/*
* Copyright © 2014 Cask Data, 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 co.cask.cdap.common.guice;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.KafkaConstants;
import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import org.apache.twill.internal.kafka.client.ZKKafkaClientService;
import org.apache.twill.kafka.client.KafkaClient;
import org.apache.twill.kafka.client.KafkaClientService;
import org.apache.twill.zookeeper.ZKClient;
import org.apache.twill.zookeeper.ZKClients;
/**
* Guice module for {@link KafkaClient} and {@link KafkaClientService}. Requires bindings from
* {@link ConfigModule} and {@link ZKClientModule}.
*/
public class KafkaClientModule extends AbstractModule {
@Override
protected void configure() {
/**
* Bindings to {@link KafkaClientService} is done by
* {@link #providesKafkaClientService(CConfiguration, ZKClient)}
*/
bind(KafkaClient.class).to(KafkaClientService.class);
}
@Provides
@Singleton
private KafkaClientService providesKafkaClientService(CConfiguration cConf, ZKClient zkClient) {
String kafkaZKNamespace = cConf.get(KafkaConstants.ConfigKeys.ZOOKEEPER_NAMESPACE_CONFIG);
return new ZKKafkaClientService(
kafkaZKNamespace == null ? zkClient : ZKClients.namespace(zkClient, "/" + kafkaZKNamespace)
);
}
}