Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /**
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| 2 | * $RCSfile$
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| 3 | * $Revision$
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| 4 | * $Date$
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| 5 | *
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| 6 | * Copyright 2003-2006 Jive Software.
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| 7 | *
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| 8 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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| 9 | * you may not use this file except in compliance with the License.
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| 10 | * You may obtain a copy of the License at
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| 11 | *
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| 12 | * http://www.apache.org/licenses/LICENSE-2.0
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| 13 | *
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| 14 | * Unless required by applicable law or agreed to in writing, software
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| 15 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 17 | * See the License for the specific language governing permissions and
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| 18 | * limitations under the License.
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| 19 | */
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| 20 |
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| 21 | package org.jivesoftware.smackx;
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| 22 |
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| 23 | import org.jivesoftware.smack.*;
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| 24 | import org.jivesoftware.smack.filter.AndFilter;
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| 25 | import org.jivesoftware.smack.filter.IQTypeFilter;
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| 26 | import org.jivesoftware.smack.filter.PacketIDFilter;
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| 27 | import org.jivesoftware.smack.filter.PacketTypeFilter;
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| 28 | import org.jivesoftware.smack.packet.IQ;
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| 29 | import org.jivesoftware.smack.packet.Message;
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| 30 | import org.jivesoftware.smack.packet.Packet;
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| 31 | import org.jivesoftware.smack.packet.Presence;
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| 32 | import org.jivesoftware.smackx.packet.DiscoverInfo;
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| 33 | import org.jivesoftware.smackx.packet.LastActivity;
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| 34 |
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| 35 | /**
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| 36 | * A last activity manager for handling information about the last activity
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| 37 | * associated with a Jabber ID. A manager handles incoming LastActivity requests
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| 38 | * of existing Connections. It also allows to request last activity information
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| 39 | * of other users.
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| 40 | * <p>
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| 41 | *
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| 42 | * LastActivity (XEP-0012) based on the sending JID's type allows for retrieval
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| 43 | * of:
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| 44 | * <ol>
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| 45 | * <li>How long a particular user has been idle
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| 46 | * <li>How long a particular user has been logged-out and the message the
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| 47 | * specified when doing so.
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| 48 | * <li>How long a host has been up.
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| 49 | * </ol>
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| 50 | * <p/>
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| 51 | *
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| 52 | * For example to get the idle time of a user logged in a resource, simple send
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| 53 | * the LastActivity packet to them, as in the following code:
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| 54 | * <p>
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| 55 | *
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| 56 | * <pre>
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| 57 | * Connection con = new XMPPConnection("jabber.org");
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| 58 | * con.login("john", "doe");
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| 59 | * LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org/Smack");
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| 60 | * </pre>
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| 61 | *
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| 62 | * To get the lapsed time since the last user logout is the same as above but
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| 63 | * with out the resource:
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| 64 | *
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| 65 | * <pre>
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| 66 | * LastActivity activity = LastActivity.getLastActivity(con, "xray@jabber.org");
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| 67 | * </pre>
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| 68 | *
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| 69 | * To get the uptime of a host, you simple send the LastActivity packet to it,
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| 70 | * as in the following code example:
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| 71 | * <p>
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| 72 | *
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| 73 | * <pre>
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| 74 | * LastActivity activity = LastActivity.getLastActivity(con, "jabber.org");
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| 75 | * </pre>
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| 76 | *
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| 77 | * @author Gabriel Guardincerri
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| 78 | * @see <a href="http://xmpp.org/extensions/xep-0012.html">XEP-0012: Last
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| 79 | * Activity</a>
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| 80 | */
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| 81 |
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| 82 | public class LastActivityManager {
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| 83 |
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| 84 | private long lastMessageSent;
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| 85 |
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| 86 | private Connection connection;
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| 87 |
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| 88 | // Enable the LastActivity support on every established connection
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| 89 | static {
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| 90 | Connection.addConnectionCreationListener(new ConnectionCreationListener() {
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| 91 | public void connectionCreated(Connection connection) {
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| 92 | new LastActivityManager(connection);
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| 93 | }
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| 94 | });
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| 95 | }
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| 96 |
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| 97 | /**
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| 98 | * Creates a last activity manager to response last activity requests.
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| 99 | *
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| 100 | * @param connection
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| 101 | * The Connection that the last activity requests will use.
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| 102 | */
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| 103 | private LastActivityManager(Connection connection) {
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| 104 | this.connection = connection;
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| 105 |
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| 106 | // Listen to all the sent messages to reset the idle time on each one
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| 107 | connection.addPacketSendingListener(new PacketListener() {
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| 108 | public void processPacket(Packet packet) {
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| 109 | Presence presence = (Presence) packet;
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| 110 | Presence.Mode mode = presence.getMode();
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| 111 | if (mode == null) return;
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| 112 | switch (mode) {
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| 113 | case available:
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| 114 | case chat:
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| 115 | // We assume that only a switch to available and chat indicates user activity
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| 116 | // since other mode changes could be also a result of some sort of automatism
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| 117 | resetIdleTime();
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| 118 | }
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| 119 | }
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| 120 | }, new PacketTypeFilter(Presence.class));
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| 121 |
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| 122 | connection.addPacketListener(new PacketListener() {
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| 123 | @Override
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| 124 | public void processPacket(Packet packet) {
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| 125 | Message message = (Message) packet;
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| 126 | // if it's not an error message, reset the idle time
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| 127 | if (message.getType() == Message.Type.error) return;
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| 128 | resetIdleTime();
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| 129 | }
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| 130 | }, new PacketTypeFilter(Message.class));
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| 131 |
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| 132 | // Register a listener for a last activity query
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| 133 | connection.addPacketListener(new PacketListener() {
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| 134 |
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| 135 | public void processPacket(Packet packet) {
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| 136 | LastActivity message = new LastActivity();
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| 137 | message.setType(IQ.Type.RESULT);
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| 138 | message.setTo(packet.getFrom());
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| 139 | message.setFrom(packet.getTo());
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| 140 | message.setPacketID(packet.getPacketID());
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| 141 | message.setLastActivity(getIdleTime());
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| 142 |
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| 143 | LastActivityManager.this.connection.sendPacket(message);
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| 144 | }
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| 145 |
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| 146 | }, new AndFilter(new IQTypeFilter(IQ.Type.GET), new PacketTypeFilter(LastActivity.class)));
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| 147 | ServiceDiscoveryManager.getInstanceFor(connection).addFeature(LastActivity.NAMESPACE);
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| 148 | resetIdleTime();
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| 149 | }
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| 150 |
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| 151 | /**
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| 152 | * Resets the idle time to 0, this should be invoked when a new message is
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| 153 | * sent.
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| 154 | */
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| 155 | private void resetIdleTime() {
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| 156 | long now = System.currentTimeMillis();
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| 157 | synchronized (this) {
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| 158 | lastMessageSent = now;
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | /**
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| 163 | * The idle time is the lapsed time between the last message sent and now.
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| 164 | *
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| 165 | * @return the lapsed time between the last message sent and now.
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| 166 | */
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| 167 | private long getIdleTime() {
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| 168 | long lms;
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| 169 | long now = System.currentTimeMillis();
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| 170 | synchronized (this) {
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| 171 | lms = lastMessageSent;
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| 172 | }
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| 173 | return ((now - lms) / 1000);
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| 174 | }
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| 175 |
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| 176 | /**
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| 177 | * Returns the last activity of a particular jid. If the jid is a full JID
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| 178 | * (i.e., a JID of the form of 'user@host/resource') then the last activity
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| 179 | * is the idle time of that connected resource. On the other hand, when the
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| 180 | * jid is a bare JID (e.g. 'user@host') then the last activity is the lapsed
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| 181 | * time since the last logout or 0 if the user is currently logged in.
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| 182 | * Moreover, when the jid is a server or component (e.g., a JID of the form
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| 183 | * 'host') the last activity is the uptime.
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| 184 | *
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| 185 | * @param con
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| 186 | * the current Connection.
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| 187 | * @param jid
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| 188 | * the JID of the user.
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| 189 | * @return the LastActivity packet of the jid.
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| 190 | * @throws XMPPException
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| 191 | * thrown if a server error has occured.
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| 192 | */
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| 193 | public static LastActivity getLastActivity(Connection con, String jid) throws XMPPException {
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| 194 | LastActivity activity = new LastActivity();
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| 195 | activity.setTo(jid);
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| 196 |
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| 197 | PacketCollector collector = con.createPacketCollector(new PacketIDFilter(activity.getPacketID()));
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| 198 | con.sendPacket(activity);
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| 199 |
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| 200 | LastActivity response = (LastActivity) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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| 201 |
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| 202 | // Cancel the collector.
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| 203 | collector.cancel();
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| 204 | if (response == null) {
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| 205 | throw new XMPPException("No response from server on status set.");
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| 206 | }
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| 207 | if (response.getError() != null) {
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| 208 | throw new XMPPException(response.getError());
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| 209 | }
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| 210 | return response;
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| 211 | }
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| 212 |
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| 213 | /**
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| 214 | * Returns true if Last Activity (XEP-0012) is supported by a given JID
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| 215 | *
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| 216 | * @param connection the connection to be used
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| 217 | * @param jid a JID to be tested for Last Activity support
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| 218 | * @return true if Last Activity is supported, otherwise false
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| 219 | */
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| 220 | public static boolean isLastActivitySupported(Connection connection, String jid) {
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| 221 | try {
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| 222 | DiscoverInfo result =
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| 223 | ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid);
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| 224 | return result.containsFeature(LastActivity.NAMESPACE);
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| 225 | }
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| 226 | catch (XMPPException e) {
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| 227 | return false;
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| 228 | }
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| 229 | }
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| 230 | }
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