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Download E-books Building Java Enterprise Applications, Volume 1: Architecture PDF

Posted On January 31, 2017 at 8:22 am by / Comments Off on Download E-books Building Java Enterprise Applications, Volume 1: Architecture PDF

By Brett McLaughlin

What are the major judgements and tradeoffs you face as you layout and strengthen firm purposes? How do you construct the again finish in order that it not just handles your present wishes yet is versatile sufficient to permit your process to adapt as your wishes extend? Building Java firm Applications, a sophisticated 3-volume advisor to construction advanced Java company functions from the floor up, offers the solutions. those sensible books take a step again from special exam of the APIs and concentrate on the full photograph, so that you can positioned the items jointly and construct anything that works! quantity 1: structure explores the infrastructure concerns so vital to stable program layout. It isn't only a booklet approximately Entity Beans and JNDI. It takes you step-by-step via construction the again finish, designing the information shop in order that it provides handy entry to the information your program wishes; designing a listing; understanding easy methods to deal with safety and the place to shop protection credentials you wish; etc. On best of this, it exhibits -- as simply as attainable -- how one can construct the entity bean layer that makes info to be had to the remainder of the appliance.

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Ejb. MessageDrivenBean; javax. ejb. MessageDrivenContext; javax. jms. JMSException; javax. jms. Message; javax. jms. MessageListener; javax. jms. ObjectMessage; javax. jms. consultation; javax. jms. subject; javax. jms. TopicConnection; javax. jms. TopicConnectionFactory; javax. jms. TopicSession; javax. jms. TopicPublisher; javax. naming. Context; javax. naming. InitialContext; javax. naming. NamingException; // occasion bean import com. forethought. ejb. occasion. EventInfo; // consumer bean import com. forethought. ejb. consumer. UserInfo; public type SchedulerBean implements MessageDrivenBean { */ /** The context for the message-driven bean, set by means of the EJB box deepest MessageDrivenContext messageContext; /** Required production strategy for message-driven beans */ public void ejbCreate( ) { // No motion required for message-driven beans } 169 Building Java™ firm functions quantity I: structure /** Required elimination technique for message-driven beans */ public void ejbRemove( ) { messageContext = null; } /** Required procedure for box to set context */ public void setMessageDrivenContext(MessageDrivenContext messageContext) { this. messageContext = messageContext; } public void onMessage(Message message) { attempt { // Convert to the right kind message kind ObjectMessage objectMessage = (ObjectMessage)message; // Dissect message String motion = objectMessage. getStringProperty("Action"); EventInfo eventInfo = (EventInfo)objectMessage. getObject( ); } // Dispatch sendEventNotification(action, eventInfo); } capture (JMSException e) { throw new EJBException(e); } capture (NamingException e) { throw new EJBException(e); } inner most void sendEventNotification(String motion, EventInfo eventInfo) throws JMSException, NamingException { // forget about deleted occasions if (action. equalsIgnoreCase("delete")) { go back; } // make sure that at the least one worker concerned boolean hasEmployee = fake; for (Iterator i = eventInfo. getAttendees(). iterator(); i. hasNext(); ) { UserInfo userInfo = (UserInfo)i. subsequent( ); if (userInfo. getType( ). equals("Employee")) { hasEmployee = actual; holiday; } } if (! hasEmployee) { go back; } // Get the customer subject vacation spot Context context = new InitialContext( ); TopicConnectionFactory manufacturing unit = (TopicConnectionFactory)context. look up( "java:comp/env/jms/TopicFactory"); subject subject = (Topic)context. lookup("java:comp/env/jms/EmployeeTopic"); // hook up with subject TopicConnection connection = manufacturing unit. createTopicConnection( ); one hundred seventy Building Java™ firm functions quantity I: structure // ship off notification of this occasion TopicSession consultation = connection. createTopicSession(false, consultation. AUTO_ACKNOWLEDGE); TopicPublisher writer = consultation. createPublisher(topic); // construct message ObjectMessage message = consultation. createObjectMessage( message. setObject(eventInfo); writer. publish(message); } } // pack up connection. shut( ); ); As you will discover, this bean does a few easy facts filtering yet now not even more. It makes use of the onMessage( ) option to devour any and all messages from the EventManager bean or the other writer to the Scheduler subject.

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