com.github.benmanes.caffeine.jcache.JCacheProfiler.java Source code

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/*
 * Copyright 2015 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.github.benmanes.caffeine.jcache;

import static java.util.Objects.requireNonNull;

import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;

import javax.cache.Cache;
import javax.cache.CacheManager;
import javax.cache.Caching;
import javax.cache.configuration.MutableConfiguration;
import javax.cache.spi.CachingProvider;

import com.github.benmanes.caffeine.jcache.spi.CaffeineCachingProvider;
import com.google.common.base.Stopwatch;

/**
 * A hook for profiling the JCache adapter.
 *
 * @author Ben Manes (ben.manes@gmail.com)
 */
public final class JCacheProfiler {
    private static final int THREADS = 10;
    private static final int KEYS = 10_000;
    private static final boolean READ = true;

    private final Cache<Integer, Boolean> cache;
    private final LongAdder count;
    private final Random random;

    JCacheProfiler() {
        random = new Random();
        count = new LongAdder();
        CachingProvider provider = Caching.getCachingProvider(CaffeineCachingProvider.class.getName());
        CacheManager cacheManager = provider.getCacheManager(provider.getDefaultURI(),
                provider.getDefaultClassLoader());
        cache = cacheManager.createCache("profiler", new MutableConfiguration<>());
    }

    public void start() {
        for (Integer i = 0; i < KEYS; i++) {
            cache.put(i, Boolean.TRUE);
        }
        Runnable task = () -> {
            for (int i = random.nextInt();; i++) {
                Integer key = Math.abs(i % KEYS);
                if (READ) {
                    requireNonNull(cache.get(key));
                } else {
                    cache.put(key, Boolean.TRUE);
                }
                count.increment();
            }
        };

        scheduleStatusTask();
        for (int i = 0; i < THREADS; i++) {
            ForkJoinPool.commonPool().execute(task);
        }
    }

    private void scheduleStatusTask() {
        Stopwatch stopwatch = Stopwatch.createStarted();
        Executors.newSingleThreadScheduledExecutor().scheduleWithFixedDelay(() -> {
            long count = this.count.longValue();
            long rate = count / stopwatch.elapsed(TimeUnit.SECONDS);
            System.out.printf("%s - %,d [%,d / sec]%n", stopwatch, count, rate);
        }, 5, 5, TimeUnit.SECONDS);
    }

    public static void main(String[] args) {
        new JCacheProfiler().start();
    }
}