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To create an asynchronous process, EJB clients can make use of a session bean that uses the EJB timer service. The session bean implementation class in listing 4.13 provides a single method, startProcess(), that creates a timer in order to trigger business logic.

The PINGLIST variable holds a list of IP addresses situated in a route architecturally beyond the switches to which the redundant interfaces are attached. All PINGLIST addresses should refer to systems that are always running, such as core network routers. The variable can specify any number of IP addresses. Having a single address doesn t give enough redundancy, whereas two or three do. I used three router addresses outside our local subnet. The PING_COUNT and SLEEPTIME variables describe the number of pings to use for each of the addresses in the PINGLIST and the amount of time to sleep between network checks. The MAILLIST variable is a comma-delimited list of mail addresses that will be sent a notification when any failover takes place. The ping utility has operating system dependent command-line switches that are used when sending specific numbers of ping packets to a system. This check determines the OS of the system the script is running on. It then sets a variable containing the appropriate ping switch.

The basic definition of a unit test is a discrete test condition to check correctness of an isolated software module Although we believe that this statement is correct, there is perhaps a better way to define a unit test We argue that a test should strive to follow these tenets if it is truly to be called a unit test: Run fast: A unit test must run extremely fast If it needs to wait for database connections or external server processes, or to parse large files, its usefulness will quickly become limited A test should provide an immediate response and instant gratification Zero external configuration: A unit test must not require any external configuration files not even simple text files The test s configurations must be provided and set by the test framework itself by calling code.

public class AsynchBean implements SessionBean,TimedObject { private SessionContext ctx; //other bean methods not shown public void startProcess( Serializable arguments ) { TimerService timerService = ctx.getTimerService();

if [ "`uname | grep -i hp`" != "" ] then ping_switch="-n" elif [ "`uname | grep -i linux`" != "" ] then ping_switch="-c" fi

The intent is to minimize both the runtime of the test and to eliminate external dependencies (which can change over time, becoming out of sync with the test) Test case conditions should be expressed in the test framework, creating more readable test conditions Run independent of other tests: A unit test must be able to run in complete isolation In other words, the unit test can t depend on some other test running before or after itself Each test is a stand-alone unit Zero external resources: A unit test must not depend on any outside resources, such as database connections or web services Not only will these resources slow the test down, but they are outside the control of the test and thus aren t guaranteed to be in a correct state for testing Leave external state untouched: A unit test must not leave any evidence that it ever ran.

Timer timer }

When you enter command mode you start at the bottom of your history and press the K key to move back up through the list Pressing the J key moves you forward (down) through the history list Once you have found the desired command, you can make any appropriate modifications and press Enter to run the command One last command-history function that has been extremely valuable to me is the ability to search for previous commands that match a pattern You do this search in the same way as a search in a vi session First you press Escape to change to command mode and then you press the forward slash (/) This gives you an opportunity to type in a substring to search for within the commands in the history stack.

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