/**
* 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.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.ServerAddress;
public class MongoCnxnManager {
private static final Logger logger = LoggerFactory
.getLogger(MongoCnxnManager.class);
private static Cache<ServerAddress, MongoClient> addressClientMap;
static {
addressClientMap = CacheBuilder.newBuilder().maximumSize(5)
.expireAfterAccess(10, TimeUnit.MINUTES)
.removalListener(new AddressCloser()).build();
}
private static class AddressCloser implements
RemovalListener<ServerAddress, MongoClient> {
@Override
public synchronized void onRemoval(
RemovalNotification<ServerAddress, MongoClient> removal) {
removal.getValue().close();
;
logger.debug("Closed connection to {}.", removal.getKey().toString());
}
}
public synchronized static MongoClient getClient(
List<ServerAddress> addresses, MongoClientOptions clientOptions)
throws UnknownHostException {
// Take the first replica from the replicated servers
ServerAddress serverAddress = addresses.get(0);
MongoClient client = addressClientMap.getIfPresent(serverAddress);
if (client == null) {
client = new MongoClient(addresses, clientOptions);
addressClientMap.put(serverAddress, client);
logger.debug("Created connection to {}.", serverAddress.toString());
logger.debug("Number of connections opened are {}.",
addressClientMap.size());
}
return client;
}
}