Field synchronizer technical improvements

src/main/kotlin/ru/dbotthepony/mc/otm/network/FieldSynchronizer.kt

@@ -242,7 +242,8 @@ class FieldSynchronizer(private val callback: Runnable, private val alwaysCallCa
 		)
 	}
 
-	private val endpoints = ArrayList<WeakReference<Endpoint>>()
+	private var endpointsMaxCapacity = 1
+	private val endpoints = ArrayList<WeakReference<Endpoint>>(1)
 	val defaultEndpoint = Endpoint()
 
 	private var lastEndpointsCleanup = System.nanoTime()
@@ -270,17 +271,23 @@ class FieldSynchronizer(private val callback: Runnable, private val alwaysCallCa
 					execute.invoke(endpoint)
 				}
 			}
+
+			if (endpoints.size < endpointsMaxCapacity / 2) {
+				endpoints.trimToSize()
+				endpointsMaxCapacity = endpoints.size
+			}
 		}
 	}
 
 	inner class Endpoint {
 		init {
+			synchronized(endpoints) {
 				endpoints.add(WeakReference(this))
+				endpointsMaxCapacity = endpointsMaxCapacity.coerceAtLeast(endpoints.size)
 
 				if (System.nanoTime() - lastEndpointsCleanup >= 60_000_000_000) {
 					lastEndpointsCleanup = System.nanoTime()
 
-				synchronized(endpoints) {
 					val iterator = endpoints.listIterator()
 
 					for (value in iterator) {
@@ -288,6 +295,11 @@ class FieldSynchronizer(private val callback: Runnable, private val alwaysCallCa
 							iterator.remove()
 						}
 					}
+
+					if (endpoints.size < endpointsMaxCapacity / 2) {
+						endpoints.trimToSize()
+						endpointsMaxCapacity = endpoints.size
+					}
 				}
 			}
 		}
@@ -515,6 +527,7 @@ class FieldSynchronizer(private val callback: Runnable, private val alwaysCallCa
 			if (!isDirty && !codec.compare(remote, value)) {
 				notifyEndpoints(this)
 				isDirty = true
+				remote = codec.copy(value)
 			}
 		}
 
@@ -534,7 +547,6 @@ class FieldSynchronizer(private val callback: Runnable, private val alwaysCallCa
 			val value = value
 			codec.write(stream, value)
 			isDirty = false
-			remote = codec.copy(value)
 		}
 
 		override fun read(stream: DataInputStream) {