How use millis() in static methods?

kucky

Hello, I want to calculate the time within the Serialevent Methode.

static class SerialPortReader implements SerialPortEventListener {

    public void serialEvent(SerialPortEvent event) {
        startLoop = millis(); 
        ...
        ...
        long endLoop = millis();                    
        println("Looptime = "+(endLoop - startLoop));

    }// End of serialEvent  
}// End of SerialPortReader 

I'm not static friendly :)) ;)

koogs

why are you using static classes?

if you're only using it for timing, like above, then use new Date().getTime();

otherwise, millis() is actually a method belonging to PApplet so you can pass that into your class and store it

import java.util.Date;

void setup() {
  A a = new A(this);
}

static class A {
  PApplet p;
  public A(PApplet p) {
    this.p = p;
  }
  public void usingPApplet() {
    long start = p.millis(); // milliseconds since start of program
    long end = p.millis(); // milliseconds since start of program
    long timeTaken = end - start;
  }
  public void usingDate() {
    long start = new Date().getTime(); // milliseconds since 1970
    long end = new Date().getTime(); // milliseconds since 1970
    long timeTaken = end - start;
  }
}

// non-static class can access methods from PApplet directly
class B {
  public void usingMillis() {
    long start = millis(); // milliseconds since start of program
    long end = millis(); // milliseconds since start of program
    long timeTaken = end - start;
  }
}

kucky

Thanks for the very quick response. ^:)^

My serial communication is not fast enough. I want display the time within the Serialevent loop.

I will try it.

koogs

actually, don't bother with Date, there are easier ways:

System.currentTimeMillis()

will give you the same information without having to create the date object.

http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/System.html#currentTimeMillis()

System.nanoTime()

does the same thing with nanoseconds (but probably won't give you nanoseconds because your system won't report them. also, time might go backwards using this)

http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/System.html#nanoTime()

kucky

I have tried it successfully.

But i use static class no more. "why are you using static classes?" Thanks for your hint.

The event loop time is OK. msec 1-4. But the problem isn't solved. The graphic is relatively slow.