Apologies for being ignorant here.
A simple Node.js non-blocking implementation (stupid but just to show the
point):
var http = require("http");
http.createServer(function (request, response) {
//Query 1st Database based on user Id
db1.query("select x,y from DB1 where userId=" + request.currentUser.id,
function (result1) {
//Query 2nd Database on response from 1st Database
db2.query("select a,b from DB2 where id =" + result1.taskid + " and
location=" + request.currentUser.locId, function (result2) {
response.writeHead(200, { "Content-Type": "text/html" });
//Write Reponse
response.write("<p>Got result for </p>" +
request.currentUser.Name + "Data: " + result2.amount);
response.end();
});
});
}).listen(9090);
What above program does is:
- 1. Query 1st Database for requested User
- 2. Query 2nd Database based on result from previous query
- 3. Stiches together a response
If the Node.js is Single Thread based, then I hope this is something
happens:
1. >Gets the request from 1st user
a. Fires non-blocking Database Access for that userId
2. >Serves next request from 2nd user
a. Fires non- blocking Database Access for that userId
…………..
…………..
3. >Gets Event from the non-blocking Database Access for 1st user
a. Fires the second non-blocking Database Access for 1st user.
I have two questions here:
1. 1)*How is the state is being maintained here?*
a. If this is single threaded model, then the with the second request
coming, it wouldn’t have idea of the initial request or state
i. If
it actually dumps the information to memory and then works on, and once it
receives event , loads state from memory
I. Then how it is different from multi-threading, which forking
and joining.
1. 2)*Who is running the non –blocking items?*
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