void directPut(final Bytes key, final Bytes value, int hash2) {
lock();
try {
hash2 = hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
directPutEntry(key, value, hash2);
return;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(key, tmpBytes)) continue;
final long keyLength = key.remaining();
tmpBytes.skip(keyLength);
appendValue(value);
return;
}
}
} finally {
unlock();
}
}
void directRemove(final Bytes keyBytes, int hash2) {
lock();
try {
hash2 = hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
return;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(keyBytes, tmpBytes)) continue;
final long keyLength =
align(keyBytes.remaining() + tmpBytes.position()); // includes the stop bit length.
tmpBytes.position(keyLength);
hashLookup.remove(hash2, pos);
decrementSize();
freeList.clear(pos);
if (pos < nextSet) nextSet = pos;
return;
}
}
} finally {
unlock();
}
}
/**
* implementation for map.containsKey(Key)
*
* @param keyBytes the key of the entry
* @param hash2 a hash code relating to the {@keyBytes} ( not the natural hash of {@keyBytes} )
* @return true if and entry for this key exists
*/
boolean containsKey(final DirectBytes keyBytes, final int hash2) {
lock();
try {
hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
return false;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(keyBytes, tmpBytes)) continue;
return true;
}
}
} finally {
unlock();
}
}
synchronized boolean remove(long hash, K key) {
int h = smallMap.startSearch(hash);
boolean found = false;
while (true) {
int pos = smallMap.nextPos();
if (pos < 0) {
break;
}
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key2 = getKey();
if (equals(key, key2)) {
usedSet.clear(pos);
smallMap.remove(h, pos);
found = true;
this.size--;
break;
}
}
K key2 = key instanceof CharSequence ? (K) key.toString() : key;
DirectStore remove = map.remove(key2);
if (remove == null) return found;
offHeapUsed -= remove.size();
remove.free();
this.size--;
return true;
}
public Entry<K, V> getNextEntry(K prevKey) {
try {
int pos;
if (prevKey == null) {
pos = smallMap.firstPos();
} else {
long hash = hasher.hash(prevKey);
pos = smallMap.nextDifferentHashNonEmptyPosition(hash);
}
while (true) {
if (pos < 0) {
return null;
} else {
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key = getKey();
if (prevKey == null || !equals(key, prevKey)) {
if (bytesMarshallable) {
V value = (V) NativeBytes.UNSAFE.allocateInstance(vClass);
((BytesMarshallable) value).readMarshallable(bytes);
return new SimpleEntry<K, V>(key, value);
} else {
V value = (V) bytes.readObject();
return new SimpleEntry<K, V>(key, value);
}
}
}
pos = smallMap.nextPos();
}
} catch (InstantiationException e) {
throw new AssertionError(e);
}
}
synchronized V get(long hash, K key, V value) {
smallMap.startSearch(hash);
while (true) {
int pos = smallMap.nextPos();
if (pos < 0) {
K key2 = key instanceof CharSequence ? (K) key.toString() : key;
final DirectStore store = map.get(key2);
if (store == null) return null;
bytes.storePositionAndSize(store, 0, store.size());
break;
} else {
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key2 = getKey();
if (equals(key, key2)) break;
}
}
if (bytesMarshallable) {
try {
V v = value == null ? (V) NativeBytes.UNSAFE.allocateInstance(vClass) : value;
((BytesMarshallable) v).readMarshallable(bytes);
return v;
} catch (InstantiationException e) {
throw new AssertionError(e);
}
}
return (V) bytes.readObject();
}
synchronized boolean containsKey(long hash, K key) {
smallMap.startSearch(hash);
while (true) {
int pos = smallMap.nextPos();
if (pos < 0) {
K key2 = key instanceof CharSequence ? (K) key.toString() : key;
return map.containsKey(key2);
}
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key2 = getKey();
if (equals(key, key2)) {
return true;
}
}
}
/**
* @param keyBytes
* @param value
* @param hash2
* @return
*/
V acquireEntry(DirectBytes keyBytes, V value, int hash2) {
value = createValueIfNull(value);
final int pos = nextFree();
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
final long keyLength = keyBytes.remaining();
tmpBytes.writeStopBit(keyLength);
tmpBytes.write(keyBytes);
if (value instanceof Byteable) {
Byteable byteable = (Byteable) value;
int length = byteable.maxSize();
tmpBytes.writeStopBit(length);
tmpBytes.position(align(tmpBytes.position()));
if (length > tmpBytes.remaining())
throw new IllegalStateException(
"Not enough space left in entry for value, needs "
+ length
+ " but only "
+ tmpBytes.remaining()
+ " left");
tmpBytes.zeroOut(tmpBytes.position(), tmpBytes.position() + length);
byteable.bytes(bytes, offset + tmpBytes.position());
} else {
appendInstance(keyBytes, value);
}
// add to index if successful.
hashLookup.put(hash2, pos);
incrementSize();
return value;
}
void directPutEntry(Bytes keyBytes, Bytes value, int hash2) {
final int pos = nextFree();
final long offset = entriesOffset + pos * entrySize;
writeKey(keyBytes, offset);
appendValue(value);
// add to index if successful.
hashLookup.put(hash2, pos);
incrementSize();
}
void clear() {
usedSet.clear();
smallMap.clear();
for (DirectStore directStore : map.values()) {
directStore.free();
}
map.clear();
size = 0;
}
/**
* implementation for map.put(Key,Value)
*
* @param keyBytes
* @param value
* @param hash2 a hash code relating to the {@keyBytes} ( not the natural hash of {@keyBytes} )
* @param replaceIfPresent
* @return
*/
V put(final DirectBytes keyBytes, final V value, int hash2, boolean replaceIfPresent) {
lock();
try {
hash2 = hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
putEntry(keyBytes, value, hash2);
return null;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(keyBytes, tmpBytes)) continue;
final long keyLength = keyBytes.remaining();
tmpBytes.skip(keyLength);
if (replaceIfPresent) {
if (putReturnsNull) {
appendInstance(keyBytes, value);
return null;
}
long valuePosition = tmpBytes.position();
tmpBytes.readStopBit();
final long alignPosition = align(tmpBytes.position());
tmpBytes.position(alignPosition);
final V v = readObjectUsing(null, offset + alignPosition);
tmpBytes.position(valuePosition);
appendInstance(keyBytes, value);
return v;
} else {
if (putReturnsNull) {
return null;
}
return readObjectUsing(null, offset + keyLength);
}
}
}
} finally {
unlock();
}
}
/**
* implementation for map.replace(Key,Value) and map.replace(Key,Old,New)
*
* @param keyBytes the key of the entry to be replaced
* @param expectedValue the expected value to replaced
* @param newValue the new value that will only be set if the existing value in the map equals
* the {@param expectedValue} or {@param expectedValue} is null
* @param hash2 a hash code relating to the {@keyBytes} ( not the natural hash of {@keyBytes} )
* @return null if the value was not replaced, else the value that is replaced is returned
*/
V replace(
final DirectBytes keyBytes, final V expectedValue, final V newValue, final int hash2) {
lock();
try {
hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
return null;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(keyBytes, tmpBytes)) continue;
final long keyLength = keyBytes.remaining();
tmpBytes.skip(keyLength);
long valuePosition = tmpBytes.position();
tmpBytes.readStopBit();
final long alignPosition = align(tmpBytes.position());
tmpBytes.position(alignPosition);
final V valueRead = readObjectUsing(null, offset + keyLength);
if (valueRead == null) return null;
if (expectedValue == null || expectedValue.equals(valueRead)) {
tmpBytes.position(valuePosition);
appendInstance(keyBytes, newValue);
}
return valueRead;
}
}
} finally {
unlock();
}
}
public K getNextKey(K prevKey) {
int pos;
if (prevKey == null) {
pos = smallMap.firstPos();
} else {
long hash = hasher.hash(prevKey);
pos = smallMap.nextDifferentHashNonEmptyPosition(hash);
}
while (true) {
if (pos < 0) {
return null;
} else {
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key = getKey();
if (prevKey == null || !equals(key, prevKey)) {
return key;
}
}
pos = smallMap.nextPos();
}
}
/**
* implementation for map.remove(Key,Value)
*
* @param keyBytes the key of the entry to remove
* @param expectedValue the entry will only be removed if the {@param existingValue} equals null
* or the {@param existingValue} equals that of the entry.value
* @param hash2 a hash code relating to the {@keyBytes} ( not the natural hash of {@keyBytes} )
* @return
*/
V remove(final DirectBytes keyBytes, final V expectedValue, int hash2) {
lock();
try {
hash2 = hashLookup.startSearch(hash2);
while (true) {
final int pos = hashLookup.nextPos();
if (pos < 0) {
return null;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
if (!keyEquals(keyBytes, tmpBytes)) continue;
final long keyLength =
align(keyBytes.remaining() + tmpBytes.position()); // includes the stop bit length.
tmpBytes.position(keyLength);
V valueRemoved =
expectedValue == null && removeReturnsNull
? null
: readObjectUsing(null, offset + keyLength);
if (expectedValue != null && !expectedValue.equals(valueRemoved)) return null;
hashLookup.remove(hash2, pos);
decrementSize();
freeList.clear(pos);
if (pos < nextSet) nextSet = pos;
return valueRemoved;
}
}
} finally {
unlock();
}
}
/**
* used to acquire and object of type V from the map,
*
* <p>when {@param create }== true, this method is equivalent to :
*
* <pre>
* Object value = map.get("Key");
*
* if ( counter == null ) {
* value = new Object();
* map.put("Key", value);
* }
*
* return value;
* </pre>
*
* @param keyBytes the key of the entry
* @param value an object to be reused, null creates a new object.
* @param hash2 a hash code relating to the {@keyBytes} ( not the natural hash of {@keyBytes} )
* @param create false - if the {@keyBytes} can not be found null will be returned, true - if
* the {@keyBytes} can not be found an value will be acquired
* @return an entry.value whose entry.key equals {@param keyBytes}
*/
V acquire(DirectBytes keyBytes, V value, int hash2, boolean create) {
lock();
try {
hash2 = hashLookup.startSearch(hash2);
while (true) {
int pos = hashLookup.nextPos();
if (pos < 0) {
return create ? acquireEntry(keyBytes, value, hash2) : null;
} else {
final long offset = entriesOffset + pos * entrySize;
tmpBytes.storePositionAndSize(bytes, offset, entrySize);
final boolean miss;
if (LOGGER.isLoggable(Level.FINE)) {
final long start0 = System.nanoTime();
miss = !keyEquals(keyBytes, tmpBytes);
final long time0 = System.nanoTime() - start0;
if (time0 > 1e6) LOGGER.fine("startsWith took " + time0 / 100000 / 10.0 + " ms.");
} else {
miss = !keyEquals(keyBytes, tmpBytes);
}
if (miss) continue;
long valueLengthOffset = keyBytes.remaining() + tmpBytes.position();
tmpBytes.position(valueLengthOffset);
// skip the value length
// todo use the value length to limit reading below
long valueLength = tmpBytes.readStopBit();
final long valueOffset = align(tmpBytes.position()); // includes the stop bit length.
tmpBytes.position(valueOffset);
return readObjectUsing(value, offset + valueOffset);
}
}
} finally {
unlock();
}
}
synchronized void put(long hash, K key, V value, boolean ifPresent, boolean ifAbsent) {
// search for the previous entry
int h = smallMap.startSearch(hash);
boolean foundSmall = false, foundLarge = false;
while (true) {
int pos = smallMap.nextPos();
if (pos < 0) {
K key2 = key instanceof CharSequence ? (K) key.toString() : key;
final DirectStore store = map.get(key2);
if (store == null) {
if (ifPresent && !ifAbsent) return;
break;
}
if (ifAbsent) return;
bytes.storePositionAndSize(store, 0, store.size());
foundLarge = true;
break;
} else {
bytes.storePositionAndSize(store, pos * smallEntrySize, smallEntrySize);
K key2 = getKey();
if (equals(key, key2)) {
if (ifAbsent && !ifPresent) return;
foundSmall = true;
break;
}
}
}
tmpBytes.clear();
if (csKey)
//noinspection ConstantConditions
tmpBytes.writeUTFΔ((CharSequence) key);
else tmpBytes.writeObject(key);
long startOfValuePos = tmpBytes.position();
if (bytesMarshallable) ((BytesMarshallable) value).writeMarshallable(tmpBytes);
else tmpBytes.writeObject(value);
long size = tmpBytes.position();
if (size <= smallEntrySize) {
if (foundSmall) {
bytes.position(0);
bytes.write(tmpBytes, 0, size);
return;
} else if (foundLarge) {
remove(hash, key);
}
// look for a free spot.
int position = h & (entriesPerSegment - 1);
int free = usedSet.nextClearBit(position);
if (free >= entriesPerSegment) free = usedSet.nextClearBit(0);
if (free < entriesPerSegment) {
bytes.storePositionAndSize(store, free * smallEntrySize, smallEntrySize);
bytes.write(tmpBytes, 0, size);
smallMap.put(h, free);
usedSet.set(free);
this.size++;
return;
}
}
if (foundSmall) {
remove(hash, key);
} else if (foundLarge) {
// can it be reused.
if (bytes.capacity() <= size || bytes.capacity() - size < (size >> 3)) {
bytes.write(tmpBytes, startOfValuePos, size);
return;
}
remove(hash, key);
}
size = size - startOfValuePos;
DirectStore store = new DirectStore(bmf, size);
bytes.storePositionAndSize(store, 0, size);
bytes.write(tmpBytes, startOfValuePos, size);
K key2 = key instanceof CharSequence ? (K) key.toString() : key;
map.put(key2, store);
offHeapUsed += size;
this.size++;
}
