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244 lines
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<title>Message Events</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">Message Events</div><p>
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This extension is used to request and respond to events relating to the delivery,
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display, and composition of messages. There are three stages in this extension:<ol>
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<li>Request for event notifications,
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<li>Receive the event notification requests and send event notifications, and
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<li>Receive the event notifications.</ol>
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<p>For more information on each stage please follow these links:</p>
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<ul>
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<li><a href="#reqevnot">Requesting Event Notifications</a></li>
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<li><a href="#lstevnotreq">Reacting to Event Notification Requests</a></li>
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<li><a href="#lstevnot">Reacting to Event Notifications</a></li>
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</ul>
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<b>JEP related:</b> <a href="http://www.jabber.org/jeps/jep-0022.html">JEP-22</a>
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<hr>
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<div class="subheader"><a name="reqevnot">Requesting Event Notifications</a></div><p>
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<b>Description</b><p>
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In order to receive event notifications for a given message you first have to specify
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which events are you interested in. Each message that you send has to request its own event
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notifications. Therefore, every message that you send as part of a chat should request its own event
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notifications.</p>
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<b>Usage</b><p>
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The class <i>MessageEventManager</i> provides an easy way for requesting event notifications. All you have to do is specify
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the message that requires the event notifications and the events that you are interested in.
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<p>Use the static method <i><b>MessageEventManager.addNotificationsRequests(Message message, boolean offline, boolean
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delivered, boolean displayed, boolean composing)</b></i> for requesting event notifications.
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</p>
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<b>Example</b><p>
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Below you can find an example that logs in a user to the server, creates a message, adds the requests
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for notifications and sends the message.
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<blockquote>
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<pre> <font color="#3f7f5f">// Connect to the server and log in</font>
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conn1 = new XMPPConnection(host);
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conn1.login(server_user1, pass1);
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<font color="#3f7f5f">// Create a chat with user2</font>
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Chat chat1 = conn1.createChat(user2);
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<font color="#3f7f5f">// Create a message to send</font>
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Message msg = chat1.createMessage();
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msg.setSubject(<font color="#0000FF">"Any subject you want"</font>);
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msg.setBody(<font color="#0000FF">"An interesting body comes here..."</font>);
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<font color="#3f7f5f">// Add to the message all the notifications requests (offline, delivered, displayed,</font>
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<font color="#3f7f5f">// composing)</font>
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MessageEventManager.addNotificationsRequests(msg, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>);
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<font color="#3f7f5f">// Send the message that contains the notifications request</font>
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chat1.sendMessage(msg);
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</pre>
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</blockquote>
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<hr>
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<div class="subheader"><a name="lstevnotreq">Reacting to Event Notification Requests</a></div><p>
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<b>Description</b><p>
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You can receive notification requests for the following events: delivered, displayed, composing and offline. You
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<b>must</b> listen for these requests and react accordingly.</p>
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<b>Usage</b><p>
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The general idea is to create a new <i>DefaultMessageEventRequestListener</i> that will listen to the event notifications
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requests and react with custom logic. Then you will have to add the listener to the
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<i>MessageEventManager</i> that works on
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the desired <i>Connection</i>.
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<p>Note that <i>DefaultMessageEventRequestListener</i> is a default implementation of the
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<i>MessageEventRequestListener</i> interface.
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The class <i>DefaultMessageEventRequestListener</i> automatically sends a delivered notification to the sender of the message
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if the sender has requested to be notified when the message is delivered. If you decide to create a new class that
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implements the <i>MessageEventRequestListener</i> interface, please remember to send the delivered notification.</p>
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<ul>
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<li>To create a new <i>MessageEventManager</i> use the <i><b>MessageEventManager(Connection)</b></i> constructor.
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</li>
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<li>To create an event notification requests listener create a subclass of <i><b>DefaultMessageEventRequestListener</b></i> or
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create a class that implements the <i><b>MessageEventRequestListener</b></i> interface.
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</li>
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<li>To add a listener to the messageEventManager use the MessageEventManager's message
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<i><b>addMessageEventRequestListener(MessageEventRequestListener)</b></i>.</li>
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</ul></p>
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<b>Example</b><p>
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Below you can find an example that connects two users to the server. One user will create a message, add the requests
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for notifications and will send the message to the other user. The other user will add a
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<i>DefaultMessageEventRequestListener</i>
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to a <i>MessageEventManager</i> that will listen and react to the event notification requested by the other user.
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<blockquote>
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<pre> <font color="#3f7f5f">// Connect to the server and log in the users</font>
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conn1 = new XMPPConnection(host);
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conn1.login(server_user1, pass1);
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conn2 = new XMPPConnection(host);
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conn2.login(server_user2, pass2);
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<font color="#3f7f5f">// User2 creates a MessageEventManager</font>
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MessageEventManager messageEventManager = new MessageEventManager(conn2);
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<font color="#3f7f5f">// User2 adds the listener that will react to the event notifications requests</font>
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messageEventManager.addMessageEventRequestListener(new DefaultMessageEventRequestListener() {
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public void deliveredNotificationRequested(
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String from,
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String packetID,
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MessageEventManager messageEventManager) {
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super.deliveredNotificationRequested(from, packetID, messageEventManager);
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<font color="#3f7f5f">// DefaultMessageEventRequestListener automatically responds that the message was delivered when receives this request</font>
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System.out.println(<font color="#0000FF">"Delivered Notification Requested (" + from + ", " + packetID + ")"</font>);
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}
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public void displayedNotificationRequested(
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String from,
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String packetID,
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MessageEventManager messageEventManager) {
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super.displayedNotificationRequested(from, packetID, messageEventManager);
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<font color="#3f7f5f">// Send to the message's sender that the message was displayed</font>
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messageEventManager.sendDisplayedNotification(from, packetID);
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}
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public void composingNotificationRequested(
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String from,
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String packetID,
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MessageEventManager messageEventManager) {
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super.composingNotificationRequested(from, packetID, messageEventManager);
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<font color="#3f7f5f">// Send to the message's sender that the message's receiver is composing a reply</font>
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messageEventManager.sendComposingNotification(from, packetID);
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}
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public void offlineNotificationRequested(
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String from,
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String packetID,
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MessageEventManager messageEventManager) {
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super.offlineNotificationRequested(from, packetID, messageEventManager);
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<font color="#3f7f5f">// The XMPP server should take care of this request. Do nothing.</font>
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System.out.println(<font color="#0000FF">"Offline Notification Requested (" + from + ", " + packetID + ")"</font>);
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}
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});
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<font color="#3f7f5f">// User1 creates a chat with user2</font>
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Chat chat1 = conn1.createChat(user2);
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<font color="#3f7f5f">// User1 creates a message to send to user2</font>
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Message msg = chat1.createMessage();
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msg.setSubject(<font color="#0000FF">"Any subject you want"</font>);
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msg.setBody(<font color="#0000FF">"An interesting body comes here..."</font>);
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<font color="#3f7f5f">// User1 adds to the message all the notifications requests (offline, delivered, displayed,</font>
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<font color="#3f7f5f">// composing)</font>
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MessageEventManager.addNotificationsRequests(msg, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>);
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<font color="#3f7f5f">// User1 sends the message that contains the notifications request</font>
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chat1.sendMessage(msg);
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Thread.sleep(500);
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<font color="#3f7f5f">// User2 sends to the message's sender that the message's receiver cancelled composing a reply</font>
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messageEventManager.sendCancelledNotification(user1, msg.getPacketID());
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</pre>
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</blockquote>
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<hr>
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<div class="subheader"><a name="lstevnot">Reacting to Event Notifications</a></div><p>
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<b>Description</b><p>
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Once you have requested for event notifications you will start to receive notifications of events. You can
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receive notifications of the following events: delivered, displayed, composing, offline and cancelled. You
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will probably want to react to some or all of these events.</p>
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<b>Usage</b><p>
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The general idea is to create a new <i>MessageEventNotificationListener</i> that will listen to the event notifications
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and react with custom logic. Then you will have to add the listener to the <i>MessageEventManager</i> that works on
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the desired <i>Connection</i>.
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<ul>
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<li>To create a new <i>MessageEventManager</i> use the <i><b>MessageEventManager(Connection)</b></i> constructor.
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</li>
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<li>To create an event notifications listener create a class that implements the <i><b>MessageEventNotificationListener</b></i>
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interface.
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</li>
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<li>To add a listener to the messageEventManager use the MessageEventManager's message
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<i><b>addMessageEventNotificationListener(MessageEventNotificationListener)</b></i>.</li>
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</ul></p>
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<b>Example</b><p>
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Below you can find an example that logs in a user to the server, adds a <i>MessageEventNotificationListener</i>
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to a <i>MessageEventManager</i> that will listen and react to the event notifications, creates a message, adds
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the requests for notifications and sends the message.
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<blockquote>
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<pre> <font color="#3f7f5f">// Connect to the server and log in</font>
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conn1 = new XMPPConnection(host);
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conn1.login(server_user1, pass1);
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<font color="#3f7f5f">// Create a MessageEventManager</font>
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MessageEventManager messageEventManager = new MessageEventManager(conn1);
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<font color="#3f7f5f">// Add the listener that will react to the event notifications</font>
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messageEventManager.addMessageEventNotificationListener(new MessageEventNotificationListener() {
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public void deliveredNotification(String from, String packetID) {
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System.out.println(<font color="#0000FF">"The message has been delivered (" + from + ", " + packetID + ")"</font>);
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}
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public void displayedNotification(String from, String packetID) {
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System.out.println(<font color="#0000FF">"The message has been displayed (" + from + ", " + packetID + ")"</font>);
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}
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public void composingNotification(String from, String packetID) {
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System.out.println(<font color="#0000FF">"The message's receiver is composing a reply (" + from + ", " + packetID + ")"</font>);
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}
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public void offlineNotification(String from, String packetID) {
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System.out.println(<font color="#0000FF">"The message's receiver is offline (" + from + ", " + packetID + ")"</font>);
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}
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public void cancelledNotification(String from, String packetID) {
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System.out.println(<font color="#0000FF">"The message's receiver cancelled composing a reply (" + from + ", " + packetID + ")"</font>);
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}
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});
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<font color="#3f7f5f">// Create a chat with user2</font>
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Chat chat1 = conn1.createChat(user2);
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<font color="#3f7f5f">// Create a message to send</font>
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Message msg = chat1.createMessage();
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msg.setSubject(<font color="#0000FF">"Any subject you want"</font>);
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msg.setBody(<font color="#0000FF">"An interesting body comes here..."</font>);
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<font color="#3f7f5f">// Add to the message all the notifications requests (offline, delivered, displayed,</font>
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<font color="#3f7f5f">// composing)</font>
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MessageEventManager.addNotificationsRequests(msg, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>, <font COLOR="#7f0055"><b>true</b></font>);
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<font color="#3f7f5f">// Send the message that contains the notifications request</font>
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chat1.sendMessage(msg);
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</pre>
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</blockquote>
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</body>
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</html> |