org.apache.ojb.broker.accesslayer
Class IndirectionHandler

java.lang.Object
  extended byorg.apache.ojb.broker.accesslayer.IndirectionHandler
All Implemented Interfaces:
java.lang.reflect.InvocationHandler, java.io.Serializable

public class IndirectionHandler
extends java.lang.Object
implements java.lang.reflect.InvocationHandler, java.io.Serializable

Version:
$Id: IndirectionHandler.java,v 1.23 2004/01/07 11:41:20 thma Exp $
See Also:
Serialized Form

Field Summary
(package private) static long serialVersionUID
           
 
Constructor Summary
IndirectionHandler(PBKey key, Identity oid)
           
 
Method Summary
 void addListener(MaterializationListener l)
           
protected  void afterMaterialization()
           
 boolean alreadyMaterialized()
          returns true if the real subject already been loaded
protected  void beforeMaterialization()
           
protected  PersistenceBroker getBroker()
          Gets the broker.
protected  PBKey getBrokerKey()
          Returns the brokerKey.
 Identity getIdentity()
           
 java.lang.Object getRealSubject()
          returns the proxies real subject.
 java.lang.Object invoke(java.lang.Object proxy, java.lang.reflect.Method method, java.lang.Object[] args)
          Processes a method invocation on a proxy instance and returns the result.
protected  void releaseBroker()
          release the PersistenceBroker
 void removeListener(MaterializationListener l)
           
protected  void setBrokerKey(PBKey brokerKey)
          Sets the brokerKey.
 void setRealSubject(java.lang.Object object)
          [olegnitz] This looks stupid, but is really necessary for OTM: the materialization listener replaces the real subject by its clone to ensure transaction isolation.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

serialVersionUID

static final long serialVersionUID
See Also:
Constant Field Values
Constructor Detail

IndirectionHandler

public IndirectionHandler(PBKey key,
                          Identity oid)
Parameters:
key - the PersistenceBroker Key
oid - the Identity
Method Detail

addListener

public void addListener(MaterializationListener l)

removeListener

public void removeListener(MaterializationListener l)

beforeMaterialization

protected void beforeMaterialization()

afterMaterialization

protected void afterMaterialization()

getIdentity

public Identity getIdentity()

getBroker

protected PersistenceBroker getBroker()
                               throws PBFactoryException
Gets the broker. If no PBKey is available a runtime exception will be thrown.

Returns:
a PersistenceBroker
Throws:
PBFactoryException

releaseBroker

protected void releaseBroker()
release the PersistenceBroker


invoke

public java.lang.Object invoke(java.lang.Object proxy,
                               java.lang.reflect.Method method,
                               java.lang.Object[] args)
Processes a method invocation on a proxy instance and returns the result. This method will be invoked on an invocation handler when a method is invoked on a proxy instance that it is associated with.

Specified by:
invoke in interface java.lang.reflect.InvocationHandler
Parameters:
proxy - the proxy instance that the method was invoked on
method - the Method instance corresponding to the interface method invoked on the proxy instance. The declaring class of the Method object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.
args - an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or null if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as java.lang.Integer or java.lang.Boolean.
Returns:
the value to return from the method invocation on the proxy instance. If the declared return type of the interface method is a primitive type, then the value returned by this method must be an instance of the corresponding primitive wrapper class; otherwise, it must be a type assignable to the declared return type. If the value returned by this method is null and the interface method's return type is primitive, then a NullPointerException will be thrown by the method invocation on the proxy instance. If the value returned by this method is otherwise not compatible with the interface method's declared return type as described above, a ClassCastException will be thrown by the method invocation on the proxy instance.
Throws:
PersistenceBrokerException - the exception to throw from the method invocation on the proxy instance. The exception's type must be assignable either to any of the exception types declared in the throws clause of the interface method or to the unchecked exception types java.lang.RuntimeException or java.lang.Error. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in the throws clause of the interface method, then an

getRealSubject

public java.lang.Object getRealSubject()
                                throws PersistenceBrokerException
returns the proxies real subject. The subject will be materialized if necessary. Creation date: (08.11.2000 21:42:40)

Throws:
PersistenceBrokerException

setRealSubject

public void setRealSubject(java.lang.Object object)
[olegnitz] This looks stupid, but is really necessary for OTM: the materialization listener replaces the real subject by its clone to ensure transaction isolation. Is there a better way to do this?


alreadyMaterialized

public boolean alreadyMaterialized()
returns true if the real subject already been loaded


getBrokerKey

protected PBKey getBrokerKey()
Returns the brokerKey.

Returns:
PBKey

setBrokerKey

protected void setBrokerKey(PBKey brokerKey)
Sets the brokerKey.

Parameters:
brokerKey - The brokerKey to set


Authors: Thomas Mahler and others. (C) 2000 - 2003 Apache Software Foundation
All rights reserved. Published under the Apache License.
http://db.apache.org/ojb
Version: 1.0.rc5, 2003-12-14