean result used for recursion

Returns:

returns true if the method name matched

process

protected boolean process(String[] names,
 Method method,
 boolean process)

reset

public void reset(ConnectionPool parent,
 PooledConnection con)

no-op for this interceptor. no state is stored.

Specified by:

reset in class JdbcInterceptor

Parameters:

parent - - the connection pool owning the connection

con - - the pooled connection