Friday, November 23, AMONG the numerous advantages promised by a wellconstructed Union, none deserves to be more accurately developed than its tendency to break and control the violence of faction. The friend of popular governments never finds himself so much alarmed for their character and fate, as when he contemplates their propensity to this dangerous vice. He will not fail, therefore, to set a due value on any plan which, without violating the principles to which he is attached, provides a proper cure for it.
Concluding Thoughts One of the entertaining things about the enterprise Java world is the huge amount of activity in building alternatives to the mainstream J2EE technologies, much of it happening in open source. A lot of this is a reaction to the heavyweight complexity in the mainstream J2EE world, but much of it is also exploring alternatives and coming up with creative ideas.
A common issue to deal with is how to wire The avalon project essay different elements: A number of frameworks have taken a stab at this problem, and several are branching out to provide a general capability to assemble components from different layers.
These are often referred to as lightweight containers, examples include PicoContainerand Spring. Underlying these containers are a number of interesting design principles, things that go beyond both these specific containers and indeed the Java platform.
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Here I want to start exploring some of these principles. The examples I use are in Java, but like most of my writing the principles are equally applicable to other OO environments, particularly. Components and Services The topic of wiring elements together drags me almost immediately into the knotty terminology problems that surround the terms service and component.
You find long and contradictory articles on the definition of these things with ease. For my purposes here are my current uses of these overloaded terms. I use component to mean a glob of software that's intended to be used, without change, by an application that is out of the control of the writers of the component.
By 'without change' I mean that the using application doesn't change the source code of the components, although they may alter the component's behavior by extending it in ways allowed by the component writers. A service is similar to a component in that it's used by foreign applications.
The main difference is that I expect a component to be used locally think jar file, assembly, dll, or a source import. A service will be used remotely through some remote interface, either synchronous or asynchronous eg web service, messaging system, RPC, or socket. I mostly use service in this article, but much of the same logic can be applied to local components too.
Indeed often you need some kind of local component framework to easily access a remote service. But writing "component or service" is tiring to read and write, and services are much more fashionable at the moment. A Naive Example To help make all of this more concrete I'll use a running example to talk about all of this.
Like all of my examples it's one of those super-simple examples; small enough to be unreal, but hopefully enough for you to visualize what's going on without falling into the bog of a real example. In this example I'm writing a component that provides a list of movies directed by a particular director.
This stunningly useful function is implemented by a single method. Then it just hunts through this list to return those directed by a particular director. This particular piece of naivety I'm not going to fix, since it's just the scaffolding for the real point of this article.
The real point of this article is this finder object, or particularly how we connect the lister object with a particular finder object. The reason why this is interesting is that I want my wonderful moviesDirectedBy method to be completely independent of how all the movies are being stored.
So all the method does is refer to a finder, and all that finder does is know how to respond to the findAll method. I can bring this out by defining an interface for the finder.
In this case I put the code for this in the constructor of my lister class. I'll spare you the details, after all the point is just that there's some implementation. Now if I'm using this class for just myself, this is all fine and dandy.
But what happens when my friends are overwhelmed by a desire for this wonderful functionality and would like a copy of my program?We would like to show you a description here but the site won’t allow us.
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English Essay Destroying Avalon In the novel Destroying Avalon by Kate McCaffrey I was able to interpret the text easily in various ways due to my personal experiences and context.
The Responsibility Project: Avalon This paper is on short film.