de.dev.eth0.rssreader.app.http.HttpLoaderImpl.java Source code

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Here is the source code for de.dev.eth0.rssreader.app.http.HttpLoaderImpl.java

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/* ===================================================
 * Copyright 2015 Alex Muthmann
 *
 * 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 de.dev.eth0.rssreader.app.http;

import android.content.Context;
import com.squareup.okhttp.Cache;
import com.squareup.okhttp.CacheControl;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.picasso.OkHttpDownloader;
import com.squareup.picasso.Picasso;
import de.dev.eth0.rssreader.BuildConfig;
import de.dev.eth0.rssreader.app.http.callback.FeedLoaderCallbackImpl;
import de.dev.eth0.rssreader.app.util.PreferenceHelper;
import de.dev.eth0.rssreader.core.http.HttpLoader;
import de.dev.eth0.rssreader.core.http.callback.FeedLoaderCallback;
import de.dev.eth0.rssreader.core.http.callback.PrecacheCallback;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import timber.log.Timber;

/**
 *
 */
public class HttpLoaderImpl implements HttpLoader {

    private final OkHttpClient client;
    private final Context context;

    private static HttpLoaderImpl instance;
    private static Picasso picasso;

    /**
     *
     * @param context
     * @return instance of Feedloader (singleton)
     */
    public static HttpLoaderImpl getInstance(Context context) {
        if (instance == null) {
            Timber.d("Building new instance");
            instance = new HttpLoaderImpl(context);
        }
        return instance;
    }

    private HttpLoaderImpl(Context context) {
        this.client = new OkHttpClient();
        this.context = context;
        Cache cache = getCache(context);
        if (cache != null) {
            Timber.d("Setting cache");
            client.setCache(cache);
        }
    }

    /**
     * Call this to reset the cache-size
     *
     * @param context
     */
    public static void updateCacheSize(Context context) {
        try {
            HttpLoaderImpl fl = getInstance(context);
            Cache cache = fl.client.getCache();
            if (cache != null) {
                cache.flush();
                cache.close();
                cache.delete();
            }
            fl.client.setCache(getCache(context));
        } catch (IOException ex) {
            Timber.w(ex, "Could not update Cachesize");
        }
    }

    /**
     * Builds a cache as configured in preferences
     *
     * @param ctx
     * @return
     */
    private static Cache getCache(Context ctx) {
        int cacheSize = PreferenceHelper.getCacheSize(ctx);
        Timber.d("Setting cachesize to %d MB", cacheSize);
        if (cacheSize > 0) {
            File cacheDir = ctx.getDir("http_cache", Context.MODE_PRIVATE);
            Timber.d("Using cachedir %s", cacheDir.getPath());
            return new Cache(cacheDir, cacheSize * 1024 * 1024);
        }
        Timber.d("No cache configured");
        return null;
    }

    /**
     *
     * @param ctx
     */
    public void loadFeedSummary(Context ctx) {
        loadFeedSummary(new FeedLoaderCallbackImpl(ctx));
    }

    /**
     *
     * @param callback
     */
    public void loadFeedSummary(FeedLoaderCallback callback) {
        Request request = new Request.Builder()
                .cacheControl(new CacheControl.Builder().maxAge(0, TimeUnit.SECONDS).build())
                .url(BuildConfig.FEED_URL).build();
        client.newCall(request).enqueue(callback);
    }

    @Override
    public Response loadUrl(String url) throws IOException {
        Request request = new Request.Builder().url(url).build();
        return client.newCall(request).execute();
    }

    @Override
    public void precacheUrl(String url) {
        Request request = new Request.Builder().url(url).build();
        client.newCall(request).enqueue(new PrecacheCallback());
    }

    @Override
    public Picasso getPicasso() {
        if (picasso == null) {
            picasso = new Picasso.Builder(context).downloader(new OkHttpDownloader(client)).build();
            picasso.setLoggingEnabled(BuildConfig.DEBUG);
            picasso.setIndicatorsEnabled(BuildConfig.DEBUG);
        }
        return picasso;
    }

}