--- /dev/null
+/*
+ * Copyright (C) 2001, 2002 The Mir-coders group
+ *
+ * This file is part of Mir.
+ *
+ * Mir is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Mir is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mir; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * In addition, as a special exception, The Mir-coders gives permission to link
+ * the code of this program with the com.oreilly.servlet library, any library
+ * licensed under the Apache Software License, The Sun (tm) Java Advanced
+ * Imaging library (JAI), The Sun JIMI library (or with modified versions of
+ * the above that use the same license as the above), and distribute linked
+ * combinations including the two. You must obey the GNU General Public
+ * License in all respects for all of the code used other than the above
+ * mentioned libraries. If you modify this file, you may extend this exception
+ * to your version of the file, but you are not obligated to do so. If you do
+ * not wish to do so, delete this exception statement from your version.
+ */
+
+package mircoders.global;
+
+
+public class CacheKey {
+ public String type;
+ public String selector;
+
+ public CacheKey(String theType,String theSelector){
+ type=theType;
+ selector=theSelector;
+ }
+ public boolean equals(CacheKey aCacheKey){
+ if (aCacheKey.type.equals(type) && aCacheKey.selector.equals(selector))
+ return true;
+ else
+ return false;
+
+ }
+}
--- /dev/null
+/*\r
+ * Copyright (C) 2001, 2002 The Mir-coders group\r
+ *\r
+ * This file is part of Mir.\r
+ *\r
+ * Mir is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU General Public License as published by\r
+ * the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ *\r
+ * Mir is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
+ * GNU General Public License for more details.\r
+ *\r
+ * You should have received a copy of the GNU General Public License\r
+ * along with Mir; if not, write to the Free Software\r
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r
+ *\r
+ * In addition, as a special exception, The Mir-coders gives permission to link\r
+ * the code of this program with the com.oreilly.servlet library, any library\r
+ * licensed under the Apache Software License, The Sun (tm) Java Advanced\r
+ * Imaging library (JAI), The Sun JIMI library (or with modified versions of\r
+ * the above that use the same license as the above), and distribute linked\r
+ * combinations including the two. You must obey the GNU General Public\r
+ * License in all respects for all of the code used other than the above\r
+ * mentioned libraries. If you modify this file, you may extend this exception\r
+ * to your version of the file, but you are not obligated to do so. If you do\r
+ * not wish to do so, delete this exception statement from your version.\r
+ */\r
+\r
+package mircoders.global;\r
+\r
+\r
+import java.util.HashMap;\r
+import java.util.LinkedList;\r
+import java.util.Map;\r
+\r
+import mir.config.MirPropertiesConfiguration;\r
+import mir.config.MirPropertiesConfiguration.PropertiesConfigExc;\r
+import mir.log.LoggerWrapper;\r
+\r
+import mircoders.global.CacheKey;\r
+\r
+public class MRUCache {\r
+ private Map cache;\r
+ private LinkedList mruList;\r
+ private int cacheMaxItems;\r
+\r
+ private MirPropertiesConfiguration configuration;\r
+ private LoggerWrapper logger;\r
+ \r
+\r
+\r
+ public MRUCache() {\r
+ logger = new LoggerWrapper("Global.MRUCache");\r
+ try {\r
+ configuration = MirPropertiesConfiguration.instance();\r
+ }\r
+ catch (PropertiesConfigExc e) {\r
+ throw new RuntimeException("Can't get configuration: " + e.getMessage());\r
+ }\r
+ cacheMaxItems=Integer.parseInt(configuration.getString("Global.Cache.Items"));\r
+ cache = new HashMap();\r
+ mruList= new LinkedList();\r
+ \r
+ }\r
+\r
+ /**\r
+ * Checks if the cache has an object with the specified key \r
+ */\r
+\r
+ public boolean hasObject(CacheKey aCacheKey) {\r
+ synchronized (cache) {\r
+ return cache.containsKey(aCacheKey);\r
+ }\r
+ }\r
+ \r
+ /**\r
+ * Stores an object in the cache by placing it at the top of the\r
+ * list If the object is in the cache, it promotes it to the top of\r
+ * the list. If the object is not in the cache, it adds it to the\r
+ * top of the list, and then checks the max size of the cache versus\r
+ * the new size to see if it needs to remove the last element from\r
+ * the cache.\r
+ */\r
+\r
+ public void storeObject(CacheKey aCacheKey,Object data) {\r
+ synchronized (cache) {\r
+ if (! hasObject(aCacheKey)){\r
+ // add to the cache\r
+ cache.put(aCacheKey,data);\r
+ if (mruList.size() > cacheMaxItems){\r
+ removeObject((CacheKey) mruList.getLast());\r
+ }\r
+ }\r
+ mruList.remove(aCacheKey);\r
+ mruList.addFirst(aCacheKey);\r
+ }\r
+ } \r
+ \r
+ public void removeObject(CacheKey aCacheKey){\r
+ synchronized (cache) {\r
+ mruList.remove(aCacheKey);\r
+ cache.remove(aCacheKey);\r
+ }\r
+ }\r
+ \r
+ /**\r
+ * Moves requested item to front of cache\r
+ */\r
+\r
+ public Object getObject(CacheKey aCacheKey){\r
+ synchronized (cache) {\r
+ mruList.remove(aCacheKey);\r
+ mruList.addFirst(aCacheKey);\r
+ return cache.get(aCacheKey);\r
+ }\r
+ }\r
+}\r
+\r
+\r
+\r