org.firebirdsql.pool
Class PooledPreparedStatementHandler

java.lang.Object
  org.firebirdsql.pool.PooledPreparedStatementHandler

All Implemented Interfaces:

InvocationHandler

public class PooledPreparedStatementHandler
extends Object
implements InvocationHandler

Wrapper for prepared statements. This invocation handler notifies statement manager about closing prepared statement.

Author:

Roman Rokytskyy

Method Summary

protected void	checkCorrectness(Method method) Check if method call is correct.
static Method	findMethod(Class clazz, String name, Class[] params)
protected void	handleForceClose()
protected boolean	handleIsCached()
protected void	handleStatementClose(String statement, Object proxy) Handle Statement.close() call.
Object	invoke(Object proxy, Method method, Object[] args) Invoke method on a specified proxy.

Methods inherited from class java.lang.Object

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

Method Detail

findMethod

public static Method findMethod(Class clazz,
                                String name,
                                Class[] params)

handleStatementClose

protected void handleStatementClose(String statement,
                                    Object proxy)
                             throws SQLException

Handle Statement.close() call.

Parameters:

statement - SQL statement corresponding to the wrapped prepared statement.

proxy - dynamic proxy wrapping prepared statement.

Throws:

SQLException - if something went wrong.

handleForceClose

protected void handleForceClose()
                         throws SQLException

Throws:

SQLException

handleIsCached

protected boolean handleIsCached()
                          throws SQLException

Throws:

SQLException

invoke

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

Invoke method on a specified proxy. Here we check if method is a method Statement.close(). If yes, we notify owner that this prepared statement was closed.

Specified by:

invoke in interface InvocationHandler

Parameters:

proxy - proxy on which method is invoked.

method - instance of Method describing method being invoked.

args - array with arguments.

Returns:

result of method invokation.

Throws:

Throwable - if invoked method threw an exception.

checkCorrectness

protected void checkCorrectness(Method method)
                         throws SQLException

Check if method call is correct. If method was declared in PreparedStatement class and there is no connection proxy associated with this statement (i.e. statement in in pool), exception is thrown (this situation usually happens if somebody tries to call method on prepared statement after it has been closed).

Parameters:

method - method to check.

Throws:

SQLException - if statement has incorrect statement.