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/*
 *  Copyright 2017 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 com.netflix.metacat.common.server.util;

import com.netflix.spectator.api.Registry;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * Utility functions for Registry.
 * @author amajumdar
 */
public final class RegistryUtil {
    private static final String NAME_MONITORED_POOL = "MonitoredThreadPool_";

    private RegistryUtil() { }

    /**

     * Register the pool properties.
     * @param registry Spectator registry
     * @param name name of the monitor
     * @param pool thread pool
     */
    public static void registerThreadPool(final Registry registry,
        final String name,
        final ThreadPoolExecutor pool) {
        registry.gauge(NAME_MONITORED_POOL + name + "_" + "activeCount", pool, ThreadPoolExecutor::getActiveCount);
        registry.gauge(NAME_MONITORED_POOL + name + "_" + "completedTaskCount", pool,
            ThreadPoolExecutor::getCompletedTaskCount);
        registry.gauge(NAME_MONITORED_POOL + name + "_" + "corePoolSize", pool, ThreadPoolExecutor::getCorePoolSize);
        registry
            .gauge(NAME_MONITORED_POOL + name + "_" + "maximumPoolSize", pool, ThreadPoolExecutor::getMaximumPoolSize);
        registry.gauge(NAME_MONITORED_POOL + name + "_" + "poolSize", pool, ThreadPoolExecutor::getPoolSize);
        registry.collectionSize(NAME_MONITORED_POOL + name + "_" + "queueSize", pool.getQueue());
        registry.gauge(NAME_MONITORED_POOL + name + "_" + "taskCount", pool, ThreadPoolExecutor::getTaskCount);
    }
}