org.apache.asterix.tools.external.data.SocketClientAdapter Maven / Gradle / Ivy

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/*
 * 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.asterix.tools.external.data;

import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.asterix.common.feeds.api.IFeedAdapter;
import org.apache.hyracks.api.comm.IFrameWriter;
import org.apache.hyracks.api.context.IHyracksTaskContext;

public class SocketClientAdapter implements IFeedAdapter {

    private static final long serialVersionUID = 1L;

    private static final Logger LOGGER = Logger.getLogger(SocketClientAdapter.class.getName());

    private static final String LOCALHOST = "127.0.0.1";

    private static final long RECONNECT_PERIOD = 2000;

    private final String localFile;

    private final int port;

    private final IHyracksTaskContext ctx;

    private boolean continueStreaming = true;

    public SocketClientAdapter(Integer port, String localFile, IHyracksTaskContext ctx) {
        this.localFile = localFile;
        this.port = port;
        this.ctx = ctx;
    }

    @Override
    public void start(int partition, IFrameWriter writer) throws Exception {
        Socket socket = waitForReceiver();
        OutputStream os = socket.getOutputStream();
        FileInputStream fin = new FileInputStream(new File(localFile));
        byte[] chunk = new byte[1024];
        int read;
        try {
            while (continueStreaming) {
                read = fin.read(chunk);
                if (read > 0) {
                    os.write(chunk, 0, read);
                } else {
                    break;
                }
            }
            if (LOGGER.isLoggable(Level.INFO)) {
                LOGGER.info("Finished streaming file " + localFile + "to port [" + port + "]");
            }

        } finally {
            socket.close();
            fin.close();
        }

    }

    private Socket waitForReceiver() throws Exception {
        Socket socket = null;
        while (socket == null) {
            try {
                socket = new Socket(LOCALHOST, port);
            } catch (Exception e) {
                if (LOGGER.isLoggable(Level.WARNING)) {
                    LOGGER.warning("Receiver not ready, would wait for " + (RECONNECT_PERIOD / 1000)
                            + " seconds before reconnecting");
                }
                Thread.sleep(RECONNECT_PERIOD);
            }
        }
        return socket;
    }

    @Override
    public DataExchangeMode getDataExchangeMode() {
        return DataExchangeMode.PUSH;
    }

    @Override
    public void stop() throws Exception {
        continueStreaming = false;
    }

    @Override
    public boolean handleException(Exception e) {
        return false;
    }

}