de.dsi8.dsi8acl.connection.impl.MessageListenerThread.java Source code

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Here is the source code for de.dsi8.dsi8acl.connection.impl.MessageListenerThread.java

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/*******************************************************************************
 * Copyright (C) 2012 Henrik Vo und Sven Nobis
 * 
 * This file is part of DSI8AndroidCommunicationLibrary
 * (https://github.com/SvenTo/DSI8AndroidCommunicationLibrary)
 * 
 * DSI8AndroidCommunicationLibrary is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ******************************************************************************/
package de.dsi8.dsi8acl.connection.impl;

import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.util.Iterator;

import android.os.Handler;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;

import de.dsi8.dsi8acl.connection.model.Message;

/**
 * A {@link Thread}, that wait for data on input stream and converts it to a {@link Message} and tells it to the initiator.
 * @author sven
 */
class MessageListenerThread extends Thread {

    /**
     * The one, that want to know when something happen.
     */
    private final SocketConnection initiator;

    /**
     * Handler for posting back received messages.
     */
    private Handler handler;

    /**
     * Default constructor.
     * @param initiator The one, that want to know when something happen.
     * @param handler For post back messages to the {@link SocketConnection} (into the main thread).
     */
    public MessageListenerThread(SocketConnection initiator, Handler handler) {
        this.initiator = initiator;
        this.handler = handler;
    }

    /**
     * Converts the data from {@link InputStream} of {@link Socket} from
     * JSON format into a concrete {@link Message}.
     */
    @Override
    public void run() {
        try {
            InputStream inputStream = initiator.getSocket().getInputStream();
            ObjectMapper objectMapper = initiator.getJsonObjectMapper();
            JsonFactory factory = objectMapper.getJsonFactory();

            JsonParser jsonParser = factory.createJsonParser(inputStream);
            Iterator<Message> iterator = jsonParser.readValuesAs(Message.class);

            while (!isInterrupted() && iterator.hasNext()) {
                Message msg = iterator.next();
                messageRecived(msg);
            }

            if (!isInterrupted()) {
                // The stream was closed but the thread wasn't stopped. That's bad.
                throw new IOException("Unexpected close of InputStream.");
            }
        } catch (Exception e) {
            connectionProblem(e);
        }
    }

    /**
     * {@link Handler#post} a received {@link Message} to the {@link #initiator} (into the main thread). 
     * @param msg The received {@link Message}
     */
    private void messageRecived(final Message msg) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                initiator.messageRecived(msg);
            }
        });
    }

    /**
     * {@link Handler#post} to the {@link #initiator} (into the main thread)
     * that an {@link SocketConnection#connectionProblem} occurred.
     * @param e The Problem
     */
    private void connectionProblem(final Exception e) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                initiator.connectionProblem(e);
            }
        });
    }
}