protected long allocateCharChunk(final char[] src, final int start, final int length) {
assert (length < CHUNKED_THRESHOLD) : length;
final int reqlen = length + 1; // actual length is store in first char.
final long lpage;
if (((_cpointer & BLOCK_MASK) + reqlen) > DEFAULT_BLOCK_SIZE_L) {
// spanning pages is not allowed, allocate in next chunk.
lpage = (_cpointer >> BLOCK_SHIFT) + 1;
_cpointer = lpage * DEFAULT_BLOCK_SIZE_L;
} else {
lpage = _cpointer >> BLOCK_SHIFT;
}
final int page = (int) lpage;
if (page >= _cchunks.length) {
enlarge((int) (_cchunks.length * ENLARGE_PAGES_FACTOR));
}
if (_cchunks[page] == null) {
_cchunks[page] = new char[DEFAULT_BLOCK_SIZE];
}
final long lblock = _cpointer & BLOCK_MASK;
final int block = (int) lblock;
assert (length <= Character.MAX_VALUE) : length;
_cchunks[page][block] = (char) length;
System.arraycopy(src, start, _cchunks[page], block + 1, length);
final long index = _cpointer;
_cpointer += reqlen; // move ahead pointer
return chunkKey(index);
}
@Override
protected void enlarge(final int pages) {
++enlarged;
if (enlarged >= paging_threshold) {
try {
pagedOut();
} catch (IOException e) {
throw new IllegalStateException("page out failed", e);
}
paging_threshold = Math.max(2, (int) (paging_threshold * 0.8));
enlarged = 0;
}
super.enlarge(pages);
}