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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.alibaba.nacos.client.naming.beat;

import com.alibaba.nacos.api.common.Constants;
import com.alibaba.nacos.client.monitor.MetricsMonitor;
import com.alibaba.nacos.client.naming.net.NamingProxy;
import com.alibaba.nacos.client.naming.utils.UtilAndComs;

import java.util.Map;
import java.util.concurrent.*;

import static com.alibaba.nacos.client.utils.LogUtils.NAMING_LOGGER;

/**
 * @author harold
 */
public class BeatReactor {

    private ScheduledExecutorService executorService;

    private NamingProxy serverProxy;

    public final Map dom2Beat = new ConcurrentHashMap();

    public BeatReactor(NamingProxy serverProxy) {
        this(serverProxy, UtilAndComs.DEFAULT_CLIENT_BEAT_THREAD_COUNT);
    }

    public BeatReactor(NamingProxy serverProxy, int threadCount) {
        this.serverProxy = serverProxy;

        executorService = new ScheduledThreadPoolExecutor(threadCount, new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                Thread thread = new Thread(r);
                thread.setDaemon(true);
                thread.setName("com.alibaba.nacos.naming.beat.sender");
                return thread;
            }
        });
    }

    public void addBeatInfo(String serviceName, BeatInfo beatInfo) {
        NAMING_LOGGER.info("[BEAT] adding beat: {} to beat map.", beatInfo);
        String key = buildKey(serviceName, beatInfo.getIp(), beatInfo.getPort());
        BeatInfo existBeat = null;
        //fix #1733
        if ((existBeat = dom2Beat.remove(key)) != null) {
            existBeat.setStopped(true);
        }
        dom2Beat.put(key, beatInfo);
        executorService.schedule(new BeatTask(beatInfo), beatInfo.getPeriod(), TimeUnit.MILLISECONDS);
        MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size());
    }

    public void removeBeatInfo(String serviceName, String ip, int port) {
        NAMING_LOGGER.info("[BEAT] removing beat: {}:{}:{} from beat map.", serviceName, ip, port);
        BeatInfo beatInfo = dom2Beat.remove(buildKey(serviceName, ip, port));
        if (beatInfo == null) {
            return;
        }
        beatInfo.setStopped(true);
        MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size());
    }

    private String buildKey(String serviceName, String ip, int port) {
        return serviceName + Constants.NAMING_INSTANCE_ID_SPLITTER
            + ip + Constants.NAMING_INSTANCE_ID_SPLITTER + port;
    }

    class BeatTask implements Runnable {

        BeatInfo beatInfo;

        public BeatTask(BeatInfo beatInfo) {
            this.beatInfo = beatInfo;
        }

        @Override
        public void run() {
            if (beatInfo.isStopped()) {
                return;
            }
            long result = serverProxy.sendBeat(beatInfo);
            long nextTime = result > 0 ? result : beatInfo.getPeriod();
            executorService.schedule(new BeatTask(beatInfo), nextTime, TimeUnit.MILLISECONDS);
        }
    }
}