| /* |
| * 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.cassandra.sidecar.common; |
| |
| import java.net.InetSocketAddress; |
| import java.util.Collections; |
| |
| import javax.annotation.Nullable; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datastax.driver.core.Cluster; |
| import com.datastax.driver.core.ConsistencyLevel; |
| import com.datastax.driver.core.NettyOptions; |
| import com.datastax.driver.core.QueryOptions; |
| import com.datastax.driver.core.Session; |
| import com.datastax.driver.core.policies.ExponentialReconnectionPolicy; |
| import com.datastax.driver.core.policies.ReconnectionPolicy; |
| import com.datastax.driver.core.policies.RoundRobinPolicy; |
| import com.datastax.driver.core.policies.WhiteListPolicy; |
| |
| /** |
| * Represents a connection to Cassandra cluster. Currently supports returning the local connection only as |
| * defined in the Configuration. |
| */ |
| public class CQLSession |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CQLSession.class); |
| |
| @Nullable |
| private Session localSession; |
| private final InetSocketAddress inet; |
| private final WhiteListPolicy wlp; |
| private NettyOptions nettyOptions; |
| private QueryOptions queryOptions; |
| private ReconnectionPolicy reconnectionPolicy; |
| |
| public CQLSession(String host, Integer port, Integer healthCheckFrequency) |
| { |
| // this was originally using unresolved Inet addresses, but it would fail when trying to |
| // connect to a docker container |
| logger.info("Connecting to {} on port {}", host, port); |
| inet = new InetSocketAddress(host, port); |
| |
| wlp = new WhiteListPolicy(new RoundRobinPolicy(), Collections.singletonList(inet)); |
| this.nettyOptions = new NettyOptions(); |
| this.queryOptions = new QueryOptions().setConsistencyLevel(ConsistencyLevel.ONE); |
| this.reconnectionPolicy = new ExponentialReconnectionPolicy(1000, healthCheckFrequency); |
| } |
| |
| public CQLSession(InetSocketAddress target, NettyOptions options) |
| { |
| inet = target; |
| wlp = new WhiteListPolicy(new RoundRobinPolicy(), Collections.singletonList(inet)); |
| this.nettyOptions = options; |
| this.queryOptions = new QueryOptions().setConsistencyLevel(ConsistencyLevel.ONE); |
| reconnectionPolicy = new ExponentialReconnectionPolicy(100, 1000); |
| } |
| |
| /** |
| * Provides a Session connected only to the local node from configuration. If null it means the the connection was |
| * not able to be established. The session still might throw a NoHostAvailableException if the local host goes |
| * offline or otherwise unavailable. |
| * |
| * @return Session |
| */ |
| @Nullable |
| public synchronized Session getLocalCql() |
| { |
| Cluster cluster = null; |
| try |
| { |
| if (localSession == null) |
| { |
| logger.info("Connecting to {}", inet); |
| cluster = Cluster.builder() |
| .addContactPointsWithPorts(inet) |
| .withLoadBalancingPolicy(wlp) |
| .withQueryOptions(queryOptions) |
| .withReconnectionPolicy(reconnectionPolicy) |
| .withoutMetrics() |
| // tests can create a lot of these Cluster objects, to avoid creating HWTs and |
| // event thread pools for each we have the override |
| .withNettyOptions(nettyOptions) |
| .build(); |
| localSession = cluster.connect(); |
| logger.info("Successfully connected to Casssandra instance!"); |
| } |
| } |
| catch (Exception e) |
| { |
| logger.error("Failed to reach Cassandra", e); |
| if (cluster != null) |
| { |
| try |
| { |
| cluster.close(); |
| } |
| catch (Exception ex) |
| { |
| logger.error("Failed to close cluster in cleanup", ex); |
| } |
| } |
| } |
| return localSession; |
| } |
| |
| public synchronized void close() |
| { |
| if (localSession != null) |
| { |
| localSession.getCluster().close(); |
| localSession = null; |
| } |
| } |
| } |