From f66e89662c091e082bd1d2feb6ac91513ccff273 Mon Sep 17 00:00:00 2001
From: Rafael Cavazin <rafaelcavazin@gmail.com>
Date: Sun, 21 Jul 2013 09:59:00 -0400
Subject: [PATCH] Merge branch 'master' of https://github.com/gitblit/gitblit
---
src/main/java/com/gitblit/utils/ObjectCache.java | 98 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 98 insertions(+), 0 deletions(-)
diff --git a/src/main/java/com/gitblit/utils/ObjectCache.java b/src/main/java/com/gitblit/utils/ObjectCache.java
new file mode 100644
index 0000000..692669f
--- /dev/null
+++ b/src/main/java/com/gitblit/utils/ObjectCache.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2011 gitblit.com.
+ *
+ * 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.
+ */
+package com.gitblit.utils;
+
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Reusable coarse date-based object cache. The date precision is in
+ * milliseconds and in fast, concurrent systems this cache is too simplistic.
+ * However, for the cases where its being used in Gitblit this cache technique
+ * is just fine.
+ *
+ * @author James Moger
+ *
+ */
+public class ObjectCache<X> implements Serializable {
+
+ private static final long serialVersionUID = 1L;
+
+ private final Map<String, CachedObject<X>> cache = new ConcurrentHashMap<String, CachedObject<X>>();
+
+ private class CachedObject<Y> {
+
+ public final String name;
+
+ private volatile Date date;
+
+ private volatile Y object;
+
+ CachedObject(String name) {
+ this.name = name;
+ date = new Date(0);
+ }
+
+ @Override
+ public String toString() {
+ return getClass().getSimpleName() + ": " + name;
+ }
+ }
+
+ public boolean hasCurrent(String name, Date date) {
+ return cache.containsKey(name) && cache.get(name).date.compareTo(date) == 0;
+ }
+
+ public Date getDate(String name) {
+ return cache.get(name).date;
+ }
+
+ public X getObject(String name) {
+ if (cache.containsKey(name)) {
+ return cache.get(name).object;
+ }
+ return null;
+ }
+
+ public void updateObject(String name, X object) {
+ this.updateObject(name, new Date(), object);
+ }
+
+ public void updateObject(String name, Date date, X object) {
+ CachedObject<X> obj;
+ if (cache.containsKey(name)) {
+ obj = cache.get(name);
+ } else {
+ obj = new CachedObject<X>(name);
+ cache.put(name, obj);
+ }
+ obj.date = date;
+ obj.object = object;
+ }
+
+ public X remove(String name) {
+ if (cache.containsKey(name)) {
+ return cache.remove(name).object;
+ }
+ return null;
+ }
+
+ public int size() {
+ return cache.size();
+ }
+}
--
Gitblit v1.9.1