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/*
 * Copyright (c) 2016 Uber Technologies, Inc. ([email protected])
 *
 * 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.uber.hoodie.metrics;

import com.codahale.metrics.MetricRegistry;
import com.google.common.io.Closeables;
import com.uber.hoodie.config.HoodieWriteConfig;
import com.uber.hoodie.config.HoodieMetricsConfig;
import com.uber.hoodie.exception.HoodieException;
import org.apache.commons.configuration.ConfigurationException;

import java.io.Closeable;

/**
 * This is the main class of the metrics system.
 */
public class Metrics {
    private static volatile boolean initialized = false;
    private static Metrics metrics = null;
    private final MetricRegistry registry;
    private MetricsReporter reporter = null;

    private Metrics(HoodieWriteConfig metricConfig) throws ConfigurationException {
        registry = new MetricRegistry();

        reporter = MetricsReporterFactory.createReporter(metricConfig, registry);
        if (reporter == null) {
            throw new RuntimeException("Cannot initialize Reporter.");
        }
//        reporter.start();

        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                try {
                    reporter.report();
                    Closeables.close(reporter.getReporter(), true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public static Metrics getInstance() {
        assert initialized;
        return metrics;
    }

    public static synchronized void init(HoodieWriteConfig metricConfig) {
        if (initialized) {
            return;
        }
        try {
            metrics = new Metrics(metricConfig);
        } catch (ConfigurationException e) {
            throw new HoodieException(e);
        }
        initialized = true;
    }

    public MetricRegistry getRegistry() {
        return registry;
    }

    public Closeable getReporter() {
        return reporter.getReporter();
    }
}