From 4d44cf806ddfa8d051f2d6b1289fa3b67b0daf2e Mon Sep 17 00:00:00 2001
From: James Moger <james.moger@gitblit.com>
Date: Fri, 21 Oct 2011 17:00:07 -0400
Subject: Cache repository sizes and default metrics for performance boost

---
 src/com/gitblit/models/ObjectCache.java | 85 +++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/com/gitblit/models/ObjectCache.java

(limited to 'src/com/gitblit/models/ObjectCache.java')

diff --git a/src/com/gitblit/models/ObjectCache.java b/src/com/gitblit/models/ObjectCache.java
new file mode 100644
index 00000000..48ede90e
--- /dev/null
+++ b/src/com/gitblit/models/ObjectCache.java
@@ -0,0 +1,85 @@
+/*
+ * 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.models;
+
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Reusable object cache.
+ * 
+ * @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) {
+		return cache.get(name).object;
+	}
+
+	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 Object remove(String name) {
+		return cache.remove(name).object;
+	}
+}
-- 
cgit v1.2.3