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The previous code generates a spline between the two middle points of four points. For bonus points, the following code shows how you can extend the spline:

The UI has a reference to the business object and calls its Save() method. This causes the business object to ask the data portal to save the object. The result is that a copy of the business object is made on the server, where it can save itself to the database. So far, this is pretty straightforward.

group by b.table_name, b.constraint_name ) cons where col_cnt > ALL ( select count(*) from user_ind_columns i where i.table_name = cons.table_name and i.column_name in (cname1, cname2, cname3, cname4, cname5, cname6, cname7, cname8 ) and i.column_position <= cons.col_cnt group by i.index_name ) /

Comparison and Equality Operations .................................................................................................215

Persist allows you to persist the workflow instance using the current workflow configuration settings. You can also specify areas where state should not be persisted with no-persist zones.

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Figure 1-2. Conceptual SOA solution The communication between the services and the consumer is in the form of XML messages that are qualified according to defined XSD schemas. XML messages are discrete entities that may be transported, rerouted, and referenced at any point along the business workflow. Messages promote higher levels of reliability and scalability because they can be stored, and the services that process the messages can append additional information, which provides for a clear and unambiguous chain of custody across the business workflow. In addition, messages can be queued in the event that a service is temporarily unavailable or backlogged. XML messages are unlike traditional remote procedure calls (RPCs), which do not provide a discrete structure for encapsulating a method request. Traditional RPCs cannot typically be cached or held in a queue to wait for a better time to service the request. Instead, traditional RPCs typically time out if the receiving component does not respond within the expected length of time. In addition, RPCs are not qualified to a reference schema (although they must conform to type libraries for custom data types). Here lies the first important lesson for developing SOA solutions: the Web services in the solution must be designed to be message-oriented rather than RPC-oriented. This topic is the exclusive focus of 3.

Figure 14-5. The misplaced orchestration 6. Right-click the Applications folder and select New Application, as shown in Figure 14-6.

Even though the XYZConnection implementation suggested so far looks straightforward, it contains a severe bug: there is a race condition between the finalizer thread and the threads using the managed wrapper. It can cause a call to the finalizer even though the native handle is still needed. Do not even consider implementing a finalizer unless you understand how to avoid this bug. To understand the finalization timing problem, it is necessary to have a certain understanding of the garbage collection process and some of its optimization strategies. Key to understanding garbage collection is the distinction between objects and referencing variables. In this context, referencing variables can be tracking handles (T^), tracking references (T%), variables of reference types that use the implicitly dereferenced syntax (T), interior pointers, and pinned pointers. To simplify the following explanations, I will summarize all these kinds of referencing variables as references. The GC is aware of all references and also of all objects on the managed heap. Since auto_handle variables, gcroot variables, and auto_gcroot variables internally manage tracking handles, the runtime is indirectly aware of those, too. To determine the objects that are no longer used, the GC distinguishes between root references and non-root references. A root reference is a reference that can directly be used by managed code.

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