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https://codeberg.org/Mercury-IM/Smack
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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@4537 b35dd754-fafc-0310-a699-88a17e54d16e
136 lines
4.2 KiB
Java
136 lines
4.2 KiB
Java
/**
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* $RCSfile$
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* $Revision: 2779 $
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* $Date: 2005-09-05 17:00:45 -0300 (Mon, 05 Sep 2005) $
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*
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* Copyright 2003-2006 Jive Software.
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*
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* All rights reserved. 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.muc;
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import org.jivesoftware.smack.packet.Packet;
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import java.util.LinkedList;
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/**
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* A variant of the {@link org.jivesoftware.smack.PacketCollector} class
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* that does not force attachment to an <code>XMPPConnection</code>
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* on creation and no filter is required. Used to collect message
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* packets targeted to a group chat room.
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*
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* @author Larry Kirschner
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*/
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class ConnectionDetachedPacketCollector {
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/**
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* Max number of packets that any one collector can hold. After the max is
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* reached, older packets will be automatically dropped from the queue as
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* new packets are added.
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*/
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private static final int MAX_PACKETS = 65536;
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private LinkedList<Packet> resultQueue;
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/**
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* Creates a new packet collector. If the packet filter is <tt>null</tt>, then
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* all packets will match this collector.
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*/
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public ConnectionDetachedPacketCollector() {
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this.resultQueue = new LinkedList<Packet>();
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}
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/**
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* Polls to see if a packet is currently available and returns it, or
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* immediately returns <tt>null</tt> if no packets are currently in the
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* result queue.
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*
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* @return the next packet result, or <tt>null</tt> if there are no more
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* results.
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*/
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public synchronized Packet pollResult() {
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if (resultQueue.isEmpty()) {
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return null;
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}
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else {
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return resultQueue.removeLast();
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}
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}
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/**
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* Returns the next available packet. The method call will block (not return)
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* until a packet is available.
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*
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* @return the next available packet.
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*/
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public synchronized Packet nextResult() {
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// Wait indefinitely until there is a result to return.
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while (resultQueue.isEmpty()) {
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try {
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wait();
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}
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catch (InterruptedException ie) {
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// Ignore.
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}
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}
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return resultQueue.removeLast();
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}
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/**
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* Returns the next available packet. The method call will block (not return)
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* until a packet is available or the <tt>timeout</tt> has elapased. If the
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* timeout elapses without a result, <tt>null</tt> will be returned.
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*
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* @param timeout the amount of time to wait for the next packet (in milleseconds).
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* @return the next available packet.
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*/
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public synchronized Packet nextResult(long timeout) {
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// Wait up to the specified amount of time for a result.
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if (resultQueue.isEmpty()) {
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try {
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wait(timeout);
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}
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catch (InterruptedException ie) {
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// Ignore.
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}
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}
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// If still no result, return null.
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if (resultQueue.isEmpty()) {
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return null;
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}
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else {
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return resultQueue.removeLast();
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}
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}
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/**
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* Processes a packet to see if it meets the criteria for this packet collector.
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* If so, the packet is added to the result queue.
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*
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* @param packet the packet to process.
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*/
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protected synchronized void processPacket(Packet packet) {
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if (packet == null) {
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return;
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}
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// If the max number of packets has been reached, remove the oldest one.
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if (resultQueue.size() == MAX_PACKETS) {
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resultQueue.removeLast();
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}
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// Add the new packet.
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resultQueue.addFirst(packet);
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// Notify waiting threads a result is available.
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notifyAll();
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}
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}
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