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If you need to load default values from the database into a child object, the NewEditableChild() factory method must call DataPortal.Create(), and the object must implement a DataPortal_ Create() method just like an editable root object. Because this is a child object, the DataPortal_ Create() method would need to call MarkAsChild(), as shown here: Protected Overrides Sub DataPortal_Create() MarkAsChild() ' TODO: load default values here MyBase.DataPortal_Create() End Sub The rest of the Child_XYZ methods (Fetch, Insert, Update, and DeleteSelf) will all run on the application server and can assume they have access to the database. You can choose to use the ObjectFactory with a child object as well, if you want to supply an object factory class. In this case, you would not implement a DataPortal_Create() method in the business class but instead would implement a Create() method in the object factory class. The object factory class would look like this: Public Class MyChildFactory Inherits Csla.Server.ObjectFactory Public Function Create() As Object Dim result As New EditableChild() ' initialize the new object with default data MarkNew(result) MarkAsChild(result) Return result End Function End Class This is mostly the same as the code I described earlier for an editable root. The differences here are that only the Create() method is implemented and the MarkAsChild() method is called to mark the new business object as a child object.

The first question that most people think of when confronted with WAL technologies is usually But when does the data ultimately get written to the database We re glad you asked. Obviously, a neverending stream of changes being written to a constantly growing WAL file wouldn t scale or withstand the vagaries of file system failures. The WAL uses a checkpoint function to write changes back to the database. This process happens automatically, so the developer need not concern themselves with managing the checkpointing and write-back to the database. By default, the WAL invokes a checkpoint when the WAL file hits 1,000 pages of changes. This can be modified to suit different operating scenarios.

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Message time stamps are added to an outgoing SOAP request message by the sender. They help in detecting unauthorized SOAP message requests. The client may choose to set an expiration date and time on the request message, which means that the message is only valid for a specific number of seconds after it is issued. This ensures that if the SOAP message is intercepted and re-sent by an unauthorized sender, it will only be useful to them for a limited amount of time. And, of course, if the message expiration is set short enough, there will not be time for an unauthorized party to intercept and reroute the message. Message time stamps

The data portal manages the state of the business object automatically. Table 5-2 shows the state of the object after each Child_XYZ method. The only exception is that if you use the ObjectFactory attribute to initialize a new child object with values from the database, then the object factory will be responsible for setting the business

Because changes now write to the WAL file, rather than the database file, you might be wondering how this affects SQLite concurrency. The good news is the answer overwhelmingly for the better! New readers accessing data from the WAL-enabled database initiate a lookup in the WAL file to determine the last commit record. This point becomes their end marker for read-only consistency, such that they will not consider new writes beyond this point in the file. This is how the read becomes a consistent read it simply takes no notice of anything after the commit considered its end marker. Each reader assess is independent, so it s possible to have multiple threads each with a different notion of their own individual end mark within the WAL file. To access a page of data, the reader uses a wal-index structure to scan the WAL file to find out whether the page exists with changes and uses the latest version if found. If the page isn t present in the WAL file, it means it hasn t been altered since the last checkpoint, and the reader accesses the page from the database file. The wal-index structure is implemented in shared memory, meaning that all threads and processes must have access to the same memory space. That is, your programs must all execute on the same machine in order to access a WAL-enabled database or, more accurately, to use the wal-index. This is the feature that rules out operation across network file systems like NFS. As for writers, thanks to the sequential nature of the WAL file, they simply append changes to the end. Note, however, that this means they must take it in turn appending their changes, so writers can still block writers.

object s state as it is created. Even in that case, the data portal will still manage the child object s state for fetch, insert, update, and delete operations.

and expiration are a useful first defense for preventing the unauthorized use of legitimate SOAP messages. As added protection, the client may digitally sign both the message body and the time stamp directly. This allows the receiving service to detect a scenario wherein the time stamp itself was tampered with and altered by an unauthorized user.

Child_Create() Child_Fetch() Child_Insert() Child_Update() Child_DeleteSelf()

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