melody

Sometimes we need to measure how long does a java process or a specific method take. We can use some traditional method like below to do that but it wont be too elegant

private void someMethod() {
	Long timestamp = System.currentTimeMillis();
	// do some process
	logger.info(System.currentTimeMillis()-timestamp)
}

It looks good but we are unable to generate a report or statistics for this. And this is where Java Melody’s Stopwatch comes into the picture. It can measure the time needed for a specific process and generate report and statistics for it.

This is how it works,

public class RestService {
    public void callRestAPIOne() {
        try (Stopwatch stopwatch = new Stopwatch("stopwatch-for-one-todo")) {
            try {
                HttpRequest request = HttpRequest.newBuilder().uri(new URI("https://jsonplaceholder.typicode.com/todos/1"))
                        .GET().build();
                System.out.println(HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString()).body());
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    public void callRestAPITwo() {
        try (Stopwatch stopwatch = new Stopwatch("stopwatch-for-users")) {
            try {
                HttpRequest request = HttpRequest.newBuilder().uri(new URI("https://jsonplaceholder.typicode.com/users"))
                        .GET().build();
                System.out.println(HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString()).body());
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    public void callRestAPIThree() {
        try (Stopwatch stopwatch = new Stopwatch("stopwatch-for-posts")) {
            try {
                HttpRequest request = HttpRequest.newBuilder().uri(new URI("https://jsonplaceholder.typicode.com/posts"))
                        .GET().build();
                System.out.println(HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString()).body());
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }
}

And it shall generate report like this,