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Corba Interview Questions & Answers - Learning Mode

Corba Interview Questions & Answers - Learning Mode

CORBA is essentially a design specification for an Object Request Broker (ORB), where an ORB provides the mechanism required for distributed objects to communicate with one another, whether locally or on remote devices, written in different languages, or at different locations on a network. Common Object Request Broker Architecture (CORBA) is an architecture and specification for creating, distributing, and managing distributed program objects in a network. It allows programs at different locations and developed by different vendors to communicate in a network through an "interface broker".

Try Corba Interview Questions & Answers - Exam Mode


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Corba Interview Questions & Answers - Learning Mode
Try Corba Interview Questions & Answers - Exam Mode
Question: Can Corba application be tuned for better performance?

Answer: There are a number of ways to tune CORBA applications for better performance.<br><br>Remember that distribution should only be used if a reason to do so exists. Distribution does not make sense for the sake of distribution. If distribution does not serve a purpose then it should be avoided. Avoiding excessive distribution can result in better performance. Care should be taken when introducing distribution into an applications object model.<br>IDL interfaces can be tuned to mini Source:
Question: Does Corba define high level application architectures?

Answer: No, it?s infrastructure. Which is good because the history of high-level ?one size fits all? architectures hasn?t been very good, has it?<br>CORBA provides low level request/response communication. It also provides general services that are implemented on top of request/response communication. The actual architecture used within a given application is not defined by CORBA. CORBA leaves these decisions up the application architect. Source:
Question: What is CORBA good for?

Answer: CORBA is useful in many situations. Because of the easy way that CORBA integrates machines from so many vendors, with sizes ranging from mainframes through minis and desktops to hand-helds and embedded systems, it is the middleware of choice for large (and even not-so-large) enterprises. One of its most important, as well most frequent, uses is in servers that must handle large number of clients, at high hit rates, with high reliability. CORBA works behind the scenes in the computer rooms of man Source:
Question: What is CORBA? What does it do?

Answer: CORBA is the acronym for Common Object Request Broker Architecture, OMG's open, vendor-independent architecture and infrastructure that computer applications use to work together over networks. Using the standard protocol IIOP, a CORBA-based program from any vendor, on almost any computer, operating system, programming language, and network, can interoperate with a CORBA-based program from the same or another vendor, on almost any other computer, operating system, programming language, and n Source:
Question: Can Corba application be multi-threaded?

Answer: The CORBA specification does not currently address multi-threaded architectures. Provided that the CORBA product is thread safe, threaded CORBA applications can be developed. CORBA clients and servers can both be multi-threaded. Daemon processes provided with CORBA products may be implemented as multi-threaded servers by the CORBA vendor. Different multi-threaded models or multi-threaded architectures may be supported by a particular CORBA product. A particular ORB may provide frameworks to simp Source:
Question: What is the basic Corba Architecture?

Answer: The CORBA architecture is designed to support the distribution of objects implemented in a variety of programming languages. This is achieved by defining an interface definition language that can be mapped to a number of existing languages. IDL is used to define the services offered by a particular distributed object. CORBA defines a wire protocol for making requests to an object and for the object to respond to the application making the request. The IIOP protocol ensures interoperability betwe Source:
Question: Does Corba supports asynchronous communication?

Answer: Kind of. At the lowest level CORBA supports two modes of communication:<br>A synchronous request/response which allows an application to make a request to some CORBA object and then wait for a response.<br>A deferred synchronous request/response which allows an application to make a request to some CORBA object. An empty result will be returned immediately to the application. It can then perform other operations and later poll the ORB to see if the result has been made available.< Source:
Question: What is the reason to implement Corba in client application application?

Answer: Client-side CORBA applications might require multi-threading to allow it to perform other tasks while it is waiting for a synchronous remote invocation to return. It might desire this functionality for several different reasons.<br>A client application might wish to leverage the static request/response style of invocation but achieve some degree of asynchronous communication. Perhaps the client wishes to perform several synchronous invocations within their own application threads. This wou Source:
Question: What are the reason to avoid the development of multi-threaded Corba application?

Answer: Building multi-threaded applications requires an additional efforts in the area of design, development and testing. Issues like concurrency and synchronization become more critical. Difficult to find software bugs are unfortunately easy to introduce. A specific set of application requirements can often be met without resorting to the use of threaded clients or servers. This is not true with all applications. Some do require multi-threading to achieve their desired level of concurrency, performan Source:
Question: How does Corba support interoperability?

Answer: CORBA?s goal is to address interoperability at various levels. There is a history to this.<br>In the early versions of CORBA, interoperability between platforms and programming languages was addressed. This included the standardization of IDL and the mapping of IDL to a programming language. While a client and server developed with the same vendor?s ORB could talk to one another, a client and server developed with different vendors? ORBs were not likely to interoperate.<br>CORBA 2.0 Source:
Question: What is the reason to implement a corba application with multi-threading?

Answer: CORBA server applications may be multi-threaded for serveral reasons.<br>A particular CORBA object may support an operation whose implementation performs some blocking routine. This may be a disk read or database query. Let us assume that the server application processes all CORBA events within a single main thread. This means that the server will be unable to respond to incoming connection requests or invocation requests while the blocking operation is in progress. Multi-threading can be Source:
Question: Can Corba allow servers to cause client side events or notifications?

Answer: CORBA communication is inherently asymmetric. Request messages originate from clients and responses originate from servers. The important thing to realize is that a CORBA server is a CORBA object and a CORBA client is a CORBA stub. A client application might use object references to request remote service, but the client application might also implement CORBA objects and be capable of servicing incoming requests. Along the same lines, a server process that implements CORBA objects might have sev Source:
Question: Do different Corba implementations perform at significantly different levels?

Answer: Different CORBA implementations can vary significantly in performance. Good implementations should be fairly similar since network performance defines the maximum achievable performance characteristics. Network latency does represent the significant portion of distributed invocation latency. Source:
Question: Can you give me high-level technical overview?

Answer: CORBA applications are composed of objects, individual units of running software that combine functionality and data, and that frequently (but not always) represent something in the real world. Typically, there are many instances of an object of a single type - for example, an e-commerce website would have many shopping cart object instances, all identical in functionality but differing in that each is assigned to a different customer, and contains data representing the merchandise that its part Source:
Question: Are there different threading models that can be used within Corba servers?

Answer: There are several different common architectures that can be used within multi-threaded CORBA servers. A server process needs the ability to process CORBA messages. These messages are processed by one or more threads, as determined by the application architecture. The CORBA specification does not specifically address threading capabilities within CORBA compliant ORBs.<br>An ORB vendor is free to support only single-threaded application or to support multi-threaded applications. If the ORB Source:
Question: Can Corba application have call back?

Answer: Yes. The words client and server are really only applicable in the context of a remote call. In other words, the ?client process? can also receive calls on CORBA objects that it implements and hands out the references to. Source:
Question: Does Corba support distributed reference counting architectures?

Answer: CORBA does not directly support distributed reference counting. This was a conscious decision on the part of its designers. While CORBA does not directly support reference counting, it is possible to build reference counting into a particular distributed object architecture. This can be done through an explicit session management facility which can be exposed through factories or other remote interfaces. While it is possible to design reference counting into an application, it is the burden of t Source:
Question: Are there important forms of asynchronous communication that are not supported directly by Corba?

Answer: Yeah, but you can fake it pretty easily.<br>While CORBA does support a deferred synchronous request/response, it does not directly support distributed requests with a callback driven response. A callback driven response allows an application to perform an operation on a distributed object, associate a callback with the response, continue with other processing. When the server responds, the associated callback is automatically executed within the original caller?s application. Source:


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