biz.varkon.shelvesom.provider.comics.ComicsUpdater.java Source code

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Here is the source code for biz.varkon.shelvesom.provider.comics.ComicsUpdater.java

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/*
 * Copyright (C) 2008 Romain Guy
 * Copyright (C) 2010 Garen J. Torikian
 * 
 * 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 biz.varkon.shelvesom.provider.comics;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.HashMap;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Process;

import biz.varkon.shelvesom.base.BaseItem;
import biz.varkon.shelvesom.util.HttpManager;
import biz.varkon.shelvesom.util.ImageUtilities;
import biz.varkon.shelvesom.util.ImportUtilities;
import biz.varkon.shelvesom.util.Preferences;

public class ComicsUpdater implements Runnable {
    private static final String LOG_TAG = "ComicsUpdater";

    private static final long ONE_DAY = 24 * 60 * 60 * 1000;

    private static final HashMap<String, Long> sLastChecks = new HashMap<String, Long>();

    private final BlockingQueue<String> mQueue = new ArrayBlockingQueue<String>(12);
    private final ContentResolver mResolver;
    private final SimpleDateFormat mLastModifiedFormat;
    private final String mSelection;
    private final String[] mArguments = new String[1];
    private final ContentValues mValues = new ContentValues();

    private Thread mThread;
    private volatile boolean mStopped;

    public ComicsUpdater(Context context) {
        mResolver = context.getContentResolver();
        mLastModifiedFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
        mSelection = BaseItem._ID + "=?";
    }

    public void start() {
        if (mThread == null) {
            mStopped = false;
            mThread = new Thread(this, "ComicsUpdater");
            mThread.start();
        }
    }

    public void stop() {
        if (mThread != null) {
            mStopped = true;
            mThread.interrupt();
            mThread = null;
        }
    }

    public void offer(String... comics) {
        for (String comicId : comics) {
            if (comicId != null)
                mQueue.offer(comicId);
        }
    }

    public void clear() {
        mQueue.clear();
    }

    public void run() {
        Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
        final ImageUtilities.ExpiringBitmap expiring = new ImageUtilities.ExpiringBitmap();

        while (!mStopped) {
            try {
                final String comicId = mQueue.take();

                final Long lastCheck = sLastChecks.get(comicId);
                if (lastCheck != null && (lastCheck + ONE_DAY) >= System.currentTimeMillis()) {
                    continue;
                }
                sLastChecks.put(comicId, System.currentTimeMillis());

                final ComicsStore.Comic comic = ComicsManager.findComic(mResolver, comicId, null);

                if (comic == null)
                    continue;

                final String imgURL = Preferences.getImageURLForUpdater(comic);

                if (comic.getLastModified() == null || imgURL == null) {
                    continue;
                }

                if (comicCoverUpdated(comic, expiring) && expiring.lastModified != null) {
                    ImageUtilities.deleteCachedCover(comicId);

                    final Bitmap bitmap = Preferences.getBitmapForManager(comic);

                    ImportUtilities.addCoverToCache(comic.getInternalId(), bitmap);

                    if (bitmap != null)
                        bitmap.recycle();

                    mValues.put(BaseItem.LAST_MODIFIED, expiring.lastModified.getTimeInMillis());
                    mArguments[0] = comicId;
                    mResolver.update(ComicsStore.Comic.CONTENT_URI, mValues, mSelection, mArguments);
                }

                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // Ignore
            }
        }
    }

    private boolean comicCoverUpdated(ComicsStore.Comic comic, ImageUtilities.ExpiringBitmap expiring) {
        expiring.lastModified = null;

        final String tinyThumbnail = Preferences.getImageURLForUpdater(comic);

        if (tinyThumbnail != null && !tinyThumbnail.equals("")) {
            HttpGet get = null;
            try {
                get = new HttpGet(Preferences.getImageURLForUpdater(comic));

            } catch (NullPointerException npe) {
                android.util.Log.e(LOG_TAG, "Could not check modification image for " + comic, npe);
            }

            HttpEntity entity = null;
            try {
                final HttpResponse response = HttpManager.execute(get);
                if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    entity = response.getEntity();

                    final Header header = response.getFirstHeader("Last-Modified");
                    if (header != null) {
                        final Calendar calendar = Calendar.getInstance();
                        try {
                            calendar.setTime(mLastModifiedFormat.parse(header.getValue()));
                            expiring.lastModified = calendar;
                            return calendar.after(comic.getLastModified());
                        } catch (ParseException e) {
                            return false;
                        }
                    }
                }
            } catch (IOException e) {
                android.util.Log.e(LOG_TAG, "Could not check modification date for " + comic, e);
            } catch (IllegalArgumentException iae) {
                android.util.Log.e(LOG_TAG, "Null get value for " + comic, iae);
            } finally {
                if (entity != null) {
                    try {
                        entity.consumeContent();
                    } catch (IOException e) {
                        android.util.Log.e(LOG_TAG, "Could not check modification date for " + comic, e);
                    }
                }
            }
        }
        return false;
    }
}