org.apache.drill.exec.store.mongo.MongoCnxnManager.java Source code

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Here is the source code for org.apache.drill.exec.store.mongo.MongoCnxnManager.java

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/**
 * 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.drill.exec.store.mongo;

import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

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

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;

public class MongoCnxnManager {

    private static final Logger logger = LoggerFactory.getLogger(MongoCnxnManager.class);
    private static Cache<MongoCnxnKey, MongoClient> addressClientMap;

    static {
        addressClientMap = CacheBuilder.newBuilder().maximumSize(5).expireAfterAccess(10, TimeUnit.MINUTES)
                .removalListener(new AddressCloser()).build();
    }

    private static class AddressCloser implements RemovalListener<MongoCnxnKey, MongoClient> {
        @Override
        public synchronized void onRemoval(RemovalNotification<MongoCnxnKey, MongoClient> removal) {
            removal.getValue().close();
            logger.debug("Closed connection to {}.", removal.getKey().toString());
        }
    }

    public synchronized static MongoClient getClient(List<ServerAddress> addresses,
            MongoClientOptions clientOptions, MongoCredential credential) throws UnknownHostException {
        // Take the first replica from the replicated servers
        ServerAddress serverAddress = addresses.get(0);
        String userName = credential == null ? null : credential.getUserName();
        MongoCnxnKey key = new MongoCnxnKey(serverAddress, userName);
        MongoClient client = addressClientMap.getIfPresent(key);
        if (client == null) {
            if (credential != null) {
                List<MongoCredential> credentialList = Arrays.asList(credential);
                client = new MongoClient(addresses, credentialList, clientOptions);
            } else {
                client = new MongoClient(addresses, clientOptions);
            }
            addressClientMap.put(key, client);
            logger.debug("Created connection to {}.", key.toString());
            logger.debug("Number of open connections {}.", addressClientMap.size());
        }
        return client;
    }
}