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Most of the utilities described in this chapter are frequently used by DBAs. Which utility you use for the task at hand depends on variables such as personal preference, standards defined for your environment, and features of the utility. For example, when downloading Oracle installation files, these are usually bundled with cpio; this of course means that you must be familiar with cpio. In other situations, you might use tar because the person receiving the file has requested that the file be in the tar format. DBAs spend a fair amount of time moving large numbers of files to and from database servers. To do your job efficiently, it s critical to be proficient with archiving and compression techniques. In this chapter, we cover common methods that database administrators utilize for bundling and compressing files. We also cover the basics of generating checksums and encrypting/ decrypting files. We felt these topics were appropriate in this chapter because DBAs often use checksums and encryption when working with bundled files that are transferred to other database administrators.

To explain how the code works in Listing 8-3, let s take a look at the sequence diagram shown in Figure 8-4 to see what happens when a client invokes the createCustomer() method. First of all, the container intercepts the call and, instead of directly processing createCustomer(), first invokes the logMethod() method. logMethod() uses the InvocationContext interface to get the name of the invoked bean (ic.getTarget()) and invoked method (ic.getMethod()) to log an entry message (logger.entering()). Then, the proceed() method is called. Calling InvocationContext.proceed() is extremely important as it tells the container that it should proceed to the next interceptor or call the bean s business method. Not calling proceed() would stop the interceptors chain and would avoid calling the business method. The createCustomer() is finally invoked, and once it returns, the interceptor finishes its execution by logging an exit message (logger.entering()). The same sequence would happen if a client invokes the findCustomerById() method.

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-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqual:@"isFinished"]) { // operation finished [operationOutput setText:[NSString stringWithFormat:@"%@%@",

This first example uses the tar utility with the -cvf options to bundle all files ending with the string .sql that exist in the current working directory: $ tar -cvf prodrel.tar *.sql The -c (create) option specifies you are creating a tar file. The -v (verbose) option instructs tar to display the names of the files included in the tar file. The -f (file) option directly precedes the name of the tar archive file. The file that is created in this example is named prodrel.tar. It s standard to name the tar file with the extension of .tar. If you want to include all files in a directory tree, then specify the directory name from where you want the tar utility to begin bundling. The following command bundles all files in the /orahome/scripts directory (and any files in its subdirectories): $ tar -cvf script.tar /orahome/scripts

Listing 8-3 defines an interceptor that is only available for CustomerEJB. But most of the time you want to isolate a cross-cutting concern into a separate class and tell the container to intercept the calls on several session beans. Logging is a typical example of a situation when you want all the methods of all your EJBs to log entering and exiting messages. To specify an interceptor, you need to develop a separate class and instruct the container to apply it on a specific bean or bean s method. To share some code among multiple beans, let s take the logMethod() from Listing 8-3 and isolate it in a separate class as shown in Listing 8-4. As you can see, LoggingInterceptor is a simple POJO that has a method annotated with @AroundInvoke. Listing 8-4. An Interceptor Class Logging a Method on Entering and Exiting public class LoggingInterceptor { private Logger logger = Logger.getLogger("com.apress.javaee6"); @AroundInvoke public Object logMethod(InvocationContext ic) throws Exception {

[operationOutput text], [object workMsg]]]; } if ([keyPath isEqual:@"operations"]) { // number of operations changed [operationCountOutput setText:[NSString stringWithFormat:@"%d", [[workQueue operations] count]]]; } }

Use the -x option to extract files from a tar file. Usually it s a good idea to first create a new directory and extract the files in the newly created directory. This way you don t mix up files that might already exist in a directory with files from the archive. This example creates a directory and then copies the tar file into the directory before extracting it:

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