/*
 * Copyright 2023 Ververica 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.ververica.cdc.connectors.mongodb.source.connection;

import com.mongodb.ConnectionString;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.ververica.cdc.connectors.mongodb.source.config.MongoDBSourceConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/** A MongoDB Client pools. */
public class MongoClientPool {

    private static final Logger LOG = LoggerFactory.getLogger(MongoClientPool.class);

    private static final MongoClientPool INSTANCE = new MongoClientPool();
    private final Map<String, MongoClient> pools = new ConcurrentHashMap<>();

    private MongoClientPool() {}

    public static MongoClientPool getInstance() {
        return INSTANCE;
    }

    public MongoClient getOrCreateMongoClient(MongoDBSourceConfig sourceConfig) {
        return pools.computeIfAbsent(
                sourceConfig.getConnectionString(),
                rawConnectionString -> {
                    ConnectionString connectionString = new ConnectionString(rawConnectionString);
                    LOG.info(
                            "Create and register mongo client {}@{}",
                            connectionString.getUsername(),
                            connectionString.getHosts());
                    return MongoClients.create(connectionString);
                });
    }
}
