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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