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This article mainly explains "what is the function of Ray-Handler 's ToReadHandler". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the role of Ray-Handler 's ToReadHandler?"

There are two types of Handler in Ray (SubHandler and PartSubHandler). In use, the CoreHandler,PartSubHandler of SubHandler derives from Actor and the ToReadHandler of Actor is derived from SQLToReadHandler,SQLToReadHandler, and Ray is mainly used to write CoreHandler and ToReadHandler of Actor.

SQLToReadHandler

ToReadHandler is a composite message persistence device, which includes message router, message processor, message splitter, message aggregator, message filter, and message persistence.

The first few functions (message router, message processor, message splitter, message aggregator, message filter) are similar to CoreHandler and will not be discussed in detail.

Message persistence

ToReadHandler is mainly used to write the data of interest in the message to the database, as a message persistence is its main function. As shown in the figure above, relational database read and write operations can be carried out in places marked "IO-SQL-DB". The gray and white places are the recommended operations (the current code block needs to read the data in the database, allowing read operations on the database; if you want to do database write operations, it is recommended to write to the database in the ToReadHandler subscription target event).

CoreHandler is mainly used for message routing.

ToReadHandler is mainly used for message persistence.

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