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Documentation updates.
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@1969 b35dd754-fafc-0310-a699-88a17e54d16e
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Matt Tucker
mtucker
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5 changed files with 220 additions and 5 deletions
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@ -18,6 +18,10 @@ Documentation Contents:
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<ul>
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<li><a href="overview.html">Overview</a>
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<li><a href="gettingstarted.html">Getting Started Guide</a>
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<li><a href="messaging.html">Messaging using Smack</a>
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<li><a href="roster.html">Presence and Roster</a>
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<li><a href="processing.html">Processing Incoming Packets</a>
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<li><a href="extensions.html">Extending Packets</a>
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<li><a href="properties.html">Packet Properties</a>
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<li><a href="debugging.html">Debugging with Smack</a>
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</ul>
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108
documentation/messaging.html
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documentation/messaging.html
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<html>
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<head>
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<title>Smack: Chat - Jive Software</title>
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<link rel="stylesheet" type="text/css" href="style.css" />
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</head>
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<body>
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<div class="header">
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Messaging using Chat and GroupChat
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</div>
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<div class="nav">
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« <a href="index.html">Table of Contents</a>
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</div>
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<p>
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Sending messages back and forth is at the core of instant messaging. Two classes
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aid in sending and recieiving messages:
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<ul>
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<li> <tt>org.jivesoftware.smack.Chat</tt> -- used to send messages between two people.
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<li> <tt>org.jivesoftware.smack.GroupChat</tt> -- used to join a chat room to send messages between many people.
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</ul>
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Both the Chat and GroupChat classes use the <tt>org.jivesoftware.smack.packet.Message</tt> packet
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class to send messages. In certain circumstances, you may wish to bypass the higher-level
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Chat and GroupChat classes to send and listen for messages directly.
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</p>
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<p class="subheader">
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Chat
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</p>
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A chat creates a new thread of messgaes (using a thread ID) between two users. The
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following code snippet demonstrates how to create a new Chat with a user and then send
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them a text message:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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newChat.sendMessage(<font color="green">"Howdy!"</font>);
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</pre></div><p>
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The <tt>Chat.sendMessage(String)</tt> method is a convenience method that creates a Message
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object, sets the body using the String parameter, then sends the message. In the case
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that you wish to set additional values on a Message before sending it, use the
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<tt>Chat.createMessage()</tt> and <tt>Chat.sendMessage(Message)</tt> methods, as in the
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following code snippet:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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Message newMessage = newChat.createMessage();
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newMessage.setBody(<font color="green">"Howdy!"</font>);
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message.setProperty(<font color="green">"favoriteColor"</font>, <font color="green">"red"</font>);
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newChat.sendMessage(newMessage);
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</pre></div><p>
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The Chat object allows you to easily listen for replies from the other chat participant.
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The following code snippet is a parrot-bot -- it echoes back everything the other user types.<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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newMessage.setBody(<font color="green">"Hi, I'm an annoying parrot-bot! Type something back to me."</font>);
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<b>while</b> (<b>true</b>) {
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<font color="gray"><i>// Wait for the next message the user types to us.</i></font>
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Message message = newChat.nextMessage();
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<font color="gray"><i>// Send back the same text the other user sent us.</i></font>
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newChat.sendMessage(message.getBody());
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}
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</pre></div><p>
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The code above uses the <tt>Chat.nextMessage()</tt> method to get the next message, which
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will wait indefinitely until another message comes in. There are other methods to wait
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a specific amount of time for a new message, or you can add a listener that will be notified
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every time a new message arrives.
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<p class="subheader">
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GroupChat
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</p>
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A group chat connects to a chat room on a server and allows you to send and receive messages
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from a group of people. Before you can send or receive messages, you must join the room using
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a nickname. The following code snippet connects to a chat room and sends a
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message.<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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GroupChat newGroupChat = connection.createGroupChat(<font color="green">"test@jivesoftware.com"</font>);
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<font color="gray"><i>// Join the gropu chat using the nickname "jsmith".</i></font>
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newGroupChat.join(<font color="green">"jsmith"</font>);
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<font color="gray"><i>// Send a message to all the other people in the chat room.</i></font>
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newGroupChat.sendMessage(<font color="green">"Howdy!"</font>);
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</pre></div><p>
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In general, sending and receiving messages in a group chat works very similarly to
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the <tt>Chat</tt> class. Method are also provided to get the list of the other
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users in the room.<p>
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<br clear="all" /><br><br>
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<div class="footer">
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Copyright © Jive Software 2002-2003
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</div>
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</body>
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</html>
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@ -16,11 +16,11 @@ Smack Overview
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<p>
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Smack is a library for communicating with XMPP (Jabber) servers to perform
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instant messaging and chat.
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Smack is a library for communicating with XMPP servers to perform
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instant messaging and chat.<p>
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<p class="subheader">
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Key Advantages:
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Smack Key Advantages
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</p>
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<ul>
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@ -47,6 +47,18 @@ connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>).send
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non-commercial applications.
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</ul>
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<p class="subheader">
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About XMPP
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</p>
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XMPP (eXtensible Messaging and Presence Protocol) is an open, XML based protocol
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making it's way through the IETF approval process under the guidance of the
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Jabber Software Foundation (<a href="http://www.jabber.org">http://www.jabber.org</a>).
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For a good overview of the protocol, read the first chapter of <u>Instant Messaging
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in Java</u>, available free at
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<a href="http://www.jivesoftware.com/products/messenger/book/">http://www.jivesoftware.com/products/messenger/book/</a>
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<br clear="all" /><br><br>
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<div class="footer">
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Copyright © Jive Software 2002-2003
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</div>
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@ -0,0 +1,86 @@
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<html>
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<head>
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<title>Smack: Processing Incoming Packets - Jive Software</title>
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<link rel="stylesheet" type="text/css" href="style.css" />
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</head>
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<body>
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<div class="header">
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Processing Incoming Packets
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</div>
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<div class="nav">
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« <a href="index.html">Table of Contents</a>
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</div>
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<p>
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Smack provides a flexible framework for processing incoming packets using two constructs:
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<ul>
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<li><tt>org.jivesoftware.smack.PacketCollector</tt> -- a class that lets you
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synchronously wait for new packets.
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<li><tt>org.jivesoftware.smack.PacketListener</tt> -- an interface for asynchronously
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notifying you of incoming packets.
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</ul>
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A packet listener is used for event style programming, while a packet collector has a
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result queue of packets that you can do polling and blocking operations on. So, a packet
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listener is useful when you want to take some action whenever a packet happens to come in,
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while a packet collector is useful when you want to wait for a specific packet to come
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through. Packet collectors and listeners can be created using an <tt>XMPPConnection</tt> object.<p>
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The <tt>org.jivesoftware.smack.filter.PacketFilter</tt> interface determines which
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specific packets will be delivered to a <tt>PacketCollector</tt> or <tt>PacketListener</tt>.
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Many pre-defined filters can be found in the <tt>org.jivesoftware.smack.filter</tt> package.
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<p>
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The following code snippet demonstrates registering both a packet collector and a packet
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listener:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Create a packet filter to listen for new messages from a particular</i></font>
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<font color="gray"><i>// user. We use an AndFilter to combine two other filters.</i></font>
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PacketFilter filter = new AndFilter(new PacketTypeTypeFilter(<b>Message.class</b>),
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new FromContainsFilter(<font color="green">"mary@jivesoftware.com"</font>));
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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<font color="gray"><i>// First, register a packet collector using the filter we created.</i></font>
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PacketCollector myCollector = connection.createPacketCollector(filter);
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<font color="gray"><i>// Normally, you'd do something with the collector, like wait for new packets.</i></font>
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<font color="gray"><i>// Next, create a packet listener. We use an anonymous inner class for brevity.</i></font>
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PacketListener myListener = new PacketListener() {
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<b>public</b> <b>void</b> processPacket(Packet packet) {
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<font color="gray"><i>// Do something with the incoming packet here.</i></font>
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}
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};
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<font color="gray"><i>// Register the listener.</i></font>
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connection.addPacketListener(myListener, filter);
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</pre></div><p>
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<p class="subheader">
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Standard Packet Filters
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</p>
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A rich set of packet filters are included with Smack, or you can create your own filters by coding
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to the <tt>PacketFilter</tt> interface. The default set of filters includes:
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<ul>
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<li> <tt>PacketTypeFilter</tt> -- filters for packets that are a particular Class type.
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<li> <tt>PacketIDFilter</tt> -- filters for packets with a particular packet ID.
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<li> <tt>ThreadFilter</tt> -- filters for message packets with a parituclar thread ID.
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<li> <tt>ToContainsFilter</tt> -- filters for packets that are sent to a particular address.
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<li> <tt>FromContainsFilter</tt> -- filters for packets that are sent to a particular address.
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<li> <tt>PacketExtensionFilter</tt> -- filters for packets that have a particular packet extension.
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<li> <tt>AndFilter</tt> -- implements the logical AND operation over two filters.
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<li> <tt>OrFilter</tt> -- implements the logical OR operation over two filters.
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<li> <tt>NotFilter</tt> -- implements the logical NOT operation on a filter.
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</ul>
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<br clear="all" /><br><br>
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<div class="footer">
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Copyright © Jive Software 2002-2003
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</div>
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</body>
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</html>
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@ -63,8 +63,13 @@ you should keep the following in mind:
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</p>
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<ul>
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<li>When you send a Java object, only clients running Java will be able to interpret the data.
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So, consider using a series of primitive values to transfer data instead.
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<li>Packet extensions are the more standard way to add extra data to XMPP stanzas. Using
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properties may be more convenient in some cases, however, since Smack will do the
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work of handling the XML.
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<li>When you send a Java object as a property, only clients running Java will be able to
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interpret the data. So, consider using a series of primitive values to transfer data
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instead.
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<li>Objects sent as property values must implement Serialiable. Additionally, both the sender
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and receiver must have identical versions of the class, or a serialization exception
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