1 files changed, 166 insertions, 0 deletions
diff --git a/src/cpp/server/server.cc b/src/cpp/server/server.cc
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+++ b/src/cpp/server/server.cc
@@ -0,0 +1,166 @@
+/*
+ *
+ * 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++/server.h>
+#include <utility>
+
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include "src/cpp/server/rpc_service_method.h"
+#include "src/cpp/server/server_rpc_handler.h"
+#include "src/cpp/server/thread_pool.h"
+#include <grpc++/async_server_context.h>
+#include <grpc++/completion_queue.h>
+
+namespace grpc {
+
+// TODO(rocking): consider a better default value like num of cores.
+static const int kNumThreads = 4;
+
+Server::Server(ThreadPoolInterface* thread_pool)
+    : started_(false),
+      shutdown_(false),
+      num_running_cb_(0),
+      thread_pool_(thread_pool == nullptr ? new ThreadPool(kNumThreads)
+                                          : thread_pool),
+      thread_pool_owned_(thread_pool == nullptr) {
+  server_ = grpc_server_create(cq_.cq(), nullptr);
+}
+
+Server::Server() {
+  // Should not be called.
+  GPR_ASSERT(false);
+}
+
+Server::~Server() {
+  std::unique_lock<std::mutex> lock(mu_);
+  if (started_ && !shutdown_) {
+    lock.unlock();
+    Shutdown();
+  }
+  grpc_server_destroy(server_);
+  if (thread_pool_owned_) {
+    delete thread_pool_;
+  }
+}
+
+void Server::RegisterService(RpcService* service) {
+  for (int i = 0; i < service->GetMethodCount(); ++i) {
+    RpcServiceMethod* method = service->GetMethod(i);
+    method_map_.insert(std::make_pair(method->name(), method));
+  }
+}
+
+void Server::AddPort(const grpc::string& addr) {
+  GPR_ASSERT(!started_);
+  int success = grpc_server_add_http2_port(server_, addr.c_str());
+  GPR_ASSERT(success);
+}
+
+void Server::Start() {
+  GPR_ASSERT(!started_);
+  started_ = true;
+  grpc_server_start(server_);
+
+  // Start processing rpcs.
+  ScheduleCallback();
+}
+
+void Server::AllowOneRpc() {
+  GPR_ASSERT(started_);
+  grpc_call_error err = grpc_server_request_call(server_, nullptr);
+  GPR_ASSERT(err == GRPC_CALL_OK);
+}
+
+void Server::Shutdown() {
+  {
+    std::unique_lock<std::mutex> lock(mu_);
+    if (started_ && !shutdown_) {
+      shutdown_ = true;
+      grpc_server_shutdown(server_);
+
+      // Wait for running callbacks to finish.
+      while (num_running_cb_ != 0) {
+        callback_cv_.wait(lock);
+      }
+    }
+  }
+
+  // Shutdown the completion queue.
+  cq_.Shutdown();
+  void* tag = nullptr;
+  CompletionQueue::CompletionType t = cq_.Next(&tag);
+  GPR_ASSERT(t == CompletionQueue::QUEUE_CLOSED);
+}
+
+void Server::ScheduleCallback() {
+  {
+    std::unique_lock<std::mutex> lock(mu_);
+    num_running_cb_++;
+  }
+  std::function<void()> callback = std::bind(&Server::RunRpc, this);
+  thread_pool_->ScheduleCallback(callback);
+}
+
+void Server::RunRpc() {
+  // Wait for one more incoming rpc.
+  void* tag = nullptr;
+  AllowOneRpc();
+  CompletionQueue::CompletionType t = cq_.Next(&tag);
+  GPR_ASSERT(t == CompletionQueue::SERVER_RPC_NEW);
+
+  AsyncServerContext* server_context = static_cast<AsyncServerContext*>(tag);
+  // server_context could be nullptr during server shutdown.
+  if (server_context != nullptr) {
+    // Schedule a new callback to handle more rpcs.
+    ScheduleCallback();
+
+    RpcServiceMethod* method = nullptr;
+    auto iter = method_map_.find(server_context->method());
+    if (iter != method_map_.end()) {
+      method = iter->second;
+    }
+    ServerRpcHandler rpc_handler(server_context, method);
+    rpc_handler.StartRpc();
+  }
+
+  {
+    std::unique_lock<std::mutex> lock(mu_);
+    num_running_cb_--;
+    if (shutdown_) {
+      callback_cv_.notify_all();
+    }
+  }
+}
+
+}  // namespace grpc