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This commit is contained in:
Zoe Gidiere
2025-12-10 18:49:03 -07:00
parent ddc8cc7db5
commit dd2f0365b0
9 changed files with 107 additions and 20 deletions
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51
common/api/src/main/java/com/dfsek/terra/api/util/collection/TriStateIntCache.java Normal file
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@@ -0,0 +1,51 @@
package com.dfsek.terra.api.util.collection;
import java.util.concurrent.atomic.AtomicLongArray;
public class TriStateIntCache {
public static final long STATE_UNSET = 0L;
public static final long STATE_FALSE = 1L;
public static final long STATE_TRUE = 2L;
private static final long BIT_MASK = 3L;
private final AtomicLongArray data;
public TriStateIntCache(int maxKeySize) {
this.data = new AtomicLongArray((maxKeySize + 31) >>> 5);
}
/**
* Checks the cache state without any allocation.
* @return STATE_UNSET (0), STATE_FALSE (1), or STATE_TRUE (2)
*/
public long get(int key) {
int arrayIndex = key >>> 5;
int bitShift = (key & 31) << 1;
long currentWord = data.get(arrayIndex);
return (currentWord >>> bitShift) & BIT_MASK;
}
/**
* Sets the value safely. Handles race conditions internally.
*/
public void set(int key, boolean value) {
int arrayIndex = key >>> 5;
int bitShift = (key & 31) << 1;
long targetState = value ? STATE_TRUE : STATE_FALSE;
long currentWord, newWord;
do {
currentWord = data.get(arrayIndex);
// Race condition check:
long existingState = (currentWord >>> bitShift) & BIT_MASK;
if (existingState != STATE_UNSET) {
return; // Already set, abort our update
}
// Create new word with our bit set
newWord = (currentWord & ~(BIT_MASK << bitShift)) | (targetState << bitShift);
} while (!data.compareAndSet(arrayIndex, currentWord, newWord));
}
}

8
common/api/src/main/java/com/dfsek/terra/api/world/biome/Biome.java
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@@ -39,4 +39,12 @@ public interface Biome extends PropertyHolder, StringIdentifiable {
* @return A {@link Set} of String tags this biome holds.
*/
Set<String> getTags();
/**
* Get the numeric ID of this biome, generated at registration time
*
* @return The numeric ID.
*/
int getIntID();
}