/*
 * 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.dolphinscheduler.plugin.datasource.api.plugin;

import static java.lang.String.format;

import org.apache.dolphinscheduler.plugin.datasource.api.datasource.DataSourceProcessor;

import java.util.Collections;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DataSourceProcessorManager {

    private static final Logger logger = LoggerFactory.getLogger(DataSourceProcessorManager.class);

    private static final Map<String, DataSourceProcessor> dataSourceProcessorMap = new ConcurrentHashMap<>();

    public Map<String, DataSourceProcessor> getDataSourceProcessorMap() {
        return Collections.unmodifiableMap(dataSourceProcessorMap);
    }

    public void installProcessor() {

        ServiceLoader.load(DataSourceProcessor.class).forEach(factory -> {
            final String name = factory.getDbType().name();

            logger.info("start register processor: {}", name);
            if (dataSourceProcessorMap.containsKey(name)) {
                throw new IllegalStateException(format("Duplicate datasource plugins named '%s'", name));
            }
            loadDatasourceClient(factory);

            logger.info("done register processor: {}", name);

        });
    }

    private void loadDatasourceClient(DataSourceProcessor processor) {
        DataSourceProcessor instance = processor.create();
        dataSourceProcessorMap.put(processor.getDbType().name(), instance);
    }
}
