mirror of
https://codeberg.org/Mercury-IM/Smack
synced 2024-11-30 10:12:06 +01:00
205 lines
9.1 KiB
Markdown
205 lines
9.1 KiB
Markdown
Message Events
|
|
==============
|
|
|
|
This extension is used to request and respond to events relating to the
|
|
delivery, display, and composition of messages. There are three stages in this
|
|
extension:
|
|
|
|
1. Request for event notifications,
|
|
2. Receive the event notification requests and send event notifications, and
|
|
3. Receive the event notifications.
|
|
|
|
**XEP related:** [XEP-22](http://www.xmpp.org/extensions/xep-0022.html)
|
|
|
|
Requesting Event Notifications
|
|
------------------------------
|
|
|
|
**Description**
|
|
|
|
In order to receive event notifications for a given message you first have to
|
|
specify which events are you interested in. Each message that you send has to
|
|
request its own event notifications. Therefore, every message that you send as
|
|
part of a chat should request its own event notifications.
|
|
|
|
**Usage**
|
|
|
|
The class _MessageEventManager_ provides an easy way for requesting event
|
|
notifications. All you have to do is specify the message that requires the
|
|
event notifications and the events that you are interested in.
|
|
|
|
Use the static method _**MessageEventManager.addNotificationsRequests(Message
|
|
message, boolean offline, boolean delivered, boolean displayed, boolean
|
|
composing)**_ for requesting event notifications.
|
|
|
|
**Example**
|
|
|
|
Below you can find an example that logs in a user to the server, creates a
|
|
message, adds the requests for notifications and sends the message.
|
|
|
|
```
|
|
// Connect to the server and log in
|
|
conn1 = new XMPPConnection(host);
|
|
conn1.login(server_user1, pass1);
|
|
// Create a chat with user2
|
|
Chat chat1 = conn1.createChat(user2);
|
|
// Create a message to send
|
|
Message msg = chat1.createMessage();
|
|
msg.setSubject("Any subject you want");
|
|
msg.setBody("An interesting body comes here...");
|
|
// Add to the message all the notifications requests (offline,
|
|
// composing)
|
|
MessageEventManager.addNotificationsRequests(msg, **true**, **true**, **true**, **true**);
|
|
// Send the message that contains the notifications request
|
|
chat1.sendMessage(msg);
|
|
```
|
|
|
|
Reacting to Event Notification Requests
|
|
---------------------------------------
|
|
|
|
**Description**
|
|
|
|
You can receive notification requests for the following events: delivered,
|
|
displayed, composing and offline. You **must** listen for these requests and
|
|
react accordingly.
|
|
|
|
**Usage**
|
|
|
|
The general idea is to create a new _DefaultMessageEventRequestListener_ that
|
|
will listen to the event notifications requests and react with custom logic.
|
|
Then you will have to add the listener to the _MessageEventManager_ that works
|
|
on the desired _XMPPConnection_.
|
|
|
|
Note that _DefaultMessageEventRequestListener_ is a default implementation of
|
|
the _MessageEventRequestListener_ interface. The class
|
|
_DefaultMessageEventRequestListener_ automatically sends a delivered
|
|
notification to the sender of the message if the sender has requested to be
|
|
notified when the message is delivered. If you decide to create a new class
|
|
that implements the _MessageEventRequestListener_ interface, please remember
|
|
to send the delivered notification.
|
|
|
|
* To create a new _MessageEventManager_ use the _**MessageEventManager(XMPPConnection)**_ constructor.
|
|
* To create an event notification requests listener create a subclass of _**DefaultMessageEventRequestListener**_ or create a class that implements the _**MessageEventRequestListener**_ interface.
|
|
* To add a listener to the messageEventManager use the MessageEventManager's message _**addMessageEventRequestListener(MessageEventRequestListener)**_.
|
|
|
|
**Example**
|
|
|
|
Below you can find an example that connects two users to the server. One user
|
|
will create a message, add the requests for notifications and will send the
|
|
message to the other user. The other user will add a
|
|
_DefaultMessageEventRequestListener_ to a _MessageEventManager_ that will
|
|
listen and react to the event notification requested by the other user.
|
|
|
|
```
|
|
// Connect to the server and log in the users
|
|
conn1 = new XMPPConnection(host);
|
|
conn1.login(server_user1, pass1);
|
|
conn2 = new XMPPConnection(host);
|
|
conn2.login(server_user2, pass2);
|
|
// User2 creates a MessageEventManager
|
|
MessageEventManager messageEventManager = new MessageEventManager(conn2);
|
|
// User2 adds the listener that will react to the event notifications requests
|
|
messageEventManager.addMessageEventRequestListener(new DefaultMessageEventRequestListener() {
|
|
public void deliveredNotificationRequested(
|
|
String from,
|
|
String packetID,
|
|
MessageEventManager messageEventManager) {
|
|
super.deliveredNotificationRequested(from, packetID, messageEventManager);
|
|
// DefaultMessageEventRequestListener automatically responds that the message was delivered when receives this r
|
|
System.out.println("Delivered Notification Requested (" + from + ", " + packetID + ")");
|
|
}
|
|
public void displayedNotificationRequested(String from, String packetID, MessageEventManager messageEventManager) {
|
|
super.displayedNotificationRequested(from, packetID,
|
|
// Send to the message's sender that the message was
|
|
messageEventManager.sendDisplayedNotification(from, packetID);
|
|
}
|
|
public void composingNotificationRequested(String from, String packetID, MessageEventManager messageEventManager) {
|
|
super.composingNotificationRequested(from, packetID, messageEventManager);
|
|
// Send to the message's sender that the message's receiver is composing a reply
|
|
messageEventManager.sendComposingNotification(from, packetID);
|
|
}
|
|
public void offlineNotificationRequested(String from, String packetID, MessageEventManager messageEventManager) {
|
|
super.offlineNotificationRequested(from, packetID, messageEventManager);
|
|
// The XMPP server should take care of this request. Do nothing.
|
|
System.out.println("Offline Notification Requested (" + from + ", " + packetID + ")");
|
|
}
|
|
});
|
|
// User1 creates a chat with user2
|
|
Chat chat1 = conn1.createChat(user2);
|
|
// User1 creates a message to send to user2
|
|
Message msg = chat1.createMessage();
|
|
msg.setSubject("Any subject you want");
|
|
msg.setBody("An interesting body comes here...");
|
|
// User1 adds to the message all the notifications requests (offline, delivered, displayed,
|
|
// composing)
|
|
MessageEventManager.addNotificationsRequests(msg, true, true, true, true);
|
|
// User1 sends the message that contains the notifications request
|
|
chat1.sendMessage(msg);
|
|
Thread.sleep(500);
|
|
// User2 sends to the message's sender that the message's receiver cancelled composing a reply
|
|
messageEventManager.sendCancelledNotification(user1, msg.getPacketID());
|
|
```
|
|
|
|
Reacting to Event Notifications
|
|
-------------------------------
|
|
|
|
**Description**
|
|
|
|
Once you have requested for event notifications you will start to receive
|
|
notifications of events. You can receive notifications of the following
|
|
events: delivered, displayed, composing, offline and cancelled. You will
|
|
probably want to react to some or all of these events.
|
|
|
|
**Usage**
|
|
|
|
The general idea is to create a new _MessageEventNotificationListener_ that
|
|
will listen to the event notifications and react with custom logic. Then you
|
|
will have to add the listener to the _MessageEventManager_ that works on the
|
|
desired _XMPPConnection_.
|
|
|
|
* To create a new _MessageEventManager_ use the _**MessageEventManager(XMPPConnection)**_ constructor.
|
|
* To create an event notifications listener create a class that implements the _**MessageEventNotificationListener**_ interface.
|
|
* To add a listener to the messageEventManager use the MessageEventManager's message _**addMessageEventNotificationListener(MessageEventNotificationListener)**_.
|
|
|
|
**Example**
|
|
|
|
Below you can find an example that logs in a user to the server, adds a
|
|
_MessageEventNotificationListener_ to a _MessageEventManager_ that will listen
|
|
and react to the event notifications, creates a message, adds the requests for
|
|
notifications and sends the message.
|
|
|
|
```
|
|
// Connect to the server and log in
|
|
conn1 = new XMPPConnection(host);
|
|
conn1.login(server_user1, pass1);
|
|
// Create a MessageEventManager
|
|
MessageEventManager messageEventManager = new MessageEventManager(conn1);
|
|
// Add the listener that will react to the event notifications
|
|
messageEventManager.addMessageEventNotificationListener(new MessageEventNotificationListener() {
|
|
public void deliveredNotification(String from, String packetID) {
|
|
System.out.println("The message has been delivered (" + from + ", " + packetID + ")");
|
|
}
|
|
public void displayedNotification(String from, String packetID) {
|
|
System.out.println("The message has been displayed (" + from + ", " + packetID + ")");
|
|
}
|
|
public void composingNotification(String from, String packetID) {
|
|
System.out.println("The message's receiver is composing a reply (" + from + ", " + packetID + ")");
|
|
}
|
|
public void offlineNotification(String from, String packetID) {
|
|
System.out.println("The message's receiver is offline (" + from + ", " + packetID + ")");
|
|
}
|
|
public void cancelledNotification(String from, String packetID) {
|
|
System.out.println("The message's receiver cancelled composing a reply (" + from + ", " + packetID + ")");
|
|
}
|
|
});
|
|
// Create a chat with user2
|
|
Chat chat1 = conn1.createChat(user2);
|
|
// Create a message to send
|
|
Message msg = chat1.createMessage();
|
|
msg.setSubject("Any subject you want");
|
|
msg.setBody("An interesting body comes here...");
|
|
// Add to the message all the notifications requests (offline, delivered, displayed,
|
|
// composing)
|
|
MessageEventManager.addNotificationsRequests(msg, **true**, **true**, **true**, **true**);
|
|
// Send the message that contains the notifications request
|
|
chat1.sendMessage(msg);
|
|
```
|