I have been doing Java development for almost three years. I still only use traditional CRUD, and my salary is stuck at 12K. I don’t know how many people are in the same situation as me. . . In March 2020, due to the epidemic, working at home, a great god of Didi D9 summarized the knowledge points of the Java full stack at home. I also met this great god by chance when I was fighting for the glory of the king, and I worked with this great god After a deep exchange, he was shocked when he knew that I was still doing traditional CRUD. He said that you have been developing for three years and are still working on CRUD. If you do not develop in the direction of an architect, you will be useless in your life.
So this great god gave me this Java full-stack knowledge point. I also started to watch it in early April. It took about two months to come out for an interview. I also successfully got a 33K+15 salary architect Offer from CRUD. Although this company is not a big first-line company, I firmly believe that after I continue to learn, I can definitely join the big factory!
Due to the length of the article, I can only show part of the content for everyone. Friends in need, click here to get the information for free !
If a method cannot complete the task in the normal way, you can exit the method through another path. In this case, an object encapsulating the error message will be thrown. At this point, this method will exit immediately without returning any value. In addition, other code that calls this method cannot continue to execute, and the exception handling mechanism will hand the code execution to the exception handler.
Spring core components
RPC, that is, Remote Procedure Call (remote procedure call), calls a service on a remote computer, just like calling a local service
kind. RPC can decouple the system very well. For example, WebService is a kind of RPC based on Http protocol.
AMQP: Advanced Message Queue, Advanced Message Queue Protocol. It is an open standard for the application layer protocol. It is designed for message-oriented middleware. Clients and message middleware based on this protocol can transmit messages without being restricted by conditions such as products and development languages.
RabbitMQ originally originated in financial systems, used to store and forward messages in distributed systems, and performed well in terms of ease of use, scalability, and high availability.
Apache Cassandra is a highly scalable, high-performance distributed NoSQL database. Cassandra is designed to handle large amounts of data on many commodity servers, providing high availability without worrying about single points of failure.
Cassandra has a distributed architecture that can handle large amounts of data. Data is placed on different machines with multiple replication factors to achieve high availability without worrying about single points of failure.
The database storage engine is the underlying software organization of the database, and the database management system (DBMS) uses the data engine to create, query, update and delete data. Different storage engines provide different storage mechanisms, indexing techniques, locking levels and other functions. Using different storage engines can also obtain specific functions. Many different database management systems now support a variety of different data engines. The main storage engines are: 1. Mylsam, 2. InnoDB, 3. Memory, 4. Archive, 5. Federated.
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