org.apache.jdo.impl.fostore
Class RollbackRequest

java.lang.Object
  extended byorg.apache.jdo.impl.fostore.AbstractRequest
      extended byorg.apache.jdo.impl.fostore.RollbackRequest
All Implemented Interfaces:
Request

class RollbackRequest
extends AbstractRequest

Represents a request to cause operations since the previous Commit or Rollback request to rollback.

Author:
Dave Bristor

Field Summary
protected  FOStoreSchemaUID fsuid
          uid corresponding to the same java.lang.Class that initializes jdoClass.
protected  JDOClass jdoClass
          Class meta data of the object represented by the constructor's given state manager
protected static int LENGTH_COOKIE
           
(package private) static org.apache.commons.logging.Log logger
          Logger
protected static I18NHelper msg
           
protected  FOStoreOutput out
          Stream to which request writes itself.
protected  FOStorePMF pmf
          PersistenceManagerFactory via which request is being done.
protected  StateManagerInternal sm
          The state manager which is the subject of this request.
 
Constructor Summary
(package private) RollbackRequest(Message m, FOStorePMF pmf)
           
 
Method Summary
 void doRequest()
          Does whatever it is that the kind of request does in actually making a request of the store.
protected  void doRequestBody()
          Provides the information ecessary for a RollbackRequest.
protected  RequestId getId()
           
 StateManagerInternal getStateManager()
          Get the StateManager associated with this request, null if none.
 void handleReply(Status status, java.io.DataInput in, int length)
          This should never be executed.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

sm

protected StateManagerInternal sm
The state manager which is the subject of this request.


pmf

protected final FOStorePMF pmf
PersistenceManagerFactory via which request is being done.


out

protected final FOStoreOutput out
Stream to which request writes itself.


jdoClass

protected JDOClass jdoClass
Class meta data of the object represented by the constructor's given state manager


fsuid

protected FOStoreSchemaUID fsuid
uid corresponding to the same java.lang.Class that initializes jdoClass.


msg

protected static final I18NHelper msg

logger

static final org.apache.commons.logging.Log logger
Logger


LENGTH_COOKIE

protected static final int LENGTH_COOKIE
See Also:
Constant Field Values
Constructor Detail

RollbackRequest

RollbackRequest(Message m,
                FOStorePMF pmf)
Method Detail

doRequestBody

protected void doRequestBody()
                      throws java.io.IOException
Provides the information ecessary for a RollbackRequest. The format of this request is (aside from the request header):
 empty: that's right, there's nothing here; the request's existence
 is alone enough to cause a rollback.
 

Specified by:
doRequestBody in class AbstractRequest
Throws:
java.io.IOException

handleReply

public void handleReply(Status status,
                        java.io.DataInput in,
                        int length)
                 throws java.io.IOException
This should never be executed. A RollbackRequest causes the reply data's header's Status value to indicate that the user requested a rollback, and when the reply handler sees that value, it does not invoke handleReply on any replies.

Parameters:
in - the input stream.
length - the length of data in the stream.
status - Indication as to the success, failure, etc. of the request as handled by the store.
Throws:
java.io.IOException - if any problems reading the stream.

getId

protected RequestId getId()

doRequest

public final void doRequest()
                     throws java.io.IOException
Description copied from interface: Request
Does whatever it is that the kind of request does in actually making a request of the store.

Specified by:
doRequest in interface Request
Throws:
java.io.IOException - in case of errors with the stream.
See Also:
Request.doRequest()

getStateManager

public StateManagerInternal getStateManager()
Get the StateManager associated with this request, null if none.

Specified by:
getStateManager in interface Request
Returns:
the StateManager.