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The FlightService implementation is defined inside this example s main applicationContext.xml. Normally, Dependency Injection would play a role in configuring your services, but for this simple example it is enough to simply define the bean. Later the web components of the application will be injected with this service, so it is important that the FlightService be accessible as a Spring bean. We are making a deliberate effort to separate our application beans from any web components by creating separate ApplicationContexts. This ensures an obvious separation between the different areas of the application. For instance, in Listing 4-7, we are defining the DummyFlightService bean in an ApplicationContext that is separate from any web components. Listing 4-7. applicationContext.xml < xml version="1.0" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="flightService" class="com.apress.expertspringmvc.flight.service.DummyFlightService" /> </beans>

You have added logging code to your entire EJB application, but now you ve noticed a performance degradation. Logging can affect the performance of your application in a number of ways. log4j is probably the fastest logger you can find, but depending on how you use it, you can hurt your application performance. The two most common areas that affect performance are the number of log messages and the construction of log messages.

This while loop then counts down from the counter value, decrementing by one each time, outputting the contents of each of the newly created variables. Thus we reverse the order of the lines from the input.

Summary

There are four ways to improve the log4j performance:

here are many ways to send script output to the screen or to a file. The technique demonstrated in this chapter for creating preformatted output is simple to code. Many times I have coded scripts that write entries to a log, create a configuration file, or generate formatted usage output one line at a time by redirecting the output of echo statements. This works perfectly well, but the code looks a bit ugly and becomes tedious; it is also laborious to make changes because each echo statement has to be formatted individually. The original version of the gold Linux build script in 38 was written in that way. It created a temporary file used to partition a hard disk by outputting each partition table entry individually. The script has since been updated to use the technique in this chapter. Here are some sample lines of the original code:

Before any work was done on the web layer, we first analyzed the use cases to develop both a domain object model and a service layer. Focusing first on these layers forces us to design the core of the system without dependencies on the web layer. We also are forced into keeping all of the core business logic in the object model. The two use cases influenced the FlightService interface, supporting both a read-only method (getSpecialDeals()) and a query-and-response method (findFlights()). As the last step, the FlightService implementation is defined as a Spring bean inside the applicationContext.xml so that it may be easily injected into our web components.

Adjust the logger level. Construct your messages economically. Use formatting with caution. Use a fast appender layout class.

"# partition table of /dev/hda" > $PARTTAB "unit: sectors" >> $PARTTAB >> $PARTTAB "/dev/hda3 : start=0,size=0,Id=0" >> $PARTTAB "/dev/hda4 : start=0,size=0,Id=0" >> $PARTTAB

With the service layer built, it is now time to expose the use cases to the web. In this section we will both create the classes and configure the web application to initialize and host the code.

Change the level of your loggers A large application might have thousands of log messages of varying levels. Modify your logging configuration file to output only the absolutely necessary messages into your logs. Disabling messages will improve the overall performance of your application. For example, if you have tested your application in production, you might want to turn off the debugging statements that are no longer necessary.

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