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fcc8414a92
There is a unsolveable race condition between the connection state and sendPacket(), i.e. the connection could go down, right after the method calling sendPacket is called, but before sendPacket() is invoked. Before this change, sendPacket() has thrown an unchecked IllegalStateException, which could be ignored by the Smack user, who would also not notice the race condition. We have decided to throw a checked Exception in this case now, to make the Smack user aware of this situation. SMACK-426
97 lines
3.3 KiB
Java
97 lines
3.3 KiB
Java
/**
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*
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* Copyright 2014 Georg Lukas.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.iqversion;
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import java.util.Collections;
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import java.util.Map;
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import java.util.WeakHashMap;
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import org.jivesoftware.smack.SmackException.NotConnectedException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.Manager;
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import org.jivesoftware.smack.PacketListener;
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import org.jivesoftware.smack.filter.AndFilter;
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import org.jivesoftware.smack.filter.IQTypeFilter;
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import org.jivesoftware.smack.filter.PacketTypeFilter;
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import org.jivesoftware.smack.packet.IQ.Type;
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import org.jivesoftware.smack.packet.Packet;
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import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
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import org.jivesoftware.smackx.iqversion.packet.Version;
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/**
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* A Version Manager that automatically responds to version IQs with a predetermined reply.
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*
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* <p>
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* The VersionManager takes care of handling incoming version request IQs, according to
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* XEP-0092 (Software Version). You can configure the version reply for a given connection
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* by running the following code:
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* </p>
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*
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* <pre>
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* Version MY_VERSION = new Version("My Little XMPP Application", "v1.23", "OS/2 32-bit");
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* VersionManager.getInstanceFor(mConnection).setVersion(MY_VERSION);
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* </pre>
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*
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* @author Georg Lukas
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*/
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public class VersionManager extends Manager {
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private static final Map<XMPPConnection, VersionManager> instances =
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Collections.synchronizedMap(new WeakHashMap<XMPPConnection, VersionManager>());
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private Version own_version;
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private VersionManager(final XMPPConnection connection) {
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super(connection);
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instances.put(connection, this);
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ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
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sdm.addFeature(Version.NAMESPACE);
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connection.addPacketListener(new PacketListener() {
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/**
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* Sends a Version reply on request
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* @throws NotConnectedException
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*/
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public void processPacket(Packet packet) throws NotConnectedException {
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if (own_version == null)
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return;
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Version reply = new Version(own_version);
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reply.setPacketID(packet.getPacketID());
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reply.setTo(packet.getFrom());
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connection().sendPacket(reply);
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}
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}
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, new AndFilter(new PacketTypeFilter(Version.class), new IQTypeFilter(Type.GET)));
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}
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public static synchronized VersionManager getInstanceFor(XMPPConnection connection) {
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VersionManager versionManager = instances.get(connection);
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if (versionManager == null) {
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versionManager = new VersionManager(connection);
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}
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return versionManager;
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}
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public void setVersion(Version v) {
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own_version = v;
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}
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}
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