By Greg Barish
Offers the concise roadmap Java builders and net engineers have to construct high-performance and scalable company net purposes. choked with common approach structure guidance and balanced with succinct examples for every know-how. Softcover.
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Additional info for Building Scalable and High-Performance Java Web Applications Using J2EE Technology
All three requests want to execute the same block of code called myPopularProc(). As the figure shows, each one of these threads can execute this code at the same time (since the CPU runs one thread at a time, this is not quite true, but it's very close depending on the function). In fact, each thread is currently executing a different line of code, as the figure shows. Thus, threads do not have to wait in line to execute the same piece of code. They can be interleaved so that the execution is very nearly parallel.
The communication path now consists of client-to-server1-to-server2-to-…-serverN-to-database. This seems like a route that requires more hops, which means more latencies and more chances for error or crashes. That can't be good, can it? YES, if it's done right. Increased Modularization and Component Reusability Having multiple tiers means dividing the work and routing the parts of the problem at hand to independent modules. But what if we didn't do this? What if everything were handled in a single server-side program?
The principle of "doing it only if you need to" really applies here. Coarse granularity followed by an evolution of selected granularity modifications frequently leads to the best of both worlds. By making sure that you follow the listed points, you'll give yourself the most flexibility in coupling and decoupling your application internals. Summary In this chapter, we've talked a lot about abstract application architecture and only grounded ourselves here and there. , CORBA) as well. We started our discussion by describing the three basic parts of any application—the client, the network, and the server.
Building Scalable and High-Performance Java Web Applications Using J2EE Technology by Greg Barish