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this little requirement is enough to lead us to discard the option of making the object available by value As an MBR object, the remotable class can be client-activated or server-activated What's better to us The ServiceSalesProvider class doesn't need a nondefault constructor, so both clientactivated and server-activated modes are fine The object is expected to work as a oneoff service and has no need to maintain per-client state, so you can discard the clientactivated option and go for the server-driven activation OK, but should you opt for Singleton or SingleCall SingleCall that is, a short-lived instance that serves the request and dies is certainly an option If you use the object as a Singleton, however, you can architect slightly more efficient code and avoid having to query SQL Server each and every time a request comes in.

XSD into a spreadsheet range. You can map two XSD files next to each other on the same worksheet, but they can t overlap.

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The remoting code included in this book's sample files makes use of the ServiceSalesProvider class configured to run as a SingleCall object Memory Management SingleCall objects present no problems in terms of memory management They require a new object instance that is extremely volatile and does not survive the end of the method's code Singleton and client-activated objects, on the other hand, need a mechanism to determine when they can be safely destroyed In COM, this issue was resolved by implementing reference counting In the NET Remoting system, the same tasks are accomplished using a new module: the LM Unlike reference counting, the LM works on a per-AppDomain basis and allows objects to be released even though clients still hold a reference Let's quickly review the differences between these two approaches.

If you wish to link additional boxes, you can do so by clicking the Create Text Box Link button. The links function as a chain. This means each box must be linked to the box before it, not to the first text box. Once you ve created your links, enter the text in the first box. Word automatically flows the text between the boxes. As you edit it, the text automatically reflows. You can use the Next Text Box and Previous Text Box buttons to move between the linked boxes. It can prove tricky to remove a box from the middle of a linked chain of boxes. To remove a box without breaking the flow, right-click its border and select Cut. The box is removed, and the text reflows.

When you import an XML file, the file must include a reference to the XSD file used in the map. The following version of message.xml includes a reference (lines 3, 4, and 5) to two XML namespaces and the XSD file message.xsd. The namespace (xmlns) must be a valid domain. The schema location (line 5) ends with the name of the XSD file:

Old-Fashioned Reference Counting Reference counting requires clients including, of course, distributed and remote clients to communicate with the server each time they connect or disconnect The object maintains the number of currently active client instances, and when the count goes to 0, the object destroys itself In the presence of an unreliable network, however, chances are good that some objects might remain with a reference count that never goes to 0 If this weren't bad enough, the continual sequence of AddRef/Release calls would generate significant network traffic The Lease Manager (LM) The idea behind leasing is that each object instance is leased to the client for a given amount of time fixed by the LM The lease starts when the object is created By default, each Singleton or client-activated object is given 5 minutes to process incoming calls When the interval ends, the object is marked for deletion.

During the object's lifetime, however, any processed client call resets the lease time to a fixed value (by default, 2 minutes), thus increasing or decreasing the overall lease time Note that leasing is managed exclusively on the server and doesn't require additional network traffic, apart from the traffic needed for normal method execution The initial lease time and the renewal period can be set both programmatically and declaratively in the configuration file Getting a Sponsor Another mechanism for controlling an object's lifetime is sponsorship Both clients and server objects can register with the AppDomain's LM to act as sponsors of a particular object Prior to marking an object for deletion when its lease expires, the NET Remoting run time gives sponsors a chance to renew the lease By implementing 446.

< xml version="1.0" encoding="utf-8" > <MESSAGE xmlns="http://www.triadconsulting.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://triadconsulting.com message.xsd"> <TO>nwight@triadconsulting.com</TO> <CC>kmontgomery@boardworks.net</CC> <FROM>gcourter@triadconsulting.com</FROM> <DATE>06/01/06</DATE> <SUBJECT>New Office Location</SUBJECT> <BODY>Where should this item appear on the meeting agenda </BODY> </MESSAGE>

sponsors, you can control the lifetime of objects based on logical criteria rather than strict time intervals. In summary, nothing can guarantee that clients will always find their server objects up and running. When a remoting client attempts to access an object that is no longer available, a RemotingException exception is thrown. One way to resolve the exception is by creating a new instance of the remote object and repeating the operation that failed.

If you wish to break the link between a box and the one that follows, click the box. Then click the Break Forward Link button on the Text Box toolbar. This essentially creates two series of linked text boxes. The first series contains the text; the second series will be empty.

Let's see what a client must do to call a method on a remote object. To begin, add a project reference to the assembly that contains the remote object by rightclicking References in Solution Explorer, choosing Add Reference from the shortcut menu, and traversing the network to locate the target assembly. The project reference lets the client application know about the types defined in the assembly. Note Even if your remotable object is hosted by IIS, when you reference the assembly from a remoting client, choose the Add Reference option. The Add Web Reference command on the same shortcut menu is reserved for Web services and, more importantly, starts a completely different linking procedure. (More on this in 13.)

Follow these steps to import an XML file into the mapped worksheet: 1. Select a cell in the mapped range. 2. Choose Data XML Import from the menu. 3. Locate the XML file that you wish to import. 4. Click the Import button. Figure B-7 shows message.xml imported using the Excel map. Only the fields that were mapped are displayed. The headings were added manually.

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