update

BUILD

@@ -1968,6 +1968,7 @@ grpc_cc_library(
         "src/cpp/ext/filters/census/views.cc",
     ],
     hdrs = [
+        "include/grpcpp/opencensus.h",
         "src/cpp/ext/filters/census/client_filter.h",
         "src/cpp/ext/filters/census/server_filter.h",
         "src/cpp/ext/filters/census/channel_filter.h",

include/grpcpp/opencensus.h

@@ -0,0 +1,39 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed 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.
+ *
+ */
+
+#ifndef GRPCPP_OPENCENSUS_H
+#define GRPCPP_OPENCENSUS_H
+
+namespace grpc {
+
+// Registers the OpenCensus plugin with gRPC, so that it will be used for future
+// RPCs. This must be called before any views are created on the measures
+// defined below.
+void RegisterOpenCensusPlugin();
+
+// RPC stats definitions, defined by
+// https://github.com/census-instrumentation/opencensus-specs/blob/master/stats/gRPC.md
+
+// Registers the cumulative gRPC views so that they will be exported by any
+// registered stats exporter.
+// For on-task stats, construct a View using the ViewDescriptors below.
+void RegisterGrpcViewsForExport();
+
+}  // namespace grpc
+
+#endif  // GRPCPP_OPENCENSUS_H

src/cpp/ext/filters/census/grpc_plugin.h

@@ -22,27 +22,13 @@
 #include <grpc/support/port_platform.h>
 
 #include "absl/strings/string_view.h"
+#include "include/grpcpp/opencensus.h"
 #include "opencensus/stats/stats.h"
 #include "opencensus/trace/span.h"
 
-namespace grpc {
-class ServerContext;
-}
-
 namespace grpc {
 
-// Registers the OpenCensus plugin with gRPC, so that it will be used for future
+class ServerContext;
-// RPCs. This must be called before any views are created on the measures
-// defined below.
-void RegisterOpenCensusPlugin();
-
-// RPC stats definitions, defined by
-// https://github.com/census-instrumentation/opencensus-specs/blob/master/stats/gRPC.md
-
-// Registers the cumulative gRPC views so that they will be exported by any
-// registered stats exporter.
-// For on-task stats, construct a View using the ViewDescriptors below.
-void RegisterGrpcViewsForExport();
 
 // Returns the tracing Span for the current RPC.
 ::opencensus::trace::Span GetSpanFromServerContext(ServerContext* context);