Java tutorial
/* The MIT License (MIT) Copyright (c) 2017 JBug:Brasil <contato@jbugbrasil.com.br> 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 br.com.jbugbrasil.bot.service.jbossbooks; import br.com.jbugbrasil.bot.api.conf.systemproperties.BotProperty; import br.com.jbugbrasil.bot.api.emojis.Emoji; import br.com.jbugbrasil.bot.api.object.Chat; import br.com.jbugbrasil.bot.api.object.Message; import br.com.jbugbrasil.bot.service.cache.qualifier.JBossBooksCache; import br.com.jbugbrasil.bot.service.jbossbooks.pojo.Books; import br.com.jbugbrasil.bot.service.jbossbooks.pojo.JSONResponse; import br.com.jbugbrasil.bot.service.persistence.pojo.AmountOfBooks; import br.com.jbugbrasil.bot.service.persistence.pojo.BookUpdates; import br.com.jbugbrasil.bot.service.persistence.repository.JBossBooksRepository; import br.com.jbugbrasil.bot.telegram.api.message.sender.MessageSender; import com.fasterxml.jackson.databind.ObjectMapper; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.ResponseHandler; import org.apache.http.client.config.CookieSpecs; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import org.infinispan.Cache; import javax.ejb.LocalBean; import javax.ejb.Schedule; import javax.ejb.Stateless; import javax.inject.Inject; import java.io.IOException; import java.lang.invoke.MethodHandles; import java.util.List; import java.util.concurrent.TimeUnit; import java.util.logging.Logger; @Stateless @LocalBean public class JBossBooksService { private final Logger log = Logger.getLogger(MethodHandles.lookup().lookupClass().getName()); private final String GIT_BOOK_ENDPOINT = "https://api.gitbook.com/books"; private final String GIT_BOOKS_PROJECT_HOME = "https://gitbook.com/@jboss-books"; @Inject @BotProperty(name = "br.com.jbugbrasil.bot.gitbook.token", required = true) private String gitBookToken; @Inject @BotProperty(name = "br.com.jbugbrasil.bot.telegram.chatId", required = true) private String chatId; @Inject private JBossBooksRepository repository; @Inject @JBossBooksCache private Cache<String, JSONResponse> cache; @Inject private MessageSender messageSender; private Message message = new Message(); /** * Scheduler default que busca os livros no JBoss Books e salva em cache. */ @Schedule(minute = "0/20", hour = "*", persistent = false) public synchronized void initialize() { if (cache.containsKey("jsonResponse")) { log.fine("Cache populado, retornando"); return; } try { log.fine("Buscando informaes dos livros em [" + GIT_BOOK_ENDPOINT + "]"); HttpGet request = new HttpGet(GIT_BOOK_ENDPOINT); request.setHeader("Authorization", "Bearer " + gitBookToken); ResponseHandler<String> responseHandler = new ResponseHandler<String>() { @Override public String handleResponse(final HttpResponse response) throws IOException { int status = response.getStatusLine().getStatusCode(); if (status >= 200 && status < 300) { HttpEntity entity = response.getEntity(); return entity != null ? EntityUtils.toString(entity) : null; } else { throw new ClientProtocolException("Unexpected response status: " + status); } } }; ObjectMapper mapper = new ObjectMapper(); JSONResponse jsonResponse = mapper.readValue(client().execute(request, responseHandler), JSONResponse.class); cache.put("jsonResponse", jsonResponse, 60, TimeUnit.MINUTES); verifyNewBook(jsonResponse.getTotal()); verifyBookUpdates(jsonResponse); } catch (final Exception e) { e.printStackTrace(); log.warning("Falha ao buscar informaes em [" + GIT_BOOK_ENDPOINT + "]: " + e.getMessage()); } } /** * Retorna a lista de livros * @return {@link JSONResponse} * @throws IOException */ public List<Books> getBooks() throws IOException { initialize(); JSONResponse jsonResponse = cache.get("jsonResponse"); return jsonResponse.getList(); } /** * Verifica se um novo livro foi adicionado no JBoss Books * @param amount - quantidade de livros no JBoss Books */ private void verifyNewBook(int amount) { log.fine("Verificando se um novo livro foi adicionado."); int booksAmount = repository.getAmount(); if (amount > booksAmount) { notify("Um novo livro foi adicionado, clique <a href=\"" + GIT_BOOKS_PROJECT_HOME + "\">aqui</a> para verificar."); repository.persistAmountOfBooks(new AmountOfBooks(amount)); } else if (amount < booksAmount) { log.fine("Livro removido, atualizando db"); repository.persistAmountOfBooks(new AmountOfBooks(amount)); } } /** * Verifica dr algum livro foi atualizado * @param books {@link JSONResponse} */ private void verifyBookUpdates(JSONResponse books) { books.getList().stream().filter(book -> book.isPublic()).forEach(book -> { log.fine("Verificando se o livro " + book.getName() + " foi atualizado"); if (book.getCounts().getUpdates() > repository.getBookUpdates(book.getName())) { repository.bookUpdate(new BookUpdates(book.getName(), book.getCounts().getUpdates())); notify("O seguinte livro foi atualizado: <a href=\"" + book.getUrls().getRead() + "\">" + book.getName() + "</a> " + Emoji.OPEN_BOOK); } }); } /** * Envia mensagens de notificao no grupo que este plugin est ativo * @param msg */ private void notify(String msg) { Chat chat = new Chat(); chat.setId(Long.parseLong(chatId)); message.setChat(chat); message.setText(msg); messageSender.processOutgoingMessage(message); } private CloseableHttpClient client() { RequestConfig config = RequestConfig.custom().setCookieSpec(CookieSpecs.IGNORE_COOKIES).build(); return HttpClients.custom().setDefaultRequestConfig(config).build(); } }