com.googlecode.concurrentlinkedhashmap.Profile.java Source code

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Here is the source code for com.googlecode.concurrentlinkedhashmap.Profile.java

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/*
 * Copyright 2013 Ben Manes. All Rights Reserved.
 *
 * 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 com.googlecode.concurrentlinkedhashmap;

import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import com.google.common.base.Stopwatch;
import com.googlecode.concurrentlinkedhashmap.caches.CacheFactory;
import com.twitter.jsr166e.LongAdder;

/**
 * A simple bootstrap for inspecting with an attached profiler.
 *
 * @author Ben Manes (ben.manes@gmail.com)
 */
public final class Profile {
    static final int WARM_UP_SEC = 5;
    static final int DISPLAY_DELAY_SEC = 5;

    static final int NUM_THREADS = 25;
    static final int MAX_SIZE = 2 * NUM_THREADS;
    static final CacheType type = CacheType.ConcurrentLinkedHashMap;

    volatile LongAdder calls;
    final ConcurrentMap<Long, Long> map;

    Profile() {
        calls = new LongAdder();
        map = new CacheFactory().concurrencyLevel(NUM_THREADS).initialCapacity(MAX_SIZE).maximumCapacity(MAX_SIZE)
                .makeCache(type);
    }

    void run() throws InterruptedException {
        ConcurrentTestHarness.timeTasks(NUM_THREADS, new Runnable() {
            @Override
            public void run() {
                Long id = Thread.currentThread().getId();
                map.put(id, id);
                for (;;) {
                    map.get(id);
                    calls.increment();
                }
            }
        });
    }

    void scheduleStatusTask() {
        Executors.newSingleThreadScheduledExecutor().scheduleWithFixedDelay(new Runnable() {
            final Stopwatch stopwatch = new Stopwatch();

            @Override
            public void run() {
                if (!stopwatch.isRunning()) {
                    System.out.println("Warmup complete");
                    calls = new LongAdder();
                    stopwatch.start();
                    return;
                }
                long count = calls.longValue();
                long rate = count / stopwatch.elapsed(TimeUnit.SECONDS);
                System.out.printf("%s - %,d [%,d / sec]\n", stopwatch, count, rate);
            }
        }, WARM_UP_SEC, DISPLAY_DELAY_SEC, TimeUnit.SECONDS);
    }

    public static void main(String[] args) throws Exception {
        Profile profile = new Profile();
        profile.scheduleStatusTask();
        profile.run();
    }
}