Web Services Coursework Example | Topics and Well Written Essays - 750 words

Web Services - Coursework Example Every operation in the TIDL interface contains additional parameters for transmission and reception of transactional data. A commit operation is either an ‘all’ or a ‘nothing’ affair. When a string of operations in a transaction fail to completed, a rollback must restore the system back to its pre-transaction state. To ensure rollback, a typical system logs every operation that takes place within the scope of a transaction, including the commit operation. A recovery or transaction manager uses these log records to redo or undo partly completed transactions when there is an exception scenario. When a transaction includes a number of distributed resources, for instance, a database server hosted on two different networks, the commit process will involve operations spanning two different systems. Here, each system will have its own log records and system manager. RPC is one of the first technologies to be used in the area of distributed computing. For an RPC call to be made, both the client and the server need to have stubs (client-side programs) for the remote service. The stubs are generated using Interface definition language (IDL). During an RPC, the arguments that the client sends across a network undergo marshalling and un-marshalling at the client and the server side respectively. The calls are synchronous. CORBA again is a technology used for objects to communicate in a distributed computing. The similarity between CORBA and RPC ends here because of the difference in the way CORBA works. In addition to a server and client, CORBA applications consist of an ORB (Object request broker). This ORB is responsible for mapping the client and server which will perform the request initiated by the client. The ORB marshals the arguments and routes the call over a network to the target objects ORB. The ORB has many more features such as objects look