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public interface MessageExchangeContext
Context provided by the integration layer exposing partner communication to the BPEL engine. The BPEL engine may only invoke methods on this interface from a transactional context provided by the integration layer.
The following partner communication scenarios are possible:
Method Summary | |
---|---|
void |
cancel(PartnerRoleMessageExchange mex)
Cancel an async/reliable partner-role message exchange. |
java.util.Set<InvocationStyle> |
getSupportedInvocationStyle(PartnerRoleChannel prc,
EndpointReference partnerEpr)
Get the supported invocation styles (see InvocationStyle ) for invoking the EPR provided
via a given channel. |
void |
invokePartnerReliable(PartnerRoleMessageExchange mex)
|
void |
invokePartnerTransacted(PartnerRoleMessageExchange mex)
|
void |
invokePartnerUnreliable(PartnerRoleMessageExchange mex)
Invoke a partner. |
void |
onMyRoleMessageExchangeStateChanged(MyRoleMessageExchange myRoleMex)
Method used to inform the integration layer that the state of a my-role message exchange has changed. |
Method Detail |
---|
void invokePartnerUnreliable(PartnerRoleMessageExchange mex) throws ContextException
Invoke a partner. This method is invoked by the BPEL engine when an <invoke>
construct is encountered.
The BPEL engine will only invoke this method from a transactional context. This method MUST NOT block for extended periods
(as it is called from within a transaction): to this end, actual invocation may be deferred or a synchronous operation may be
decomposed into two asynchronous "legs". The integration layer must provide a response to the message exchange via the
PartnerRoleMessageExchange.reply(Message)
, PartnerRoleMessageExchange.replyOneWayOk()
,
PartnerRoleMessageExchange#replyWithFailure(FailureType, String, Element)
PartnerRoleMessageExchange.replyWithFault(javax.xml.namespace.QName, Message)
, or
PartnerRoleMessageExchange#replyAsync()
methods.
Invocation of reliable, unreliable, and transactional transports should be treated differently. A brief description of how each of these scenarios could be handled follows.
Reliable transports are transports such as JMS or WS-RM. For these transports, the request should be enrolled in the current transaction. This necessarily implies that the request is deferred until the transaction is committed. It follows that for reliable request-response invocations the response to the invocation will necessarily be processed in a separate transaction.
Unreliable transports are transports such as HTTP. For these transports, where the operation is not idempotent it is typically required that "at most once" semantics are achieved. To this end the invocation could be noted and deferred until after the transaction is committed.
Transactional transports are those transports that support transaction propagation. For these transports, the invocation can
be processed immediately and the response provided to the engine via the PartnerRoleMessageExchange.reply(Message)
method.
mex
- engine-provided partner role message exchange representation, this object is valid only for the duration of the
transaction from which the #invokePartner(PartnerRoleMessageExchange)
method is invoked
ContextException
- if the port does not support the operationvoid invokePartnerReliable(PartnerRoleMessageExchange mex) throws ContextException
ContextException
void invokePartnerTransacted(PartnerRoleMessageExchange mex) throws ContextException
ContextException
void cancel(PartnerRoleMessageExchange mex) throws ContextException
mex
- message exchange that should be cancelled.
ContextException
void onMyRoleMessageExchangeStateChanged(MyRoleMessageExchange myRoleMex) throws BpelEngineException
BpelEngineException
MyRoleMessageExchange#invoke(Message)
java.util.Set<InvocationStyle> getSupportedInvocationStyle(PartnerRoleChannel prc, EndpointReference partnerEpr)
InvocationStyle
) for invoking the EPR provided
via a given channel.
partnerEpr
- partner's EPR
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