fix some multi threading crashes, gui: implement popping of specific element

src/main/java/de/bixilon/minosoft/data/entities/meta/EntityData.kt

@@ -14,6 +14,7 @@
 package de.bixilon.minosoft.data.entities.meta
 
 import de.bixilon.kutil.cast.CastUtil.unsafeCast
+import de.bixilon.kutil.concurrent.lock.SimpleLock
 import de.bixilon.kutil.enums.EnumUtil
 import de.bixilon.kutil.enums.ValuesEnum
 import de.bixilon.minosoft.data.container.stack.ItemStack
@@ -39,6 +40,7 @@ import java.util.*
 class EntityData(
     val connection: PlayConnection,
 ) {
+    val lock = SimpleLock()
     val sets: EntityDataHashMap = EntityDataHashMap()
 
     override fun toString(): String {
@@ -57,7 +59,6 @@ class EntityData(
             EntityDataDataTypes.BOOLEAN -> buffer.readBoolean()
             EntityDataDataTypes.VEC3I -> Vec3i(buffer.readInt(), buffer.readInt(), buffer.readInt())
             EntityDataDataTypes.ITEM_STACK -> buffer.readItemStack()
-            EntityDataDataTypes.ITEM_STACK -> buffer.readItemStack()
             EntityDataDataTypes.ROTATION -> ArmorStandArmRotation(buffer.readFloat(), buffer.readFloat(), buffer.readFloat())
             EntityDataDataTypes.BLOCK_POSITION -> buffer.readBlockPosition()
             EntityDataDataTypes.OPT_CHAT -> buffer.readOptional { buffer.readChatComponent() }
@@ -109,15 +110,20 @@ class EntityData(
     inner class EntityDataHashMap : Int2ObjectOpenHashMap<Any>() {
 
         operator fun <K> get(field: EntityDataFields): K {
-            val index: Int = this@EntityData.connection.registries.getEntityMetaDataIndex(field) ?: return field.defaultValue.unsafeCast() // Can not find field.
-            get(index)?.let {
-                try {
-                    return it as K
-                } catch (exception: ClassCastException) {
-                    Log.log(LogMessageType.OTHER, level = LogLevels.WARN, message = exception)
+            lock.acquire()
+            try {
+                val index: Int = this@EntityData.connection.registries.getEntityMetaDataIndex(field) ?: return field.defaultValue.unsafeCast() // Can not find field.
+                get(index)?.let {
+                    try {
+                        return it as K
+                    } catch (exception: ClassCastException) {
+                        Log.log(LogMessageType.OTHER, level = LogLevels.WARN, message = exception)
+                    }
                 }
+                return field.defaultValue as K
+            } finally {
+                lock.release()
             }
-            return field.defaultValue as K
         }
 
         fun getPose(field: EntityDataFields): Poses? {

src/main/java/de/bixilon/minosoft/data/world/WorldEntities.kt

@@ -82,7 +82,7 @@ class WorldEntities : Iterable<Entity> {
 
     @Deprecated("ToDo: Lock")
     override fun iterator(): Iterator<Entity> {
-        return idEntityMap.toSynchronizedMap().values.iterator()
+        return uuidEntityMap.toSynchronizedMap().values.iterator()
     }
 
     fun getInRadius(position: Vec3d, distance: Double, check: (Entity) -> Boolean): List<Entity> {

src/main/java/de/bixilon/minosoft/gui/rendering/gui/gui/GUIManager.kt

@@ -243,7 +243,25 @@ class GUIManager(
     }
 
     fun pop(element: GUIElement) {
-        TODO("Not yet implemented")
+        if (elementOrder.isEmpty()) {
+            return
+        }
+
+        val index = elementOrder.indexOf(element)
+        if (index < 0) {
+            return
+        }
+        element.onClose()
+        elementOrder.removeAt(index)
+        if (index == 0) {
+            elementOrder.firstOrNull()?.onOpen()
+        }
+
+        if (elementOrder.isEmpty()) {
+            renderWindow.inputHandler.inputHandler = null
+            guiRenderer.popper.clear()
+            guiRenderer.dragged.element = null
+        }
     }
 
     fun pop() {

src/main/java/de/bixilon/minosoft/protocol/packets/s2c/play/entity/EntityDataS2CP.kt

@@ -30,7 +30,9 @@ class EntityDataS2CP(buffer: PlayInByteBuffer) : PlayS2CPacket {
     override fun handle(connection: PlayConnection) {
         val entity = connection.world.entities[entityId] ?: return
 
+        entity.data.lock.lock()
         entity.data.sets.putAll(data.sets)
+        entity.data.lock.unlock()
         connection.fireEvent(EntityDataChangeEvent(connection, this))
     }