从数据库中提取时的Vertx阻止处理程序

Question

For my web application, I need to serve dynamic HTML pages using templates and static css and JavaScript files. Except every one of my dynamic HTML pages would need to pull from a database and block the thread on the event loop. So in this case I would have to use a blocking handler for every single one of the routes/pages. My question is, is this proper at all? And would this help for many users accessing the website at one time?

Also, if I want to use my own JDBC client, rather than one provided by Vertx, can I just use that? (Eg Use HikariCP for my project and use that independent of Vertx)

Answer 1

First of all HikariCP is just another pool provider for Vertx. So you can just use it with Vertx client.

http://vertx.io/docs/vertx-jdbc-client/java/

And if you use Vertx JDBC client, you don't need to block anything at all. What it would look like is:

router
   db (callback)
      freemaker (callback)
         puts the result back on response

See this official example:
https://github.com/vert-x3/vertx-examples/blob/3.3.0/web-examples/src/main/java/io/vertx/example/web/templating/freemarker/Server.java

Notice how engine is being used. In your case, you may wrap everything from ctx.put("name", "Vert.x Web") in a DB callback, and set context accordingly.