/**
* 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.s4.core;
import org.I0Itec.zkclient.serialize.ZkSerializer;
import org.apache.s4.comm.topology.ZNRecordSerializer;
import org.apache.s4.comm.topology.ZkClient;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
/**
*
* Provides a connection to ZooKeeper through the {@link ZkClient} class.
*
* As an application singleton, it provides a single shared connection for an S4 node.
*
*/
@Singleton
// injected only once per node
public class ZkClientProvider implements Provider<ZkClient> {
private final ZkClient zkClient;
@Inject
public ZkClientProvider(@Named("s4.cluster.zk_address") String zookeeperAddress,
@Named("s4.cluster.zk_session_timeout") int sessionTimeout,
@Named("s4.cluster.zk_connection_timeout") int connectionTimeout) {
zkClient = new ZkClient(zookeeperAddress, sessionTimeout, connectionTimeout);
ZkSerializer serializer = new ZNRecordSerializer();
zkClient.setZkSerializer(serializer);
}
@Override
public ZkClient get() {
// reuses initialized instance
return zkClient;
}
}