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Code Issues Releases Wiki Activity

Reuse empty slots in the collection to store new listeners/collectors. Fixed by Alex. :) SMACK-149

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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@4340 b35dd754-fafc-0310-a699-88a17e54d16e
This commit is contained in:
Gaston Dombiak 2006-07-10 16:51:56 +00:00 committed by gato
parent 97b80ac8da
commit f9ecbb3297
2 changed files with 119 additions and 59 deletions
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14
source/org/jivesoftware/smack/PacketCollector.java
View file

@ -20,8 +20,8 @@
package org.jivesoftware.smack;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.packet.Packet;
import java.util.LinkedList;
@ -63,10 +63,6 @@ public class PacketCollector {
this.packetReader = packetReader;
this.packetFilter = packetFilter;
this.resultQueue = new LinkedList();
// Add the collector to the packet reader's list of active collector.
synchronized (packetReader.collectors) {
packetReader.collectors.add(this);
}
}
/**
@ -78,13 +74,7 @@ public class PacketCollector {
// If the packet collector has already been cancelled, do nothing.
if (!cancelled) {
cancelled = true;
// Remove object from collectors list by setting the value in the
// list at the correct index to null. The collector thread will
// automatically remove the actual list entry when it can.
synchronized (packetReader.collectors) {
int index = packetReader.collectors.indexOf(this);
packetReader.collectors.set(index, null);
}
packetReader.cancelPacketCollector(this);
}
}

160
source/org/jivesoftware/smack/PacketReader.java
View file

@ -42,18 +42,18 @@ import java.util.*;
*/
class PacketReader {
private Thread readerThread;
private Thread listenerThread;
private final Thread readerThread;
private final Thread listenerThread;
private XMPPConnection connection;
private XmlPullParser parser;
private boolean done = false;
protected List collectors = new ArrayList();
private List listeners = new ArrayList();
protected List connectionListeners = new ArrayList();
private final VolatileMemberCollection collectors = new VolatileMemberCollection(50);
private final VolatileMemberCollection listeners = new VolatileMemberCollection(50);
protected final List connectionListeners = new ArrayList();
private String connectionID = null;
private Object connectionIDLock = new Object();
private final Object connectionIDLock = new Object();
protected PacketReader(XMPPConnection connection) {
this.connection = connection;
@ -90,7 +90,14 @@ class PacketReader {
* @return a new packet collector.
*/
public PacketCollector createPacketCollector(PacketFilter packetFilter) {
return new PacketCollector(this, packetFilter);
PacketCollector collector = new PacketCollector(this, packetFilter);
collectors.add(collector);
// Add the collector to the list of active collector.
return collector;
}
protected void cancelPacketCollector(PacketCollector packetCollector) {
collectors.remove(packetCollector);
}
/**
@ -114,14 +121,7 @@ class PacketReader {
* @param packetListener the packet listener to remove.
*/
public void removePacketListener(PacketListener packetListener) {
synchronized (listeners) {
for (int i=0; i<listeners.size(); i++) {
ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
if (wrapper != null && wrapper.packetListener.equals(packetListener)) {
listeners.set(i, null);
}
}
}
listeners.remove(packetListener);
}
/**
@ -243,23 +243,12 @@ class PacketReader {
*/
private void processListeners() {
while (!done) {
synchronized (listeners) {
if (listeners.size() > 0) {
for (int i=listeners.size()-1; i>=0; i--) {
if (listeners.get(i) == null) {
listeners.remove(i);
}
}
}
}
boolean processedPacket = false;
int size = listeners.size();
for (int i=0; i<size; i++) {
ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
if (wrapper != null) {
Iterator it = listeners.getIterator();
while (it.hasNext()) {
ListenerWrapper wrapper = (ListenerWrapper) it.next();
processedPacket = processedPacket || wrapper.notifyListener();
}
}
if (!processedPacket) {
try {
// Wait until more packets are ready to be processed.
@ -418,24 +407,12 @@ class PacketReader {
return;
}
// Remove all null values from the collectors list.
synchronized (collectors) {
for (int i=collectors.size()-1; i>=0; i--) {
if (collectors.get(i) == null) {
collectors.remove(i);
}
}
}
// Loop through all collectors and notify the appropriate ones.
int size = collectors.size();
for (int i=0; i<size; i++) {
PacketCollector collector = (PacketCollector)collectors.get(i);
if (collector != null) {
// Have the collector process the packet to see if it wants to handle it.
Iterator it = collectors.getIterator();
while (it.hasNext()) {
PacketCollector collector = (PacketCollector) it.next();
collector.processPacket(packet);
}
}
// Notify the listener thread that packets are waiting.
synchronized (listenerThread) {
@ -788,6 +765,99 @@ class PacketReader {
return bind;
}
/**
* When an object is added it the first attempt is to add it to a 'null' space and when it is
* removed it is not removed from the list but instead the position is nulled so as not to
* interfere with list iteration as the Collection memebres are thought to be extermely
* volatile. In other words, many are added and deleted and 'null' values are skipped by the
* returned iterator.
*/
static class VolatileMemberCollection {
private final Object mutex = new Object();
private final ArrayList collectors;
private int nullIndex = -1;
private int[] nullArray;
VolatileMemberCollection(int initialCapacity) {
collectors = new ArrayList(initialCapacity);
nullArray = new int[initialCapacity];
}
public void add(Object member) {
synchronized (mutex) {
if (nullIndex < 0) {
ensureCapacity();
collectors.add(member);
}
else {
collectors.set(nullArray[nullIndex--], member);
}
}
}
private void ensureCapacity() {
int current = nullArray.length;
if (collectors.size() + 1 >= current) {
int newCapacity = current * 2;
int oldData[] = nullArray;
collectors.ensureCapacity(newCapacity);
nullArray = new int[newCapacity];
System.arraycopy(oldData, 0, nullArray, 0, nullIndex + 1);
}
}
public void remove(Object member) {
synchronized (mutex) {
int index = collectors.lastIndexOf(member);
if (index >= 0) {
collectors.set(index, null);
nullArray[++nullIndex] = index;
}
}
}
/**
* One thread should be using an iterator at a time.
*
* @return Iterator over PacketCollector.
*/
public Iterator getIterator() {
return new Iterator() {
private int index = 0;
private Object next;
private int size = collectors.size();
public void remove() {
}
public boolean hasNext() {
return next != null || grabNext() != null;
}
private Object grabNext() {
Object next;
while (index < size) {
next = collectors.get(index++);
if (next != null) {
this.next = next;
return next;
}
}
this.next = null;
return null;
}
public Object next() {
Object toReturn = (this.next != null ? this.next : grabNext());
this.next = null;
return toReturn;
}
};
}
}
/**
* A wrapper class to associate a packet collector with a listener.
*/
@ -800,7 +870,7 @@ class PacketReader {
PacketFilter packetFilter)
{
this.packetListener = packetListener;
this.packetCollector = new PacketCollector(packetReader, packetFilter);
this.packetCollector = packetReader.createPacketCollector(packetFilter);
}
public boolean equals(Object object) {