IT-SC book: Advanced CORBA Programming with C++ in Software

Creation Code 39 in Software IT-SC book: Advanced CORBA Programming with C++
IT-SC book: Advanced CORBA Programming with C++
Code 39 Full ASCII Printer In Visual C#
Using Barcode drawer for VS .NET Control to generate, create ANSI/AIM Code 39 image in VS .NET applications.
request Then, finding none, it invokes its ServantActivator to obtain a servant After that, the servant is stored in the Active Object Map and the ServantActivator will not be invoked again for that target object The effects of the value of the IdUniquenessPolicy setting for this case are identical to the preceding case RETAIN with USE_DEFAULT_SERVANT The space overhead for this policy combination depends directly on how many associations are stored in the Active Object Map If most of the objects hosted by the POA are incarnated by the default servant, it means that there are few entries in the Active Object Map and storage requirements are minimized On the other hand, if the default servant incarnates only a few objects, the Active Object Map holds many entries Time overhead for servant lookup is slightly different for this case than for the preceding case because there is no ServantActivator to gradually fill the Active Object Map over time If a request arrives for an object that has no Active Object Map entry, the default servant is invoked, and the Active Object Map is not changed The effects of the value of the IdUniquenessPolicy setting for this case are almost identical to those for the preceding two RETAIN cases except for invocations made on the default servant If the default servant incarnates the target object, it must always obtain the target ObjectId from the POA Current NON_RETAIN with USE_SERVANT_MANAGER A NON_RETAIN POA has no Active Object Map, so storage requirements are minimized However, time overhead can be significant because for each request, the POA must invoke its ServantLocator to obtain a servant The amount of time required to obtain a servant depends almost entirely on the implementation of the ServantLocator Also, unless the ServantLocator uses some sort of servant pool to manage servant instances, it must create and destroy a new servant on the heap for each request This is not only costly in terms of time but may also increase the application's memory requirements due to heap fragmentation NON_RETAIN with USE_DEFAULT_SERVANT This policy combination minimizes both space and time overhead Space is minimized because the POA has no Active Object Map and all objects are incarnated with only a single servant The time required to locate the servant is minimized because the POA need only access its default servant However, a default servant must always determine the target ObjectId from the POA Current, so it may encounter time overhead due to thread-specific storage access 11145 Life Span Considerations
Code39 Drawer In .NET
Using Barcode generator for ASP.NET Control to generate, create Code 39 image in ASP.NET applications.
IT-SC book: Advanced CORBA Programming with C++
Encoding ANSI/AIM Code 39 In .NET
Using Barcode generator for .NET Control to generate, create Code 3 of 9 image in Visual Studio .NET applications.
Choosing whether your objects should be persistent or transient depends entirely on your application and the types of services it provides Applications typically fall into one of two general categories
Code 39 Maker In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
Service-Oriented Applications
Painting Code-128 In .NET
Using Barcode generation for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
Applications that are service-oriented tend to support persistent objects that are very long-lived and stable These objects are usually created once using either special options to the server program or using completely separate administrative programs After they are created, the objects are advertised in the Naming Service (see 18), the Trading Service (see 19), or some other object reference advertising service In fact, these services are themselves prime examples of service-oriented applications For example, the entire purpose of a Naming Service is to allow applications to access and modify the name bindings that have been registered with it The name bindings registered with the Naming Service are normally kept in persistent storage, typically some form of database Thus, a server that implements the Naming Service essentially presents the contents of this persistent storage as CORBA objects ORB implementations usually support the Naming Service by supplying options to the Naming server program that allow it to be used to create a persistent NamingContext object The resulting object reference can then be configured into the ORB as the root NamingContext that is returned from the ORB::resolve_initial_references method Service-oriented applications usually have two defining characteristics They are composed of long-lived objects that are created and destroyed via administrative tools The state of their objects is stored entirely within persistent storage Because such applications have persistent object state, they are almost always candidates for POA features such as servant managers and default servants, which allow applications to avoid creating a separate servant for each object they host ServantLocators are especially useful for service-oriented applications because their preinvoke and postinvoke operations allow persistent state to be loaded before a method call on the servant and to be written back to the persistent store after the call completes
Code-39 Maker In Visual Basic .NET
Using Barcode encoder for VS .NET Control to generate, create Code39 image in .NET applications.
Draw USS Code 39 In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
Paint Bar Code In VS .NET
Using Barcode printer for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Printing EAN / UCC - 14 In .NET Framework
Using Barcode encoder for .NET Control to generate, create USS-128 image in .NET framework applications.
Draw Barcode In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create bar code image in .NET framework applications.
Code-128 Creation In C#.NET
Using Barcode printer for .NET framework Control to generate, create Code 128 image in .NET framework applications.
Bar Code Creator In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create bar code image in .NET applications.
Printing Data Matrix ECC200 In Java
Using Barcode creation for Java Control to generate, create ECC200 image in Java applications.