Reinstated an accidentally deleted class

core/src/main/java/org/axonframework/monitoring/NoOpMessageMonitorCallback.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2010-2016. Axon Framework
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.axonframework.monitoring;
+
+/**
+ * A NoOp MessageMonitor callback
+ *
+ * @author Marijn van Zelst
+ * @since 3.0
+ */
+public enum NoOpMessageMonitorCallback implements MessageMonitor.MonitorCallback {
+
+    INSTANCE;
+
+    @Override
+    public void reportSuccess() {
+    }
+
+    @Override
+    public void reportFailure(Throwable cause) {
+    }
+
+    @Override
+    public void reportIgnored() {
+
+    }
+}