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transaction management contract, security contract, and the CCI.
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q A JCA resource adapter is specific to an EIS (Tibco) and is contained in a
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RAR file. The RAR is composed of the JAR files and native libraries required to deploy the resource adapter on a JEE container.
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q A JCA adapter interacts with a JEE server via system contracts. Seven types
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of system contracts can be used:
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q Connection management q Transaction management q Security q Life Cycle Management (JCA 1.5) q Work Management Contracts (JCA 1.5) q Message Inflow (JCA 1.5) q Transaction Inflow Contracts (JCA 1.5) q The connection management contract describes the interaction between
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a JEE container and the adapter with respect to pooling and tearing down
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connections. All JCA resource adapters supply two implementations with the adapter: a ConnectionFactory and a Connection class.
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q The transaction management contract provides a mechanism to propagate
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transactions that originate from inside an application server to an EIS. The transaction management contract can control transactions by creating local transactions that exist only on a particular EIS resource.
q The security contract enables the application server to connect to an EIS
using security properties composed of a principle (a user ID) and credentials (a password, a certificate).
q Life Cycle Management is handled by the ResourceAdapter interface in the
javax.resource.spi package. There are two methods in the ResourceAdapter interface that allow for life cycle management: start() and stop().
q The Work Management contract allows the resource adapter to submit work
to the application server. It does this by creating an object that extends the Work interface in the javax.resource.spi.work package.
q The Message Inflow contract allows the resource adapter to react to calls
made by the application server to activate and deactivate message endpoints.
q CCI: To retrieve and update data, JCA s CCI layer is used. The CCI APIs
establishing a connection to an EIS cover command execution on an EIS to provide Record/ResultSet interfaces, which encapsulate the query results and allow EIS metadata (the type of data) to be queried.
6: Legacy Connectivity
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all the choices carefully because there might be more than one correct answer. Choose all correct answers for each question.
Distinguish Appropriate from Inappropriate Techniques for Providing Access to a Legacy System from Java Technology Code Given an Outline Description of That Legacy System
1. For a system consisting of exclusively Java objects, which distributed technology would be most appropriate for communication A. CORBA B. RMI C. JNDI D. JavaBeans 2. Which of the following are true about the Interface Definition Language (IDL) A. Interfaces between CORBA objects can be specified using IDL. B. Applications can be implemented using IDL. C. Interfaces described in IDL can be mapped to other programming languages. D. Stubs and skeletons are written in IDL. 3. An object that implements the interfaces java.rmi.Remote and java.io.Serializable is being sent as a method parameter from one JVM to another. How would it be sent by RMI A. RMI will serialize the object and send it. B. RMI will send the stub of the object. C. Both A and B throw an exception. 4. The RMI compiler rmic runs on which of the following files to produce the stub and skeleton classes A. On the remote interface class file B. On the remote service implementation class file C. On the remote service implementation Java file D. On the remote interface Java file
Self Test
5. Which distributed object technology is most appropriate for systems that consist of objects written in different languages and that execute on different operating system platforms A. RMI B. CORBA C. DCOM D. DCE 6. Which of the following are used by Java RMI A. Stubs B. Skeletons C. ORBs D. IIOP 7. Which of the following is not a tier of a three-tier architecture A. Client interface B. Business logic C. Security D. Data storage 8. Which of the following is not true about RMI A. RMI uses the Proxy design pattern. B. RMI uses object serialization to send objects between JVMs. C. The RMI Registry is used to generate stubs and skeletons. D. The RMI client can communicate with the server without knowing the server s physical location.
6: Legacy Connectivity
SELF TEST ANSWERS
Distinguish Appropriate from Inappropriate Techniques for Providing Access to a Legacy System from Java Technology Code Given an Outline Description of That Legacy System
3 1. B is correct. RMI would be appropriate for communication between Java objects because it is built into the core Java environment. It is a built-in facility for Java, which allows you to interact with objects that are actually running on JVMs on remote machines on the network. A, C, and D are incorrect. CORBA is more extensive than RMI. Unlike RMI, objects that are exported using CORBA can be accessed by clients implemented in any language with an IDL binding. RMI is much more simple and straightforward than CORBA because it supports only Java objects. So where the facilities of CORBA are not required, it is preferable to go for RMI. JNDI and JavaBeans are not distributed object technologies. 3 2. A and C are correct. Interfaces between CORBA objects can be specified using IDL, but it is a language that can be used only for interface definitions. It cannot be used to implement applications. B and D are incorrect. We use other languages to implement the interfaces written in IDL. Interfaces written in IDL can be mapped to any programming language. CORBA applications and components are thus independent of the language used to implement them. Stubs and skeletons are not written; they are generated by the IDL compiler. Stubs and skeletons would be in the same language as the corresponding client or server. 3 3. B is correct. When you declare that an object implements the java.rmi.Remote interface, RMI will prevent it from being serialized and sent between JVMs as a parameter. Instead of sending the implementation class for a java.rmi.Remote interface, RMI substitutes the stub class. Because this substitution occurs in the RMI internal code, one cannot intercept this operation. A and C are incorrect. If the object had not implemented Remote, it would have been serialized and sent over the network. 3 4. B is correct. The RMI compiler, rmic, can be used to generate the stub and skeleton files. The compiler runs on the remote service implementation class file. A, C, and D are incorrect. 3 5. B is correct. CORBA is the most appropriate object technology for systems that use objects written in different languages, and it supports a variety of operating system platforms. A, C, and D; each works with specific platforms.
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