openvidu-server: Network quality

- Added method to send notification with network quality
- Added double parser method

openvidu-server/src/main/java/io/openvidu/server/config/OpenviduConfig.java

@@ -772,6 +772,20 @@ public class OpenviduConfig {
 		}
 	}
 
+	protected Double asNonNegativeDouble(String property) {
+		try {
+			Double doubleValue = Double.parseDouble(getValue(property));
+
+			if (doubleValue < 0) {
+				addError(property, "Is not a non negative double");
+			}
+			return doubleValue;
+		} catch (NumberFormatException e) {
+			addError(property, "Is not a non negative doubleValue");
+			return 0.0;
+		}
+	}
+
 	/*
 	 * This method checks all types of Internet addresses (IPv4, IPv6 and Domains)
 	 */

openvidu-server/src/main/java/io/openvidu/server/core/SessionEventsHandler.java

@@ -311,6 +311,10 @@ public class SessionEventsHandler {
 		rpcNotificationService.sendResponse(participant.getParticipantPrivateId(), transactionId, new JsonObject());
 	}
 
+	public void onNetworkQualityChanged(Participant participant, JsonObject params ) {
+		rpcNotificationService.sendNotification(participant.getParticipantPrivateId(), ProtocolElements.NETWORKQUALITYCHANGED_METHOD, params);
+	}
+
 	public void onSendMessage(Participant participant, JsonObject message, Set<Participant> participants,
 			Integer transactionId, OpenViduException error) {