StreamAdminModules.java

/*
 * Copyright © 2015 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.data.stream;

import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.common.runtime.RuntimeModule;
import co.cask.cdap.data.runtime.InMemoryStreamFileWriterFactory;
import co.cask.cdap.data.runtime.LocationStreamFileWriterFactory;
import co.cask.cdap.data.stream.service.MDSStreamMetaStore;
import co.cask.cdap.data.stream.service.StreamMetaStore;
import co.cask.cdap.data2.transaction.stream.AbstractStreamFileConsumerFactory;
import co.cask.cdap.data2.transaction.stream.FileStreamAdmin;
import co.cask.cdap.data2.transaction.stream.StreamAdmin;
import co.cask.cdap.data2.transaction.stream.StreamConsumerFactory;
import co.cask.cdap.data2.transaction.stream.StreamConsumerStateStoreFactory;
import co.cask.cdap.data2.transaction.stream.hbase.HBaseStreamConsumerStateStoreFactory;
import co.cask.cdap.data2.transaction.stream.hbase.HBaseStreamFileConsumerFactory;
import co.cask.cdap.data2.transaction.stream.inmemory.InMemoryStreamConsumerFactory;
import co.cask.cdap.data2.transaction.stream.inmemory.InMemoryStreamConsumerStateStoreFactory;
import co.cask.cdap.data2.transaction.stream.leveldb.LevelDBStreamConsumerStateStoreFactory;
import co.cask.cdap.data2.transaction.stream.leveldb.LevelDBStreamFileConsumerFactory;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.Singleton;

/**
 * Guice modules to have access to a {@link StreamAdmin} implementation.
 */
public class StreamAdminModules extends RuntimeModule {

  @Override
  public Module getInMemoryModules() {
    return new AbstractModule() {
      @Override
      protected void configure() {
        bind(StreamAdmin.class).to(FileStreamAdmin.class).in(Singleton.class);
        bind(StreamCoordinatorClient.class).to(InMemoryStreamCoordinatorClient.class).in(Singleton.class);
        bind(StreamMetaStore.class).to(MDSStreamMetaStore.class).in(Singleton.class);
        bind(StreamConsumerFactory.class).to(InMemoryStreamConsumerFactory.class).in(Singleton.class);
        bind(StreamConsumerStateStoreFactory.class)
          .to(InMemoryStreamConsumerStateStoreFactory.class).in(Singleton.class);
        bind(StreamFileWriterFactory.class).to(InMemoryStreamFileWriterFactory.class).in(Singleton.class);
      }
    };
  }

  @Override
  public Module getStandaloneModules() {
    return new AbstractModule() {
      @Override
      protected void configure() {
        bind(StreamCoordinatorClient.class).to(InMemoryStreamCoordinatorClient.class).in(Singleton.class);
        bind(StreamMetaStore.class).to(MDSStreamMetaStore.class).in(Singleton.class);
        bind(StreamConsumerStateStoreFactory.class)
          .to(LevelDBStreamConsumerStateStoreFactory.class).in(Singleton.class);
        bind(StreamAdmin.class).to(FileStreamAdmin.class).in(Singleton.class);
        bind(StreamConsumerFactory.class).to(LevelDBStreamFileConsumerFactory.class).in(Singleton.class);
        bind(StreamFileWriterFactory.class).to(LocationStreamFileWriterFactory.class).in(Singleton.class);
      }
    };
  }

  private static final class StreamConsumerFactoryProvider implements Provider<AbstractStreamFileConsumerFactory> {
    private final Injector injector;
    private final CConfiguration cConf;

    @Inject
    private StreamConsumerFactoryProvider(Injector injector, CConfiguration cConf) {
        this.injector = injector;
        this.cConf = cConf;
    }

    @Override
    public AbstractStreamFileConsumerFactory get() {
      Class<? extends AbstractStreamFileConsumerFactory> factoryClass;
      String factoryName = cConf.get(Constants.Dataset.Extensions.STREAM_CONSUMER_FACTORY);

      if (factoryName != null) {
        try {
          factoryClass = (Class<? extends AbstractStreamFileConsumerFactory>) Class.forName(factoryName.trim());
        } catch (ClassCastException | ClassNotFoundException ex) {
          // Guice frowns on throwing exceptions from Providers, but if necesary use RuntimeException
          throw new RuntimeException("Unable to obtain stream consumer factory extension class", ex);
        }
      } else {
        factoryClass = HBaseStreamFileConsumerFactory.class;
      }
      return injector.getInstance(factoryClass);
    }
  }

  @Override
  public Module getDistributedModules() {
    return new AbstractModule() {
      @Override
      protected void configure() {
        bind(StreamCoordinatorClient.class).to(DistributedStreamCoordinatorClient.class).in(Singleton.class);
        bind(StreamMetaStore.class).to(MDSStreamMetaStore.class).in(Singleton.class);
        bind(StreamConsumerStateStoreFactory.class).to(HBaseStreamConsumerStateStoreFactory.class).in(Singleton.class);
        bind(StreamAdmin.class).to(FileStreamAdmin.class).in(Singleton.class);
        bind(StreamConsumerFactory.class).toProvider(StreamConsumerFactoryProvider.class).in(Singleton.class);
        bind(StreamFileWriterFactory.class).to(LocationStreamFileWriterFactory.class).in(Singleton.class);
      }
    };
  }
}