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1141 Coupling RPC is designed to work on object or function interfaces, resulting in the model producing tightly coupled systems as any changes to the interfaces will need to be propagated through the codebase of both systems This makes RPC a very invasive mechanism of distribution As the number of changes to source or target systems increase, the cost will increase too RPC provides an in exible method of integrating multiple systems 1142 Reliability Reliable communications can be the most important concern for distributed applications Any failure outside of the application code, network, hardware, service, other software or service outages of various kinds (network provider, power, etc) can affect the reliable transport of data between systems Most RPC implementations provide little or no guaranteed reliable communication capability; they are very vulnerable to service outages 114.

3 Scalability In a distributed system constructed with RPC, the blocking nature of RPC can adversely affect performance in systems where the participating subsystems do not scale equally This effectively slows the whole system down to the maximum speed of its slowest participant In such conditions, synchronous-based communication techniques such as RPC may have trouble coping when elements of the system are subjected to a high-volume burst in traf c Synchronous RPC interactions use more bandwidth because several calls must be made across the network in order to support a synchronous function call The implication of this supports the use of the asynchronous model as a scalable method of interaction 1144 Availability Systems built using the RPC model are interdependent, requiring the simultaneous availability of all subsystems; a failure in a subsystem could cause the entire system to fail.

Taking a cue from the preceding discussions on the format and contents of the welcome page, the code for the application will be as follows:

In an RPC deployment, the unavailability of a subsystem, even temporally, due to service outage or system upgrading can cause errors to ripple throughout the entire system 115 Introduction to Message-Oriented Middleware (MOM) MOM systems provide distributed communication on the basis of the asynchronous interaction model; this nonblocking model allows MOM to solve many of the limitations found in RPC Participants in a MOM-based system are not required to block and wait on a message send, they are allowed to continue processing once a message has been sent This allows the delivery of messages when the sender or receiver is not active or available to respond at the time of execution MOM supports message delivery for messages that may take minutes to deliver, as opposed to mechanisms such as RPC (ie, Java RMI) that deliver in milliseconds or seconds.

When using MOM, a sending application has no guarantee that its message.

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N OT E You can download JSP environments from the following site: http:// java.sun.com/products/jsp/download.html. Alternately, the software can also be installed by using a CD.

Getting started The first major design decision you make when building an LDAP structure concerns how you are going organize information. You have this tree thing that describes all your data and yet you have to store all sorts of different items contact information, product information, and even orders. Working from this information, you have to decide how to organize the data structures of the tree. Just as with object oriented programming, there is no absolute right way to do things. A number of common approaches are used for structures, but you don't need to stick with them. It is all a matter of whatever feels right for your project. Two common arrangements for directory information trees in LDAP are illustrated in Figures 8 2 and 8 3. The first shows a company style structure that holds information relative to the functional requirements geographic office locations and then functional items such as printers, staff, and so on.

the cues. Clinically it has been observed that it is best to work with the patients and help them determine what they will use for their external cues, in addition to when and how they will use them.

The origin of Web development is the result of man s continuous endeavor to gratify the basic need for communication. Both man and animals subsist as social beings and depend heavily on communication as a means of expression. Animals have their own system of social communication, which is specific to their individual species. Man, on the other hand, has used the postal services and inventions such as telephones to facilitate communication across geographical borders. Communication through postal services, though, was slow. Telephones, on the other hand, did enable communication but were expensive because of the sizable geographical