* * LastActivity (XEP-0012) based on the sending JID's type allows for retrieval * of: *
* *
* XMPPConnection con = new TCPConnection("jabber.org");
* con.login("john", "doe");
* LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org/Smack");
*
*
* To get the lapsed time since the last user logout is the same as above but
* with out the resource:
*
* * LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org"); ** * To get the uptime of a host, you simple send the LastActivity packet to it, * as in the following code example: *
* *
* LastActivity activity = LastActivity.getLastActivity(con, "jabber.org"); ** * @author Gabriel Guardincerri * @see XEP-0012: Last * Activity */ public class LastActivityManager { private long lastMessageSent; private XMPPConnection connection; // Enable the LastActivity support on every established connection static { XMPPConnection.addConnectionCreationListener(new ConnectionCreationListener() { public void connectionCreated(XMPPConnection connection) { new LastActivityManager(connection); } }); } /** * Creates a last activity manager to response last activity requests. * * @param connection * The XMPPConnection that the last activity requests will use. */ private LastActivityManager(XMPPConnection 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(); default: break; } } }, 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 XMPPConnection. * @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(XMPPConnection con, String jid) throws XMPPException { LastActivity activity = new LastActivity(); activity.setTo(jid); LastActivity response = (LastActivity) con.createPacketCollectorAndSend(activity).nextResultOrThrow(); 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(XMPPConnection connection, String jid) { try { DiscoverInfo result = ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid); return result.containsFeature(LastActivity.NAMESPACE); } catch (XMPPException e) { return false; } } }