subprojects/s4-example/src/main/java/org/apache/s4/example/counter/Module.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.example.counter;

import java.io.InputStream;

import org.apache.commons.configuration.ConfigurationConverter;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.ConfigurationUtils;
import org.apache.commons.configuration.PropertiesConfiguration;

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

/**
 * Configures the controller.
 * 
 * Reads a properties file, provides a {@link Communicator} singleton, and configures Guice bindings.
 * 
 * @author Leo Neumeyer
 */
public class Module extends AbstractModule {

    protected PropertiesConfiguration config = null;

    private void loadProperties(Binder binder) {

        try {
            InputStream is = this.getClass().getResourceAsStream("/s4-piper-example.properties");
            config = new PropertiesConfiguration();
            config.load(is);

            System.out.println(ConfigurationUtils.toString(config));
            // 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();
        }
    }

    @Override
    protected void configure() {

        // TODO use the default module
        // if (config == null)
        // loadProperties(binder());
        //
        // bind(MyApp.class);
        //
        // bind(PhysicalCluster.class);
        //
        // /* Configure static assignment using a configuration file. */
        // bind(Assignment.class).to(AssignmentFromFile.class);
        //
        // /* Configure a static cluster topology using a configuration file. */
        // bind(Cluster.class).to(TopologyFromFile.class);
        //
        // // bind(Emitter.class).annotatedWith(Names.named("ll")).to(NettyEmitter.class);
        // // bind(Listener.class).annotatedWith(Names.named("ll")).to(NettyListener.class);
        // //
        // // bind(Emitter.class).to(QueueingEmitter.class);
        // // bind(Listener.class).to(QueueingListener.class);
        //
        // /* Use the Netty comm layer implementation. */
        // // bind(Emitter.class).to(NettyEmitter.class);
        // // bind(Listener.class).to(NettyListener.class);
        //
        // /* Use a simple UDP comm layer implementation. */
        // bind(Emitter.class).to(UDPEmitter.class);
        // bind(Listener.class).to(UDPListener.class);
        //
        // /* 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);

    }
}