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Table 21-2: JRas Trace Types in WebSphere JRas Trace Type Corresponding WebSphere Trace Type Event Event Event Entry/Exit Entry/Exit Entry/Exit Entry/Exit Entry/Exit Entry/Exit Debug
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TYPE_OBJ_CREATE TYPE_OBJ_DELETE TYPE_SVC TYPE_API TYPE_CALLBACK TYPE_ENTRY_EXIT TYPE_PRIVATE TYPE_PUBLIC TYPE_STATIC TYPE_MISC_DATA
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Message Loggers Message loggers differ from trace loggers in their support for message text localization The RASIMessageLogger interface provides the methods that enable localizable message logging Localizable message logging is based on standard Java resource bundles, which are described in detail in 39 Resource bundles are catalogs of messages that can be provided for different locales Each message has a key that identifies it, and each can have optional objects embedded into the message text Following are the RASIMessageLogger interface methods: String getMessageFile( ) Returns the filename for the currently used resource bundle void setMessageFile(String) Sets the message text resource bundle void message(long type, Object obj, String methodName, String key, Object[ ] params) Issues a message The parameters for this method are as follo ws: o type is one of the types shown in Table 21-1 o obj represents a class name (The logger invokes objgetClass() getName() unless you pass a string there in the first place) o methodName is a method name o key is the message key for the localizable message, and it is used in conjunction with the message file specified in the setMessageFile method o param represents objects that are to be substituted into the message text void msg(long type, Object obj, String methodName, String key, String file, Object params[ ]) Issues a message The parameters are identical to those of the preceding method, except that you can specify the resource bundle using the parameter file void textMessage(long type, Object obj, String methodName, String text, Object[ ] params) Issues a message whose text is specified as a parameter and not via the resource bundle, using the parameter text This, of course, implies that no localization is 359
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provided The meaning of the other parameters is the same as for the message method Note that, for convenience, the methods message, msg, and textMessage are provided in a variety of flavors that differ in the params parameter The API defines variants of each method with no parameters, one parameter, two parameters, or an array of parameters The latter form is the one described in the preceding list for each of these three methods Trace Loggers Trace loggers are represented by the RASITraceLogger interface This interface provides several methods for generating different types of traces: entry, exit, exception, and trace The parameters for the entry and exit methods are quite similar to those of the RASIMessageLoggertextMessage method The parameters include the trace type (one of the types shown in Table 21-2), the class name or object on which getClass()getName() is to be invoked, the method name, and additional optional parameters (either none, one, two, or an array of those) The trace method writes text messages as trace events The parameters are similar to entry and exit, except that a text string parameter is added before the optional parameters The exception method takes as parameters the trace type, the class name string (or a corresponding object), the method name, and an exception object This method then records the exception to the trace log The RASITraceLogger interface supports the notion of trace filtering by having an internal mask that indicates which trace events are to be logged This mask can be gotten and set using the getTraceMask and setTraceMask methods, respectively The latter method is invoked by the WebSphere Application Server based on the specified trace settings
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Trace Settings in WebSphere While messages are continuously logged, traces are not logged by default To control the logging of traces, the WebSphere Administrative Console provides the Trace Service entry under the application server This entry allows you to control the behavior of the trace mechanism, as shown in Figure 21-1
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Figure 21-1: Trace Service in the WebSphere Administrative Console Following are the parameters that can be set Trace String This string determines what traces are logged The strings are of the format component=type=action, where component is the component name, type is the type of messages (debug, entry/exit, or event), and action is either enable, disable, or inherit For example, to log all debug traces related to IBM's servlet personalization, you can add the line comibmservletpersonalization*=debug=enabled While you can edit this string directly, the console provides a friendly user interface for editing it Trace File Determines the file to which the trace information will be written You can select the standard output, the standard error, or any other file Trace Host Name The hostname on which the application server is running Trace Port A port to be used for tracing The default is 7000, but you can change this if any other application is using that port To simplify the task of designating the desired trace levels for different components, the Administrative Console provides a special interface, as shown in Figure 21-2 You invoke this interface by clicking the Edit button under the Trace String field (see Figure 21-1)
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Figure 21-2: Trace service settings As you edit the trace string, the Administrative Console provides a tree for browsing the various components that can be traced Once you select such a component, you can enable, disable, or "inherit" three different levels of messages (corresponding to those shown previously in Table 21-2) Selecting Inherit means that the component follows the behavior of its direct parent in the hierarchy of components (for example, the associated package, in the case of a class), or that of the group to which it belongs
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Web Application Logging Example To illustrate the wa y Web application logging is utilized, let's look at a simple example of a servlet that uses traces This servlet recognizes two parameters in its HTTP request: enum and denom It outputs the ratio of enum divided by denom You create the trace logger in the servlet init method, qualifying it with the organization name, the product name, the component name, and the fully package-qualified class name You also add the logger to a group called "CompleteReferenceBooks" In the doGet method, you include code for logging entry and exit This code is enclosed in an if statement that checks to see if entry/exit traces should be logged This potentially saves a few operations at runtime (for example, it saves the construction of the params array in the entry trace) If an exception is caught in the doGet method, you record it using the exception method of the trace logger package bookwebspherech21; 362
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import javaxservlet*; import javaxservlethttp*; import javaio*; import javautil*; import comibmras*; import comibmWebsphereras*; public class TracerServlet extends HttpServlet { RASITraceLogger traceLog; public void init(ServletConfig config) throws ServletException { superinit(config); comibmwebsphererasManager manager = comibmwebsphererasManagergetManager(); traceLog = "CompleteReference", mgrcreateRASITraceLogger("Osborne",
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"websphere", "bookwebspherech21TracerServlet"); manageraddLoggerToGroup(traceLog, "CompleteReferenceBooks"); } public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { String enum = requestgetParameter("enum"); String denom = requestgetParameter("denom"); if (traceLogisLoggable(RASITraceEventTYPE_ENTRY_EXIT)) { Object[] parms = { enum, denom }; traceLogentry(RASITraceEventTYPE_ENTRY_EXIT, "doGet", parms); } responsesetContentType("text/html"); int enumInt = (new Integer(enum))toInt(); int denomInt = (new Integer(denom))toInt(); 363 this,
PrintWriter out (responsegetOutputStream()); outprintln("<html>");
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