Add o.s.g.cache.support.CacheWriterSupport interface extending org.apache.geode.cache.CacheWriter to facilitate the implementations of application CacheWriters.

The CacheWriterSupport compliments the o.s.g.cache.support.CacheLoaderSupport interface.

spring-geode/src/main/java/org/springframework/geode/cache/support/CacheWriterSupport.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2019 the original author or authors.
+ *
+ * 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
+ *
+ *     https://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.springframework.geode.cache.support;
+
+import org.apache.geode.cache.CacheWriter;
+import org.apache.geode.cache.CacheWriterException;
+import org.apache.geode.cache.EntryEvent;
+import org.apache.geode.cache.RegionEvent;
+
+/**
+ * Class supporting the implementation of Apache Geode / Pivotal GemFire (PCC) {@link CacheWriter CacheWriters}.
+ *
+ * @author John Blum
+ * @see org.apache.geode.cache.CacheWriter
+ * @since 1.1.0
+ */
+@SuppressWarnings("unused")
+public interface CacheWriterSupport<K, V> extends CacheWriter<K, V> {
+
+  @Override
+  default void beforeCreate(EntryEvent<K, V> event) throws CacheWriterException { }
+
+  @Override
+  default void beforeUpdate(EntryEvent<K, V> event) throws CacheWriterException { }
+
+  @Override
+  default void beforeDestroy(EntryEvent<K, V> event) throws CacheWriterException { }
+
+  @Override
+  default void beforeRegionClear(RegionEvent<K, V> event) throws CacheWriterException { }
+
+  @Override
+  default void beforeRegionDestroy(RegionEvent<K, V> event) throws CacheWriterException { }
+
+}