EpicKnarvik97/PlotSquared
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fix: use soft/weak references when caching bukkit/P2 worlds

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- Fixes #4435
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dordsor21 2024-06-01 15:40:33 +01:00
parent 4839a83279
commit 7f61879370
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GPG Key ID: 1E53E88969FFCF0B
1 changed files with 20 additions and 10 deletions
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30
Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java
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@ -23,11 +23,15 @@ import com.plotsquared.core.location.World;
import org.bukkit.Bukkit; import org.bukkit.Bukkit;
import org.checkerframework.checker.nullness.qual.NonNull; import org.checkerframework.checker.nullness.qual.NonNull;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.util.Map; import java.util.Map;
public class BukkitWorld implements World<org.bukkit.World> { public class BukkitWorld implements World<org.bukkit.World> {
private static final Map<String, BukkitWorld> worldMap = Maps.newHashMap(); // Upon world unload we should probably have the P2 BukkitWorld be GCed relatively eagerly, thus freeing the bukkit world.
// We also want to avoid circumstances where a bukkit world has been GCed, but a P2 BukkitWorld has not
private static final Map<String, WeakReference<BukkitWorld>> worldMap = Maps.newHashMap();
private static final boolean HAS_MIN_Y; private static final boolean HAS_MIN_Y;
static { static {
@ -41,10 +45,11 @@ public class BukkitWorld implements World<org.bukkit.World> {
HAS_MIN_Y = temp; HAS_MIN_Y = temp;
} }
private final org.bukkit.World world; // We want to allow GC to remove bukkit worlds, but not too eagerly
private final SoftReference<org.bukkit.World> world;
private BukkitWorld(final org.bukkit.World world) { private BukkitWorld(final org.bukkit.World world) {
this.world = world; this.world = new SoftReference<>(world);
} }
/** /**
@ -68,12 +73,13 @@ public class BukkitWorld implements World<org.bukkit.World> {
* @return World instance * @return World instance
*/ */
public static @NonNull BukkitWorld of(final org.bukkit.World world) { public static @NonNull BukkitWorld of(final org.bukkit.World world) {
BukkitWorld bukkitWorld = worldMap.get(world.getName()); WeakReference<BukkitWorld> bukkitWorldRef = worldMap.get(world.getName());
if (bukkitWorld != null && bukkitWorld.getPlatformWorld().equals(world)) { BukkitWorld bukkitWorld;
if ((bukkitWorld = bukkitWorldRef.get()) != null && world.equals(bukkitWorld.world.get())) {
return bukkitWorld; return bukkitWorld;
} }
bukkitWorld = new BukkitWorld(world); bukkitWorld = new BukkitWorld(world);
worldMap.put(world.getName(), bukkitWorld); worldMap.put(world.getName(), new WeakReference<>(bukkitWorld));
return bukkitWorld; return bukkitWorld;
} }
@ -97,22 +103,26 @@ public class BukkitWorld implements World<org.bukkit.World> {
@Override @Override
public org.bukkit.World getPlatformWorld() { public org.bukkit.World getPlatformWorld() {
return this.world; org.bukkit.World world = this.world.get();
if (world == null) {
throw new IllegalStateException("Bukkit platform world was unloaded from memory");
}
return world;
} }
@Override @Override
public @NonNull String getName() { public @NonNull String getName() {
return this.world.getName(); return this.getPlatformWorld().getName();
} }
@Override @Override
public int getMinHeight() { public int getMinHeight() {
return getMinWorldHeight(world); return getMinWorldHeight(getPlatformWorld());
} }
@Override @Override
public int getMaxHeight() { public int getMaxHeight() {
return getMaxWorldHeight(world) - 1; return getMaxWorldHeight(getPlatformWorld()) - 1;
} }
@Override @Override