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+/*
+ *
+ * Copyright 2017, 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 TEST_CPP_MICROBENCHMARKS_FULLSTACK_CONTEXT_MUTATORS_H
+#define TEST_CPP_MICROBENCHMARKS_FULLSTACK_CONTEXT_MUTATORS_H
+
+#include <grpc++/channel.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/security/credentials.h>
+#include <grpc++/security/server_credentials.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include <grpc++/server_context.h>
+#include <grpc/support/log.h>
+
+#include "test/cpp/microbenchmarks/helpers.h"
+
+namespace grpc {
+namespace testing {
+
+/*******************************************************************************
+ * CONTEXT MUTATORS
+ */
+
+static const int kPregenerateKeyCount = 100000;
+
+template <class F>
+auto MakeVector(size_t length, F f) -> std::vector<decltype(f())> {
+  std::vector<decltype(f())> out;
+  out.reserve(length);
+  for (size_t i = 0; i < length; i++) {
+    out.push_back(f());
+  }
+  return out;
+}
+
+class NoOpMutator {
+ public:
+  template <class ContextType>
+  NoOpMutator(ContextType* context) {}
+};
+
+template <int length>
+class RandomBinaryMetadata {
+ public:
+  static const grpc::string& Key() { return kKey; }
+
+  static const grpc::string& Value() {
+    return kValues[rand() % kValues.size()];
+  }
+
+ private:
+  static const grpc::string kKey;
+  static const std::vector<grpc::string> kValues;
+
+  static grpc::string GenerateOneString() {
+    grpc::string s;
+    s.reserve(length + 1);
+    for (int i = 0; i < length; i++) {
+      s += (char)rand();
+    }
+    return s;
+  }
+};
+
+template <int length>
+class RandomAsciiMetadata {
+ public:
+  static const grpc::string& Key() { return kKey; }
+
+  static const grpc::string& Value() {
+    return kValues[rand() % kValues.size()];
+  }
+
+ private:
+  static const grpc::string kKey;
+  static const std::vector<grpc::string> kValues;
+
+  static grpc::string GenerateOneString() {
+    grpc::string s;
+    s.reserve(length + 1);
+    for (int i = 0; i < length; i++) {
+      s += (char)(rand() % 26 + 'a');
+    }
+    return s;
+  }
+};
+
+template <class Generator, int kNumKeys>
+class Client_AddMetadata : public NoOpMutator {
+ public:
+  Client_AddMetadata(ClientContext* context) : NoOpMutator(context) {
+    for (int i = 0; i < kNumKeys; i++) {
+      context->AddMetadata(Generator::Key(), Generator::Value());
+    }
+  }
+};
+
+template <class Generator, int kNumKeys>
+class Server_AddInitialMetadata : public NoOpMutator {
+ public:
+  Server_AddInitialMetadata(ServerContext* context) : NoOpMutator(context) {
+    for (int i = 0; i < kNumKeys; i++) {
+      context->AddInitialMetadata(Generator::Key(), Generator::Value());
+    }
+  }
+};
+
+// static initialization
+
+template <int length>
+const grpc::string RandomBinaryMetadata<length>::kKey = "foo-bin";
+
+template <int length>
+const std::vector<grpc::string> RandomBinaryMetadata<length>::kValues =
+    MakeVector(kPregenerateKeyCount, GenerateOneString);
+
+template <int length>
+const grpc::string RandomAsciiMetadata<length>::kKey = "foo";
+
+template <int length>
+const std::vector<grpc::string> RandomAsciiMetadata<length>::kValues =
+    MakeVector(kPregenerateKeyCount, GenerateOneString);
+
+}  // namespace testing
+}  // namespace grpc
+
+#endif