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Description Click this button to analyze the disk for fragmentation. After the analysis, the Analysis Display band provides a graphic representation of how fragmented the volume is. Click this button to defragment the disk. Defragmenting automatically performs an analysis. After defragmentation, the Defragmentation Display band provides a graphic representation of the defragmented volume. Additionally, you can view a report showing files that could not be defragmented.

Maintaining Disks with Disk Defragmenter, Check Disk, and Disk Cleanup 10-59

Auditable entity = (Auditable) it.next(); AuditLog.logEvent("create", entity, userId, session.connection()); } for (Iterator it = updates.iterator(); it.hasNext();) { Auditable entity = (Auditable) it.next(); AuditLog.logEvent("update", entity, userId, session.connection()); } } finally { inserts.clear(); updates.clear(); } } }

Figure 10-22 shows the Disk Defragmenter dialog box after you have analyzed the C drive. Windows XP Professional displays another Disk Defragmenter dialog box, indicating that you need to defragment the volume. You can view a report that shows more details about the fragmentation on your volume, close the dialog box and run the defragmenter at a later time, or defragment the volume now.

Figure 10-22

The Hibernate Interceptor API has many more methods than shown in this example. Because you re extending the EmptyInterceptor, instead of implementing the interface directly, you can rely on default semantics of all methods you don t override. The interceptor has two interesting aspects. This interceptor needs the session and userId attributes to do its work; a client using this interceptor must set both properties. The other interesting aspect is the audit-log routine in onSave() and onFlushDirty(): You add new and updated entities to the inserts and updates collections. The onSave() interceptor method is called whenever an entity is saved by Hibernate; the onFlushDirty() method is called whenever Hibernate detects a dirty object. The actual logging of the audit trail is done in the postFlush() method, which Hibernate calls after executing the SQL that synchronizes the persistence context with the database. You use the static call AuditLog.logEvent() (a class and method we discuss next) to log the event. Note that you can t log events in onSave(), because the identifier value of a transient entity may not be known at this point. Hibernate guarantees to set entity identifiers during flush, so postFlush() is the correct place to log this information. Also note how you use the session: You pass the JDBC connection of a given Session to the static call to AuditLog.logEvent(). There is a good reason for this, as we ll discuss in more detail. Let s first tie it all together and see how you enable the new interceptor.

If there is not enough fragmentation to require you to defragment the volume, Windows XP Professional displays a Disk Defragmenter dialog box, indicating that there is no need to defragment the volume at this time. The following list provides some recommended guidelines for using Disk Defragmenter:

Run Disk Defragmenter when the computer will receive the least usage. During defragmentation, data is moved around on the hard disk, and that process is microprocessor-intensive. The defragmentation process will adversely affect access time to other disk-based resources. Educate users to defragment their local hard disks at least once a month to prevent accumulation of fragmented files. Analyze the target volume before you install large applications and defragment the volume if necessary. Installations complete more quickly when the target media has adequate contiguous free space. Additionally, accessing the application after installation is faster. When you delete a large number of files or folders, your hard disk might become excessively fragmented, so be sure that you analyze it afterward. Generally, you should defragment hard disks on busy file servers more often than those on single-user client computers.

Enabling the interceptor You need to assign the Interceptor to a Hibernate Session when you first open the session:

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10

After this lesson, you will be able to:

AuditLogInterceptor interceptor = new AuditLogInterceptor(); Session session = getSessionFactory().openSession(interceptor); Transaction tx = session.beginTransaction(); interceptor.setSession(session); interceptor.setUserId( currentUser.getId() ); session.save(newItem); // Triggers onSave() of the Interceptor tx.commit(); session.close();