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Getting more information about SOAP A more detailed discussion of the SOAP protocol, encoding rules, and HTTP binding is beyond the scope of this book. We are primarily concerned with how to use SOAP from J2EE in this chapter. To learn more about what SOAP is and how it works in general, we refer you to the references on the subject that are cited in the bibliography. 4.3.3 Using JAXM for SOAP Messaging

Figure 21-9 The Performance Monitor can pro ide graphical information about your system s current and recent status.

The Performance Monitor can track everything from relatively mundane but core activities, such as processor time and disk access, to exotic and highly technical measurements, such as the number of nonpaging read bytes per second handled by the network

redirector. Whatever you decide to track, you add it to the Performance Monitor in the form of an object and a counter:

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Object This is any portion of a computer s resources that can be assigned characteristics and manipulated as a single identifiable element. Typical objects on most computers include the processor, memory, page file, and disks. The complete list of objects varies from system to system, depending on what hardware is installed, what network protocols are used, and so on. Counter This tracks various types of information about the objects to which they are assigned. The available counters vary from object to object. For the Processor object, for example, the available counters include % C1 Time, % C2 Time, % C3 Time, % DPC Time, % Idle Time, % Interrupt Time, % Privileged Time, % Processor Time, % User Time, C1 Transitions/sec, C2 Transitions/sec, C3 Transitions/ sec DPC Rate, DPCs Queued/sec, and Interrupts/sec.

Some objects can appear more than once in the Performance Monitor; each such counter is considered a separate instance, allowing you to measure and compare the same type of performance using different software processes or hardware devices. The Process object has an instance for each process that s running. The PhysicalDisk object has an instance for each physical disk installed in the computer, and so on. Objects that have multiple instances typically include an instance that supplies information about the total of all the individual instances. So, for example, you could create multiple instances of the IO Data Bytes/sec counter, which measures all data that a process reads and writes from all sources (disks, network, and devices). In this example, the counter that tracks total IO Data for all running processes would give you an accurate measurement of overall system performance; by adding counters for each running process, you could see if a particular process is responsible for more than its expected share of this total.

In sections 4.3.2 and 4.3.3, we examined the contents of SOAP messages transmitted between our manufacturer and distributor. We have not yet discussed how these messages are sent between our systems. For the purposes of our discussion, we assume that the communication is taking place between J2EE applications. Do not forget, however, that one of the more popular features of SOAP is its ability to integrate heterogeneous systems (e.g., Microsoft and J2EE applications). Currently, the only standard method for transmitting SOAP messages from Java is the Java API for XML Messaging (JAXM). JAXM, which we examined briefly in chapter 2, is currently being developed under the Java Community Process (JCP). JAXM is an API providing a standard mechanism for sending and receiving XML messages. The initial version of the JAXM specification supports SOAP 1.1 with Attachments, as described in the previous section. Although it is currently in an early access release, JAXM will provide a familiar mechanism for using SOAP within your J2EE components. The API is similar to the Java Messaging Service (JMS) in structure, defining connection factories to abstract JAXM clients from the underlying SOAP provider. As you will see in the examples, JAXM is based on the JDOM API we have been using throughout the book.

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