Add entity lifercycle interceptor interface and add a entity listener.

Signed-off-by: SirWayne <dennis.melzer@bosch-si.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/model/EntityInterceptor.java

@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2015 Bosch Software Innovations GmbH and others.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.eclipse.hawkbit.repository.model;
+
+/**
+ * Interface for the entity interceptor lifecycle.
+ */
+public interface EntityInterceptor {
+
+    /**
+     * Callback for the {@link @PrePersist} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void prePersist(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PostPersist} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void postPersist(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PostRemove} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void postRemove(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PreRemove} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void preRemove(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PostLoad} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void postLoad(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PreUpdate} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void preUpdate(final Object entity) {
+    };
+
+    /**
+     * Callback for the {@link @PostUpdate} lifecycle event.
+     * 
+     * @param entity
+     *            the model entity
+     */
+    default void postUpdate(final Object entity) {
+    };
+
+}