A Java architect, first of all, must be an advanced java siege lion, proficient in using various frameworks, and know the principles of their implementation. The principle and tuning of jvm virtual machine, knowing jvm can make you write better performance code; pool technology, what object pool, connection pool, thread pool...
Technologies that Java architects need to master:
1. Proficiency in using various frameworks and knowing the principles of their implementation.
2. Principles and tuning of jvm virtual machine, knowing jvm allows you to write code with better performance;
3. Pool technology, what kind of object pool, connection pool, thread pool... Java reflection technology, the necessary technology for writing frameworks, when encountering serious performance problems, alternative java bytecode technology;
4. nio, there is nothing to say, it is worth noting the characteristics of "direct memory" and usage scenarios; java multi-threaded synchronization and asynchronous; the realization principle of various collection objects in java, understanding these can let you choose the right data when solving problems Structure, efficient solution to problems, such as the implementation principle of hashmap, many people with more than five years of experience can’t figure it out, and why are there performance problems during expansion? If you don’t figure out these principles, you can’t write efficient code. I think I did it right;
In a word, the more basic things are more important. Many people think that they can use them to write code. In fact, they only know how to call the API, which is far from being able to use them.
5. Proficiency in the use of various data structures and algorithms, arrays, hashes, linked lists, sort trees... In a word, it is either time for space or space for time. It can be said that there are a lot of developments here, and some application experience is required. Used to solve various performance or business problems.
6. Familiar with Linux operating system, essential, nothing to say.
7. Familiar with the tcp protocol, creating the whole process of three-way handshake for connection and four-way handshake for disconnection. If you don’t understand, you can’t optimize high-concurrency network applications. Familiar with the http protocol, especially the http header, I found a lot of work for more than five years They are confused about the life cycle of session and cookie and the relationship between them.
7. System clustering, load balancing, reverse proxy, dynamic and static separation, static website. Distributed storage systems nfs, fastdfs, tfs, Hadoop understand their advantages and disadvantages and applicable scenarios. Distributed caching technology memcached and redis are necessary to improve system performance. In a word, put the content on the hard disk into the memory to speed up, and by the way, mention an algorithm consistency hash.
8. The necessary skills of the tool nginx are super easy to use, high-performance, basically a server that will not hang up, and many functions to solve various problems.
9. Database design capabilities, mysql essential, basic database tools, free and easy to use, optimization of its basic parameters, slow query log analysis, master-slave replication configuration, at least half a mysql dba. Other nosql databases such as mongodb.
10. There are also queue middleware. Such as message push, you can write the message to the database first, push it to the queue server, and then the push server will go to the queue for processing, so that the message can be put in the database and queue and feedback directly to the user. The push process is performed by the push server and queue. Server completion, benefit from asynchronous processing, relieve server pressure, and decoupling system.
The above are purely commonly used techniques, and there are a lot of them to explore slowly; because there are many things to know, so to become a qualified architect, you must have a strong self-learning ability, no one will teach you hand in hand everything.
If you want to become an architect, you don’t need to understand a lot of technologies. These are the basis and tools for solving problems. How to propose solutions if you don’t understand these? This is a necessary condition for becoming an architect.
Architects must put forward design solutions that can solve problems and low cost according to business characteristics and system performance requirements to be qualified. A system with hundreds of users will have a small amount of visits and a small amount of data. You can cluster and upload to others. Distributed storage, high-end servers, and architecture for the sake of architecture are very nonsense. The role of an architect is to meet business needs and use low hardware network costs and technical maintenance costs.
Architects should also foresee in advance the solution to the next stage of system architecture according to the business development stage, and consider the upgrade and expansion of the architecture when designing the current architecture, so that it is easy to upgrade; otherwise, the system bottleneck will come and problems will occur. Going to the solution, or the existing architecture cannot be extended, throw away and redo, or expand a lot of troublesome problems, which will cause losses to the enterprise.
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1. Popular framework source code
Two, distributed
Three, microservice architecture
Fourth, performance optimization
Five, multi-threaded concurrent programming
Six, engineering
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