Util.java

/**
 * Copyright 2014 Netflix, Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package rxjava;

/**
 * Benchmark utility.
 */
public final class Util {
    private Util() { }
    public static double measure(long count, Runnable r) {
        return measure(count, false, r);
    }
    public static double measure(long count, boolean noprint, Runnable r) {
        System.gc();
        double v = 0;
        long t = System.nanoTime();
        try {
            r.run();
        } finally {
            t = System.nanoTime() - t + 1;
            v = count * 1E9 / t;
            if (!noprint) {
                System.out.printf("%,.3f ops/s%n", v);
            }
        }
        return v;
    }
    public static void measureLoop(int times, long count, Runnable r) {
        double sum = 0;
        for (int i = 0; i < times; i++) {
            System.out.printf("%d | ", i);
            sum += measure(count, true, r);
        }
        System.out.printf("Average | %,.3f ops/s%n", sum / times);
    }
}