Java tutorial
/* * This file is part of anycook. The new internet cookbook * Copyright (C) 2014 Jan Graegger * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see [http://www.gnu.org/licenses/]. */ package de.anycook.api; import de.anycook.api.providers.MessageNumberProvider; import de.anycook.api.providers.MessageProvider; import de.anycook.api.providers.MessageSessionProvider; import de.anycook.api.util.MediaType; import de.anycook.db.mysql.DBMessage; import de.anycook.messages.Message; import de.anycook.messages.MessageSession; import de.anycook.session.Session; import de.anycook.user.User; import org.apache.commons.lang3.StringUtils; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import java.sql.SQLException; import java.util.Date; import java.util.List; import java.util.concurrent.TimeUnit; import javax.ws.rs.Consumes; import javax.ws.rs.GET; import javax.ws.rs.POST; import javax.ws.rs.PUT; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.QueryParam; import javax.ws.rs.WebApplicationException; import javax.ws.rs.container.AsyncResponse; import javax.ws.rs.container.Suspended; import javax.ws.rs.core.Context; import javax.ws.rs.core.GenericEntity; import javax.ws.rs.core.Response; @Path("/message") public class MessageApi { private final Logger logger; @Context private Session session; /** * */ public MessageApi() { logger = LogManager.getLogger(getClass()); } @GET @Produces(MediaType.APPLICATION_JSON) public void get(@Suspended final AsyncResponse asyncResponse, @QueryParam("lastChange") Long lastChange) { asyncResponse.setTimeoutHandler(asyncResponse1 -> asyncResponse1.resume(Response.ok().build())); asyncResponse.setTimeout(5, TimeUnit.MINUTES); User user = session.getUser(); if (lastChange == null) { try { List<MessageSession> sessions = MessageSession.getSessionsFromUser(user.getId()); GenericEntity<List<MessageSession>> entity = new GenericEntity<List<MessageSession>>(sessions) { }; asyncResponse.resume(entity); } catch (SQLException e) { logger.error(e, e); asyncResponse.resume(new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR)); } return; } Date changeDate = new Date(lastChange); try { List<MessageSession> sessions = MessageSession.getSessionsFromUser(user.getId(), changeDate); GenericEntity<List<MessageSession>> entity = new GenericEntity<List<MessageSession>>(sessions) { }; if (!sessions.isEmpty()) { asyncResponse.resume(entity); } else { MessageSessionProvider.INSTANCE.suspend(user.getId(), asyncResponse); } } catch (SQLException | DBMessage.SessionNotFoundException e) { logger.error(e, e); asyncResponse.resume(new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR)); } } @POST @Consumes(MediaType.APPLICATION_JSON) public void newMessage(NewMessage message) { if (message == null) { throw new WebApplicationException(Response.Status.BAD_REQUEST); } try { int userId = session.getUser().getId(); message.recipients.add(userId); MessageSession.getSession(message.recipients).newMessage(userId, message.text); } catch (SQLException | DBMessage.SessionNotFoundException e) { logger.error(e, e); throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR); } } @GET @Path("number") @Produces(MediaType.APPLICATION_JSON) public void getMessageNumber(@Suspended AsyncResponse asyncResponse, @QueryParam("lastNum") int lastNumber) { try { int userId = session.getUser().getId(); int newMessageNum = MessageSession.getNewMessageNum(userId); if (newMessageNum == lastNumber) { MessageNumberProvider.INSTANCE.suspend(userId, asyncResponse); } else { logger.info("return message num"); asyncResponse.resume(newMessageNum); } } catch (SQLException e) { logger.error(e, e); asyncResponse.resume(new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR)); } } @GET @Path("{sessionId}") @Produces(MediaType.APPLICATION_JSON) public void getMessagesFromSession(@Suspended AsyncResponse asyncResponse, @PathParam("sessionId") int sessionId, @QueryParam("lastId") Integer lastId) { int userId = session.getUser().getId(); try { if (lastId == null) { asyncResponse.resume(MessageSession.getSession(sessionId, userId)); return; } MessageSession messageSession = MessageSession.getSession(sessionId, userId, lastId); if (!messageSession.isEmpty()) { asyncResponse.resume(messageSession); } else { MessageProvider.INSTANCE.suspend(sessionId, userId, asyncResponse); } } catch (SQLException e) { logger.error(e, e); asyncResponse.resume(new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR)); } catch (DBMessage.SessionNotFoundException e) { logger.warn(e, e); asyncResponse.resume(new WebApplicationException(Response.Status.BAD_REQUEST)); } } @POST @Path("{sessionId}") @Consumes(MediaType.APPLICATION_JSON) public void answerSession(@PathParam("sessionId") int sessionId, String message) { if (message == null) { logger.info("text was null"); throw new WebApplicationException(400); } try { int userId = session.getUser().getId(); MessageSession.getSession(sessionId, userId).newMessage(userId, message); } catch (SQLException | DBMessage.SessionNotFoundException e) { logger.error(e); throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR); } } @PUT @Path("{sessionId}/{messageId}") @Consumes(MediaType.APPLICATION_FORM_URLENCODED) public void readMessage(@PathParam("sessionId") int sessionId, @PathParam("messageId") int messageId) { try { int userId = session.getUser().getId(); Message.read(sessionId, messageId, userId); MessageNumberProvider.INSTANCE.wakeUpSuspended(userId); } catch (SQLException e) { logger.error(e); throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR); } } public static class NewMessage { public List<Integer> recipients; public String text; @Override public String toString() { return String.format("{recipients : %s, text : %s}", StringUtils.join(recipients, ","), text); } } }