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As stated previously in this chapter, to improve the reliability of the application in a distributed environment, which is by nature subject to service interruptions, it is important to implement policies such as retry or cache. Since we have eliminated the business delegate pattern, these policies cannot be implemented in the delegate any longer; they must be implemented in aspects. AOP offers a natural framework to separate some subconcerns within the main remote communication concern. For instance, it is possible to separate retry and cache within two independent aspects. This design choice depends on the designers and their needs. It must be done after a careful analysis of the maintainability and evolution needs. The aspect shown in Listing 12-7 implements a retry policy for account creation in the case of a physical communication error between the client and the server. This aspect can be considered as a simple fault tolerance aspect. Listing 12-7. The Retry Aspect 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 package aop.j2ee.client.java.aspect; import import import import import import java.math.BigDecimal; java.rmi.RemoteException; java.util.Date; aop.j2ee.business.session.bank.Bank; aop.j2ee.commons.exception.*; aop.j2ee.client.java.aspectized.Simple; qr code reader java source code Free Qr Code Reader Nokia X2 Java Apps - Mobiles24
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Scan and write your QR codes using this app** ... QR code scanner Antidote Inc. 3.0. Download · More. Application description. **Scan and write your QR codes ... The true magic of the code in listing 2.8 lies in the EntityManager interface. One interesting way to think about the EntityManager interface is as an interpreter between the object-oriented and relational worlds. The manager reads the ORM mapping annotations like @Table and @Column on the Bid entity and figures out how to save the entity into the database. The EntityManager is injected into the PlaceBid bean through the @PersistenceContext annotation b. Similar to the name parameter of the @Resource annotation in listing 2.5, the unitName parameter of the @PersistenceContext annotation points to the persistence unit specific to ActionBazaar. A persistence unit is a group of entities packaged together in an application module. You ll learn more about persistence units in chapters 9 and 11. In the save method, the EntityManager persist method is called to save the Bid data into the database C. After the persist method returns, a SQL statement much like the following is issued against the database to insert a record corresponding to the bid: public aspect Retry { pointcut retry(String customerId,String type,String description, BigDecimal balance,BigDecimal creditLine, BigDecimal beginBalance, Date beginBalanceTimeStamp): call(public String Bank+.createAccount(..)) && within(Simple) && args(customerId,type,description, balance,creditLine,beginBalance,beginBalanceTimeStamp); String around(String customerId,String type,String description, BigDecimal balance,BigDecimal creditLine, BigDecimal beginBalance,Date beginBalanceTimeStamp) throws RemoteException,IllegalAccountTypeException, CustomerNotFoundException,InvalidParameterException: retry(customerId, type, description, balance, creditLine, beginBalance, beginBalanceTimeStamp) { String result=null; try { result = proceed(customerId,type,description, balance,creditLine,beginBalance,beginBalanceTimeStamp); } catch (RemoteException ex) { INSERT INTO BIDS (BID_ID, BID_DATE, BIDDER_ID, BID_AMOUNT, ITEM_ID) VALUES (52, NULL, 60, 20000.50, 100) //perform business logic for batch process below (not shown) //update status as needed } } It might be instructive to look back at listing 2.7 now to see how the EntityManager figures out the SQL to generate by looking at the object-relational mapping annotations on the Bid entity. Recall that the @Table annotation specifies that the bid record should be saved in the BIDS table while each of the @Column annotations in listing 2.7 tells JPA which Bid entity field maps to which column in the BIDS table. For example, the bidId property maps to the BIDS.BID_ID column, the bidAmount property maps to the BIDS.BID_AMOUNT column, and so on. As we Summary java read qr code from camera How to Generate or Read QR code Dynamically using JAVA ...
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