public SleepTest() 
{
		getLogger().debug(whoAmI() + "\tConstruct");
}

Default constructor for SleepTest. The Java Sampler uses the default constructor to instantiate an instance of the client class.

 public Arguments getDefaultParameters() 
{
		Arguments params = new Arguments();
		params.addArgument("SleepTime", String.valueOf(DEFAULT_SLEEP_TIME));
		params.addArgument("SleepMask", "0x" + (Long.toHexString(DEFAULT_SLEEP_MASK)).toUpperCase());
		return params;
}

Provide a list of parameters which this test supports. Any parameter names and associated values returned by this method will appear in the GUI by default so the user doesn't have to remember the exact names. The user can add other parameters which are not listed here. If this method returns null then no parameters will be listed. If the value for some parameter is null then that parameter will be listed in the GUI with an empty value.

 public SampleResult runTest(JavaSamplerContext context) 
{
		SampleResult results = new SampleResult();
		try {
			// Record sample start time.
			results.sampleStart();
			// Generate a random value using the current time.
			long start = System.currentTimeMillis();
			long sleep = getSleepTime() + (start % getSleepMask());
			results.setSampleLabel("Sleep Test: time = " + sleep);
			// Execute the sample. In this case sleep for the
			// specified time.
			Thread.sleep(sleep);
			results.setSuccessful(true);
		} catch (InterruptedException e) {
			getLogger().warn("SleepTest: interrupted.");
			results.setSuccessful(true);
		} catch (Exception e) {
			getLogger().error("SleepTest: error during sample", e);
			results.setSuccessful(false);
		} finally {
			results.sampleEnd();
		}
		if (getLogger().isDebugEnabled()) {
			getLogger().debug(whoAmI() + "\trunTest()" + "\tTime:\t" + results.getTime());
			listParameters(context);
		}
		return results;
}

Perform a single sample. In this case, this method will simply sleep for some amount of time. Perform a single sample for each iteration. This method returns a SampleResult object. SampleResult has many fields which can be used. At a minimum, the test should use SampleResult.sampleStart and SampleResult.sampleEndto set the time that the test required to execute. It is also a good idea to set the sampleLabel and the successful flag.

 public  void setupTest(JavaSamplerContext context) 
{
		getLogger().debug(whoAmI() + "\tsetupTest()");
		listParameters(context);
		sleepTime = context.getLongParameter("SleepTime", DEFAULT_SLEEP_TIME);
		sleepMask = context.getLongParameter("SleepMask", DEFAULT_SLEEP_MASK);
}

Do any initialization required by this client. In this case, initialization consists of getting the values of the SleepTime and SleepMask parameters. It is generally recommended to do any initialization such as getting parameter values in the setupTest method rather than the runTest method in order to add as little overhead as possible to the test.

 public  void teardownTest(JavaSamplerContext context) 
{
		getLogger().debug(whoAmI() + "\tteardownTest()");
		listParameters(context);
}

Do any clean-up required by this test. In this case no clean-up is necessary, but some messages are logged for debugging purposes.