org.springframework.social.twitter.api.impl.StreamDispatcher.java Source code

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Here is the source code for org.springframework.social.twitter.api.impl.StreamDispatcher.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed 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.springframework.social.twitter.api.impl;

import java.io.IOException;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.social.twitter.api.DirectMessage;
import org.springframework.social.twitter.api.StreamDeleteEvent;
import org.springframework.social.twitter.api.StreamEvent;
import org.springframework.social.twitter.api.StreamListener;
import org.springframework.social.twitter.api.StreamWarningEvent;
import org.springframework.social.twitter.api.Tweet;
import org.springframework.social.twitter.api.TwitterProfile;

import com.fasterxml.jackson.databind.ObjectMapper;

class StreamDispatcher implements Runnable {
    private static final Log logger = LogFactory.getLog(StreamDispatcher.class);

    private final List<StreamListener> listeners;

    private ObjectMapper objectMapper;

    private AtomicBoolean active;

    private final Queue<String> queue;

    private final ExecutorService pool;

    public StreamDispatcher(Queue<String> queue, List<StreamListener> listeners) {
        this.queue = queue;
        this.listeners = listeners;
        pool = Executors.newCachedThreadPool();
        objectMapper = new ObjectMapper();
        objectMapper.addMixInAnnotations(Tweet.class, TweetMixin.class);
        objectMapper.addMixInAnnotations(StreamDeleteEvent.class, StreamDeleteEventMixin.class);
        objectMapper.addMixInAnnotations(StreamWarningEvent.class, StreamWarningEventMixin.class);
        objectMapper.addMixInAnnotations(StreamEvent.class, StreamEventMixin.class);
        objectMapper.addMixInAnnotations(DirectMessage.class, DirectMessageMixin.class);
        objectMapper.addMixInAnnotations(TwitterProfile.class, TwitterProfileMixin.class);
        active = new AtomicBoolean(true);
    }

    public void run() {
        while (active.get()) {
            String line = queue.poll();
            if (line == null || line.length() == 0)
                return;

            // TODO: handle scrub_geo, status_withheld, user_withheld, disconnect, friends, events, 

            logger.debug(line);

            try {
                if (line.contains("in_reply_to_status_id_str")) { // TODO: This is kinda hacky
                    handleTweet(line);
                } else if (line.startsWith("{\"limit")) {
                    handleLimit(line);
                } else if (line.startsWith("{\"delete")) {
                    handleDelete(line);
                } else if (line.startsWith("{\"warning")) {
                    handleWarning(line);
                } else if (line.startsWith("{\"event")) {
                    handleEvent(line);
                } else if (line.startsWith("{\"direct_message")) {
                    handleDirectMessage(line);
                }
            } catch (IOException e) {
                // TODO: Should only happen if Jackson doesn't know how to map the line
            }
        }
    }

    public void stop() {
        active.set(false);
        pool.shutdown();
    }

    private void handleDelete(String line) throws IOException {
        final StreamDeleteEvent deleteEvent = objectMapper.readValue(line, StreamDeleteEvent.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onDelete(deleteEvent);
                }
            }));
        }
    }

    private void handleLimit(String line) throws IOException {
        final TrackLimitEvent limitEvent = objectMapper.readValue(line, TrackLimitEvent.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onLimit(limitEvent.getNumberOfLimitedTweets());
                }
            }));
        }
    }

    private void handleTweet(String line) throws IOException {
        final Tweet tweet = objectMapper.readValue(line, Tweet.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onTweet(tweet);
                }
            }));
        }
    }

    private void handleWarning(String line) throws IOException {
        final StreamWarningEvent warningEvent = objectMapper.readValue(line, StreamWarningEvent.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onWarning(warningEvent);
                }
            }));
        }
    }

    private void handleEvent(String line) throws IOException {
        final StreamEvent event = objectMapper.readValue(line, StreamEvent.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onEvent(event);
                }
            }));
        }
    }

    private void handleDirectMessage(String line) throws IOException {
        String messagePart = objectMapper.readTree(line).get("direct_message").toString();
        final DirectMessage directMessage = objectMapper.readValue(messagePart, DirectMessage.class);
        for (final StreamListener listener : listeners) {
            Future<?> result = pool.submit((new Runnable() {
                public void run() {
                    listener.onDirectMessage(directMessage);
                }
            }));
        }
    }

}