Java tutorial
/* * Copyright 2015, Tanmay Parikh * * 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 com.tanmay.blip.networking; import android.app.IntentService; import android.content.Intent; import android.support.v4.content.LocalBroadcastManager; import com.crashlytics.android.Crashlytics; import com.google.gson.Gson; import com.google.gson.JsonSyntaxException; import com.squareup.okhttp.Request; import com.squareup.okhttp.Response; import com.tanmay.blip.BlipApplication; import com.tanmay.blip.database.DatabaseManager; import com.tanmay.blip.database.SharedPrefs; import com.tanmay.blip.models.Comic; import java.io.IOException; import java.util.List; import java.util.concurrent.CountDownLatch; import java.util.concurrent.Executor; import java.util.concurrent.Executors; public class XKCDDownloader extends IntentService { public static final String LATEST_URL = "http://xkcd.com/info.0.json"; public static final String COMICS_URL = "http://xkcd.com/%d/info.0.json"; public static final String DOWNLOAD_PROGRESS = "com.tanmay.blip.DOWNLOAD_PROGRESS"; public static final String DOWNLOAD_SUCCESS = "com.tanmay.blip.DOWNLOAD_SUCCESS"; public static final String DOWNLOAD_FAIL = "com.tanmay.blip.DOWNLOAD_FAIL"; public static final String DOWNLOAD_TODAY = "com.tanmay.blip.DOWNLOAD_TODAY"; public static final String DOWNLOAD_ALL = "com.tanmay.blip.DOWNLOAD_ALL"; public static final String DOWNLOAD_SPECIFIC = "com.tanmay.blip.DOWNLOAD_SPECIFIC"; public static final String DOWNLOAD_TRANSCRIPT = "com.tanmay.blip.DOWNLOAD_TRANSCRIPT"; public static final String DOWNLOAD_LAST_TEN = "com.tanmay.blip.DOWNLOAD_LAST_TEN"; public static final String COMIC_NUM = "comicNum"; public static final String PROGRESS = "progress"; public static final String TITLE = "title"; public XKCDDownloader() { super("XKCDDownloaderService"); } public XKCDDownloader(String name) { super(name); } @Override protected void onHandleIntent(Intent intent) { switch (intent.getAction()) { case DOWNLOAD_TODAY: downloadToday(); break; case DOWNLOAD_ALL: downloadAll(); break; case DOWNLOAD_SPECIFIC: downloadSpecific(intent.getExtras().getInt(COMIC_NUM)); break; case DOWNLOAD_TRANSCRIPT: downloadAllMissingTranscripts(); break; case DOWNLOAD_LAST_TEN: redownloadLastTen(); } } private void downloadSpecific(int i) { Gson gson = new Gson(); DatabaseManager databaseManager = new DatabaseManager(this); String url = String.format(COMICS_URL, i); Request request = new Request.Builder().url(url).build(); try { Response response = BlipApplication.getInstance().client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException(); Comic comic = gson.fromJson(response.body().string(), Comic.class); databaseManager.addComic(comic); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_SUCCESS)); } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } } private void downloadToday() { DatabaseManager databaseManager = new DatabaseManager(this); Gson gson = new Gson(); Request request = new Request.Builder().url(LATEST_URL).build(); try { Response response = BlipApplication.getInstance().client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException(); Comic comic = gson.fromJson(response.body().string(), Comic.class); if (!databaseManager.comicExists(comic)) databaseManager.addComic(comic); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_SUCCESS)); } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } } private void redownloadLastTen() { final Gson gson = new Gson(); final DatabaseManager databaseManager = new DatabaseManager(this); try { Request todayReq = new Request.Builder().url(LATEST_URL).build(); Response response = BlipApplication.getInstance().client.newCall(todayReq).execute(); if (!response.isSuccessful()) throw new IOException(); Comic comic = gson.fromJson(response.body().string(), Comic.class); final CountDownLatch latch = new CountDownLatch(10); final Executor executor = Executors.newFixedThreadPool(5); int num = comic.getNum(); for (int i = num - 9; i <= num; i++) { final int index = i; executor.execute(new Runnable() { @Override public void run() { try { String url = String.format(COMICS_URL, index); Request request = new Request.Builder().url(url).build(); Response response = BlipApplication.getInstance().client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException(); String responseBody = response.body().string(); Comic comic = null; try { comic = gson.fromJson(responseBody, Comic.class); } catch (JsonSyntaxException e) { Crashlytics.log(1, "XKCDDownloader", e.getMessage() + " POS:" + index); } if (comic != null) { if (databaseManager.comicExists(comic)) { databaseManager.updateComic(comic); } else { databaseManager.addComic(comic); } } } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(XKCDDownloader.this) .sendBroadcast(new Intent(DOWNLOAD_FAIL)); } finally { latch.countDown(); } } }); } try { latch.await(); } catch (InterruptedException e) { LocalBroadcastManager.getInstance(XKCDDownloader.this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } SharedPrefs.getInstance().setLastRedownladTime(System.currentTimeMillis()); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_SUCCESS)); } catch (IOException e) { LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } } private void downloadAllMissingTranscripts() { final Gson gson = new Gson(); final DatabaseManager databaseManager = new DatabaseManager(this); List<Integer> nums = databaseManager.getAllMissingTranscripts(); final CountDownLatch latch = new CountDownLatch(nums.size()); final Executor executor = Executors.newFixedThreadPool(nums.size() / 2); for (int i : nums) { final int index = i; executor.execute(new Runnable() { @Override public void run() { try { String url = String.format(COMICS_URL, index); Request request = new Request.Builder().url(url).build(); Response response = BlipApplication.getInstance().client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException(); String responseBody = response.body().string(); Comic comic = null; try { comic = gson.fromJson(responseBody, Comic.class); } catch (JsonSyntaxException e) { Crashlytics.log(1, "XKCDDownloader", e.getMessage() + " POS:" + index); } if (comic != null) { databaseManager.updateComic(comic); } } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(XKCDDownloader.this) .sendBroadcast(new Intent(DOWNLOAD_FAIL)); } finally { latch.countDown(); } } }); } try { latch.await(); } catch (InterruptedException e) { LocalBroadcastManager.getInstance(XKCDDownloader.this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } SharedPrefs.getInstance().setLastTranscriptCheckTime(System.currentTimeMillis()); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_SUCCESS)); } private void downloadAll() { final Gson gson = new Gson(); final DatabaseManager databaseManager = new DatabaseManager(this); Request request = new Request.Builder().url(LATEST_URL).build(); try { final Response response = BlipApplication.getInstance().client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException(); Comic comic = gson.fromJson(response.body().string(), Comic.class); final int num = comic.getNum(); final CountDownLatch latch = new CountDownLatch(num); final Executor executor = Executors.newFixedThreadPool(10); for (int i = 1; i <= num; i++) { final int index = i; executor.execute(new Runnable() { @Override public void run() { try { if (index != 404) { String url = String.format(COMICS_URL, index); Request newReq = new Request.Builder().url(url).build(); Response newResp = BlipApplication.getInstance().client.newCall(newReq).execute(); if (!newResp.isSuccessful()) throw new IOException(); String resp = newResp.body().string(); Comic comic1 = null; try { comic1 = gson.fromJson(resp, Comic.class); } catch (JsonSyntaxException e) { Crashlytics.log(1, "XKCDDownloader", e.getMessage() + " POS:" + index); } if (comic1 != null) { databaseManager.addComic(comic1); double progress = ((double) databaseManager.getCount() / num) * 100; Intent intent = new Intent(DOWNLOAD_PROGRESS); intent.putExtra(PROGRESS, progress); intent.putExtra(TITLE, comic1.getTitle()); LocalBroadcastManager.getInstance(XKCDDownloader.this).sendBroadcast(intent); } } } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(XKCDDownloader.this) .sendBroadcast(new Intent(DOWNLOAD_FAIL)); } finally { latch.countDown(); } } }); } try { latch.await(); } catch (InterruptedException e) { throw new IOException(e); } LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_SUCCESS)); } catch (IOException e) { e.printStackTrace(); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(DOWNLOAD_FAIL)); } } }