feat: Cleanable interface (#493)

Author: olenagerasimova

asto-core/src/main/java/com/artipie/asto/misc/Cleanable.java

@@ -0,0 +1,25 @@
+/*
+ * The MIT License (MIT) Copyright (c) 2020-2022 artipie.com
+ * https://github.com/artipie/asto/LICENSE.txt
+ */
+package com.artipie.asto.misc;
+
+/**
+ * Cleanable interface to represent objects that can be cleaned/invalidated.
+ * @param <T> The key type.
+ * @since 1.16
+ */
+public interface Cleanable<T> {
+
+    /**
+     * Invalidate object by the specified key.
+     * @param key The key
+     */
+    void invalidate(T key);
+
+    /**
+     * Invalidate all.
+     */
+    void invalidateAll();
+
+}