Revert "remove redundant code under appc-common-bundle/java"

[appc.git] / appc-core / appc-common-bundle / java / org / onap / appc / cache / impl / LRUCache.java

diff --git a/appc-core/appc-common-bundle/java/org/onap/appc/cache/impl/LRUCache.java b/appc-core/appc-common-bundle/java/org/onap/appc/cache/impl/LRUCache.java
new file mode 100644 (file)
index 0000000..c88439c
--- /dev/null
+++ b/appc-core/appc-common-bundle/java/org/onap/appc/cache/impl/LRUCache.java
@@ -0,0 +1,58 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * 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.
+ * 
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.appc.cache.impl;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.onap.appc.cache.CacheStrategy;
+
+/**
+ * LRU cache implements CacheStategy<K, V>
+ * @param <K> Key
+ * @param <V> Value
+ */
+public class LRUCache<K,V> implements CacheStrategy<K,V> {
+
+    private Map<K,V> map;
+
+    LRUCache(final Integer capacity){
+        map = new LinkedHashMap<K,V>(capacity, 0.75F, true) {
+            @Override
+            protected boolean removeEldestEntry(Map.Entry<K, V> eldest){
+                return size() > capacity;
+            }
+        };
+    }
+
+    @Override
+    public V getObject(K key) {
+        return map.get(key);
+    }
+
+    @Override
+    public void putObject(K key, V value) {
+        map.put(key,value);
+    }
+}