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/*
 * Copyright 2018 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.zuul.plugins;

import com.netflix.servo.publish.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * Sample poller to poll metrics using Servo's metric publication
 * @author Mikey Cohen
 * Date: 4/18/13
 * Time: 9:20 AM
 */
public class MetricPoller {

    private static Logger LOG = LoggerFactory.getLogger(MetricPoller.class);

    final static PollScheduler scheduler = PollScheduler.getInstance();

    public static void startPoller(){
        scheduler.start();
        final int heartbeatInterval = 1200;

        final File metricsDir;
        try {
            metricsDir = File.createTempFile("zuul-servo-metrics-", "");
            metricsDir.delete();
            metricsDir.mkdir();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        LOG.debug("created metrics dir " + metricsDir.getAbsolutePath());

        MetricObserver transform = new CounterToRateMetricTransform(
                new FileMetricObserver("ZuulMetrics", metricsDir),
                heartbeatInterval, TimeUnit.SECONDS);

        PollRunnable task = new PollRunnable(
                new MonitorRegistryMetricPoller(),
                BasicMetricFilter.MATCH_ALL,
                transform);

        final int samplingInterval = 10;
        scheduler.addPoller(task, samplingInterval, TimeUnit.SECONDS);

    }

}