ExtractorClient.java

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 com.stratio.deep.core.extractor.client;

import java.util.List;

import javax.net.ssl.SSLException;

import org.apache.spark.Partition;

import com.stratio.deep.commons.config.ExtractorConfig;
import com.stratio.deep.commons.exception.DeepExtractorInitializationException;
import com.stratio.deep.commons.querybuilder.UpdateQueryBuilder;
import com.stratio.deep.commons.rdd.IExtractor;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

/**
 * The extractor client.
 */
public class ExtractorClient<T> implements IExtractor<T, ExtractorConfig<T>> {

    static final boolean SSL = System.getProperty("ssl") != null;

    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", "8463"));
    private static final long serialVersionUID = -7076154908311072669L;

    private transient EventLoopGroup group = new NioEventLoopGroup();

    private transient Channel ch;

    private ExtractorClientHandler<T> handler;

    public ExtractorClient initialize() throws DeepExtractorInitializationException {
        try {
            // Configure SSL.
            final SslContext sslCtx;
            if (SSL) {

                sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);

            } else {
                sslCtx = null;
            }

            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class).handler(new ExtractorClientInitializer<T>(sslCtx));

            // Make a new connection.
            this.ch = b.connect(HOST, PORT).sync().channel();

            // Get the handler instance to initiate the request.
            this.handler = ch.pipeline().get(ExtractorClientHandler.class);
        } catch (SSLException | InterruptedException e) {
            throw new DeepExtractorInitializationException(e);

        }
        return this;
    }

    public void finish() {
        ch.close();
        group.shutdownGracefully();
    }

    @Override
    public boolean hasNext() {
        return handler.hasNext();
    }

    @Override
    public T next() {
        return handler.next();
    }

    @Override
    public void initIterator(Partition dp, ExtractorConfig<T> config) {
        handler.initIterator(dp, config);
    }

    @Override
    public void saveRDD(T t) {
        handler.saveRDD(t);
    }

    @Override
    public void initSave(ExtractorConfig<T> config, T first, UpdateQueryBuilder queryBuilder) {
        handler.initSave(config, first, queryBuilder);
    }

    @Override
    public List<String> getPreferredLocations(Partition split) {
        return null;
    }

    @Override
    public void close() {
        handler.close();
        return;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.stratio.deep.rdd.IDeepRDD#getPartitions(IDeepJobConfig, int)
     */
    @Override
    public Partition[] getPartitions(ExtractorConfig<T> config) {
        return this.handler.getPartitions(config);
    }

}