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However, it is a good tool for use in an environment where high availability and redundancy are key This script performs very well In testing, I was logged into the system through the network and, after executing some commands validating connection, I disconnected the primary interface cable The failover of the interface occurred in less than 10 seconds and my command-line session carried on as if nothing had happened Depending on when the interface failure occurs, the maximum time for a failover to complete would be about 15 seconds The script first checks network availability, sleeps for 10 seconds, wakes up and checks again, and continuously repeats this process The shortest amount of time the script could take to recognize and execute a failover is probably less than 5 seconds Most systems can take that amount of interruption without much impact.

brackets and we call the forProperty method and pass firstName as property name. Next we call the hasErrorCode method and pass in the error code we expect to be present in the Errors instance. If this error code cannot be found for the firstName property, an exception will be thrown. This notation is repeated for the lastName property. The hasErrorCode can be called more than once for a property and can also be used to check for global errors. Lastly the otherwise and noErrors() methods are called. These methods verify if no other errors than the one we expect are present in the Errors instance. The ErrorsVerifier class is very convenient to quickly test if your Errors instance contains the correct error codes after being passed to a Validator. Imagine the Java code you would have to write otherwise to test that the content of the Errors instance is as expected!

} catch (Exception e) { e.printStackTrace(); } } //other bean methods not shown }

Like in many scripts in this book, the configuration of variables happens in the script itself It would probably make for cleaner code to save the configuration information in a separate file, which can then be sourced from the script If this were done, you could change the values without interfering with the code..

Summary

Finally, the following pseudo-code shows how an EJB client can use the session facade to start an asynchronous process and check its progress as needed:

This first group of configuration variables sets up the log file where log entries for any potential network failures will be entered. The primary and secondary interface names are also defined. These names will change depending on your hardware and operating system. For instance, network interfaces on most Linux machines have names like eth0 or eth1. Other UNIX variants might use names such as iprb0 or en1. We also determine the system name so that failover messages can indicate the machine that had the problem. The following code sets the networking information. These are the settings that will be switched when a failure occurs:

Spring offers an excellent validation framework. The Validator and Errors interface form the backbone and allow you to write your own Validator implementations. If you d rather use declarative validation, have a look at Valang. This framework creates a Spring Validator instance based on a set of constraints defined in its proper validation language. Valang is very convenient to quickly write constraints for your command classes. Its operators, functions, and date parser functionalities offer more power and flexibility than Validators written in Java. Whether you write your Validators in Java or Valang, you should always test them to check whether all error conditions are rejected properly. Next to validation Spring also offers support for internationalization through its MessageSource interface. This interface will resolve messages for the locale of your users so that you can offer your applications in their languages.

//lookup session facade AsyncProcessRemote bean = lookupBean(); String processId = bean.startProcess(); //do something else for a while int status = bean.checkStatus( processId );

IP=`grep $ME /etc/hosts | grep -v '^#' | awk '{print $1}'` NETMASK=255.255.255.0 BROADCAST="`echo $IP | cut -d\. -f1-3`.255"

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