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If you build the class library with the linker flag /ASSEMBLYDEBUG, it is ensured that all referencing variables of a function s stack frame will be considered root references until the function returns. While this would solve the problem, it would also turn off this powerful optimization. As a more fine-grained alternative, you can make sure that the this pointer remains a root reference until the native function call returns. To achieve that, the function could be implemented as follows: double GetData() { double retVal = ::XYZGetData((HXYZ)this->hxyz); DoNothing(this); return retVal; } Since DoNothing is called after the P/Invoke function with the this tracking handle as an argument, the this argument of GetData will remain a root reference until the P/Invoke function returns. The helper function DoNothing could be implemented as follows: [System::Runtime::CompilerServices::MethodImpl( System::Runtime::CompilerServices::MethodImplOptions::NoInlining)] void DoNothing(System::Object^ obj) { } The MethodImplAttribute used here ensures that the JIT compiler does not inline the empty function otherwise the resulting IL code would remain the same as before and the function call would have no effect. Fortunately, it is not necessary to implement that function manually, because it exists already. It is called GC::KeepAlive. The following GetData implementation shows how to use this function: double GetData() { double retVal = ::XYZGetData((HXYZ)this->hxyz); GC::KeepAlive(this); return retVal; }

The method in listing 14.7 constructs a list of transfer objects of type BidTO c by executing a JDBC SQL statement b and returns d them to the client. Assuming you have created an entity named Bid that corresponds to the BidTO transfer object, you can easily migrate this method to use JPQL and the EntityManager API. You can use a dynamic query in the getBids method as follows:

public List getBids(Long itemId) { Item item = (Item)em.find(Item.class, itemId); Query query = em.createQuery("SELECT b FROM Bid b WHERE b.item = 1"); Query.setParameter(1, item);

return query.getResultList(); }

The finalization timing problem can also occur while the destructor calls XYZDisconnect. Therefore, the destructor should be modified, too. ~XYZConnection() { if (hxyz) { ::XYZDisconnect(hxyz); hxyz = 0; } GC::KeepAlive(this); }

However, we recommend using a named query instead of a dynamic query, and moving the JPQL statement to the Bid entity as a named query like this:

The purpose of Web services is to exchange and process XML messages, not to act as simple endpoints for remote procedure calls. In this chapter, you learned a six-step process for designing and building a message-oriented Web service from scratch: Step 1: Design the messages and the data types. Step 2: Build the XSD schema file for the data types. Step 3: Create a class file of interface definitions for the messages and data types. Step 4: Implement the interface in the Web service code-behind file. Step 5: Generate a proxy class file (for clients) based on the WSDL. Step 6: Implement a Web service client using a proxy class file. The goal of this chapter is to help you rethink your approach to Web services design so that you can start developing the type of message-oriented Web services that fit into an SOA framework.

@Entity @NamedQuery( name = "findBidsByItem", query = "SELECT b FROM Bid b WHERE b.item = 1") public class Bid implements Serializable { ... }

Use the named query in the getBids method of the BidDAOImpl class:

public List getBids(Long itemId) { Item item = (Item)em.find(Item.class, itemId); Query query = em.createNamedQuery("findBidsByItem"); Query.setParameter(1, item); return query.getResultList(); }

Another issue with finalization is called the graph promotion problem To understand this problem, you ll have to refine your view of the garbage collection process As discussed so far, the GC has to iterate through all root references to determine the deletable objects The objects that are not reachable via a root reference are no longer needed by the application However, these objects may need to be finalized All objects that implement a finalizer and have not suppressed finalization end up in a special queue called the finalization-reachable queue The finalization thread is responsible for calling the finalizer for all entries in this queue Memory for each object that requires finalization must not be reclaimed until the object s finalizer has been called Furthermore, objects that need to be finalized may have references to other objects The finalizer could use these references, too.