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The interface definition for ICloudTableStorageService is shown in Listing 2-17. This interface expose four methods. One method is called TableContext() with return type of TableContext (we are going to define this new base class after the interfaces definitions), and the remaining three are basic data table I/O methods: Insert(), Update(), and Delete(). These three data table I/O functions accept the ICloudEntity type parameter. A class that implements the interface ICloudTableStorageService is used as the I/O service to expose the cloud table data. It is also responsible for resolving dependency issues (the relation between parent or child entity objects) during data table access in order to keep the integrity of the entire data structure. Listing 2-17. Interface ICloudTableStorageService Definition using using using using System; System.Collections.Generic; System.Linq; System.Text; CloudTableStorageService_WebRole.CloudTableStorageDataService Microsoft.Samples.ServiceHosting.StorageClient; CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; CloudTableStorageService_WebRole.CloudTableStorageDataContext;

.lookup("java:comp/UserTransaction"); try { SessionFactory factory = HibernateUtil.getSessionFactory(); tx.begin(); session = factory.openSession(); session.saveOrUpdate(book); tx.commit(); }catch (RuntimeException e) { try { tx.rollback(); }catch(RuntimeException ex) { System.out.println("**** RuntimeException in BookDaoImpl "); } throw e; } In JPA, the implementation is very similar to Hibernate: EntityManager manager = null; UserTransaction tx = (UserTransaction)new InitialContext() .lookup("java:comp/UserTransaction"); try { EntityManagerFactory managerFactory = HibernateUtil.getFactory(); manager = managerFactory.createEntityManager(); tx.begin(); manager.persist(book); tx.commit(); }catch (RuntimeException e) { try { if(tx != null) { tx.rollback(); } }catch(RuntimeException ex) { System.out.println ("Cannot rollback transaction"); } throw e; } finally { manager.close(); }

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In the previous section, you saw that methods that return a value must contain return statements. Void methods do not require return statements. When the flow of control reaches the closing curly brace of the method body, control returns to the calling code, and no value is inserted back into the calling code. Often, however, you can simplify your program logic by exiting the method early, when certain conditions apply. You can exit from a method at any time by using the following form of the return statement, with no parameters: return; This form of the return statement can be used only with methods declared void. For example, the following code shows the declaration of a void method called SomeMethod, which has three possible places it might return to the calling code. The first two places are in branches called if statements, which are covered in 9. The last place is the end of the method body. Void return type void SomeMethod() { ... If ( SomeCondition ) return; ... If ( OtherCondition ) return; ... } // Return to the calling code.

The following code shows an example of a void method with a return statement. The method writes out a message only if the time is after noon. The process, illustrated in Figure 5-5, is as follows: First the method gets the current date and time. (Don t worry about understanding the details of this right now.) If the hour is less than 12 (that is, before noon), the return statement is executed, and control immediately returns to the calling method. If the hour is 12 or greater, the return statement is skipped, and the WriteLine statement is executed. class MyClass { Void return type void TimeUpdate() { DateTime dt = DateTime.Now; // Get the current date and time. if (dt.Hour < 12) // If the hour is less than 12, return; // then return. Return to calling method. Console.WriteLine("It's afternoon!"); // Otherwise, print message. } static void Main() { MyClass mc = new MyClass(); mc.TimeUpdate(); } }

public interface ICloudTableStorageService { bool Insert(ICloudEntity entity); bool Update(ICloudEntity entity); bool Delete(ICloudEntity entity); TableContext TableContext(); } } The interface definition for ITableContext is shown Listing 2-18. This interface defines one property TableName with a get/set accessing pair and two methods, QueryEntitiesByPartitionKey() and QueryEntitiesByRowKey(). The return type for these two methods is ICloudEntity, and the input parameter is PartitionKey and RowKey respectively. ITableContext is the facade class of a cloud data storage table that is responsible for retrieving URL endpoint information during the table context construction. This interface defines the basic query function for retrieving the cloud storage table. Listing 2-18. Interface ITableContext Definition using using using using System; System.Collections.Generic; System.Linq; System.Text;

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