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Some older, non-GNU versions of tar will use absolute paths when extracting files. The next line of code shows an example of specifying the absolute path when creating an archive file: $ tar -cvf orahome.tar /home/oracle Specifying an absolute path with non-GNU versions of tar can be dangerous. These older versions of tar will restore the contents with the same directories and file names from which they were copied. This means any directories and file names that previously existed on disk will be overwritten. When using older versions of tar, it is much safer to use a relative pathname. This next example first changes directories to the /home directory and then creates an archive of the oracle directory (relative to the current working directory): $ cd /home $ tar -cvf orahome.tar oracle The previous example uses the relative path name. With non-GNU versions of tar, using the relative path is much safer than using absolute paths. You don t have to worry about absolute vs. relative paths on most Linux systems. This is because these systems use the GNU version of tar. This version will strip off the leading / and will restore files relative to where your current working directory is located. Use the man tar command if you re not sure whether you have a GNU version of the tar utility. You can also use the tar -tvf <tarfile name> command to preview which directories and files will be restored to what locations.

-(IBAction)buttonPressed:(id)sender { switch ([sender tag]) { case 0: /* * get operation count button pressed */ { NSArray *opArray = [workQueue operations]; [operationCountOutput setText:[NSString stringWithFormat:@"%d", [opArray count]]]; } break; case 1: /* * Add JobA button pressed */ [self addOp:jobA]; break; case 2: /* * Add JobB button pressed */ [self addOp:jobB]; break; case 3: /* * Add JobC button pressed */ [self addOp:jobC]; break;

Note In JPA 1.0, these annotations didn t exist. However, you were still able to store a list of primitive

You wonder whether there have been any changes to files in a directory since you last created a tar file.

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default: break; } } -(void)addOp:(JobUnit *)job { UIAlertView *alert; @try { [workQueue addOperation:job]; } @catch (NSException * exception) { alert = [[UIAlertView alloc] initWithTitle:@"NSOperationQueue Error:" message:[exception reason] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } } - (void)dealloc { [jobA release]; [jobB release]; [jobC release]; [workQueue release]; [super dealloc]; }

Use the -d (difference) option of the tar command to compare files in a tar file to files in a directory tree. The following example finds any differences between the tar file backup.tar and the scripts directory: $ tar -df backup.tar scripts The previous command will display any differences with the physical characteristics of any of the files. Here is some sample output: scripts/top.sql: Mod time differs scripts/top.sql: Size differs

types as a BLOB in the database. Why Because java.util.ArrayList implements Serializable, and JPA can map Serializable objects to BLOBs automatically. However, if you used java.util.List instead, you would have an exception as it doesn t extend Serializable. The @ElementCollection is a more elegant and useful way of storing lists of basic types. Storing lists in an inaccessible binary format makes it opaque to queries.

If you find differences and want to update the tar file to make it current, then use the -u option. This feature will update and append any files that are different or have been modified since the tarball was created. The next line of code updates or appends to the tar file any changed or new files in the scripts directory: $ tar -uvf backup.tar scripts The output indicates that the top.sql has been updated: scripts/ scripts/top.sql

Build and run it. When all the operations have finished executing you ll see the screen on the left side of Figure 1 14. Trying to add an operation that has finished executing will display the alert shown on the right. Operation objects are one shot deals. NOTE: Use this application to experiment with priorities, multiple queues, and setting the maxConcurrentOperationCount to the default value.

Like collections, maps are very useful to store data. In JPA 1.0, there was not much you could do with maps in terms of ORM. Now, maps can contain any combination of basic types, embeddable objects, and entities as keys or values, which brings significant flexibility to the mapping. But let s focus on maps of basic types. When the map employs basic types, the @ElementCollection and @CollectionTable annotations can be used in the same way as you saw previously with collections. A collection table is then used to store the data of the map. Let s take an example with a CD album that contains tracks (see Listing 3-28). A track can be seen as a title and a position (the first track of the album, the second track of the album, etc.). You could then have a map of tracks with an integer for the position (the key of the map) and a string for the title (the value of the map). Listing 3-28. A CD Album with a Map of Tracks @Entity public class CD { @Id @GeneratedValue private Long id; private String title; private Float price;

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