// Read up to 'len' bytes of Value. Value should already be persisted to
// disk. A racing delete can trigger a failure where we get a null return,
// but no crash (although one could argue that a racing load&delete is a bug
// no matter what).
@Override
public byte[] load(Value v) {
long skip = 0;
Key k = v._key;
// Convert an arraylet chunk into a long-offset from the base file.
if (k._kb[0] == Key.ARRAYLET_CHUNK) {
skip = ValueArray.getChunkOffset(k); // The offset
k = ValueArray.getArrayKey(k); // From the base file key
}
if (k._kb[0] == Key.DVEC) {
skip = water.fvec.NFSFileVec.chunkOffset(k); // The offset
}
try {
FileInputStream s = null;
try {
s = new FileInputStream(getFileForKey(k));
FileChannel fc = s.getChannel();
fc.position(skip);
AutoBuffer ab = new AutoBuffer(fc, true, Value.NFS);
byte[] b = ab.getA1(v._max);
ab.close();
assert v.isPersisted();
return b;
} finally {
if (s != null) s.close();
}
} catch (IOException e) { // Broken disk / short-file???
H2O.ignore(e);
return null;
}
}
public static Compression guessCompressionMethod(byte [] bits){
AutoBuffer ab = new AutoBuffer(bits);
// Look for ZIP magic
if( bits.length > ZipFile.LOCHDR && ab.get4(0) == ZipFile.LOCSIG )
return Compression.ZIP;
if( bits.length > 2 && ab.get2(0) == GZIPInputStream.GZIP_MAGIC )
return Compression.GZIP;
return Compression.NONE;
}
@Override public IcedHashMap<K,V> read(AutoBuffer bb) {
int n = bb.get4();
for(int i = 0; i < n; ++i)
put(bb.<K>get(),bb.<V>get());
return this;
}
@Override public AutoBuffer write(AutoBuffer bb) {
bb.put4(size());
for(Map.Entry<K, V> e:entrySet())bb.put(e.getKey()).put(e.getValue());
return bb;
}
@Override public IcedArrayList<T> read(AutoBuffer bb) {
int n = bb.get4();
for(int i = 0; i < n; ++i)
add(bb.<T>get());
return this;
}
@Override public AutoBuffer write(AutoBuffer bb) {
bb.put4(size());
for(T t:this)
bb.put(t);
return bb;
}