org.jandroid2cloud.connection.ChannelHandler.java Source code

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Here is the source code for org.jandroid2cloud.connection.ChannelHandler.java

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/*******************************************************************************
 * The MIT License
 * 
 * Copyright (c) 2011 Florian Sellmayr
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/

package org.jandroid2cloud.connection;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

import javax.swing.plaf.basic.BasicBorders.MarginBorder;

import org.GAEChannel4j.IChannelHandler;
import org.eclipse.jetty.util.ajax.JSONObjectConvertor;
import org.jandroid2cloud.configuration.Configuration;
import org.jandroid2cloud.exceptions.NetworkException;
import org.jandroid2cloud.linkhandling.LinkQueue;
import org.jandroid2cloud.ui.notifications.NotificationAppender;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.scribe.model.Verb;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;

public class ChannelHandler implements IChannelHandler {
    private Configuration config;
    private OAuthTool oauth;
    private static final Logger logger = LoggerFactory.getLogger(ChannelHandler.class);

    private String waitingFor;
    private Semaphore waitingForSema = new Semaphore(0);
    private boolean received = false;

    public ChannelHandler(Configuration config, OAuthTool oauth) {
        this.config = config;
        this.oauth = oauth;
    }

    @Override
    public void open() {
        logger.info(NotificationAppender.MARKER, "Server confirmed: Channel is open");
        String username = "";
        try {
            username = oauth.makeRequest("http://" + config.getHost() + "/connected/" + config.getIdentifier(),
                    Verb.POST, null);
        } catch (NetworkException e) {
            logger.error(NotificationAppender.MARKER,
                    "Error: Channel to server is open but connection could not be confirmed.\nNo messages will be received",
                    e);
        }
        logger.debug("Using username" + username);
    }

    @Override
    public void message(String rawMsg) {
        logger.debug("Received message from server:" + rawMsg);

        try {
            JSONObject jsonMessage = new JSONObject(new JSONTokener(rawMsg));
            JSONObject links = (JSONObject) jsonMessage.opt("links");
            if (links == null) {
                JSONObject link = jsonMessage.optJSONObject("link");
                handleLink(link);
            } else {
                Iterator it = links.keys();
                while (it.hasNext()) {
                    String s = (String) it.next();
                    if (s != null && !s.isEmpty()) {
                        JSONObject o = links.getJSONObject(s);
                        handleLink(o);
                    }
                }
            }

            Map<String, String> params = new HashMap<String, String>();
            params.put("links", rawMsg);
            String response = oauth.makeRequest("http://" + config.getHost() + "/markread", Verb.POST, params);
            logger.debug("Marked message as read");
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (NetworkException e) {
            logger.error(NotificationAppender.MARKER, "Could not mark links as read.\n"
                    + "You will not receive more links until that is done.\n" + "See log for details", e);
        }
    }

    private void handleLink(JSONObject link) throws JSONException {
        if (link.has("link")) {
            link = link.getJSONObject("link");
        }
        String url = link.getString("url");
        if (url.equals(waitingFor)) {
            received = true;
            waitingForSema.release(1);
        } else {
            logger.info(NotificationAppender.MARKER, "new link " + url + " received.");
            LinkQueue.INSTANCE.push(url);
        }
    }

    @Override
    public void close() {
        logger.warn("Server closed connection");
    }

    @Override
    public void error(String description, double code) {
        logger.error("error " + code + ": " + description);
    }

    public boolean waitForLink(String sentLink) {
        try {
            waitingForSema.tryAcquire(config.getTimeoutForConnectionTest(), TimeUnit.MILLISECONDS);
        } catch (InterruptedException e) {
            logger.warn(
                    "waiting for server response in connection test was interrupted. This may result in the false assumption that the connection was lost.",
                    e);
        }
        return received;
    }

    public void setLinkToWaitFor(String link) {
        received = false;
        waitingFor = link;
    }

}