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org.vrspace.server
Class Transaction  

java.lang.Object
  java.util.Observable
      org.vrspace.server.VRObject
          org.vrspace.server.DBObject
              org.vrspace.server.PassiveDBObject
                  org.vrspace.server.Transaction

All Implemented Interfaces:

java.lang.Cloneable, java.util.Observer

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public class Transaction

extends PassiveDBObject

implements java.util.Observer

Transacton: collects request from a client. Caches all objects. Able of rollback, rollforward, isolation... PassiveDBObject: can be stored to database, cannot send nor receive network events.

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Field Summary
(package private)  Client	client
(package private)  java.util.Hashtable	init
static int	LAST_COMMITED
(package private)  int	level
static int	LOCK_CLASS
static int	LOCK_OBJECT
(package private)  org.vrspace.util.Queue	requests

 

Fields inherited from class org.vrspace.server.DBObject

db

 

Fields inherited from class org.vrspace.server.VRObject

db_id, isNew, primitiveMap, primitives

 

Fields inherited from class java.util.Observable

 

Constructor Summary

Transaction()

 

Method Summary
void	commit()           Commit
void	rollback()           Rollback a transaction.
void	rollforward()           Rollforward - reply each request.
void	start(Client c)           Start a transaction with LAST_COMMITED lock level (no locking)
void	start(Client c, int level)           Start a transaciton.
private  void	unlockObj(VRObject obj)
void	update(java.util.Observable obs, java.lang.Object req)           Process a request from client.

 

Methods inherited from class org.vrspace.server.PassiveDBObject

sendEvent

 

Methods inherited from class org.vrspace.server.DBObject

delete, get, put, put

 

Methods inherited from class org.vrspace.server.VRObject

arrayToString, canRead, canWrite, clone, equals, fieldToText, fromString, fromText, getClassName, getField, getFields, getId, getID, getMemebers, hasField, hasMethod, isNew, lock, lockClass, newInstance, sendResponse, setField, setField, setField, setFields, setFields, setValue, stringToArray, toString, toText, toText, toText, unlock, unlockClass

 

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

 

Methods inherited from class java.lang.Object

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

 

Field Detail

init

java.util.Hashtable init

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requests

org.vrspace.util.Queue requests

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LAST_COMMITED

public static final int LAST_COMMITED

See Also:

Constant Field Values

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LOCK_CLASS

public static final int LOCK_CLASS

See Also:

Constant Field Values

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LOCK_OBJECT

public static final int LOCK_OBJECT

See Also:

Constant Field Values

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level

int level

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client

Client client

Constructor Detail

Transaction

public Transaction()

Method Detail

start

public void start(Client c)

Start a transaction with LAST_COMMITED lock level (no locking)

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start

public void start(Client c,
                  int level)

Start a transaciton. Starts listening to all changes that client made.

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update

public void update(java.util.Observable obs,
                   java.lang.Object req)

Process a request from client. Request is allready processed by Dispatcher and validated. Called by Client.
With LOCK_OBJECT or LOCK_CLASS isolation level, it means that object was not locked before.

Specified by:

update in interface java.util.Observer

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commit

public void commit()

Commit

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rollback

public void rollback()

Rollback a transaction. Calls VRObject.sendEvent() to set each field value, so rollback may be distributed.

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rollforward

public void rollforward()

Rollforward - reply each request. Calls VRObject.sendEvent().
This does not lock or unlock objects or classes

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unlockObj

private void unlockObj(VRObject obj)

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