private byte[] readv(final long addr, boolean charChunk, SerializationContext serContext) {
SortedSet<Long> tails = serContext.textBufferAddresses().tailSet(addr);
int nPages = Math.min(tails.size(), 16); // minimum 16 MB
final long[] addrs;
if (nPages == 0) {
addrs = new long[] {addr};
} else {
addrs = new long[nPages];
int n = 0;
for (long l : tails) {
addrs[n++] = l;
if (n == nPages) {
break;
}
}
}
final byte[][] tmp;
try { // read from disk
tmp = _paged.readv(addrs);
} catch (IOException e) {
throw new IllegalStateException("read from disk failed", e);
}
for (int i = 1; i < nPages; i++) {
final long tmpAddr = addrs[i];
if ((tmpAddr & BIG_STRING_MASK) != 0L) { // is big string?
_cache.putIfAbsent(tmpAddr, tmp[i]);
} else {
char[] cc = decompress(compressor, tmp[i]);
_cache.putIfAbsent(tmpAddr, cc);
}
}
return tmp[0];
}
private byte[] prepareBigString(final int addr) {
assert ((addr & BIG_STRING_MASK) != 0L);
byte[] b = (byte[]) _cache.get(addr);
if (b == null) { // read from disk
if (_tranfered) {
b = readv(addr, false, _serContext);
} else {
b = read(addr);
}
assert (b != null) : "Illegal addr: " + addr;
_cache.putIfAbsent(addr, b);
}
return b;
}
private char[] prepareCharChunk(final int page) {
final long addr = chunkKey(page * DEFAULT_BLOCK_SIZE_L);
char[] cc = (char[]) _cache.get(addr);
if (cc == null) { // read from disk
final byte[] v;
if (_tranfered) {
v = readv(addr, true, _serContext);
} else {
v = read(addr);
}
assert (v != null)
: "Illegal addr: "
+ addr
+ ", page: "
+ page
+ ", ccwritten:"
+ ccwritten
+ ", lccwritten:"
+ lccwritten;
cc = decompress(compressor, v);
_cache.putIfAbsent(addr, cc);
}
return cc;
}