/*
* 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.runtime.RuntimeModule;
import com.google.inject.AbstractModule;
import com.google.inject.Module;
import com.google.inject.PrivateModule;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import com.google.inject.name.Names;
import org.apache.twill.discovery.DiscoveryService;
import org.apache.twill.discovery.DiscoveryServiceClient;
import org.apache.twill.discovery.InMemoryDiscoveryService;
import org.apache.twill.discovery.ZKDiscoveryService;
import org.apache.twill.zookeeper.ZKClient;
/**
* Provides Guice bindings for DiscoveryService and DiscoveryServiceClient for different
* runtime environments.
*/
public final class DiscoveryRuntimeModule extends RuntimeModule {
@Override
public Module getInMemoryModules() {
return new InMemoryDiscoveryModule();
}
@Override
public Module getStandaloneModules() {
return new InMemoryDiscoveryModule();
}
@Override
public Module getDistributedModules() {
return new ZKDiscoveryModule();
}
private static final class InMemoryDiscoveryModule extends AbstractModule {
// ensuring to be singleton across JVM
private static final InMemoryDiscoveryService IN_MEMORY_DISCOVERY_SERVICE = new InMemoryDiscoveryService();
@Override
protected void configure() {
InMemoryDiscoveryService discovery = IN_MEMORY_DISCOVERY_SERVICE;
bind(DiscoveryService.class).toInstance(discovery);
bind(DiscoveryServiceClient.class).toInstance(discovery);
}
}
private static final class ZKDiscoveryModule extends PrivateModule {
@Override
protected void configure() {
bind(DiscoveryService.class).to(ZKDiscoveryService.class);
bind(DiscoveryServiceClient.class)
.annotatedWith(Names.named("local.discovery.client"))
.to(ZKDiscoveryService.class);
bind(DiscoveryServiceClient.class).to(ProgramDiscoveryServiceClient.class);
expose(DiscoveryService.class);
expose(DiscoveryServiceClient.class);
}
@Provides
@Singleton
private ZKDiscoveryService providesDiscoveryService(ZKClient zkClient) {
return new ZKDiscoveryService(zkClient);
}
}
}