/** gets the buffer for receiving message length bytes */
protected void ensureCapacity(int bufferSize) {
// Ok, so we have a buffer that's big enough
if (nioInputBuffer != null && nioInputBuffer.capacity() > bufferSize) {
if (nioInputBuffer.capacity() - lastProcessedPosition < bufferSize) {
nioInputBuffer.limit(lastReadPosition);
nioInputBuffer.position(lastProcessedPosition);
nioInputBuffer.compact();
lastReadPosition = nioInputBuffer.position();
lastProcessedPosition = 0;
}
return;
}
// otherwise, we have no buffer to a buffer that's too small
if (nioInputBuffer == null) {
int allocSize = conn.getReceiveBufferSize();
if (allocSize == -1) {
allocSize = conn.owner.getConduit().tcpBufferSize;
}
if (allocSize > bufferSize) {
bufferSize = allocSize;
}
}
ByteBuffer oldBuffer = nioInputBuffer;
nioInputBuffer = Buffers.acquireReceiveBuffer(bufferSize, getStats());
if (oldBuffer != null) {
oldBuffer.limit(lastReadPosition);
oldBuffer.position(lastProcessedPosition);
nioInputBuffer.put(oldBuffer);
lastReadPosition = nioInputBuffer.position(); // fix for 45064
lastProcessedPosition = 0;
Buffers.releaseReceiveBuffer(oldBuffer, getStats());
}
}
