subprojects/s4-core/src/main/java/org/apache/s4/core/DefaultCoreModule.java

/**

 * 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 java.io.IOException;
import java.io.InputStream;

import org.apache.commons.configuration.ConfigurationConverter;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.helix.participant.statemachine.StateModelFactory;
import org.apache.s4.base.Hasher;
import org.apache.s4.base.SerializerDeserializer;
import org.apache.s4.base.util.S4RLoaderFactory;
import org.apache.s4.comm.DefaultHasher;
import org.apache.s4.comm.helix.TaskStateModelFactory;
import org.apache.s4.comm.serialize.KryoSerDeser;
import org.apache.s4.comm.topology.RemoteStreamsManager;
import org.apache.s4.comm.topology.RemoteStreamsManagerImpl;
import org.apache.s4.core.ft.CheckpointingFramework;
import org.apache.s4.core.ft.NoOpCheckpointingFramework;
import org.apache.s4.deploy.AppStateModelFactory;
import org.apache.s4.deploy.DeploymentManager;
import org.apache.s4.deploy.DistributedDeploymentManager;
import org.apache.s4.deploy.HelixBasedDeploymentManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.AbstractModule;
import com.google.inject.Binder;
import com.google.inject.name.Names;

/**
 * Temporary module allowing assignment from ZK, communication through Netty, and distributed deployment management,
 * until we have a better way to customize node configuration
 * 
 */
public class DefaultCoreModule extends AbstractModule {

    private static Logger logger = LoggerFactory.getLogger(DefaultCoreModule.class);

    InputStream coreConfigFileInputStream;
    private PropertiesConfiguration config;

    String clusterName = null;

    public DefaultCoreModule(InputStream coreConfigFileInputStream) {
        this.coreConfigFileInputStream = coreConfigFileInputStream;
    }

    @Override
    protected void configure() {
        if (config == null) {
            loadProperties(binder());
        }
        if (coreConfigFileInputStream != null) {
            try {
                coreConfigFileInputStream.close();
            } catch (IOException ignored) {
            }
        }

        /* The hashing function to map keys top partitions. */
        bind(Hasher.class).to(DefaultHasher.class);

        /* Use Kryo to serialize events. */
        bind(SerializerDeserializer.class).to(KryoSerDeser.class);

        bind(StateModelFactory.class).annotatedWith(Names.named("s4.app.statemodelfactory")).to(
                AppStateModelFactory.class);

        bind(DeploymentManager.class).to(HelixBasedDeploymentManager.class);

        bind(RemoteSendersManager.class).to(RemoteSendersManagerImpl.class);

        bind(RemoteStreamsManager.class).to(RemoteStreamsManagerImpl.class);

        bind(S4RLoaderFactory.class);

        // For enabling checkpointing, one needs to use a custom module, such as
        // org.apache.s4.core.ft.FileSytemBasedCheckpointingModule
        bind(CheckpointingFramework.class).to(NoOpCheckpointingFramework.class);
    }

    private void loadProperties(Binder binder) {
        try {
            config = new PropertiesConfiguration();
            config.load(coreConfigFileInputStream);

            // TODO - validate properties.

            /* Make all properties injectable. Do we need this? */
            Names.bindProperties(binder, ConfigurationConverter.getProperties(config));

        } catch (ConfigurationException e) {
            binder.addError(e);
            e.printStackTrace();
        }
    }

}