diff options
| author | Andrew Branson <andrew.branson@cern.ch> | 2014-10-07 09:18:11 +0200 |
|---|---|---|
| committer | Andrew Branson <andrew.branson@cern.ch> | 2014-10-07 09:18:11 +0200 |
| commit | 0ed2c1124cf1b9e49a2ec1fa0126a8df09f9e758 (patch) | |
| tree | e3a56cee83865f8c703deb790c15d3e79e871a82 /src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java | |
| parent | 50aa8aaab42fa62267aa1ae6a6070013096f5082 (diff) | |
Repackage to org.cristalise
Diffstat (limited to 'src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java')
| -rw-r--r-- | src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java b/src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java new file mode 100644 index 0000000..e5d0252 --- /dev/null +++ b/src/main/java/org/cristalise/kernel/utils/DescriptionObjectCache.java @@ -0,0 +1,105 @@ +/**
+ * This file is part of the CRISTAL-iSE kernel.
+ * Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * http://www.fsf.org/licensing/licenses/lgpl.html
+ */
+/**
+ *
+ */
+package org.cristalise.kernel.utils;
+
+import org.cristalise.kernel.common.InvalidDataException;
+import org.cristalise.kernel.common.ObjectNotFoundException;
+import org.cristalise.kernel.entity.proxy.ItemProxy;
+import org.cristalise.kernel.entity.proxy.MemberSubscription;
+import org.cristalise.kernel.entity.proxy.ProxyObserver;
+import org.cristalise.kernel.persistency.ClusterStorage;
+import org.cristalise.kernel.persistency.outcome.Viewpoint;
+
+
+public abstract class DescriptionObjectCache<D extends DescriptionObject> {
+
+ SoftCache<String, CacheEntry<D>> cache = new SoftCache<String, CacheEntry<D>>();
+
+ public D get(String name, int version) throws ObjectNotFoundException, InvalidDataException {
+ D thisDef;
+ synchronized(cache) {
+ CacheEntry<D> thisDefEntry = cache.get(name+"_"+version);
+ if (thisDefEntry == null) {
+ Logger.msg(6, name+" v"+version+" not found in cache. Retrieving.");
+ ItemProxy defItem = LocalObjectLoader.loadLocalObjectDef(getDefRoot(), name);
+ thisDef = loadObject(name, version, defItem);
+ cache.put(name+"_"+version, new CacheEntry<D>(thisDef, defItem, this));
+ }
+ else {
+ Logger.msg(6, name+" v"+version+" found in cache.");
+ thisDef = thisDefEntry.def;
+ }
+ }
+ return thisDef;
+ }
+
+ public abstract String getDefRoot();
+
+ public abstract D loadObject(String name, int version, ItemProxy proxy) throws ObjectNotFoundException, InvalidDataException;
+
+ public void removeObject(String id) {
+ synchronized(cache) {
+ if (cache.keySet().contains(id)) {
+ Logger.msg(7, "ActDefCache: Removing activity def "+id+" from cache");
+ cache.remove(id);
+ }
+ }
+ }
+
+ public class CacheEntry<E extends DescriptionObject> implements ProxyObserver<Viewpoint> {
+ public String id;
+ public ItemProxy proxy;
+ public E def;
+ public DescriptionObjectCache<E> parent;
+ public CacheEntry(E def, ItemProxy proxy, DescriptionObjectCache<E> parent) {
+ this.id = def.getName()+"_"+def.getVersion();
+ this.def = def;
+ this.parent = parent;
+ this.proxy = proxy;
+ proxy.subscribe(new MemberSubscription<Viewpoint>(this, ClusterStorage.VIEWPOINT, false));
+ }
+ @Override
+ public void finalize() {
+ parent.removeObject(id);
+ proxy.unsubscribe(this);
+ }
+ @Override
+ public void add(Viewpoint contents) {
+ parent.removeObject(id);
+ }
+
+ @Override
+ public void remove(String oldId) {
+ parent.removeObject(oldId);
+ }
+
+ @Override
+ public String toString() {
+ return "Cache entry: "+id;
+ }
+ @Override
+ public void control(String control, String msg) {
+ }
+ }
+}
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