dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/registry/common/StatusManager.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.dubbo.admin.registry.common;

import com.alibaba.dubbo.common.status.Status;
import com.alibaba.dubbo.common.status.Status.Level;
import com.alibaba.dubbo.common.status.StatusChecker;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * StatusManager
 *
 */
public class StatusManager {

    private static final StatusManager INSTANCE = new StatusManager();
    private final Map<String, StatusChecker> statusHandlers = new ConcurrentHashMap<String, StatusChecker>();

    private StatusManager() {
    }

    public static StatusManager getInstance() {
        return INSTANCE;
    }

    public static Status getStatusSummary(Map<String, Status> statusList) {
        return getSummaryStatus(statusList);
    }

    public static Status getSummaryStatus(Map<String, Status> statuses) {
        Level level = Level.OK;
        StringBuilder msg = new StringBuilder();
        for (Map.Entry<String, Status> entry : statuses.entrySet()) {
            String key = entry.getKey();
            Status status = entry.getValue();
            Level l = status.getLevel();
            if (Level.ERROR.equals(l)) {
                level = Level.ERROR;
                if (msg.length() > 0) {
                    msg.append(",");
                }
                msg.append(key);
            } else if (Level.WARN.equals(l)) {
                if (!Level.ERROR.equals(level)) {
                    level = Level.WARN;
                }
                if (msg.length() > 0) {
                    msg.append(",");
                }
                msg.append(key);
            }
        }
        return new Status(level, msg.toString());
    }

    public void addStatusHandler(String name, StatusChecker statusHandler) {
        this.statusHandlers.put(name, statusHandler);
    }

    public void addStatusHandlers(Map<String, StatusChecker> statusHandlers) {
        this.statusHandlers.putAll(statusHandlers);
    }

    public void addStatusHandlers(Collection<StatusChecker> statusHandlers) {
        for (StatusChecker statusChecker : statusHandlers) {
            String name = statusChecker.getClass().getSimpleName();
            if (name.endsWith(StatusChecker.class.getSimpleName())) {
                name = name.substring(0, name.length() - StatusChecker.class.getSimpleName().length());
            }
            this.statusHandlers.put(name, statusChecker);
        }
    }

    public void removeStatusHandler(String name) {
        this.statusHandlers.remove(name);
    }

    public void clearStatusHandlers() {
        this.statusHandlers.clear();
    }

    public Map<String, Status> getStatusList() {
        return getStatusList(null);
    }

    /**
     * Exclude items do not need to show in Summary Page
     */
    public Map<String, Status> getStatusList(String[] excludes) {
        Map<String, Status> statuses = new HashMap<String, Status>();
        Map<String, StatusChecker> temp = new HashMap<String, StatusChecker>();
        temp.putAll(statusHandlers);
        if (excludes != null && excludes.length > 0) {
            for (String exclude : excludes) {
                temp.remove(exclude);
            }
        }
        for (Map.Entry<String, StatusChecker> entry : temp.entrySet()) {
            statuses.put(entry.getKey(), entry.getValue().check());
        }
        return statuses;
    }

}