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In this section, we will demystify the process of how communication is established between two application domains. To illustrate this, we will show how to build a service controller. A service controller is the equivalent of a Windows service manager that controls the startup, shutdown, and other maintenance-related activities of a service. The only difference between the Windows service manager and the service controller is that although the former is meant to manage application process, the latter is meant to control trading operation related services. A real-life example of trading operation related services is the heartbeat service (see Figure 5-8). The heartbeat service periodically monitors the heartbeat of the important trading components. For example, an order management system depends upon several subcomponents such as a bookkeeping service, an exchange routing gateway, and a market data service that are installed on a separate machine. In this type of environment, it is extremely important to keep a close watch on the health of all these services, and this is where the heartbeat service plays an important role. The heartbeat service forms the basic requirement of the trading operational requirements, and we will use this as the code example throughout the chapter.

Figure 5-8. The service controller and heartbeat service are loaded in a different application domain; communication between them takes place through remoting.

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Having parsed the XML, we are left with a document object (doc) that has various methods allowing for its exploration The one you ll likely use most often is an XPath-based iteration as in the following snippet, which continues on from Listing 7-5: docelementseach("*/word") { |element| puts elementtext } Rather unsurprisingly, this bit of code iterates through each word element and dumps the text out to the console What about determining the encoding mechanism for our document encoding = docrootattributes["encoding"] Notice that we are able to specify the root node of the XML tree (in this case the enctext node) as well as treat its attributes as an ordinary hash If we wanted only the first word, we could use this shortcut: puts docelements["*/word"]text which performs the same XPath search as before but returns only the first result.

This chapter provided a summary of the configuration and administration requirements for a Seam application. You started with a look at how the application server is configured to properly run Seam applications. You saw how the JBoss server can be configured to use Seam, and then explored the general issues with running Seam in a generic Java EE 5.0 application server and in a J2EE 1.4 application server. Next, you learned how a Seam application itself is configured, in terms of the libraries and configuration files that need to be present to Seam-enable an application. The various entries required in the standard Java EE deployment descriptors were described, along with the various Seam configuration files and how/why they are used. Once you ve read through this chapter, you should have an understanding of what it takes to get a working Seam environment and a basic Seam-enabled application configured. In the rest of the book, you ll study the capabilities that Seam provides, and how these various configuration areas are used to control how these capabilities work at runtime.

To build this example, you will need the three projects mentioned in Table 5-1. Table 5-1. LPC assembly structure

The interdomain communication between two processes or between two machines imposes a particular posture toward the composition of the class (in other words, adopting interface-based polymorphism). The interface defines a contract that needs to be adhered to by the class implementing it. This contract does not provide core implementation; rather, it defines a skeletal implementation of members and properties. The advantage of using the interface is that it decouples the caller from knowing the underlying class implementation, allowing the caller to communicate to any object instance of the class as long as it adheres to the defined contract. This particular posture of programming has already been well established and religiously followed in other distributed programming environments such as CORBA, DCOM, and so on. This class library contains shared interfaces that are referenced by both the service controller (LPC.ServiceHost) and the service provider (LPC.Services).

It is a fairly obvious point but it is worth stressing that an unsuccessful search of this kind would return nil something to be aware of when writing code that might have to cope with such an eventuality: first_word = docelements["*/word"] puts first_wordtext if first_word Another subtlety to be aware of is the need for specifically invoking the text method of an element The standard to_s method of an element produces the XML necessary to encode it so that the following cases are different:.

n this chapter, we re going to explore the core capabilities of Seam s component model, which is at the heart of all of the services provided by the framework. We ll do this in a practical way (of course), by building out a (slightly) more complete version of the Gadget Catalog application that I introduced in 1. As you move along in the chapter, you ll see me demonstrate the key capabilities of the Seam component model by adding these extensions to the Gadget Catalog application.

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