Merge changes I0d797533,I128522af,I6dd076eb,Ief6f81b9,I83d01e5c
* changes: ObjectIdSubclassMap: Avoid field loads in inner loops ObjectIdSubclassMap: Manually inline index() ObjectIdSubclassMap: Change initial size to 2048 ObjectIdSubclassMap: Grow before insertions ObjectIdSubclassMap: Use & rather than % for hashing
This commit is contained in:
commit
42f0b11153
|
@ -63,19 +63,25 @@
|
|||
* type of subclass of ObjectId that will be stored in the map.
|
||||
*/
|
||||
public class ObjectIdSubclassMap<V extends ObjectId> implements Iterable<V> {
|
||||
private static final int INITIAL_TABLE_SIZE = 2048;
|
||||
|
||||
private int size;
|
||||
|
||||
private int grow;
|
||||
|
||||
private int mask;
|
||||
|
||||
private V[] table;
|
||||
|
||||
/** Create an empty map. */
|
||||
public ObjectIdSubclassMap() {
|
||||
table = createArray(32);
|
||||
initTable(INITIAL_TABLE_SIZE);
|
||||
}
|
||||
|
||||
/** Remove all entries from this map. */
|
||||
public void clear() {
|
||||
size = 0;
|
||||
table = createArray(32);
|
||||
initTable(INITIAL_TABLE_SIZE);
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -86,13 +92,15 @@ public void clear() {
|
|||
* @return the instance mapped to toFind, or null if no mapping exists.
|
||||
*/
|
||||
public V get(final AnyObjectId toFind) {
|
||||
int i = index(toFind);
|
||||
int i = toFind.w1 & mask;
|
||||
final V[] tbl = table;
|
||||
final int end = tbl.length;
|
||||
V obj;
|
||||
|
||||
while ((obj = table[i]) != null) {
|
||||
while ((obj = tbl[i]) != null) {
|
||||
if (AnyObjectId.equals(obj, toFind))
|
||||
return obj;
|
||||
if (++i == table.length)
|
||||
if (++i == end)
|
||||
i = 0;
|
||||
}
|
||||
return null;
|
||||
|
@ -123,10 +131,9 @@ public boolean contains(final AnyObjectId toFind) {
|
|||
* type of instance to store.
|
||||
*/
|
||||
public <Q extends V> void add(final Q newValue) {
|
||||
if (table.length - 1 <= size * 2)
|
||||
if (++size == grow)
|
||||
grow();
|
||||
insert(newValue);
|
||||
size++;
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -150,23 +157,24 @@ public <Q extends V> void add(final Q newValue) {
|
|||
* type of instance to store.
|
||||
*/
|
||||
public <Q extends V> V addIfAbsent(final Q newValue) {
|
||||
int i = index(newValue);
|
||||
int i = newValue.w1 & mask;
|
||||
final V[] tbl = table;
|
||||
final int end = tbl.length;
|
||||
V obj;
|
||||
|
||||
while ((obj = table[i]) != null) {
|
||||
while ((obj = tbl[i]) != null) {
|
||||
if (AnyObjectId.equals(obj, newValue))
|
||||
return obj;
|
||||
if (++i == table.length)
|
||||
if (++i == end)
|
||||
i = 0;
|
||||
}
|
||||
|
||||
if (table.length - 1 <= size * 2) {
|
||||
if (++size == grow) {
|
||||
grow();
|
||||
insert(newValue);
|
||||
} else {
|
||||
table[i] = newValue;
|
||||
tbl[i] = newValue;
|
||||
}
|
||||
size++;
|
||||
return newValue;
|
||||
}
|
||||
|
||||
|
@ -209,24 +217,22 @@ public void remove() {
|
|||
};
|
||||
}
|
||||
|
||||
private final int index(final AnyObjectId id) {
|
||||
return (id.w1 >>> 1) % table.length;
|
||||
}
|
||||
|
||||
private void insert(final V newValue) {
|
||||
int j = index(newValue);
|
||||
while (table[j] != null) {
|
||||
if (++j >= table.length)
|
||||
int j = newValue.w1 & mask;
|
||||
final V[] tbl = table;
|
||||
final int end = tbl.length;
|
||||
while (tbl[j] != null) {
|
||||
if (++j == end)
|
||||
j = 0;
|
||||
}
|
||||
table[j] = newValue;
|
||||
tbl[j] = newValue;
|
||||
}
|
||||
|
||||
private void grow() {
|
||||
final V[] oldTable = table;
|
||||
final int oldSize = table.length;
|
||||
|
||||
table = createArray(2 * oldSize);
|
||||
initTable(oldSize << 1);
|
||||
for (int i = 0; i < oldSize; i++) {
|
||||
final V obj = oldTable[i];
|
||||
if (obj != null)
|
||||
|
@ -234,6 +240,12 @@ private void grow() {
|
|||
}
|
||||
}
|
||||
|
||||
private void initTable(int sz) {
|
||||
grow = sz >> 1;
|
||||
mask = sz - 1;
|
||||
table = createArray(sz);
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
private final V[] createArray(final int sz) {
|
||||
return (V[]) new ObjectId[sz];
|
||||
|
|
Loading…
Reference in New Issue