/**
* Combines and returns queued messages combined into a single string. Combines as many messages
* as possible, while staying under MAX_PAYLOAD_SIZE. Returns null if the queue is empty.
*/
public String popAndEncode(boolean fromOnlineEvent) {
synchronized (this) {
registeredListeners[activeListenerIndex].notifyOfFlush(fromOnlineEvent);
if (queue.isEmpty()) {
return null;
}
int totalPayloadLen = 0;
int numMessagesToSend = 0;
for (JsMessage message : queue) {
int messageSize = calculatePackedMessageLength(message);
if (numMessagesToSend > 0
&& totalPayloadLen + messageSize > MAX_PAYLOAD_SIZE
&& MAX_PAYLOAD_SIZE > 0) {
break;
}
totalPayloadLen += messageSize;
numMessagesToSend += 1;
}
StringBuilder sb = new StringBuilder(totalPayloadLen);
for (int i = 0; i < numMessagesToSend; ++i) {
JsMessage message = queue.removeFirst();
packMessage(message, sb);
}
if (!queue.isEmpty()) {
// Attach a char to indicate that there are more messages pending.
sb.append('*');
}
String ret = sb.toString();
return ret;
}
}
