Download Learning Python design patterns : a practical and fast-paced by Gennadiy Zlobin PDF

By Gennadiy Zlobin

Layout development is a widely known method of clear up a few particular difficulties which every software program developer comes throughout in the course of his paintings. layout styles catch higher-level constructs that in general seem in courses. in the event you know the way to enforce the layout trend in a single language, ordinarily it is possible for you to to port and use it in one other object-oriented programming language.

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You defer the object initialization until you really need it. But it is not the only one use-case of a proxy. Proxies help to implement logging, facilitate network connections, control access to shared objects, implement reference counting, and have many other uses. Facilitating Object Communication with Proxy and Observer Patterns Proxy design pattern A proxy is a class, functioning as an interface to another class that has the same interface as the proxy. The client code instantiates and works directly with the proxy, whereas, the proxy contains the real-object instance and delegates all calls to it, adding the proxy's own logic.

In the example shown in the chapter, we used the Singleton class for accessing a shared resource and a set of URLs to fetch images from, and both threads used it to properly parallelize their work. In the next chapter, you will learn about other patterns for creating objects, including: factory, the factory method, the abstract factory, and how they help to build objects. [ 26 ] Building Factories to Create Objects In object-oriented development terminology, a factory is a class for creating other objects.

Typically, you open your favorite FTP client, type a URL to connect to, and you can see the directory listing on the server. Choose a file to download. Some web servers, along with FTP, have HTTP frontend to the same resources. This means that you can open the same web resource with a browser and see the same directory listing as you could see if you opened it with an FTP client. org that can be accessed with http://ftp. org (FTP protocol). In our application example, we want to be able to get a file list on such servers with FTP and HTTP using the Factory Method pattern.

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