Ibm SC34-6814-04 Manual do Utilizador descarregar pdf (Página 653)

on the local EJB/CORBA server, that issues a request for another bean. What

happens next depends on whether or not the target object belongs to the local

EJB/CORBA server:

v If the request is for an object owned by the local EJB/CORBA server (that is, the

CORBASERVER name on the REQUESTMODEL definition is the name of the

local CorbaServer):

– If the transaction attribute of the called method does not require the caller’s

unit of work to be suspended and resumed around the call, for optimization

reasons the called method executes on the local (requesting) region. The

distributed routing program is not invoked.

– If the transaction attribute of the called method requires the caller’s unit of

work to be suspended and resumed around the call, the called method may

be routed to another region. For eligible requests, the distributed routing

program is invoked for route selection on the requesting region.

v If the request is for an object owned by a remote EJB/CORBA server, CICS

passes the request to the remote server. For eligible requests, the distributed

routing program is invoked for route selection on the listener region of the remote

server.

Which requests can be dynamically routed?

Not all method requests for enterprise beans or CORBA stateless objects can be

routed dynamically. The distributed routing program is invoked for route selection

only when there is a “free choice” of target region. Requests for methods that are to

run under the same OTS transaction are always routed to the same AOR (even if

they are handled by different listener regions). Thus, the routing program is only

invoked for routing of method requests in two cases:

1. The method of the target object is to run under a new OTS transaction. (See

our definition of what constitutes a “new” OTS transaction, in the “Important”

labeled box above.)

2. The method of the target object is to run under no OTS transaction.

Note:

1. A new OTS transaction may be started by:

v The client

v The container for the duration of the method

v The target method—if the target is an instance of a session bean that

manages its own OTS transactions.

2. Whether the method of the target object is run under the client's (new or

existing) OTS transaction, under the target bean’s (new or existing) OTS

transaction, under a new OTS transaction created by the container for

the duration of the method, or under no OTS transaction, depends on a

combination of factors. For example:

v For enterprise beans:

– The setting of the target method’s transaction attribute

– The type of bean—stateful session or stateless session

– For stateful session beans, whether the target object has started an

OTS transaction during a previous method and, if so, whether it

has committed or rolled back the transaction.

v For CORBA stateless objects:

Chapter 18. Writing a distributed routing program 631

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