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Class semper.txlayer.exchange.ExchangeTransaction 

java.lang.Object
   |
   +----semper.txlayer.transaction.Transaction
           |
           +----semper.txlayer.exchange.ExchangeTransaction
public class ExchangeTransaction
extends Transaction
implements Serializable
this is the baseclass for performing exchanges. The exchange is done as a sequence of TransferTransaction.

Variable Index

o _cont
o _expectation
o _offeredAttributes
o _received_cont
o _requestedAttributes
o _role
o _txc
o NO_ROLE
Thee constants define the roles.
o ORIGINATOR
o RESPONDER

Constructor Index

o ExchangeTransaction()
Empty Constructor.
o ExchangeTransaction(Container)
Create an ExchangeTransaction from a Container.
o ExchangeTransaction(TransactionID)

Method Index

o getObject()
This method gives the Object that was received in the exchange.
o prepareOriginator(TXSubContext, AttributeSet, AttributeSet, Description)
This method must be called before a begin().
o prepareOriginator(TXSubContext, Description)
This method must be called before a begin().
o prepareResponder(TXSubContext, AttributeSet, AttributeSet, Description)
This method must be called before a begin().
o prepareResponder(TXSubContext, Description)
This method must be called before a begin().
o run()
This is the method we have to implement because we extend from Transaction.

Variables

o NO_ROLE 
 public static final int NO_ROLE
Thee constants define the roles.

o ORIGINATOR 
 public static final int ORIGINATOR
o RESPONDER 
 public static final int RESPONDER
o _cont 
 protected Container _cont
o _received_cont 
 protected Container _received_cont
o _role 
 protected int _role
o _expectation 
 protected Description _expectation
o _txc 
 protected TXSubContext _txc
o _offeredAttributes 
 protected AttributeSet _offeredAttributes
o _requestedAttributes 
 protected AttributeSet _requestedAttributes

Constructors

o ExchangeTransaction 
 public ExchangeTransaction()
Empty Constructor. Can be used.

o ExchangeTransaction 
 public ExchangeTransaction(TransactionID tid)
Parameters:
tid - The TransactionID the ExchangeTransaction should have.
o ExchangeTransaction 
 public ExchangeTransaction(Container c)
Create an ExchangeTransaction from a Container.

Parameters:
c - The Container.

Methods

o run 
 public void run()
This is the method we have to implement because we extend from Transaction. The exchange takes place here.

Overrides:
run in class Transaction
o prepareOriginator 
 public void prepareOriginator(TXSubContext txc,
                               Description expectation)
This method must be called before a begin(). Necessary to prepare one side as Originator.

Parameters:
txc - The context that contains means for communication.
expectation - The description of the goods we want to receive.
o prepareOriginator 
 public void prepareOriginator(TXSubContext txc,
                               AttributeSet offeredAttributes,
                               AttributeSet requestedAttributes,
                               Description expectation)
This method must be called before a begin(). Necessary to prepare one side as Originator.

Parameters:
txc - The context that contains means for communication.
secAttributes - The security attributes that are to be applied to each transfer.
expectation - The description of the goods we want to receive.
o prepareResponder 
 public void prepareResponder(TXSubContext txc,
                              Description expectation)
This method must be called before a begin(). It is necessary to prepare one side as Responder.

Parameters:
txc - The context that contains means for communication.
expectation - The description of the goods we want to receive.
o prepareResponder 
 public void prepareResponder(TXSubContext txc,
                              AttributeSet offeredAttributes,
                              AttributeSet requestedAttributes,
                              Description expectation)
This method must be called before a begin(). It is necessary to prepare one side as Responder.

Parameters:
txc - The context that contains means for communication.
secAttributes - The security attributes that are to be applied to each transfer.
expectation - The description of the goods we want to receive.
o getObject 
 public Object getObject()
This method gives the Object that was received in the exchange.

Returns:
The received object. 
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