Parallel and simultaneous continuations - RIFE

Continuations can run in embedded elements and any number of them can be active at the same time.

Below is the implementation of a page with multiple counters that all run independently as continuations with while loops.

The Counter.java element:

@Elem(url="", submissions = {
    @Submission(name = "decrease"),
    @Submission(name = "increase")})
public class Counter extends Element {
    public void processElement() {
        int counter = 0;
        Template t = getHtmlTemplate("counter");
        while (true) {
            t.setValue("counter", counter);
            print(t);
            pause();
            if (hasSubmission("decrease")) counter--;
            if (hasSubmission("increase")) counter++;
        }
    }
}

The counter.html template that is used by the element above:

<div>
    <r:v name="counter"/>
     
    <form action="${v SUBMISSION:FORM:decrease/}" method="post">
        <r:v name="SUBMISSION:PARAMS:decrease"/>
        <input type="submit" value=" - " />
    </form>
     
    <form action="${v SUBMISSION:FORM:increase/}" method="post">
        <r:v name="SUBMISSION:PARAMS:increase"/>
        <input type="submit" value=" + " />
    </form>
</div>

The main template that includes three counters as embedded elements:

<body>
    <r:v name="ELEMENT:Counter:1"/>
    <br />
    <r:v name="ELEMENT:Counter:2"/>
    <br />
    <r:v name="ELEMENT:Counter:3"/>
</body>