Remarks on the Activation Package in Java

Generator USS Code 39 in Java Remarks on the Activation Package
1015 Remarks on the Activation Package
Generating ANSI/AIM Code 39 In Java
Using Barcode creation for Java Control to generate, create Code 3 of 9 image in Java applications.
The javarmiactivation package is the most complex part of the RMI specification We have already discussed those parts of it which really constitute its external API and which are of practical use The rest of it is of no practical interest to the programmer and can be ignored The following discussion takes you "under the hood" of activation, for those who are interested 10151 How it really works Activation is itself a set of remote services, built "on top of" RMI Just like any other RMI application, it is built out of remote interfaces and implementations of remote services Most of these are part of the internal design, not part of the activation API used by Java programmers (other than those implementing Activation systems) Figure 102 shows all the components of the Activation system In the diagram, single ended arrows indicate RMI client/server relationships, with the arrow head located at the server end
Bar Code Generator In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
Figure 102 Activation block diagram detailed
Read Bar Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
You don't need to know much about this detailed version of the block diagram, or about most of the Activation package The following notes discuss the remaining interfaces, classes, and methods In general they are of no concern to RMI programmers unless they are implementing Activation themselves
Printing Code39 In Visual C#
Using Barcode creator for .NET framework Control to generate, create USS Code 39 image in VS .NET applications.
10152 Creating the activation group ActivationGroupcreateGroup is called by the activation system Calling it yourself is not generally appropriate The setup programs in Sun's activation tutorial used to create a group, but only because they used the wrong constructor for ActivationDesc, the one which doesn't take a groupID parameter, but uses the default activation group which must exist, otherwise an ActivationException is thrown[5] Creating the group in the setup program makes no sense; using the wrong constructor and then working around its behaviour is the wrong solution Use the constructor which does take an activation group ID
Code 39 Extended Drawer In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create Code-39 image in ASP.NET applications.
According to the implementation and the online JDK documentation This disagrees with several statements in the RMI specification, 748 The behaviour described in the specification was implemented in beta releases of JDK 12, but was changed prior to the release of JDK 12FCS This is probably the source of the confusion in the activation tutorial 10153 Simultaneous registration and export Activatable has constructors and exportObject methods which implement a simultaneous registration/export facility Activatable servers can simultaneously register and export themselves, or be simultaneously registered and exported by other code You must be running in an activation group, otherwise an ActivationException is thrown It is difficult to see the point of this feature It is simpler to keep registration code setup programs separate from activatable code No doubt there are times when you continually want to register new activatable servers, but consider the risk and costs of combinatorially exploding the number of activatable servers If you need to register and export a server immediately, you can already do it yourself with the rest of the activation API For the record, the registration/export constructors and exportObject methods correspond closely to the various constructors of ActivationDesc, without the ActivationGroupID parameter 10154 The ActivationGroup class All the non static ActivationGroup methods activeObject, inactiveGroup, inactiveObject, and newInstance implement the ActivationInstantiator interface Ignore them ActivationGroupDesc has a constructor with which you can specify an alternate implementation class for the associated ActivationGroup Ignore it "Rolling your own" implementation of ActivationGroup is impractical and unnecessary 10155 The ActivationGroupId and ActivationID classes ActivationGroupID and ActivationID both have public constructors Ignore them These items are obtained, not constructed:
Code-39 Drawer In .NET Framework
Using Barcode generation for .NET Control to generate, create Code 3/9 image in .NET framework applications.
ActivationGroupIDs are obtained on registering the group
Generating Code39 In VB.NET
Using Barcode generator for .NET framework Control to generate, create Code 39 image in .NET applications.
ActivationIDs are obtained in the "activation constructor", or via ActivatablegetID if the server is derived from Activatable; you can't construct ActivationIDs because you can neither create nor obtain an Activator
Generate DataMatrix In Java
Using Barcode maker for Java Control to generate, create Data Matrix image in Java applications.
10156 Remote interfaces ActivationInstantiator, ActivationMonitor, and Activator are remote interfaces implemented by ActivationGroup and two hidden internal classes respectively Ignore them ActivationSystem exports quite a few methods The only ones of interest are:
Code-128 Generation In Java
Using Barcode creation for Java Control to generate, create Code 128 Code Set B image in Java applications.
getActivationDesc and setActivationDesc getActivationGroupDesc and setActivationGroupDesc registerGroup and unregisterGroup unregisterObject
Encoding Bar Code In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
The registerObject method looks interesting, but in fact it is not much use, as it doesn't return a remote stub: use Activatableregister instead[6]
ANSI/AIM Code 39 Maker In Java
Using Barcode generator for Java Control to generate, create USS Code 39 image in Java applications.
This method calls ActivationSystemregisterObject and then constructs an activatable stub If you prefer complication, you could use ActivationSystemregisterObject and then ActivationIDactivate
Generating GS1 - 12 In Java
Using Barcode generator for Java Control to generate, create Universal Product Code version A image in Java applications.
Encode Industrial 2 Of 5 In Java
Using Barcode maker for Java Control to generate, create 2/5 Industrial image in Java applications.
Data Matrix ECC200 Encoder In Visual C#.NET
Using Barcode maker for .NET framework Control to generate, create Data Matrix image in .NET applications.
Generate Barcode In C#
Using Barcode creator for .NET Control to generate, create bar code image in Visual Studio .NET applications.
Encode ANSI/AIM Code 39 In VS .NET
Using Barcode printer for VS .NET Control to generate, create Code 39 image in Visual Studio .NET applications.