By Deepak Kakadia
This ebook is a source for community architects who needs to create ideas for rising community environments in firm info facilities. you will find info on how you can leverage SunT Open community surroundings (Sun ONE) applied sciences to create prone on call for suggestions, in addition to technical information about the networking internals. the data awarded this is in line with real community engineering adventure that incorporates community product improvement and real-world consumer reviews. the point of interest of this e-book is restricted to the layout of community architectures that aid net services-based, multi-tier architectures. in spite of the fact that, it covers every thing from the sting info heart change to the server community protocol stacks.
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Extra resources for Networking Concepts and Technology: A Designer's Resource
By taking a proactive congestion avoidance approach, the pipe is kept as full as possible without the danger of network saturation. The key is for the sender to understand the state of the network and client and to control the amount of traffic injected into the system. Flow control is accomplished by the receiver sending back a window to the sender. The size of this window, called the receive window, tells the sender how much data to send. Often, when the client is saturated, it might not be able to send back a receive window to the sender to signal it to slow down transmission.
The server application opens a socket. ) The server then binds to a transport layer port, executes listen, and waits for a client to connect. Once the client connects, the server completes the TCP three-way handshake, establishes the socket, and both server and client can communicate. 2. Server sends a message by filling a buffer, then writing to the socket. 3. The message is broken up and packets are created, sent down the streamhead (down the read side of each STREAMS module) by invoking the rput routine.
3. Servlet processes a portion of the request and requests spurring service from an Enterprise Java Bean™ (EJB) running on Application server containing an EJB container. 4. EJB retrieves data from database. Figure 2-4. Model of Presentation/Web Tier Components and Interfacing Elements The Sun ONE Application server comes with a bundled Web server container. However, reasons for deploying a separate Web tier include security, load distribution, and functional distribution. There are two availability strategies that depend on the type of operations that are executed between the client and Web server processes: 36 37 • Stateless and Idempotent If the nature of transactions is idempotent (where the order of transactions is not dependent on each other), then the availability strategy at the Web tier is trivial.