Using onClosing

Author: LikeTheSalad

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/connectivity/websocket/OkHttpWebSocket.java

@@ -83,6 +83,7 @@ public void onOpen(@Nonnull okhttp3.WebSocket webSocket, @Nonnull Response respo
     @Override
     public void onClosing(@Nonnull okhttp3.WebSocket webSocket, int code, @Nonnull String reason) {
       status.set(Status.CLOSING);
+      delegate.onClosing();
     }
 
     @Override

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/request/service/WebSocketRequestService.java

@@ -219,6 +219,11 @@ private void retryConnection() {
     startConnection();
   }
 
+  @Override
+  public void onClosing() {
+    // Noop
+  }
+
   @Override
   public void onClosed() {
     // If this service isn't stopped, we should retry connecting.

opamp-client/src/test/java/io/opentelemetry/opamp/client/internal/connectivity/websocket/OkHttpWebSocketTest.java

@@ -136,6 +136,7 @@ private void callOnClosed() {
 
   private void callOnClosing() {
     listenerCaptor.getValue().onClosing(mock(), 0, "");
+    verify(listener).onClosing();
   }
 
   private void callOnFailure() {