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Finally, there is a call to the EJB's remove () method in the disconnect () plugin method:
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public void disconnect!) { Systemoutprintln("calling disconnect"); try { _traderremove(); Systemoutprintlnf"SimpleEJBBmk: EJB removed"); } catch(Exception e) { Systemerrprintln("SimpleEJBBmk: an exception has occurred when "trying to close an EJB conection:"); Systemerrprintln("SimpleEJBBmk: " + e); eprintStackTrace(Systemerr); _gcsetErrorlteration(true); _gcsetStop!teration(true); } }
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Special use of the GrinderContext parameter is made in this plugin, with the methods setErrorlteration (boolean) and setSkipIteration (boolean) These methods instruct the Grinder to log an error and jump to the next iteration, passing over the execution of the rest of methods in the current iteration This feature is introduced to reduce the number of errors produced For example, if the connect () method cannot instantiate the EJB, then the rest of methods will also generate supporting errors, so there is no point in executing the buy (), sell (), and disconnect () methods, and it's better to jump to the next iteration
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The Grinder Console
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The Grinder console is another program that the Troops developed It is a basic tool for control and monitoring of one or several Grinder instances The console can coordinate the synchronized start of several Grinders instances By setting the property grinder initialWait to true, the Grinder instance will wait until a signal from the Console arrives to start execution To start the Console you need to change the directory on the host machine to c: \wlsbook\src\clO and type setenv This will put the necessary files into the classpath To initiate the console from here type the Java com ejbgrinder Console command To send the start signal from the Grinder console, just press the StartGrinder button on the console itself The Grinder instances can send performance data to the Console while they are running If the property grinder reportToConsole is set to true, the instances will send this information to be displayed by the console, as shown in the next figure:
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Stress Testing
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The Wonder Troops are pretty happy with the resulting test load application as it provides them with a free tool with which to test their application under stressful conditions They are aware that a lot can be improved in this application, particularly in the area of defining the test script They hope and expect readers to contribute their improvements and place them in the public domain
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A Testing Methodology
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Now that we have a tool, we need to have a consistent method to be able to test the behavior of the applications correctly The most important thing here is to be consistent across all the measurements For example, it does not matter if you state that a 2 foot ruler is actually 1 meter, as long as you always use that ruler for all your measurements
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The Business Transaction
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The first step is to define a business transaction This is a collection of URLs (in the case of an HTTP-based application) or methods (in the case of ajava-based client) that models the expected behavior of a typical visitor to your web site or application The intention is to talk about the performance of the application being measured in terms of the business transaction
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For example, in the case of an e-commerce web site, a typical visitor will search the catalog a few times, place a couple of goods in the shopping basket, order them, and check out In some cases, where there are various very well defined profiles of visitors, you can have more than one business transaction The business transaction does not have to exercise all the URLs or code of the application; it just has to replicate a typical usage of the application as closely as possible This means for example, that you should try to avoid the use of the same customer if this is used as a key for a critical database search Another example is not to place the same product in the shopping basket if the catalog is rather large, since this could be buffered in memory and produce a less realistic performance number by avoiding an actual database search The only thing that can safely be altered from a real customer's interaction is the think time It is logistically impractical to define think times of 2 or 3 minutes in a stress test, which is the case when some forms have to be filled The recommendation is to reduce these times to anywhere between 5 and 25 seconds, which will still do the trick by creating a necessary pause between the usage of URLs or methods
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