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diff --git a/include/grpc++/stream_context_interface.h b/include/grpc++/stream_context_interface.h
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+++ b/include/grpc++/stream_context_interface.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __GRPCPP_STREAM_CONTEXT_INTERFACE_H__
+#define __GRPCPP_STREAM_CONTEXT_INTERFACE_H__
+
+namespace google {
+namespace protobuf {
+class Message;
+}
+}
+
+namespace grpc {
+class Status;
+
+// An interface to avoid dependency on internal implementation.
+class StreamContextInterface {
+ public:
+  virtual ~StreamContextInterface() {}
+
+  virtual void Start(bool buffered) = 0;
+
+  virtual bool Read(google::protobuf::Message* msg) = 0;
+  virtual bool Write(const google::protobuf::Message* msg, bool is_last) = 0;
+  virtual const Status& Wait() = 0;
+  virtual void FinishStream(const Status& status, bool send) = 0;
+
+  virtual const google::protobuf::Message* request() = 0;
+  virtual google::protobuf::Message* response() = 0;
+};
+
+}  // namespace grpc
+
+#endif  // __GRPCPP_STREAM_CONTEXT_INTERFACE_H__