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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.
+ *
+ */
+
+#include <grpc++/client_context.h>
+
+#include "examples/pubsub/subscriber.h"
+
+using tech::pubsub::Topic;
+using tech::pubsub::DeleteTopicRequest;
+using tech::pubsub::GetTopicRequest;
+using tech::pubsub::SubscriberService;
+using tech::pubsub::ListTopicsRequest;
+using tech::pubsub::ListTopicsResponse;
+using tech::pubsub::PublishRequest;
+using tech::pubsub::PubsubMessage;
+
+namespace grpc {
+namespace examples {
+namespace pubsub {
+
+Subscriber::Subscriber(std::shared_ptr<ChannelInterface> channel)
+    : stub_(SubscriberService::NewStub(channel)) {
+}
+
+void Subscriber::Shutdown() {
+  stub_.reset();
+}
+
+Status Subscriber::CreateSubscription(const grpc::string& topic,
+                                      const grpc::string& name) {
+  tech::pubsub::Subscription request;
+  tech::pubsub::Subscription response;
+  ClientContext context;
+
+  request.set_topic(topic);
+  request.set_name(name);
+
+  return stub_->CreateSubscription(&context, request, &response);
+}
+
+Status Subscriber::GetSubscription(const grpc::string& name,
+                                   grpc::string* topic) {
+  tech::pubsub::GetSubscriptionRequest request;
+  tech::pubsub::Subscription response;
+  ClientContext context;
+
+  request.set_subscription(name);
+
+  Status s = stub_->GetSubscription(&context, request, &response);
+  *topic = response.topic();
+  return s;
+}
+
+Status Subscriber::DeleteSubscription(const grpc::string& name) {
+  tech::pubsub::DeleteSubscriptionRequest request;
+  proto2::Empty response;
+  ClientContext context;
+
+  request.set_subscription(name);
+
+  return stub_->DeleteSubscription(&context, request, &response);
+}
+
+Status Subscriber::Pull(const grpc::string& name, grpc::string* data) {
+  tech::pubsub::PullRequest request;
+  tech::pubsub::PullResponse response;
+  ClientContext context;
+
+  request.set_subscription(name);
+  Status s = stub_->Pull(&context, request, &response);
+  if (s.IsOk()) {
+    tech::pubsub::PubsubEvent event = response.pubsub_event();
+    if (event.has_message()) {
+      *data = event.message().data();
+    }
+    tech::pubsub::AcknowledgeRequest ack;
+    proto2::Empty empty;
+    ClientContext ack_context;
+    ack.set_subscription(name);
+    ack.add_ack_id(response.ack_id());
+    stub_->Acknowledge(&ack_context, ack, &empty);
+  }
+  return s;
+}
+
+}  // namespace pubsub
+}  // namespace examples
+}  // namespace grpc