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/*
 * Copyright 1999-2011 Alibaba Group.
 *
 *  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 net.jahhan.extension.dataStore;

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

import javax.inject.Singleton;

import net.jahhan.common.extension.annotation.Extension;
import net.jahhan.spi.DataStore;

/**
 * @author ding.lid
 * @author kimi
 */
@Extension("simple")
@Singleton
public class SimpleDataStore implements DataStore {

    // <组件类名或标识, <数据名, 数据值>>
    private ConcurrentMap> data =
        new ConcurrentHashMap>();

    public Map get(String componentName) {
        ConcurrentMap value = data.get(componentName);
        if(value == null) return new HashMap();

        return new HashMap(value);
    }

    public Object get(String componentName, String key) {
        if (!data.containsKey(componentName)) {
            return null;
        }
        return data.get(componentName).get(key);
    }

    public void put(String componentName, String key, Object value) {
        Map componentData = data.get(componentName);
        if(null == componentData) {
            data.putIfAbsent(componentName, new ConcurrentHashMap());
            componentData = data.get(componentName);
        }
        componentData.put(key, value);
    }

    public void remove(String componentName, String key) {
        if (!data.containsKey(componentName)) {
            return;
        }
        data.get(componentName).remove(key);
    }

}