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Mirror von https://github.com/PaperMC/Paper.git synchronisiert 2024-12-25 15:50:06 +01:00
Paper/src/main/java/net/minecraft/server/Vec3DPool.java
Mike Primm 8219081385 [Bleeding] Change Vec3DPool to a stack based pool
Avoid overhead of using an ArrayList and resizing it. Also allows for reuse
of objects in the pool during the same tick by explicitly releasing them
back to the pool. This allows for much better cache performance as well
as reduced cache footprint.
2012-08-19 09:50:57 -05:00

103 Zeilen
3.1 KiB
Java

package net.minecraft.server;
import java.util.ArrayList;
import java.util.List;
public class Vec3DPool {
private final int a;
private final int b;
// CraftBukkit start
// private final List c = new ArrayList();
private Vec3D freelist = null;
private Vec3D alloclist = null;
private Vec3D freelisthead = null;
private Vec3D alloclisthead = null;
private int total_size = 0;
private int hit;
private int miss;
// CraftBukkit end
private int d = 0;
private int e = 0;
private int f = 0;
public Vec3DPool(int i, int j) {
this.a = i;
this.b = j;
}
public final Vec3D create(double d0, double d1, double d2) { // CraftBukkit - add final
if (this.f == 0) return new Vec3D(d0, d1, d2); // CraftBukkit - don't pool objects indefinitely if thread doesn't adhere to contract
Vec3D vec3d;
if (this.freelist == null) { // CraftBukkit
vec3d = new Vec3D(d0, d1, d2);
this.total_size++; // CraftBukkit
} else {
// CraftBukkit start
vec3d = this.freelist;
this.freelist = vec3d.next;
// CraftBukkit end
vec3d.b(d0, d1, d2);
}
// CraftBukkit start
if (this.alloclist == null) {
this.alloclisthead = vec3d;
}
vec3d.next = this.alloclist; // add to allocated list
this.alloclist = vec3d;
// CraftBukkit end
++this.d;
return vec3d;
}
// CraftBukkit start - offer back vector (can save LOTS of unneeded bloat) - works about 90% of the time
public void release(Vec3D v) {
if (this.alloclist == v) {
this.alloclist = v.next; // Pop off alloc list
// Push on to free list
if (this.freelist == null) this.freelisthead = v;
v.next = this.freelist;
this.freelist = v;
this.d--;
}
}
// CraftBukkit end
public void a() {
if (this.d > this.e) {
this.e = this.d;
}
// CraftBukkit start - intelligent cache
// Take any allocated blocks and put them on free list
if (this.alloclist != null) {
if (this.freelist == null) {
this.freelist = this.alloclist;
this.freelisthead = this.alloclisthead;
}
else {
this.alloclisthead.next = this.freelist;
this.freelist = this.alloclist;
this.freelisthead = this.alloclisthead;
}
this.alloclist = null;
}
if ((this.f++ & 0xff) == 0) {
int newSize = total_size - (total_size >> 3);
if (newSize > this.e) { // newSize will be 87.5%, but if we were not in that range, we clear some of the cache
for (int i = total_size; i > newSize; i--) {
freelist = freelist.next;
}
total_size = newSize;
}
this.e = 0;
// this.f = 0; // We do not reset to zero; it doubles for a flag
}
// CraftBukkit end
this.d = 0;
}
}