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interval. A single-action timer expires once, and an interval timer expires many times, at specified intervals. When a timer expires, the Timer Service calls the bean s ejbTime out() method or a callback method with @javax.ejb.Timeout. At this point, we are discussing only the expiration and duration parameters and their uses. The Serializable info parameter is discussed later in this chapter. When a timer is created, the Timer Service makes it persistent in some type of secondary storage, so it will survive system failures. If the server goes down, the timers are still active when the server comes back up. Although the specification isn t clear, it s assumed that any timers that expire while the system is down will go off when it comes back up again. If an interval timer expires many times while the server is down, it may go off multiple times when the system comes up again. Consult your vendor s documentation to learn how they handle expired timers following a system failure. The TimerService.getTimers() method returns all the timers that have been set for a particular enterprise bean. The getTimers() method returns a java.util.Collection, an unordered collection of zero or more javax.ejb.Timer objects. Each Timer object represents a different timed event that has been scheduled for the bean using the Timer Service. The getTimers() method is often used to manage existing timers. A bean can look through the Collection of Timer objects and cancel any timers that are no longer valid or need to be rescheduled.

How to Secure Administrative Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

17-25

Guidelines for Designing a Division of Management Duties. . . . . . . . . . . . . 4-22

will not deploy it to computers in the Phoenix and Los Angeles sites. In order to reach all users in the forest, you must apply the policy to each domain, or to each site.

To be durable, a business method must write all changes and new data to a permanent data store before it can be considered successful. This may seem like a no-brainer, but often it does not happen in real life. In the name of efficiency, changes are often maintained in memory for long periods of time before being saved on a disk drive. The idea is to reduce disk accesses which slow systems down and only periodically write the cumulative effect of data changes. Although this approach is great for performance, it is also dangerous because data can be lost when the system goes down and memory is wiped out. Durability requires the system to save all updates made within a transaction as the transaction successfully completes, thus protecting the integrity of the data.

whose users are located within those two OU hierarchies, but will not apply it to users in other OUs or to the litwareinc.com domain. A GPO will only apply to the users within the OU where it is applied; any users outside that OU will not be affected.

Guidelines for Designing Secure Administration Practices . . . . . . . . . . . . . 4-24

wareinc.com. A GPO will only apply to a single domain at a time, unless they are site attached, in which case the group policy is pulled from the domain where it was created but applied to users from any domain in that site.

Practice: Inspecting Administration Tools and Securing Their Use . . . . . . . . 4-38

Only when data is made durable are those specific records accessible through their respective entities from other transactions. Hence, durability also plays a role in isolation. A transaction is not finished until the data is successfully recorded. Ensuring that transactions adhere to the ACID principles requires careful design. The system has to monitor the progress of a transaction to ensure that it does all of its work, that the data is changed correctly, that transactions do not interfere with each other, and that the changes can survive a system crash. Engineering all of this functionality into a system is a lot of work, and not something you would want to reinvent for every business system on which you work. Fortunately, EJB is designed to support transactions automatically, making the development of transactional systems easier. The rest of this chapter examines how EJB supports transactions implicitly (through declarative transaction attributes) and explicitly (through the Java Transaction API, or JTA).