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Tuesday, August 7, 2007

java Architecture tutorial

6 Sun recommendation: Java IDL should be used when accessing existing CORBA servers is the main purpose, whereas RMI-IIOP should be used when serving requests from CORBA clients is the main purpose. Development Process: Write interface in IDL, compile to Java (results in interface and several classes). Use interface in client programming. Descend server from generated ImplBase class (aka ‘implementation skeleton’). IDL-to-Java also generates ‘Stub’ class (client proxy), ‘Holder’ class (for out or inout parameters) and ‘Helper’ class (for narrowing and reading/writing). ORB interface (org.omg.CORBA.ORB) and implementations (e.g. com.sun.CORBA.iiop.ORB). Getting an ORB: static ORB.init. NamingContext in package org.omb.CosNaming. Object references: Temporary references (through proxy) and long-lived ‘stringified’ interoperable object references (IOR). JNI Java Native Interface (JNI) is a standard for linking Java to native programs written in other languages like C and C++. A good way to integrate a legacy application that is not written in Java into a distributed
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7

Design Patterns 1) State the benefits of using design patterns. Improves communication between designers by use of pattern names vs. the details of the patterns. Captures experience of solving a type of problem. Provide a way of reusing design. Provide a mechanism for making designs more reusable. Provides a mechanism for systematizing the reuse of things that have been seen before. Can be used to teach good design. 2) From a list, select the most appropriate design pattern for a given scenario. 3) State the name of a GOF design pattern given the UML diagram and/or a brief description of the pattern’s functionality. 4) Select from a list benefits of a specified GOF pattern. Identify the GOF pattern associated with a specified J2EE feature. Types of patterns Creational: Involved with the process of object creation. Structural: Deals with the composition of classes or objects. Behavioral: Characterize the ways in which classes or objects interact and distribute responsibility. Abstract Factory: (Creational) Provide an interface for creating families of related or dependent objects (products) without specifying
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EJB objects.

It isolates concrete classes. It makes exchanging product families easy. It promotes consistency among products. Supporting new kinds of products is difficult. Factory Method: (Creational) Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. J2EE technology uses this pattern for the EJB Home interface, which creates new EJB objects. Eliminates the need to bind application-specific classes into your code. Gives subclasses a hook for providing an extended version of an object being constructed. Prototype: (Creational) Specify the kinds of objects to create using a prototypical instance create new objects by copying this prototype Hides the concrete product classes from the client Allows adding and removing products at run-time Can specify new object by varying the values of an object’s variables. Singleton: (Creational) Ensure a class only has one instance, and provide a global point of access to it. Provides controlled access to a sole instance of a class.
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Permits a variable number of instances.

More flexible than static methods. Adapter: (Structural) Convert the interface of a class into another interface clients expect.


8 Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces. Permits you to use an existing class that has an interface that does not match the one you need. You want to create a reusable class that cooperates with unrelated or unforeseen classes. The Object Adapter pattern can be used when you need to use several existing subclasses but it is impractical to adapt their interface by subclassing every one. Bridge: (Structural) Decouple an abstraction from its implementation so that the two can vary independently. Use when you want to avoid a permanent binding between an abstraction and its implementation. Use when both the abstractions and the implementations should be extensible by subclassing. Changes in the implementation should not impact clients. Composite: (Structural) Compose objects into tree structures to represent whole-part hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.
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Allows clients to treat composite structures and individual objects uniformly.

Makes it easier to add new kinds of components. A disadvantage is that it can make a design overly general. Flyweight: (Structural) Use sharing to support large numbers of fine-grained objects efficiently. Decorator: (Structural) Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality. In J2EE technology, The EJB object is a decorator for the bean because the bean’s functionality is expanded to include remote behavior. Proxy: (Structural) Provide a surrogate or placeholder for another object to control access to it. The EJB’s remote interface acts as a proxy for the bean. Proxy is also used in RMI. Façade: (Structural) Provide a unified interface to a set of interfaces in a subsystem. Façade defines a higher-level interface that makes the subsystem easier to use. Can use to achieve runtime binding without using inheritance. The Session Entity Façade pattern is a derivation of Façade that uses a Session bean as a façade for multiple Entity beans. Command: (Behavioral) Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations. The Command pattern can be used to provide pluggable

262 comments:

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モテる度チェッカー said...

夏休み目前になり、一人で大事な休みを過ごすのは誰でもイヤと違う?そんな時にモテる度チェッカーで簡単診断、この夏アナタも彼氏・彼女と過ごすための貴重なアドバイスが手に入りますよ、もうアドバイスに対しての感謝のメールが毎日!!アナタもこの夏を乗り遅れるな

グリー said...

グリー発信!!出会い専門SNS誕生、今話題のgreeから出会いをGETしよう。greeにしかできない事が盛りだくさん!!気軽にメールするだけで出会えるサイト・・・貴方の理想の異性と出会いませんか

モバゲー said...

モバゲー専門の出会い掲示板が誕生!出会いを求めている方にはオススメのサイトです。幸せな時間を過ごしたい方、淋しい思いをしたくない方はぜひご覧ください

モバゲー said...

モバゲー出会い掲示板は色々な種類の出会いを扱っております。登録無料で新しい恋の始まる事は確実です

ツイッター said...

今話題沸騰中!?新感覚出会いをツイッターで体験しませんか?リアルタイムで相手が何をしてるか分かるから、理想の人かどうかが簡単に分かる。貴方の理想の人をGETしませんか

mコミュ said...

素敵な出 会 いで愛を育む♪理想の人と楽しめる関係を築きませんか?mコミュでしか味わえない幸せを掴みましょう

スタービーチ said...

スタービーチで会える!?理想の異性をGETしよう☆素敵な出会いばかりだから求めている関係も作りやすい!!貴方が求めているのはどういった恋ですか?

名言チェッカー said...

他の人が言ってる名言や格言って良い事言ってるな~とか思ってる方、名言チェッカーで今日から自分に相応しい言葉を見つけませんか!!これでどんな人にも一目置かれる存在に為れますよ

mixi said...

mixiをも凌駕する出会い率!!出会いをするならここしかない♪mixiより出会えてしまうこのサイト。一度ハマれば辞めれません。スタービーチで素敵な出会いをしちゃいましょう

モバゲー said...

モバゲーで出会いをすれば楽しい事は間違いありません。暑いからこそ出会いを楽しむべきなのです。登録無料で簡単に利用可能!

モバゲータウン said...

モバゲータウンでは恋愛から出合いまでのキッカケをつかめる無料のコミュニティサイトです。常時サポートスタッフが掲示板をチェック、サクラや業者を排除しておりますので安心してご利用いただけます

スタビ said...

スタビが今一番アツイのはご存じでしょうか?夏休みで出会いを探している娘とすぐに会えちゃうんです。登録無料でここまで出会える所は他には存在しません。今登録して良いパートナーに巡り合おう

スタービーチ said...

出会いのシーズン、夏到来!スタービーチでご近所さんと知り合っちゃおう!ひと夏の体験も女の子は求めている

モバゲー said...

モバゲーでついに出会いができる!?楽しめる出会い、求めていた出会いはココから始まる。素敵な出会いでまずは関係づくりwしていきましょう

gree said...

greeで素敵な時間を過ごしたい・・・そんな願望を叶えてくれるサイト誕生!!今までにないドキドキ感と興奮をこのグリーで楽しみましょう

スタビ said...

スタビで出会いができる!!いつでもどこでも出会いが可能なスタービーチで最高の出会いをしてみませんか

mコミュ said...

簡単な出逢いはココでできる☆素敵な出逢いをmコミュで体験していきませんか?楽しめる出逢いを経験するならここしかない!!まずはお試しを

ツイッター said...

新時代突入!ツイッターで始まる出逢い…ここでしかできない出逢いが新しい風を巻き起こす!!素敵な巡りあわせを体験していこう!

SMチェッカー said...

あなたの秘められたSM度がわかるSMチェッカー!簡単な質問に答えるだけで自分の隠された部分が分かります!みんなで試してみよう

モバゲー said...

今やモバゲーは押しも押されもせぬ人気SNS!当然出 会いを求めてる人も多い!そこで男女が出 逢えるコミュニティーが誕生!ここなら友達、恋人が簡単にできちゃいますよ

モバゲー said...

もう夏休みも終わりに近づき、この夏最後の思い出を作りたいと焦ってる方が、モバゲーのコミュニティーに書かれてましたよ!!折角なんで夏の思い出作りに協力して自分も美味しい思いをしてみるのはどうですか?大手スポンサーサイトが付いてるので全部タダですよ

グリー said...

最近はどこのSNSサイトも規制ばっかりで、ちょっと出 合いに関して書き込みするとアク禁食らうけど、夏休み終盤に差し掛かり色々なサイトを調べた結果、グリーだけはどうも規制が緩んでるみたいです。今がチャンスの時期ですよ

ツイッター said...

ツイッターで出 合 いを求めるのです。気の合う異性と交流して楽しいひと時をお過ごしください。登録無料で使えるので気軽さは100点満点!

モテる度チェッカー said...

夏休みももう終わりに近づきこのまま一人は寂しいのちがう?そこでモテる度チェッカーを使い自分がなぜモテないか診断してもらいましょう。10~20代の女性アドバイザーが多数在籍してるので、アドバイスを参考に夏終盤を楽しもう

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Thanks for sharing this link, but unfortunately it seems to be down... Does anybody have a mirror or another source? Please reply to my post if you do!

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