prevent crashes on expiring map desync, dont spam logs

Spigot-Server-Patches/0372-Fix-major-memory-leaks-in-ExpiringMap.patch

@@ -1,4 +1,4 @@
-From 6a439506b07605dd8566c86b672d3ee955715b51 Mon Sep 17 00:00:00 2001
+From 36d303e9b7046708890efc99f68d8dbab88ce4ac Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Sun, 16 Sep 2018 00:00:16 -0400
 Subject: [PATCH] Fix major memory leaks in ExpiringMap
@@ -11,10 +11,10 @@ not run on every manipulation, and instead to run clean
 once per tick per expiring map.
 
 diff --git a/src/main/java/net/minecraft/server/ExpiringMap.java b/src/main/java/net/minecraft/server/ExpiringMap.java
-index 4006f5a69c..49021d29ee 100644
+index 4006f5a69c..08d41e8cf0 100644
 --- a/src/main/java/net/minecraft/server/ExpiringMap.java
 +++ b/src/main/java/net/minecraft/server/ExpiringMap.java
-@@ -6,25 +6,113 @@ import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+@@ -6,25 +6,120 @@ import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
  import it.unimi.dsi.fastutil.longs.Long2LongMap.Entry;
  import it.unimi.dsi.fastutil.objects.ObjectIterator;
  import java.util.Map;
@@ -116,10 +116,17 @@ index 4006f5a69c..49021d29ee 100644
 +    @Override
 +    public T compute(Long aLong, BiFunction<? super Long, ? super T, ? extends T> biFunction) {
 +        setAccess(aLong);
-+        return compute(aLong, biFunction);
++        return super.compute(aLong, biFunction);
++    }
++
++    @Override
++    public synchronized void clear() {
++        ttl.clear();
++        super.clear();
 +    }
 +
 +    private boolean registered = false;
++    private boolean hasLeaked = false;
 +
 +    // Break clean to its own method to be ticked
 +    synchronized boolean clean() {
@@ -136,16 +143,23 @@ index 4006f5a69c..49021d29ee 100644
                  break;
              }
  
-@@ -33,7 +121,18 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
+@@ -33,7 +128,25 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
                  objectiterator.remove();
              }
          }
 -
-+        if (this.ttl.size() != this.size()) {
++        int ttlSize = this.ttl.size();
-+            MinecraftServer.LOGGER.error("WARNING: ExpiringMap desync - Memory leak risk!");
++        int thisSize = this.size();
-+            for (Entry<T> entry : this.long2ObjectEntrySet()) {
++        if (ttlSize != thisSize) {
-+                ttl.putIfAbsent(entry.getLongKey(), now);
++            if (!hasLeaked) { // log once
++                hasLeaked = true;
++                MinecraftServer.LOGGER.warn("WARNING: ExpiringMap desync (" + ttlSize + ":" + thisSize + ")- Memory leak risk! We will recover from this, but this means there is still a bug. Please do not open an issue about this. Mention it in Discord (we don't need everyone reporting the same thing)");
 +            }
++            try {
++                for (Entry<T> entry : this.long2ObjectEntrySet()) {
++                    ttl.putIfAbsent(entry.getLongKey(), now);
++                }
++            } catch (Exception e) { } // Ignore any como's
 +        }
 +        if (isEmpty()) {
 +            registered = false;