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diff --git a/sca-java-1.x/branches/sca-java-0.99/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/ServiceBindingProvider2.java b/sca-java-1.x/branches/sca-java-0.99/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/ServiceBindingProvider2.java
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+++ b/sca-java-1.x/branches/sca-java-0.99/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/ServiceBindingProvider2.java
@@ -0,0 +1,54 @@
+/*
+ * 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.provider;
+
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+
+/**
+ * A service binding can optionally implement this interface to tie
+ * into the Tuscany SCA runtime with support for callbacks
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ServiceBindingProvider2 extends ServiceBindingProvider {
+
+    /**
+     * Create a callback invoker for the service binding. The invoker is
+     * responsible for making the callback invocation over the binding
+     * protocol.
+     * 
+     * @param operation The operation that the interceptor will handle
+     * @return An invoker that handles the invocation logic, null should be
+     *         returned if no invoker is required
+     */
+    Invoker createCallbackInvoker(Operation operation);
+
+    /**
+     * For bindings that invoke one-way callback operations asynchronously,
+     * there is no need to perform a thread switch before calling the invoker.
+     * This method indicates whether the binding has this capability.
+     * 
+     * @return true if the callback invoker is able to invoke one-way operations
+     *         asynchronously, false if all invocations are synchronous
+     */
+    boolean supportsAsyncOneWayInvocation();
+
+}