[1.6.5] Use CopyOnWriteArrayList for (dis)connection listeners.

Signed-off-by: Jacob Glickman <[email protected]>

Author: Jacob Glickman

README.md

@@ -11,14 +11,14 @@ Maven:
 <dependency>
     <groupId>com.github.jhg023</groupId>
     <artifactId>SimpleNet</artifactId>
-    <version>1.6.4</version>
+    <version>1.6.5</version>
 </dependency>
 ```
 
 Gradle:
 
 ```groovy
-implementation 'com.github.jhg023:SimpleNet:1.6.4'
+implementation 'com.github.jhg023:SimpleNet:1.6.5'
 ```
 
  2. Because SimpleNet is compiled with Java 11, you must first require its module in your `module-info.java`:

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.github.jhg023</groupId>
     <artifactId>SimpleNet</artifactId>
-    <version>1.6.4</version>
+    <version>1.6.5</version>
 
     <name>SimpleNet</name>
     <description>An easy-to-use, event-driven, asynchronous, network application framework compiled with Java 11.</description>

src/main/java/com/github/simplenet/AbstractReceiver.java

@@ -23,8 +23,8 @@
  */
 package com.github.simplenet;
 
-import java.util.ArrayList;
 import java.util.Collection;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 abstract class AbstractReceiver<T> {
 
@@ -54,9 +54,9 @@ abstract class AbstractReceiver<T> {
      * Instantiates a new {@link AbstractReceiver} with a buffer capacity of {@code bufferSize}.
      */
     AbstractReceiver() {
-        this.connectListeners = new ArrayList<>(1);
-        this.preDisconnectListeners = new ArrayList<>(1);
-        this.postDisconnectListeners = new ArrayList<>(1);
+        this.connectListeners = new CopyOnWriteArrayList<>();
+        this.preDisconnectListeners = new CopyOnWriteArrayList<>();
+        this.postDisconnectListeners = new CopyOnWriteArrayList<>();
     }
 
     /**