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From simonetrip...@apache.org
Subject svn commit: r897960 - in /commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations: DigesterLoader.java utils/InMemoryLRUCache.java
Date Mon, 11 Jan 2010 17:31:33 GMT
Author: simonetripodi
Date: Mon Jan 11 17:31:32 2010
New Revision: 897960

URL: http://svn.apache.org/viewvc?rev=897960&view=rev
Log:
first checkin of InMemoryLRUCache
DigesterLoader stores RuleSet for visited classes on an InMemoryLRUCache instance

Added:
    commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java
  (with props)
Modified:
    commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/DigesterLoader.java

Modified: commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/DigesterLoader.java
URL: http://svn.apache.org/viewvc/commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/DigesterLoader.java?rev=897960&r1=897959&r2=897960&view=diff
==============================================================================
--- commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/DigesterLoader.java
(original)
+++ commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/DigesterLoader.java
Mon Jan 11 17:31:32 2010
@@ -21,13 +21,12 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.util.LinkedHashMap;
-import java.util.Map;
 
 import org.apache.commons.digester.Digester;
 import org.apache.commons.digester.RuleSet;
 import org.apache.commons.digester.annotations.reflect.MethodArgument;
 import org.apache.commons.digester.annotations.utils.AnnotationUtils;
+import org.apache.commons.digester.annotations.utils.InMemoryLRUCache;
 
 /**
  * This class manages the creation of Digester instances analyzing target classes
@@ -42,33 +41,11 @@
 public final class DigesterLoader {
 
     /**
-     * The fixed cache size.
-     */
-    private static final int CACHE_SIZE = 255;
-
-    /**
-     * The fixed cache load facor.
-     */
-    private static final float LOAD_FACTOR = 0.75f;
-
-    /**
-     * The fixed cache capacity.
-     */
-    private static final int CACHE_CAPACITY = (int) Math.ceil(CACHE_SIZE / LOAD_FACTOR) +
1;
-
-    /**
      * In-memory LRU cache that stores already analyzed classes and relative
      * {@link RuleSet}.
      */
-    private static final Map<Class<?>, FromAnnotationsRuleSet> CACHED_RULESET
=
-        new LinkedHashMap<Class<?>, FromAnnotationsRuleSet>(CACHE_CAPACITY, LOAD_FACTOR)
{
-
-            private static final long serialVersionUID = 1L;
-
-            protected boolean removeEldestEntry(Map.Entry<Class<?>,FromAnnotationsRuleSet>
eldest) {
-                return size() > CACHE_SIZE;
-            };
-    };
+    private static final InMemoryLRUCache<Class<?>, FromAnnotationsRuleSet> CACHED_RULESET
=
+        new InMemoryLRUCache<Class<?>, FromAnnotationsRuleSet>();
 
     /**
      * This class can't be instantiated.
@@ -178,9 +155,11 @@
     }
 
     /**
-     * 
-     * @param annotation
-     * @param element
+     * Handles the current visited element and related annotation, invoking the
+     * right handler putting the rule provider in the rule set.
+     *
+     * @param annotation the current visited annotation.
+     * @param element the current visited element.
      */
     private static void handle(Annotation annotation, AnnotatedElement element, FromAnnotationsRuleSet
ruleSet) {
         Class<?> annotationType = annotation.annotationType();

Added: commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java
URL: http://svn.apache.org/viewvc/commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java?rev=897960&view=auto
==============================================================================
--- commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java
(added)
+++ commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java
Mon Jan 11 17:31:32 2010
@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.commons.digester.annotations.utils;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Simple in-memory LRU cache implementation.
+ *
+ * @version $Id$
+ * @since 2.1
+ */
+public final class InMemoryLRUCache<K, V> {
+
+    /**
+     * The fixed cache size.
+     */
+    private static final int CACHE_SIZE = 255;
+
+    /**
+     * The fixed cache load facor.
+     */
+    private static final float LOAD_FACTOR = 0.75f;
+
+    /**
+     * The fixed cache capacity.
+     */
+    private static final int CACHE_CAPACITY = (int) Math.ceil(CACHE_SIZE / LOAD_FACTOR) +
1;
+
+    /**
+     * The map that implements the LRU cache.
+     */
+    private final Map<K, V> data = new LinkedHashMap<K, V>(CACHE_CAPACITY, LOAD_FACTOR)
{
+        /**
+         * This class serialVersionUID.
+         */
+        private static final long serialVersionUID = 1L;
+
+        /**
+         * {@inheritDoc}
+         */
+        protected boolean removeEldestEntry(Map.Entry<K,V> eldest) {
+            return size() > CACHE_SIZE;
+        }
+    };
+
+    /**
+     * Returns true if this cache contains a mapping for the specified key.
+     *
+     * @param key key whose presence in this map is to be tested.
+     * @return true if this map contains a mapping for the specified key, false
+     *         otherwise.
+     */
+    public boolean containsKey(K key) {
+        checkKey(key);
+        return this.data.containsKey(key);
+    }
+
+    /**
+     * Returns the value to which the specified key is cached, or null if this
+     * cache contains no mapping for the key.
+     *
+     * Key parameter must not be null.
+     *
+     * @param key the key has to be checked it is present, it must not be null.
+     * @return the value to which the specified key is cached, null if this
+     *         cache contains no mapping for the key.
+     */
+    public V get(K key) {
+        checkKey(key);
+        return this.data.get(key);
+    }
+
+    /**
+     * Associates the specified value with the specified key in this cache.
+     *
+     * Key parameter must not be null.
+     *
+     * @param key key with which the specified value is to be associated.
+     * @param value value to be associated with the specified key.
+     */
+    public void put(K key, V value) {
+        checkKey(key);
+        this.data.put(key, value);
+    }
+
+    /**
+     * Verify that a key is not null.
+     *
+     * @param <T> the generic key type.
+     * @param key the key object.
+     */
+    private static <T> void checkKey(T key) {
+        if (key == null) {
+            throw new IllegalArgumentException("null keys not supported");
+        }
+    }
+
+}

Propchange: commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/InMemoryLRUCache.java
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