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Subject: RE: [sca-j] ISSUE 11: Semantics of getCallbackID() are underspecified
Hi, I fully agree with the proposal, but I am not sure I understand the concern of Michael raised during the meeting that different bindings may behave differently. I would expect that the only interraction with the binding will happen at point 5 when the proxy will invoke it, and before that everything should be one and the same and there is no problem to specify the semantics. @Michael - is there something that I am missing ? Best Regards Peter -----Original Message----- From: Barack, Ron [mailto:ron.barack@sap.com] Sent: Thursday, 4. October 2007 21:03 To: sca-j@lists.oasis-open.org Subject: [sca-j] ISSUE 11: Semantics of getCallbackID() are underspecified http://www.osoa.org/jira/browse/JAVA-11 -----Ursprüngliche Nachricht----- Von: Simon Nash [mailto:NASH@uk.ibm.com] Gesendet: Mittwoch, 26. September 2007 15:43 An: sca-j@lists.oasis-open.org Betreff: [sca-j] NEW ISSUE: Semantics of getCallbackID() are underspecified TARGET: Java Common Annotations and APIs specification, section "Java API" / {"CallableReference"} DESCRIPTION: The getCallbackID() method description doesn't specify the initial state of the returned value and the events that cause this value to change. Consider the following sequence of events: 1) A ServiceReference is created, either by injection or by ComponentContext.getServiceReference(). 2) getCallbackID() is called on the ServiceReference. 3) A type-safe reference (proxy) is created from the ServiceReference by CallableReference.getService(). 4) getCallbackID() is called on the ServiceReference. 5) A service call is made through the type-safe reference. 6) getCallbackID() is called on the ServiceReference. It seems reasonably intuitive that call 2) will return null and call 6) will return the system-generated callback ID that was used for the service call. It's less clear what call 4) will return. Does the system-generated callback ID get created and set into the ServiceReference as part of event 3) or as part of event 5)? The description of the getCallbackID() method should describe a "state model" for how the value returned would change based on other actions. PROPOSAL: At point 2) the value returned will be null. At point 4, it will still be null, At point 6), it will be the system-generated callback ID that was used for the service call 5). This information should be stated explicitly in the description of getCallbackID(). Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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