1 files changed, 70 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M3-RC5/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/CachedProxy.java b/tags/java/sca/2.0-M3-RC5/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/CachedProxy.java
new file mode 100644
index 0000000000..8c8f001eb9
--- /dev/null
+++ b/tags/java/sca/2.0-M3-RC5/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/CachedProxy.java
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.tuscany.sca.core.invocation;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Proxy;
+import java.util.WeakHashMap;
+
+public class CachedProxy extends Proxy {
+    private static final long serialVersionUID = 783519311852563060L;
+
+    protected CachedProxy(InvocationHandler handler) {
+        super(handler);
+    }
+
+    // This is a cache containing the proxy class constructor for each business interface.
+    // This improves performance compared to calling Proxy.newProxyInstance()
+    // every time that a proxy is needed.
+    private final static WeakHashMap<Class<?>, Constructor<?>> cache = new WeakHashMap<Class<?>, Constructor<?>>();
+
+    public static Object newProxyInstance(ClassLoader classloader, Class<?> aclass[], InvocationHandler invocationhandler)
+        throws IllegalArgumentException {
+        try {
+            if (invocationhandler == null)
+                throw new NullPointerException();
+            // Lookup cached constructor.  aclass[0] is the reference's business interface.
+            Constructor<?> proxyCTOR;
+            synchronized (cache) {
+                proxyCTOR = cache.get(aclass[0]);
+            }
+            if (proxyCTOR == null) {
+                Class<?> proxyClass = getProxyClass(classloader, aclass);
+                proxyCTOR = proxyClass.getConstructor(constructorParams);
+                synchronized (cache) {
+                    cache.put(aclass[0], proxyCTOR);
+                }
+            }
+            return proxyCTOR.newInstance(new Object[] {invocationhandler});
+        } catch (NoSuchMethodException e) {
+            throw new InternalError(e.toString());
+        } catch (IllegalAccessException e) {
+            throw new InternalError(e.toString());
+        } catch (InstantiationException e) {
+            throw new InternalError(e.toString());
+        } catch (InvocationTargetException e) {
+            throw new InternalError(e.toString());
+        }
+    }
+
+    private static final Class<?> constructorParams[] = {InvocationHandler.class};
+
+}