Does redis replace session?
What is Redis
Redis is an open source log-type, Key-Value database written in ANSI C language, supports the network, can be memory-based and persistent, and provides API in multiple languages.
1. Compared with other user state saving solutions
Generally in development, user state uses session or Cookies, both methods have various pros and cons.
Session: It is easy to lose in InProc mode and cause concurrency problems. If you use SQLServer or SQLServer mode and consume performance
Cookies can easily expose some user information, and encryption and decryption also consume performance.
Redis uses this solution to solve several problems,
1. Redis has fast access speed.
2. User data is not easily lost.
3. It is easy to support clusters when there are many users.
4. Able to view online users.
5. Able to enable users to log in at one place.
6. Support persistence.
2. Implementation ideas
1. We know that session actually saves a sessionid in a cookie, and the user sends the sessionid to the server every time he visits. , the server looks up the status data corresponding to the user through the ID.
My approach here is to define a sessionid in the cookie. When the program needs to obtain the user status, the sessionid is used as the key to search in Redis.
2. At the same time, the session supports users to recycle the session if they do not access it for a certain period of time.
Borrow the expiration time feature of Keys in Redis to support this function, but in terms of renewal, the program needs to intercept the request and call this method by itself (the demo has examples)
Below Start code description
3.Redis calling interface
First reference the ServiceStack related DLL.
Add configuration in web.config. This configuration is used to set the Redis calling address for each service separated by [,]. The host is written in the first place
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Initialization configuration
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Written a delegate for the convenience of control
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An example of calling others See the source code for details
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4. Implement Session
Write a sessionid to the cookie as mentioned above
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Methods of accessing users
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6. Renewal
The default user has not been logged out for more than 30 minutes. Login status, so the user's logout time must be postponed by 30 minutes each time he visits.
This requires calling the Redis renewal method
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After encapsulation
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Here I used the ActionFilter in MVC3 to intercept all user requests
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You need to register it in Global.asax
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5. Calling method
In order to facilitate the call, borrow the new features in 4.0 Feature, add an extended attribute to Controller
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Call method
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