Update QNameFactory caching
[controller.git] / opendaylight / md-sal / sal-clustering-commons / src / main / java / org / opendaylight / controller / cluster / datastore / node / utils / QNameFactory.java
index 002b9ff..1b9a21f 100644 (file)
@@ -1,34 +1,34 @@
 /*
+ * Copyright (c) 2014, 2015 Cisco Systems, Inc. and others.  All rights reserved.
  *
- *  Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
- *
- *  This program and the accompanying materials are made available under the
- *  terms of the Eclipse Public License v1.0 which accompanies this distribution,
- *  and is available at http://www.eclipse.org/legal/epl-v10.html
- *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.controller.cluster.datastore.node.utils;
 
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
 import org.opendaylight.yangtools.yang.common.QName;
 
-import java.util.HashMap;
-import java.util.Map;
-
-public class QNameFactory {
-    private static final Map<String, QName> cache = new HashMap<>();
+public final class QNameFactory {
+    private static final int MAX_QNAME_CACHE_SIZE = Integer.getInteger(
+        "org.opendaylight.controller.cluster.datastore.node.utils.qname-cache.max-size", 10000);
 
-    public static QName create(String name){
-        QName value = cache.get(name);
-        if(value == null){
-            synchronized (cache){
-                value = cache.get(name);
-                if(value == null) {
-                    value = QName.create(name);
-                    cache.put(name, value);
+    private static final LoadingCache<String, QName> CACHE = CacheBuilder.newBuilder().maximumSize(MAX_QNAME_CACHE_SIZE)
+            .weakValues().build(new CacheLoader<String, QName>() {
+                @Override
+                public QName load(final String key) {
+                    return QName.create(key).intern();
                 }
-            }
-        }
-        return value;
+            });
+
+    private QNameFactory() {
+
+    }
+
+    public static QName create(final String name) {
+        return CACHE.getUnchecked(name);
     }
 }

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