public int appendFragmentedMessage(
final long defaultVersionFlagsType,
final long defaultSessionId,
final DirectBuffer srcBuffer,
final int srcOffset,
final int length,
final int maxPayloadLength) {
final int numMaxPayloads = length / maxPayloadLength;
final int remainingPayload = length % maxPayloadLength;
final int lastFrameLength =
(remainingPayload > 0) ? align(remainingPayload + HEADER_LENGTH, FRAME_ALIGNMENT) : 0;
final int requiredLength =
(numMaxPayloads * (maxPayloadLength + HEADER_LENGTH)) + lastFrameLength;
int termOffset = metaDataBuffer.getAndAddInt(TERM_TAIL_COUNTER_OFFSET, requiredLength);
final UnsafeBuffer termBuffer = this.termBuffer;
final int capacity = termBuffer.capacity();
int resultingOffset = termOffset + requiredLength;
if (resultingOffset > (capacity - HEADER_LENGTH)) {
resultingOffset =
handleEndOfLogCondition(
termBuffer, termOffset, defaultVersionFlagsType, defaultSessionId, capacity);
} else {
byte flags = BEGIN_FRAG_FLAG;
int remaining = length;
do {
final int bytesToWrite = Math.min(remaining, maxPayloadLength);
final int frameLength = bytesToWrite + HEADER_LENGTH;
final int alignedLength = align(frameLength, FRAME_ALIGNMENT);
applyDefaultHeader(
termBuffer, termOffset, frameLength, defaultVersionFlagsType, defaultSessionId);
termBuffer.putBytes(
termOffset + HEADER_LENGTH, srcBuffer, srcOffset + (length - remaining), bytesToWrite);
if (remaining <= maxPayloadLength) {
flags |= END_FRAG_FLAG;
}
frameFlags(termBuffer, termOffset, flags);
frameLengthOrdered(termBuffer, termOffset, frameLength);
flags = 0;
termOffset += alignedLength;
remaining -= bytesToWrite;
} while (remaining > 0);
}
return resultingOffset;
}
/**
* Get the current tail value in a volatile memory ordering fashion. If raw tail is greater than
* term capacity then capacity will be returned.
*
* @return the current tail value.
*/
public int tailVolatile() {
return Math.min(metaDataBuffer.getIntVolatile(TERM_TAIL_COUNTER_OFFSET), termBuffer.capacity());
}