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Now that we have looked at the implementer s view of REQUESTOR, CLIENT PROXY, and INVOKER, let s explore the internal message processing architecture of Axis. There are many tasks to be performed within a Web Services REQUESTOR and INVOKER, both for the request and reply of an invoked service: Within the REQUESTOR, the invocation has to be constructed, marshaled as an XML message, and handed to the CLIENT REQUEST HANDLER. When the reply has arrived, it has to be obtained from the CLIENT REQUEST HANDLER, de-marshaled, and handed back to the client.

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Within the server-side INVOKER, the invocation has to be received from the SERVER REQUEST HANDLER, a MARSHALLER has to be demarshal the SOAP XML text, the service has to be looked up and invoked, the reply has to be marshaled again as SOAP XML text, and it has to be handed back to the SERVER REQUEST HANDLER Invocations can either use a REQUESTOR-based invocation scheme (as in the first example above) or a CLIENT PROXY-based invocation scheme (as in the second example above using WSDL) Within both REQUESTOR and INVOKER there are many add-on tasks, for example integration with the access control mechanisms of the Web Server, logging, session handling, and many more There are several things we can observe: There are many different, orthogonal tasks to be performed for a message There is a symmetry of the tasks to be performed for request and reply.

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The three tasks, mentioned above, occur on client side and server side The invocation scheme and add-ons have to be extensible flexibly These forces are addressed in the Axis architecture by a combination of REQUESTOR, INVOKER, INVOCATION CONTEXT, INVOCATION INTERCEPTOR, and CLIENT/SERVER REQUEST HANDLER This message processing architecture is used both on client side and server side in its client and server variant, respectively The basic idea is to construct the messageprocessing scheme and any add-on service as chained handlers Handlers are ordered in a chain, and each invocation has to pass each handler in the chain, before it reaches the actual remote object Each handler supports an operation invoke that is executed when an invocation passes it (which means that the handler implements the pattern Command [GHJV95]) The handler chain is used to implement an INVOCATION INTERCEPTOR architecture, similar to the architecture described in [Vin02b].

Dim iCount As Integer iCount = DAODBEngineWorkspacesCount iCount = DAOWorkspacesCount iCount = DBEngineWorkspacesCount iCount = WorkspacesCount VB has its own application object called Global App, Screen, Forms, and other objects are all retrieved from methods on Global When you use AppTitle, you're actually using VBGlobalAppTitle, which is two bound calls When working with application objects, VB not only generates code that calls the implicit vtable function, it also generates code that ensures that the variable has been instantiated in response to the As New declaration The code you don't see before AppTitle performs the following tasks and repeats those tasks whenever you reference the global App object directly Dim tmpGlobal As VBGlobal If VBGlobal Is Nothing Then Set VBGlobal = New VBGlobal Set tmpGlobal = VBGlobal tmpGlobalAppTitle Set tmpGlobal = Nothing The second type of object to which you bind automatically is the Me object For example, when you place a command button on a form and enter Text1Text = "Power VB", Text1 is a function call, not a variable Unlike application objects, the implicit Me object is guaranteed to be instantiated and easily accessible as a local variable This results in less overhead for a function bound to the Me object than for a function bound to an application object The third type of hidden dot calls a default method or property To continue with the DAO example, Workspaces has an Item object as its default member function Workspaces(0)Name is actually three bound calls: DBEngine Workspaces, WorkspacesItem, and WorkspaceName If you watch the IntelliSense windows as you type, you can recognize default members as those with names that don't correspond to the name on which the window is anchored Typing Workspaces( opens a tip window that says "Item(Item) As Workspace" Moving the cursor one character to the left changes the window to "Workspaces As Workspaces" Since the bound name is different before and after the opening.

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