CODEWITHSUNDEEP
javatomcat
Tum
Tum

Reputation: 3652

does java tomcat process data in a form of "first come first serve" or parallelly?

Ok, I have just realized this issue.

Let say you use Java + Tomcat to build ur web App.

The Tomcat receives 2 call from 2 clients at the same time. The 1st call (will call a series of methods & return an integer) is received by the server before the 2nd.

Call1:

String passwordProvidedByUser=action.getPasswordFromClient();
String passwordFromDB=data.getPasswordFromDB();
if (passwordFromDB.equals(passwordProvidedByUser)){
      boolean updated=data.updateInfo();
}

Call 2:

 String newPassword=action.getPasswordFromClient();
boolean changePwd=data.changePwd(newPassword);

So, if Call1 finished String passwordFromDB=data.getPasswordFromDB(); but has not run the boolean updated=data.updateInfo(); while call 2 already ran boolean changePwd=data.changePwd(newPassword);. That means call 1 boolean updated=data.updateInfo(); with old password?

My question is that will Tomcat server/Java finish all the actions of 1st call & return the result to the 1st call before it starts to process the 2nd?

Or the Tomcat server/Java just starts to process the 2nd while it is still processing the 1st (ie the server hasn't return a result to the 1st, but already started to process the 2nd)?

Upvotes: 0

Views: 99

Answers (1)

Antoniossss
Antoniossss

Reputation: 32517

Every call goes on queue from where it is picked up by workers threads for processing - yes, there is pool of threads that are responsible for processing requests so the order of request handling is rather undetermined.

Upvotes: 2

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