Observer Design Pattern Example

1. Definitions of some conceptual patterns: Each pattern describes a problem that continues to occur in our environment, and then describes the core of the solution to the problem. In this way, you can use the existing solutions countless times without having to repeat the same work. What is a design pattern? A design pattern is a typical, generic solution to a problem in a particular situation. We need to properly understand and learn some design patterns, in the process of development, will always involve some framework design, module design and other things, if you can understand and transport ...

Http://www.aliyun.com/zixun/aggregation/13713.html ">hbase coprocessor is one of the great expectations that many people have for hbase-0.92. It enables off-line analysis and online applications to be well integrated, and also greatly expands the application richness of hbase and is no longer a simple K class application. The design of HBase coprocessor from hbase-2000 and HBase-...

I believe many people have been puzzled by C # delegates and events, especially in C # beginners, it will feel more difficult to learn this part, very likely to give up, and. 　　NET for delegates and events encapsulation is very good, generally not how to use custom delegates and events, so give up learning the technology has an excuse! There are a number of such articles on the web, most representative of Zhang Ziyang's C # delegates and events this article, the writing is very good, received a lot of readers praise, but I read the comments, or found some problems, because there are many readers are read over and over, each feeling is quite ...

class= "Post_content" itemprop= "Articlebody" > Gossip: People's psychology in varying degrees of change, the desire to start randomly. The psychological test proves that the following pictures are related to each person's psychological endurance, the stronger your psychological endurance, the slower the picture rotation. The United States used this as a psychological test of the suspect, he saw the picture is high-speed rotation, and most of the elderly and children see that this picture is still. Please big ...

Strong "micro-trust", social entrepreneurship in the end there is no chance? If the answer is no, many entrepreneurs will not be reconciled. From happy net to Micro Bo, from micro-bo to micro-letter, when the hot social products, the ups and downs, how many lonely there is a big chance. If the answer is yes, then the question is, where is the opportunity? Is it a vertical social field? Is it the use of new media? Or a new form? In search of this answer, NetEase tech editors have spent two months investigating the early startups and startups in the mobile social arena, interviewing more than 20 CEOs and investing ...

Remote invocation is the communication mechanism between system and process, and is the core technology of distributed system development. Remote invocation technology can form a group of computer systems into a network system, the external provision of the overall service, then this group of computer systems constitute a larger, more performance of the computer system. A general statement on the architecture design of the remote invocation service first, we need to understand the following questions: Why is a remote invocation service required in an application software service? What is the problem with the remote Invoke service that solves the software design? I have written an article on the design of distributed Web site architecture, ...

Zhang Guoqing hurried into the interview room, change the gap, he walked along the way with the Chinese Fashion Designers Association secretary General Zhangqinghui Chat, the topic involves fashion, France, design ... It all sounds as if he is the CEO of Dangdang. He was even very much in line with the fashion photographer's posture requirements, a set of films filmed, for 6 or 7 sets of clothes, he was not impatient. Privately, he would say that's his job, after all, when it's no longer the book-selling site. The latest two quarterly earnings show that apparel category transactions have exceeded the entire platform of 50%, and to sell clothing ...

Once rage plasma TV, now in the mainstream home appliances market has been difficult to find traces. At the end of last year, the "father of the plasma" said Panasonic announced that it would completely end its plasma business in March 2014. Plasma TV market is declining, the global market share has less than 6%, at present only Samsung, LG and Changhong still adhere to, Changhong is the only company with plasma panel production lines. With the plasma camp shrinking, the future of plasma technology becomes bewildering. "Daily economic news" reporter found that "stick" Sichuan Changhong invested huge sums to build the plasma panel project ...

Abstract: Once rage plasma TV, now in the mainstream home appliances market has been difficult to find traces. At the end of last year, the father of the plasma said Panasonic announced that it would complete its plasma business in March 2014. Plasma TV market is declining, the global market share once rage plasma TV, now in the mainstream home appliances market has been difficult to find traces. At the end of last year, the "father of the plasma" said Panasonic announced that it would completely end its plasma business in March 2014. Plasma TV market is declining, the global market share has less than 6%, at present only Samsung, LG and Changhong still adhere to ...

One November 19, wuzhen Internet Conference. November 20, Guangzhou Auto Show. At the invitation of Shanghai General Motors, I finally chose the Guangzhou Auto Show-which surprised some friends: we thought it was Wu Town to see you, not in Guangzhou. There are three main reasons to choose the Guangzhou Auto Show: First, I really want to buy a car recently, and secondly, and most importantly, I have a very strong interest in "car networking". For me, any thing that I was interested in once I added the Internet, I would have a great passion. The third reason is also very ...