/*
 * Copyright © 2016-2018 European Support Limited
 *
 * 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 org.onap.config.api;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.ServiceLoader;

public interface ConfigurationManager extends Configuration {

    Configuration CONFIG = lookup();

    static Configuration lookup() {

        if (CONFIG == null) {
            ServiceLoader<ConfigurationManager> loader = ServiceLoader.load(ConfigurationManager.class);
            Iterator<ConfigurationManager> configManagers = loader.iterator();
            return configManagers.hasNext() ? configManagers.next() : null;
        }

        return CONFIG;
    }

    String getConfigurationValue(Map<String, Object> queryData);

    void updateConfigurationValue(Map<String, Object> updateData);

    Map<String, String> listConfiguration(Map<String, Object> query);

    boolean updateConfigurationValues(String tenant, String namespace, Map configKeyValueStore);

    Collection<String> getTenants();

    Collection<String> getNamespaces();

    Collection<String> getKeys(String tenant, String namespace);
}