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Let s explore the features of the EJB 3 timer service by adding a timer to the PlaceBid EJB we introduced in chapter 2. We ll add a timer in the addBid method to check the status of the newly placed bid every 15 minutes. Although we won t code it, another compelling use case is to create a timer when an item is added for bidding. Such a timer could be triggered when the auction time expired and would determine the winning bidder. We ll leave the implementation of this timer as an exercise for you. Among other things, the timer we ll implement will notify the bidder via e-mail if they have been outbid. We have omitted most of the code that is not absolutely necessary to explain timer functionality in listing 5.3. The complete code is included in the downloadable code samples if you are interested in exploring further.

You want to ensure that a message in a queue is processed only after any previous message has finished processing.

public class PlaceBidBean implements PlaceBid { ... @Resource TimerService timerService; Timer service injected ... public void addBid(Bid bid) { ... Code to add the bid ... timerService.createTimer(15*60*1000, 15*60*1000, bid); ... Timer created } Timeout method ... @Timeout public void monitorBid(Timer timer) { Bid bid = (Bid) timer.getInfo(); ... Code to monitor the bid ... } }

We use EJB 3 resource injection to gain access to the timer service b. In the addBid method, after we add the bid we schedule a timer service callback to occur every 15 minutes C. The newly added Bid is attached as timer information when the timer is registered. At regular intervals, the monitorBid method is

While some business logic operated by a message-driven bean can process messages in any order, other business functions might need messages supplied in a specific order. For instance, you might want to process incoming JMS messages according to the order in which they were received to preserve a specific datadriven workflow. Each message can be a step in a workflow, and the next step cannot begin without the previous one completing. Refer to recipe 6.2 for a discussion of using message queues.

static { priceList.put( "CD", new Double(15.0) ); priceList.put( "DVD", new Double(20.0) ); } public static double getPrice( String reference ) { Double price = (Double) priceList.get(reference); return price.doubleValue(); } } The Catalog class records the price of each item in the priceList hash map. This table is indexed by the item references. The associated values are the item prices. The static code block initializes the priceList map with two items: a CD that costs US$15 and a DVD that costs US$20. The getPrice method returns the price of the item that was given as a parameter.

called by the timer service, which is designated with the @Timeout annotation D. The monitorBid method retrieves the Bid instance attached as timer information and monitors the bid. We ll explore EJB timer services details using listing 5.3 as a jumping-off point in the next few sections, starting with ways to get access to the EJB 3 timer service. Accessing the timer service As you just saw in listing 5.3, the EJB timer service can be injected into a Java EE component using the @Resource annotation. Alternatively, you can get access to the container timer service through the EJB context:

@Resource SessionContext context; ... TimerService timerService = context.getTimerService();

The client shown in listing 6.5 publishes messages onto a message queue for a message-driven bean to pick up.