1 files changed, 150 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/corba/DynamicStubClassLoader.java b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/corba/DynamicStubClassLoader.java
new file mode 100644
index 0000000000..82554a1c8f
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/corba/DynamicStubClassLoader.java
@@ -0,0 +1,150 @@
+/*
+ * 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.binding.ejb.corba;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+import javax.rmi.CORBA.Stub;
+
+import net.sf.cglib.core.NamingPolicy;
+import net.sf.cglib.core.Predicate;
+import net.sf.cglib.proxy.Callback;
+import net.sf.cglib.proxy.CallbackFilter;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.FixedValue;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.NoOp;
+
+/**
+ * @version $Revision$ $Date$
+ */
+public class DynamicStubClassLoader extends ClassLoader {
+    private static final String PACKAGE_PREFIX = "org.omg.stub.";
+
+    @Override
+    public synchronized Class loadClass(final String name) throws ClassNotFoundException {
+        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+
+        // check if the stub already exists first
+        try {
+            return classLoader.loadClass(name);
+        } catch (ClassNotFoundException e) {
+        }
+
+        // if this is not a class from the org.omg.stub name space don't attempt to generate
+        if (!name.startsWith(PACKAGE_PREFIX)) {
+            throw new ClassNotFoundException("Could not load class: " + name);
+        }
+
+        // load the interfaces class we are attempting to create a stub for
+        Class iface = loadStubInterfaceClass(name, classLoader);
+
+        // create the stub builder
+        try {
+            Enhancer enhancer = new Enhancer();
+            enhancer.setSuperclass(Stub.class);
+            enhancer.setInterfaces(new Class[] {iface});
+            enhancer.setCallbackFilter(FILTER);
+            enhancer.setCallbackTypes(new Class[] {NoOp.class, MethodInterceptor.class, FixedValue.class});
+            enhancer.setUseFactory(false);
+            enhancer.setClassLoader(classLoader);
+            enhancer.setNamingPolicy(new NamingPolicy() {
+                public String getClassName(String s, String s1, Object o, Predicate predicate) {
+                    return name;
+                }
+            });
+
+            // generate the class
+            Class result = enhancer.createClass();
+            assert result != null;
+
+            StubMethodInterceptor interceptor = new StubMethodInterceptor(iface);
+            Ids ids = new Ids(iface);
+            Enhancer.registerStaticCallbacks(result, new Callback[] {NoOp.INSTANCE, interceptor, ids});
+
+            return result;
+        } catch (RuntimeException e) {
+            throw e;
+        } catch (Error e) {
+            throw e;
+        }
+    }
+
+    private Class loadStubInterfaceClass(String name, ClassLoader classLoader) throws ClassNotFoundException {
+        try {
+            int begin = name.lastIndexOf('.') + 1;
+            String iPackage = name.substring(13, begin);
+            String iName = iPackage + name.substring(begin + 1, name.length() - 5);
+
+            return classLoader.loadClass(iName);
+        } catch (ClassNotFoundException e) {
+            // don't log exceptions from CosNaming because it attempts to load every
+            // class bound into the name server
+            
+            //FIXME this variable is never read, can we remove the
+            // whole block of code??
+            //boolean shouldLog = true;
+            StackTraceElement[] stackTrace = e.getStackTrace();
+            for (int i = 0; i < stackTrace.length; i++) {
+                StackTraceElement stackTraceElement = stackTrace[i];
+                if (stackTraceElement.getClassName().equals("org.omg.CosNaming.NamingContextExtPOA") && stackTraceElement
+                    .getMethodName().equals("_invoke")) {
+                    //shouldLog = false;
+                    break;
+                }
+            }
+
+            throw new ClassNotFoundException("Unable to generate stub", e);
+        }
+    }
+
+    private static final CallbackFilter FILTER = new CallbackFilter() {
+        public int accept(Method method) {
+            // we don't intercept non-public methods like finalize
+            if (!Modifier.isPublic(method.getModifiers())) {
+                return 0;
+            }
+
+            if (method.getReturnType().equals(String[].class) && method.getParameterTypes().length == 0
+                && method.getName().equals("_ids")) {
+                return 2;
+            }
+
+            if (Modifier.isAbstract(method.getModifiers())) {
+                return 1;
+            }
+
+            return 0;
+        }
+    };
+
+    private static final class Ids implements FixedValue {
+        private final String[] typeIds;
+
+        public Ids(Class type) {
+            typeIds = Java2IDLUtil.createCorbaIds(type);
+        }
+
+        public Object loadObject() throws Exception {
+            return typeIds;
+        }
+    }
+
+}