public boolean cancel()

in src/main/java/com/twitter/whiskey/futures/CompletableFuture.java [78:100]

• 19 lines of code
• 4 McCabe index (conditional complexity)

    public boolean cancel(boolean mayInterruptIfRunning) {

        if (done) return false;

        synchronized(this) {
            if (done) return false;
            cancelled = true;
            done = true;

            final Exception e = new CancellationException();
            for (final Listener<T> listener : listeners) {
                listener.getExecutor().execute(new Runnable() {
                    @Override
                    public void run() {
                        listener.onError(e);
                    }
                });
            }

            notifyAll();
            return true;
        }
    }