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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
114 lines
4.1 KiB
Java
114 lines
4.1 KiB
Java
/**
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*
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* Copyright 2014 Florian Schmaus
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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.time;
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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.NoResponseException;
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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.ConnectionCreationListener;
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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.XMPPException.XMPPErrorException;
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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.PacketFilter;
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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.time.packet.Time;
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public class EntityTimeManager extends Manager {
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private static final Map<XMPPConnection, EntityTimeManager> INSTANCES = new WeakHashMap<XMPPConnection, EntityTimeManager>();
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private static final PacketFilter TIME_PACKET_FILTER = new AndFilter(new PacketTypeFilter(
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Time.class), new IQTypeFilter(Type.GET));
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private static boolean autoEnable = true;
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static {
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XMPPConnection.addConnectionCreationListener(new ConnectionCreationListener() {
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public void connectionCreated(XMPPConnection connection) {
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getInstanceFor(connection);
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}
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});
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}
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public static void setAutoEnable(boolean autoEnable) {
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EntityTimeManager.autoEnable = autoEnable;
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}
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public synchronized static EntityTimeManager getInstanceFor(XMPPConnection connection) {
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EntityTimeManager entityTimeManager = INSTANCES.get(connection);
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if (entityTimeManager == null) {
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entityTimeManager = new EntityTimeManager(connection);
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}
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return entityTimeManager;
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}
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private boolean enabled = false;
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private EntityTimeManager(XMPPConnection connection) {
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super(connection);
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INSTANCES.put(connection, this);
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if (autoEnable)
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enable();
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connection.addPacketListener(new PacketListener() {
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@Override
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public void processPacket(Packet packet) throws NotConnectedException {
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if (!enabled)
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return;
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connection().sendPacket(Time.createResponse(packet));
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}
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}, TIME_PACKET_FILTER);
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}
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public synchronized void enable() {
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if (enabled)
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return;
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ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection());
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sdm.addFeature(Time.NAMESPACE);
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enabled = true;
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}
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public synchronized void disable() {
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if (!enabled)
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return;
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ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection());
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sdm.removeFeature(Time.NAMESPACE);
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enabled = false;
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}
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public boolean isTimeSupported(String jid) throws NoResponseException, XMPPErrorException, NotConnectedException {
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return ServiceDiscoveryManager.getInstanceFor(connection()).supportsFeature(jid, Time.NAMESPACE);
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}
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public Time getTime(String jid) throws NoResponseException, XMPPErrorException, NotConnectedException {
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if (!isTimeSupported(jid))
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return null;
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Time request = new Time();
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Time response = (Time) connection().createPacketCollectorAndSend(request).nextResultOrThrow();
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return response;
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}
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}
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