/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2006 Jive Software.
*
* All rights reserved. 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 org.jivesoftware.smackx;
import org.jivesoftware.smack.*;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.IQTypeFilter;
import org.jivesoftware.smack.filter.PacketIDFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smackx.packet.DiscoverInfo;
import org.jivesoftware.smackx.packet.LastActivity;
/**
* A last activity manager for handling information about the last activity
* associated with a Jabber ID. A manager handles incoming LastActivity requests
* of existing Connections. It also allows to request last activity information
* of other users.
* <p>
*
* LastActivity (XEP-0012) based on the sending JID's type allows for retrieval
* of:
* <ol>
* <li>How long a particular user has been idle
* <li>How long a particular user has been logged-out and the message the
* specified when doing so.
* <li>How long a host has been up.
* </ol>
* <p/>
*
* For example to get the idle time of a user logged in a resource, simple send
* the LastActivity packet to them, as in the following code:
* <p>
*
* <pre>
* Connection con = new XMPPConnection("jabber.org");
* con.login("john", "doe");
* LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org/Smack");
* </pre>
*
* To get the lapsed time since the last user logout is the same as above but
* with out the resource:
*
* <pre>
* LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org");
* </pre>
*
* To get the uptime of a host, you simple send the LastActivity packet to it,
* as in the following code example:
* <p>
*
* <pre>
* LastActivity activity = LastActivity.getLastActivity(con, "jabber.org");
* </pre>
*
* @author Gabriel Guardincerri
* @see <a href="http://xmpp.org/extensions/xep-0012.html">XEP-0012: Last
* Activity</a>
*/
public class LastActivityManager {
private long lastMessageSent;
private Connection connection;
// Enable the LastActivity support on every established connection
static {
Connection.addConnectionCreationListener(new ConnectionCreationListener() {
public void connectionCreated(Connection connection) {
new LastActivityManager(connection);
}
});
}
/**
* Creates a last activity manager to response last activity requests.
*
* @param connection
* The Connection that the last activity requests will use.
*/
private LastActivityManager(Connection connection) {
this.connection = connection;
// Listen to all the sent messages to reset the idle time on each one
connection.addPacketSendingListener(new PacketListener() {
public void processPacket(Packet packet) {
Presence presence = (Presence) packet;
Presence.Mode mode = presence.getMode();
if (mode == null) return;
switch (mode) {
case available:
case chat:
// We assume that only a switch to available and chat indicates user activity
// since other mode changes could be also a result of some sort of automatism
resetIdleTime();
}
}
}, new PacketTypeFilter(Presence.class));
connection.addPacketListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
Message message = (Message) packet;
// if it's not an error message, reset the idle time
if (message.getType() == Message.Type.error) return;
resetIdleTime();
}
}, new PacketTypeFilter(Message.class));
// Register a listener for a last activity query
connection.addPacketListener(new PacketListener() {
public void processPacket(Packet packet) {
LastActivity message = new LastActivity();
message.setType(IQ.Type.RESULT);
message.setTo(packet.getFrom());
message.setFrom(packet.getTo());
message.setPacketID(packet.getPacketID());
message.setLastActivity(getIdleTime());
LastActivityManager.this.connection.sendPacket(message);
}
}, new AndFilter(new IQTypeFilter(IQ.Type.GET), new PacketTypeFilter(LastActivity.class)));
ServiceDiscoveryManager.getInstanceFor(connection).addFeature(LastActivity.NAMESPACE);
resetIdleTime();
}
/**
* Resets the idle time to 0, this should be invoked when a new message is
* sent.
*/
private void resetIdleTime() {
long now = System.currentTimeMillis();
synchronized (this) {
lastMessageSent = now;
}
}
/**
* The idle time is the lapsed time between the last message sent and now.
*
* @return the lapsed time between the last message sent and now.
*/
private long getIdleTime() {
long lms;
long now = System.currentTimeMillis();
synchronized (this) {
lms = lastMessageSent;
}
return ((now - lms) / 1000);
}
/**
* Returns the last activity of a particular jid. If the jid is a full JID
* (i.e., a JID of the form of 'user@host/resource') then the last activity
* is the idle time of that connected resource. On the other hand, when the
* jid is a bare JID (e.g. 'user@host') then the last activity is the lapsed
* time since the last logout or 0 if the user is currently logged in.
* Moreover, when the jid is a server or component (e.g., a JID of the form
* 'host') the last activity is the uptime.
*
* @param con
* the current Connection.
* @param jid
* the JID of the user.
* @return the LastActivity packet of the jid.
* @throws XMPPException
* thrown if a server error has occured.
*/
public static LastActivity getLastActivity(Connection con, String jid) throws XMPPException {
LastActivity activity = new LastActivity();
activity.setTo(jid);
PacketCollector collector = con.createPacketCollector(new PacketIDFilter(activity.getPacketID()));
con.sendPacket(activity);
LastActivity response = (LastActivity) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
// Cancel the collector.
collector.cancel();
if (response == null) {
throw new XMPPException("No response from server on status set.");
}
if (response.getError() != null) {
throw new XMPPException(response.getError());
}
return response;
}
/**
* Returns true if Last Activity (XEP-0012) is supported by a given JID
*
* @param connection the connection to be used
* @param jid a JID to be tested for Last Activity support
* @return true if Last Activity is supported, otherwise false
*/
public static boolean isLastActivitySupported(Connection connection, String jid) {
try {
DiscoverInfo result =
ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid);
return result.containsFeature(LastActivity.NAMESPACE);
}
catch (XMPPException e) {
return false;
}
}
}