/**
* Notifies this instance that the <tt>SctpConnection</tt> of/associated with a specific
* <tt>Endpoint</tt> participating in this <tt>Conference</tt> has changed.
*
* @param endpoint the <tt>Endpoint</tt> participating in this <tt>Conference</tt> which has had
* its (associated) <tt>SctpConnection</tt> changed
*/
private void endpointSctpConnectionChanged(
Endpoint endpoint, SctpConnection oldValue, SctpConnection newValue) {
// We want to fire initial events (e.g. dominant speaker) over the
// SctpConnection as soon as it is ready.
if (oldValue != null) {
oldValue.removeChannelListener(webRtcDataStreamListener);
}
if (newValue != null) {
newValue.addChannelListener(webRtcDataStreamListener);
// The SctpConnection may itself be ready already. If this is the
// case, then it has now become ready for this Conference.
if (newValue.isReady()) sctpConnectionReady(newValue);
}
}
/**
* Appends the XML <tt>String</tt> representation of this <tt>Content</tt> to a specific
* <tt>StringBuilder</tt>.
*
* @param xml the <tt>StringBuilder</tt> to which the XML <tt>String</tt> representation of this
* <tt>Content</tt> is to be appended
*/
public void toXML(StringBuilder xml) {
xml.append('<').append(ELEMENT_NAME);
xml.append(' ').append(NAME_ATTR_NAME).append("='").append(getName()).append('\'');
List<Channel> channels = getChannels();
List<SctpConnection> connections = getSctpConnections();
if (channels.size() == 0 && connections.size() == 0) {
xml.append(" />");
} else {
xml.append('>');
for (Channel channel : channels) channel.toXML(xml);
for (SctpConnection conn : connections) conn.toXML(xml);
xml.append("</").append(ELEMENT_NAME).append('>');
}
}
/**
* Notifies this instance that a specific <tt>SctpConnection</tt> has become ready i.e. connected
* to a/the remote peer and operational.
*
* @param sctpConnection the <tt>SctpConnection</tt> which has become ready and is the cause of
* the method invocation
*/
private void sctpConnectionReady(SctpConnection sctpConnection) {
/*
* We want to fire initial events over the SctpConnection as soon as it
* is ready, we do not want to fire them multiple times i.e. every time
* the SctpConnection becomes ready.
*/
sctpConnection.removeChannelListener(webRtcDataStreamListener);
if (!isExpired() && !sctpConnection.isExpired() && sctpConnection.isReady()) {
Endpoint endpoint = sctpConnection.getEndpoint();
if (endpoint != null) endpoint = getEndpoint(endpoint.getID());
if (endpoint != null) {
/*
* It appears that this Conference, the SctpConnection and the
* Endpoint are in states which allow them to fire the initial
* events.
*/
Endpoint dominantSpeaker = speechActivity.getDominantEndpoint();
if (dominantSpeaker != null) {
try {
endpoint.sendMessageOnDataChannel(
createDominantSpeakerEndpointChangeEvent(dominantSpeaker));
} catch (IOException e) {
logger.error("Failed to send message on data channel.", e);
}
}
/*
* Determining the instant at which an SctpConnection associated
* with an Endpoint becomes ready (i.e. connected to the remote
* peer and operational) is a multi-step ordeal. The Conference
* class implements the procedure so do not make other classes
* implement it as well.
*/
endpoint.sctpConnectionReady(sctpConnection);
}
}
}
