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zuul-core
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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.stats;

import com.netflix.zuul.stats.monitoring.MonitorRegistry;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Manager to handle Error Statistics
 * @author Mikey Cohen
 * Date: 2/23/12
 * Time: 4:16 PM
 */
public class ErrorStatsManager {
    ConcurrentHashMap> routeMap =
            new ConcurrentHashMap>();
    static final ErrorStatsManager INSTANCE = new ErrorStatsManager();

    /**
     *
     * @return Singleton
     */
    public static ErrorStatsManager getManager() {
        return INSTANCE;
    }

    /**
     *
     * @param route
     * @param cause
     * @return data structure for holding count information for a route and cause
     */
    public ErrorStatsData getStats(String route, String cause) {
        Map map = routeMap.get(route);
        if (map == null) {
            return null;
        }
        return map.get(cause);
    }

    /**
     * updates count for the given route and error cause
     * @param route
     * @param cause
     */
    public void putStats(String route, String cause) {
        if (route == null) {
            route = "UNKNOWN_ROUTE";
        }
        route = route.replace("/", "_");
        ConcurrentHashMap statsMap = routeMap.get(route);
        if (statsMap == null) {
            statsMap = new ConcurrentHashMap();
            routeMap.putIfAbsent(route, statsMap);
        }
        ErrorStatsData sd = statsMap.get(cause);
        if (sd == null) {
            sd = new ErrorStatsData(route, cause);
            ErrorStatsData sd1 = statsMap.putIfAbsent(cause, sd);
            if (sd1 != null) {
                sd = sd1;
            } else {
                MonitorRegistry.getInstance().registerObject(sd);
            }
        }
        sd.update();
    }

    public static class UnitTest {}
}