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161 lines
5.0 KiB
161 lines
5.0 KiB
/*
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This file is part of Libresonic.
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Libresonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Libresonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Libresonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2016 (C) Libresonic Authors
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Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
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*/
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package org.libresonic.player.ajax;
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import org.apache.commons.lang.StringUtils;
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import org.directwebremoting.WebContext;
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import org.directwebremoting.WebContextFactory;
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import org.libresonic.player.Logger;
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import org.libresonic.player.service.SecurityService;
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import org.libresonic.player.util.BoundedList;
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import javax.servlet.http.HttpServletRequest;
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import java.io.Serializable;
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import java.util.*;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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/**
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* Provides AJAX-enabled services for the chatting.
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* This class is used by the DWR framework (http://getahead.ltd.uk/dwr/).
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*
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* @author Sindre Mehus
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*/
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public class ChatService {
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private static final Logger LOG = Logger.getLogger(ChatService.class);
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private static final String CACHE_KEY = "1";
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private static final int MAX_MESSAGES = 10;
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private static final long TTL_MILLIS = 3L * 24L * 60L * 60L * 1000L; // 3 days.
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private final LinkedList<Message> messages = new BoundedList<Message>(MAX_MESSAGES);
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private SecurityService securityService;
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private long revision = System.identityHashCode(this);
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/**
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* Invoked by Spring.
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*/
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public void init() {
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// Delete old messages every hour.
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ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
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Runnable runnable = new Runnable() {
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public void run() {
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removeOldMessages();
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}
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};
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executor.scheduleWithFixedDelay(runnable, 0L, 3600L, TimeUnit.SECONDS);
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}
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private synchronized void removeOldMessages() {
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long now = System.currentTimeMillis();
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for (Iterator<Message> iterator = messages.iterator(); iterator.hasNext();) {
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Message message = iterator.next();
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if (now - message.getDate().getTime() > TTL_MILLIS) {
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iterator.remove();
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revision++;
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}
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}
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}
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public synchronized void addMessage(String message) {
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WebContext webContext = WebContextFactory.get();
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doAddMessage(message, webContext.getHttpServletRequest());
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}
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public synchronized void doAddMessage(String message, HttpServletRequest request) {
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String user = securityService.getCurrentUsername(request);
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message = StringUtils.trimToNull(message);
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if (message != null && user != null) {
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messages.addFirst(new Message(message, user, new Date()));
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revision++;
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}
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}
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public synchronized void clearMessages() {
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messages.clear();
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revision++;
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}
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/**
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* Returns all messages, but only if the given revision is different from the
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* current revision.
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*/
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public synchronized Messages getMessages(long revision) {
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if (this.revision != revision) {
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return new Messages(new ArrayList<Message>(messages), this.revision);
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}
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return null;
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}
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public void setSecurityService(SecurityService securityService) {
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this.securityService = securityService;
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}
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public static class Messages implements Serializable {
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private static final long serialVersionUID = -752602719879818165L;
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private final List<Message> messages;
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private final long revision;
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public Messages(List<Message> messages, long revision) {
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this.messages = messages;
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this.revision = revision;
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}
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public List<Message> getMessages() {
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return messages;
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}
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public long getRevision() {
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return revision;
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}
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}
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public static class Message implements Serializable {
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private static final long serialVersionUID = -1907101191518133712L;
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private final String content;
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private final String username;
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private final Date date;
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public Message(String content, String username, Date date) {
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this.content = content;
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this.username = username;
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this.date = date;
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}
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public String getContent() {
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return content;
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}
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public String getUsername() {
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return username;
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}
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public Date getDate() {
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return date;
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}
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}
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}
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