Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics / src / org / simantics / internal / TimedSessionCache.java

diff --git a/bundles/org.simantics/src/org/simantics/internal/TimedSessionCache.java b/bundles/org.simantics/src/org/simantics/internal/TimedSessionCache.java
new file mode 100644 (file)
index 0000000..7b764e7
--- /dev/null
+++ b/bundles/org.simantics/src/org/simantics/internal/TimedSessionCache.java
@@ -0,0 +1,83 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.internal;\r
+\r
+import java.util.Hashtable;\r
+\r
+import org.osgi.framework.BundleContext;\r
+import org.osgi.framework.ServiceRegistration;\r
+import org.simantics.db.Disposable;\r
+import org.simantics.db.management.ISessionContext;\r
+import org.simantics.utils.datastructures.cache.SoftTimedCache;\r
+import org.simantics.utils.datastructures.disposable.IDisposable;\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class TimedSessionCache extends SoftTimedCache</*ServerAddress*/Object, ISessionContext> {\r
+\r
+    private static ServiceRegistration<?> service       = null;\r
+    private static BundleContext          bundleContext = null;\r
+    private static boolean                disposed      = false;\r
+\r
+    TimedSessionCache() {\r
+        super("Database Session Cache Timer");\r
+    }\r
+\r
+    /**\r
+     * Invoked by the bundle activator to initialize the cache service.\r
+     * \r
+     * @param context the bundle context to register the service with\r
+     */\r
+    @SuppressWarnings({ "unchecked", "rawtypes" })\r
+    public synchronized static void initialize(BundleContext context) {\r
+        bundleContext = context;\r
+        service = context.registerService(TimedSessionCache.class.getName(), new TimedSessionCache(), new Hashtable());\r
+        disposed = false;\r
+    }\r
+\r
+    /**\r
+     * Invoked by the bundle activator to close the cache service.\r
+     */\r
+    public synchronized static void close() {\r
+        if (service != null) {\r
+            TimedSessionCache cache = getCache();\r
+            cache.clear();\r
+            \r
+            service.unregister();\r
+            service = null;\r
+            disposed = true;\r
+        }\r
+        bundleContext = null;\r
+    }\r
+\r
+    public static synchronized TimedSessionCache getCache() {\r
+        if (disposed)\r
+            throw new IllegalStateException("cache service is disposed");\r
+        if (service == null)\r
+            throw new IllegalStateException("cache service not initialized");\r
+        return (TimedSessionCache) bundleContext.getService(service.getReference());\r
+    }\r
+\r
+    @Override\r
+    protected void disposeValue(ISessionContext v) {\r
+        super.disposeValue(v);\r
+        // Implementing Disposable allows immediate disposal of the value\r
+        // object instead of leaving the disposal up to garbage\r
+        // collection and finalization.\r
+        if (v instanceof IDisposable) {\r
+            ((IDisposable) v).safeDispose();\r
+        } else if (v instanceof Disposable) {\r
+            ((Disposable) v).dispose();\r
+        }\r
+    }\r
+\r
+}\r