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Code Issues Releases Wiki Activity

Reworked (send|recv)Listeners, ListenerWrapper

Browse source 
instead of rely on ListenerWrapper checking the PacketFilter *and*
invoking the PacketListener we now use two for-each loops, where the
first filters the PacketListeners that should get invoked and use the
second for-each loop to actually invoke the PacketListener.

Before, the code was not thread safe if a PacketListener would remove
itself from the (send|recv)Listeners.

Also make packet(Listener|Filter) in ListenerWrapper final.
This commit is contained in:
Florian Schmaus 2014-10-10 00:36:58 +02:00
parent 03686fbaaf
commit 15d59299a2
2 changed files with 61 additions and 54 deletions
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93
smack-core/src/main/java/org/jivesoftware/smack/AbstractXMPPConnection.java
View file

@ -21,11 +21,12 @@ import java.io.Reader;
import java.io.Writer;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
@ -107,14 +108,14 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
/**
* List of PacketListeners that will be notified when a new packet was received.
*/
protected final Map<PacketListener, ListenerWrapper> recvListeners =
new ConcurrentHashMap<PacketListener, ListenerWrapper>();
private final Map<PacketListener, ListenerWrapper> recvListeners =
new HashMap<PacketListener, ListenerWrapper>();
/**
* List of PacketListeners that will be notified when a new packet was sent.
*/
protected final Map<PacketListener, ListenerWrapper> sendListeners =
new ConcurrentHashMap<PacketListener, ListenerWrapper>();
private final Map<PacketListener, ListenerWrapper> sendListeners =
new HashMap<PacketListener, ListenerWrapper>();
/**
* List of PacketInterceptors that will be notified when a new packet is about to be
@ -672,13 +673,17 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
throw new NullPointerException("Packet listener is null.");
}
ListenerWrapper wrapper = new ListenerWrapper(packetListener, packetFilter);
synchronized (recvListeners) {
recvListeners.put(packetListener, wrapper);
}
}
@Override
public boolean removePacketListener(PacketListener packetListener) {
synchronized (recvListeners) {
return recvListeners.remove(packetListener) != null;
}
}
@Override
public void addPacketSendingListener(PacketListener packetListener, PacketFilter packetFilter) {
@ -686,34 +691,35 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
throw new NullPointerException("Packet listener is null.");
}
ListenerWrapper wrapper = new ListenerWrapper(packetListener, packetFilter);
synchronized (sendListeners) {
sendListeners.put(packetListener, wrapper);
}
}
@Override
public void removePacketSendingListener(PacketListener packetListener) {
synchronized (sendListeners) {
sendListeners.remove(packetListener);
}
/**
* Get a map of all packet listeners for sending packets of this connection.
*
* @return a map of all packet listeners for sent packets.
*/
protected Map<PacketListener, ListenerWrapper> getPacketSendingListeners() {
return sendListeners;
}
/**
* Process all packet listeners for sending packets.
*
* @param packet the packet to process.
*/
private void firePacketSendingListeners(Packet packet) {
// Notify the listeners of the new sent packet
List<PacketListener> listenersToNotify = new LinkedList<PacketListener>();
synchronized (sendListeners) {
for (ListenerWrapper listenerWrapper : sendListeners.values()) {
if (listenerWrapper.filterMatches(packet)) {
listenersToNotify.add(listenerWrapper.getListener());
}
}
}
for (PacketListener listener : listenersToNotify) {
try {
listenerWrapper.notifyListener(packet);
listener.processPacket(packet);
}
catch (NotConnectedException e) {
LOGGER.log(Level.WARNING, "Got not connected exception, aborting");
@ -819,21 +825,19 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
executorService.submit(new ListenerNotification(packet));
}
/**
* A runnable to notify all listeners of a packet.
*/
private class ListenerNotification implements Runnable {
private Packet packet;
public ListenerNotification(Packet packet) {
this.packet = packet;
protected void notifiyReceivedListeners(Packet packet) {
List<PacketListener> listenersToNotify = new LinkedList<PacketListener>();
synchronized (recvListeners) {
for (ListenerWrapper listenerWrapper : recvListeners.values()) {
if (listenerWrapper.filterMatches(packet)) {
listenersToNotify.add(listenerWrapper.getListener());
}
}
}
public void run() {
for (ListenerWrapper listenerWrapper : recvListeners.values()) {
for (PacketListener listener : listenersToNotify) {
try {
listenerWrapper.notifyListener(packet);
listener.processPacket(packet);
} catch(NotConnectedException e) {
LOGGER.log(Level.WARNING, "Got not connected exception, aborting", e);
break;
@ -842,6 +846,21 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
}
}
}
/**
* A runnable to notify all listeners of a packet.
*/
private class ListenerNotification implements Runnable {
private final Packet packet;
public ListenerNotification(Packet packet) {
this.packet = packet;
}
public void run() {
notifiyReceivedListeners(packet);
}
}
/**
@ -901,8 +920,8 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
*/
protected static class ListenerWrapper {
private PacketListener packetListener;
private PacketFilter packetFilter;
private final PacketListener packetListener;
private final PacketFilter packetFilter;
/**
* Create a class which associates a packet filter with a listener.
@ -915,16 +934,12 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
this.packetFilter = packetFilter;
}
/**
* Notify and process the packet listener if the filter matches the packet.
*
* @param packet the packet which was sent or received.
* @throws NotConnectedException
*/
public void notifyListener(Packet packet) throws NotConnectedException {
if (packetFilter == null || packetFilter.accept(packet)) {
packetListener.processPacket(packet);
public boolean filterMatches(Packet packet) {
return packetFilter == null || packetFilter.accept(packet);
}
public PacketListener getListener() {
return packetListener;
}
}

10
smack-core/src/test/java/org/jivesoftware/smack/DummyConnection.java
View file

@ -23,7 +23,6 @@ import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.packet.Element;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PlainStreamElement;
@ -251,13 +250,6 @@ public class DummyConnection extends AbstractXMPPConnection {
}
// Deliver the incoming packet to listeners.
for (ListenerWrapper listenerWrapper : recvListeners.values()) {
try {
listenerWrapper.notifyListener(packet);
}
catch (NotConnectedException e) {
e.printStackTrace();
}
}
notifiyReceivedListeners(packet);
}
}