Servlets

Let's consider how to enclose a SpeakRight application in a Java servlet. Servlets are a portable API for responding to HTTP requests. Tomcat or other types of web servers (such as TBD) support servlets.

SpeakRight provides a class, SRServletRunner, that does most of the work. Here's how to use it in the doGet method of a servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
SRServletRunner runner = new SRServletRunner(new AppFactory(), this, request, response, "GET");

if (runner.isNewSession()) {
SRRunner run = runner.createNewSRRunner(this);
IFlow flow = new App();
runner.startApp(flow);
} else {
runner.logger().log("contine in GET!!");
runner.continueApp();
}
}

First we pass the request and response objects into SRServletRunner, along with a string (used for logging) and our app factory (see Initialization). Then we check if this is a new session. If it is then we create our SpeakRight application and call startApp; otherwise we call continueApp. SRServletRunner manages passifying and re-activating the SpeakRight runtime between HTTP requests.

Logging is done using log4j.