/**
* Poll for new messages in a stream. If new messages are found beyond the last consumed position then they
* will be delivered to the {@link FileBlockHandler} up to a limited number of bytes.
*
* @param fileBlockHandler to which block is delivered.
* @param blockLengthLimit up to which a block may be in length.
* @return the number of bytes that have been consumed.
*/
public int filePoll(FileBlockHandler fileBlockHandler, int blockLengthLimit)
{
if (isClosed)
{
return(0);
}
long position = subscriberPosition.get();
int termOffset = (int)position & termLengthMask;
int activeIndex = indexByPosition(position, positionBitsToShift);
DirectBuffer termBuffer = termBuffers[activeIndex];
int capacity = termBuffer.capacity();
int limit = Math.min(termOffset + blockLengthLimit, capacity);
int resultingOffset = TermBlockScanner.scan(termBuffer, termOffset, limit);
int bytesConsumed = resultingOffset - termOffset;
if (resultingOffset > termOffset)
{
try {
long offset = ((long)capacity * activeIndex) + termOffset;
int termId = termBuffer.getInt(termOffset + TERM_ID_FIELD_OFFSET, LITTLE_ENDIAN);
fileBlockHandler.onBlock(logBuffers.fileChannel(), offset, bytesConsumed, sessionId, termId);
} catch (Throwable t) {
errorHandler.onError(t);
}
subscriberPosition.setOrdered(position + bytesConsumed);
}
return(bytesConsumed);
}
/**
* Poll for new messages in a stream. If new messages are found beyond the last consumed position then they
* will be delivered to the {@link BlockHandler} up to a limited number of bytes.
*
* @param blockHandler to which block is delivered.
* @param blockLengthLimit up to which a block may be in length.
* @return the number of bytes that have been consumed.
*/
public int blockPoll(BlockHandler blockHandler, int blockLengthLimit)
{
if (isClosed)
{
return(0);
}
long position = subscriberPosition.get();
int termOffset = (int)position & termLengthMask;
DirectBuffer termBuffer = activeTermBuffer(position);
int limit = Math.min(termOffset + blockLengthLimit, termBuffer.capacity());
int resultingOffset = TermBlockScanner.scan(termBuffer, termOffset, limit);
int bytesConsumed = resultingOffset - termOffset;
if (resultingOffset > termOffset)
{
try {
int termId = termBuffer.getInt(termOffset + TERM_ID_FIELD_OFFSET, LITTLE_ENDIAN);
blockHandler.onBlock(termBuffer, termOffset, bytesConsumed, sessionId, termId);
} catch (Throwable t) {
errorHandler.onError(t);
}
subscriberPosition.setOrdered(position + bytesConsumed);
}
return(bytesConsumed);
}