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HHH-15138 Further simplify BoundedConcurrentHashMap by removing support for NONE eviction

This commit is contained in:
Sanne Grinovero 2022-03-23 15:35:16 +00:00
parent 04bfdd49ab
commit bee5bae7b6
1 changed files with 10 additions and 99 deletions
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109
hibernate-core/src/main/java/org/hibernate/internal/util/collections/BoundedConcurrentHashMap.java
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@ -106,24 +106,12 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
/* ---------------- Constants -------------- */
/**
* The default initial capacity for this table,
* used when not otherwise specified in a constructor.
*/
static final int DEFAULT_MAXIMUM_CAPACITY = 512;
/**
* The default load factor for this table, used when not
* otherwise specified in a constructor.
*/
static final float DEFAULT_LOAD_FACTOR = 0.75f;
/**
* The default concurrency level for this table, used when not
* otherwise specified in a constructor.
*/
static final int DEFAULT_CONCURRENCY_LEVEL = 16;
/**
* The maximum capacity, used if a higher value is implicitly
* specified by either of the constructors with arguments. MUST
@ -258,12 +246,6 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
}
public enum Eviction {
NONE {
@Override
public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
return new NullEvictionPolicy<>();
}
},
LRU {
@Override
public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
@ -345,47 +327,6 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
boolean thresholdExpired();
}
static class NullEvictionPolicy<K, V> implements EvictionPolicy<K, V> {
@Override
public void clear() {
// Do nothing.
}
@Override
public void execute() {
}
@Override
public boolean onEntryHit(HashEntry<K, V> e) {
return false;
}
@Override
public void onEntryMiss(HashEntry<K, V> e) {
}
@Override
public void onEntryRemove(HashEntry<K, V> e) {
// Do nothing.
}
@Override
public boolean thresholdExpired() {
return false;
}
@Override
public Eviction strategy() {
return Eviction.NONE;
}
@Override
public HashEntry<K, V> createNewEntry(K key, int hash, HashEntry<K, V> next, V value) {
return new HashEntry<>( key, hash, next, value );
}
}
static final class LRU<K, V> extends LinkedHashMap<HashEntry<K, V>, V> implements EvictionPolicy<K, V> {
private final ConcurrentLinkedQueue<HashEntry<K, V>> accessQueue;
@ -1333,9 +1274,7 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
lock();
try {
int c = count;
if ( c++ > threshold && eviction.strategy() == Eviction.NONE ) {
rehash();
}
c++;
HashEntry<K, V>[] tab = table;
int index = hash & tab.length - 1;
HashEntry<K, V> first = tab[index];
@ -1356,21 +1295,16 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
oldValue = null;
++modCount;
count = c; // write-volatile
if ( eviction.strategy() != Eviction.NONE ) {
if ( c > evictCap ) {
// remove entries;lower count
eviction.execute();
// re-read first
first = tab[index];
}
// add a new entry
tab[index] = eviction.createNewEntry( key, hash, first, value );
// notify a miss
eviction.onEntryMiss( tab[index] );
}
else {
tab[index] = eviction.createNewEntry( key, hash, first, value );
if ( c > evictCap ) {
// remove entries;lower count
eviction.execute();
// re-read first
first = tab[index];
}
// add a new entry
tab[index] = eviction.createNewEntry( key, hash, first, value );
// notify a miss
eviction.onEntryMiss( tab[index] );
}
return oldValue;
}
@ -1608,29 +1542,6 @@ public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
}
/**
* Creates a new, empty map with the specified maximum capacity, default concurrency
* level and LRU eviction policy.
*
* @param capacity is the upper bound capacity for the number of elements in this map
*
* @throws IllegalArgumentException if the initial capacity of
* elements is negative or the load factor is nonpositive
* @since 1.6
*/
public BoundedConcurrentHashMap(int capacity) {
this( capacity, DEFAULT_CONCURRENCY_LEVEL );
}
/**
* Creates a new, empty map with the default maximum capacity
*/
public BoundedConcurrentHashMap() {
this( DEFAULT_MAXIMUM_CAPACITY, DEFAULT_CONCURRENCY_LEVEL );
}
/**
* Returns {@code true} if this map contains no key-value mappings.
*
* @return {@code true} if this map contains no key-value mappings
*/
@Override