Use a ThreadLocal SimpleDateFormat for CriterionProgress deserialization

patches/server/0152-PaperPR-Apply-advancements-async.patch

@@ -16,6 +16,40 @@ index eaa1063ff2..a3b89a4f2a 100644
      public void a(EntityPlayer entityplayer) {
          this.player = entityplayer;
      }
+diff --git a/src/main/java/net/minecraft/server/CriterionProgress.java b/src/main/java/net/minecraft/server/CriterionProgress.java
+index 98c3884f47..244b58a7c4 100644
+--- a/src/main/java/net/minecraft/server/CriterionProgress.java
++++ b/src/main/java/net/minecraft/server/CriterionProgress.java
+@@ -10,8 +10,9 @@ import java.util.Date;
+ 
+ public class CriterionProgress {
+ 
+-    private static final SimpleDateFormat a = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");
+-    private Date b;
++    private static final SimpleDateFormat a = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z"); // Paper - diff on change
++    private static final ThreadLocal<SimpleDateFormat> THREAD_LOCAL_FORMATTER = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z")); // Paper - async advancements - SimpleDateFormat is not thread safe
++    private Date b; private void setDate(Date date) { this.b = date; } // Paper - OBFHELPER
+ 
+     public CriterionProgress() {}
+ 
+@@ -44,7 +45,7 @@ public class CriterionProgress {
+     }
+ 
+     public JsonElement e() {
+-        return (JsonElement) (this.b != null ? new JsonPrimitive(CriterionProgress.a.format(this.b)) : JsonNull.INSTANCE);
++        return this.getDate() != null ? new JsonPrimitive(THREAD_LOCAL_FORMATTER.get().format(this.getDate())) : JsonNull.INSTANCE; // Paper
+     }
+ 
+     public static CriterionProgress b(PacketDataSerializer packetdataserializer) {
+@@ -61,7 +62,7 @@ public class CriterionProgress {
+         CriterionProgress criterionprogress = new CriterionProgress();
+ 
+         try {
+-            criterionprogress.b = CriterionProgress.a.parse(s);
++            criterionprogress.setDate(THREAD_LOCAL_FORMATTER.get().parse(s)); // Paper
+             return criterionprogress;
+         } catch (ParseException parseexception) {
+             throw new JsonSyntaxException("Invalid datetime: " + s, parseexception);
 diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
 index 50ea875a3b..cc6a54e06a 100644
 --- a/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -89,7 +123,7 @@ index fd75444cec..95d93cd8e5 100644
          return this.convertable.getWorldFolder(savedfile);
      }
 diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
-index 7b385eb43e..3f634a266f 100644
+index 7b385eb43e..eae19141e3 100644
 --- a/src/main/java/net/minecraft/server/PlayerList.java
 +++ b/src/main/java/net/minecraft/server/PlayerList.java
 @@ -1339,9 +1339,26 @@ public abstract class PlayerList {
@@ -108,7 +142,7 @@ index 7b385eb43e..3f634a266f 100644
 +        final File file1 = new File(file, uuid + ".json");
 +        return java.util.concurrent.CompletableFuture.supplyAsync(
 +            () -> new AdvancementDataPlayer(this.server.getDataFixer(), this, this.server.getAdvancementData(), file1, entityPlayer),
-+            server.executorService
++            this.server.executorService
 +        );
 +    }
 +    // Paper end