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Figure 5 12. Modified sample web page using markup inspection Changes made through the developer tools can be saved to disk. The Element Source with Styles tool could be used instead to only save those elements and styles used by the document <div>.

The RAM footprint of the web server process serving the request includes all of the modules loaded by the web server (such as Apache s mod_mime, mod_rewrite, etc.) as well as the memory used by the PHP interpreter. The more web server and Drupal modules that are enabled, the more RAM used per request.

Because RAM is a finite resource, you should determine how much is being used on each request and how many requests your web server is configured to handle. To see how much real RAM is being used on average for each request, use a program like top to see your list of processes. In Apache, the maximum number of simultaneous requests that will be served is set using the MaxClients directive. A common mistake is thinking the solution to a saturated web server is to increase the value of MaxClients. This only complicates the problem, since you ll be hit by too many requests at once. That means RAM will be exhausted, and your server will start disk swapping and become unresponsive. Let s assume, for example, that your web server has 2GB of RAM and each Apache request is using roughly 20MB (you can check the actual value by using top on Unix or Task Manager on Windows). You can calculate a good value for MaxClients by using the following formula; keep in mind the fact that you will need to reserve memory for your operating system and other processes: 2GB RAM / 20MB per process = 100 MaxClients If your server consistently runs out of RAM even after disabling unneeded web server modules and profiling any custom modules or code, your next step is to make sure the database and the operating system are not the causes of the bottleneck. If they are, then add more RAM. If the database and operating system are not causing the bottlenecks, you simply have more requests than you can serve; the solution is to add more web server boxes.

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The IE developer tools not only allow for inspection of markup, but also for real-time manipulation of element layout and styles (Figure 5 13).

</cmp-field> <cmp-field> <field-name>submitted</field-name> <column-name>SUBMITTED</column-name> </cmp-field> <cmp-field> <field-name>lastModified</field-name> <column-name>LASTMODIFIED</column-name> </cmp-field> <unknown-pk> <unknown-pk-class>java.lang.Integer</unknown-pk-class> <read-only>true</read-only> <column-name>ID</column-name> <auto-increment/> </unknown-pk> <entity-command name="get-generated-keys" class="org.jboss.ejb.plugins.cmp.jdbc.keygen.JDBC30GeneratedKeysCreateCommand"> </entity-command> <!-- jboss 3.2 features --> <!-- optimistic locking does not express the exclusions needed --> </entity> </enterprise-beans> </jbosscmp-jdbc> Listing 9-14 shows the new Ticket entity bean configuration in the ejb-jar.xml. Notice description, display-name, ejb-name, persistence-type, cmp-version, abstract-schema-name, and transaction-type all match the values from the TicketBean s annotations. Also notice the local-home, local, and ejb-class elements are the classes generated by XDoclet. The entity description also contains a list of all CMP fields corresponding to the exposed entity attributes and a query based on the finder annotation shown previously in Listing 9-7. Depending on your configurations, you may also get a vendor-specific deployment descriptor. Listing 9-15 shows an example of a JBoss-specific deployment descriptor entry for the Ticket entity bean. ejb-name maps this configuration to the corresponding configuration in the ejb-jar.xml file. local-jndi-name is the JNDI name that can be used to look up the local home interface from JNDI. Most application servers need an additional application server specific deployment descriptor for CMP beans. Listing 9-16 shows JBoss s CMP deployment descriptor, jbosscmp-jdbc.xml. Notice it uses the jboss and ejb notations to map the entity bean to a table and JNDI datasource and then maps the entity fields to the table columns. Once XDoclet has finished and all the files have been generated, the Entity Beans node in the J2EE Perspective will be updated to include the new entity bean (see Figure 9-7).

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