| /* |
| * |
| * Copyright 2015, 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. |
| * |
| */ |
| |
| /* I don't like using #ifndef, but I don't see a better way to do this */ |
| #ifndef GRPC_UV |
| |
| #include <node.h> |
| #include <nan.h> |
| |
| #include "grpc/grpc.h" |
| #include "grpc/support/log.h" |
| #include "grpc/support/time.h" |
| #include "completion_queue.h" |
| #include "call.h" |
| |
| namespace grpc { |
| namespace node { |
| |
| namespace { |
| |
| /* A worker that asynchronously calls completion_queue_next, and queues onto the |
| node event loop a call to the function stored in the event's tag. */ |
| class CompletionQueueAsyncWorker : public Nan::AsyncWorker { |
| public: |
| CompletionQueueAsyncWorker(); |
| |
| ~CompletionQueueAsyncWorker(); |
| /* Calls completion_queue_next with the provided deadline, and stores the |
| event if there was one or sets an error message if there was not */ |
| void Execute(); |
| |
| /* Returns the completion queue attached to this class */ |
| static grpc_completion_queue *GetQueue(); |
| |
| /* Convenience function to create a worker with the given arguments and queue |
| it to run asynchronously */ |
| static void Next(); |
| |
| /* Initialize the CompletionQueueAsyncWorker class */ |
| static void Init(v8::Local<v8::Object> exports); |
| |
| protected: |
| /* Called when Execute has succeeded (completed without setting an error |
| message). Calls the saved callback with the event that came from |
| completion_queue_next */ |
| void HandleOKCallback(); |
| |
| void HandleErrorCallback(); |
| |
| private: |
| static void TryAddWorker(); |
| |
| grpc_event result; |
| |
| static grpc_completion_queue *queue; |
| |
| // Number of grpc_completion_queue_next calls in the thread pool |
| static int current_threads; |
| // Number of grpc_completion_queue_next calls waiting to enter the thread pool |
| static int waiting_next_calls; |
| }; |
| |
| const int max_queue_threads = 2; |
| |
| using v8::Function; |
| using v8::Local; |
| using v8::Object; |
| using v8::Value; |
| |
| grpc_completion_queue *CompletionQueueAsyncWorker::queue; |
| |
| // Invariants: current_threads <= max_queue_threads |
| // (current_threads == max_queue_threads) || (waiting_next_calls == 0) |
| |
| int CompletionQueueAsyncWorker::current_threads; |
| int CompletionQueueAsyncWorker::waiting_next_calls; |
| |
| CompletionQueueAsyncWorker::CompletionQueueAsyncWorker() |
| : Nan::AsyncWorker(NULL) {} |
| |
| CompletionQueueAsyncWorker::~CompletionQueueAsyncWorker() {} |
| |
| void CompletionQueueAsyncWorker::Execute() { |
| result = |
| grpc_completion_queue_next(queue, gpr_inf_future(GPR_CLOCK_REALTIME), NULL); |
| if (!result.success) { |
| SetErrorMessage("The async function encountered an error"); |
| } |
| } |
| |
| grpc_completion_queue *CompletionQueueAsyncWorker::GetQueue() { return queue; } |
| |
| void CompletionQueueAsyncWorker::TryAddWorker() { |
| if (current_threads < max_queue_threads && waiting_next_calls > 0) { |
| current_threads += 1; |
| waiting_next_calls -= 1; |
| CompletionQueueAsyncWorker *worker = new CompletionQueueAsyncWorker(); |
| Nan::AsyncQueueWorker(worker); |
| } |
| GPR_ASSERT(current_threads <= max_queue_threads); |
| GPR_ASSERT((current_threads == max_queue_threads) || |
| (waiting_next_calls == 0)); |
| } |
| |
| void CompletionQueueAsyncWorker::Next() { |
| waiting_next_calls += 1; |
| TryAddWorker(); |
| } |
| |
| void CompletionQueueAsyncWorker::Init(Local<Object> exports) { |
| Nan::HandleScope scope; |
| current_threads = 0; |
| waiting_next_calls = 0; |
| queue = grpc_completion_queue_create(NULL); |
| } |
| |
| void CompletionQueueAsyncWorker::HandleOKCallback() { |
| Nan::HandleScope scope; |
| current_threads -= 1; |
| TryAddWorker(); |
| CompleteTag(result.tag, NULL); |
| |
| DestroyTag(result.tag); |
| } |
| |
| void CompletionQueueAsyncWorker::HandleErrorCallback() { |
| Nan::HandleScope scope; |
| current_threads -= 1; |
| TryAddWorker(); |
| CompleteTag(result.tag, ErrorMessage()); |
| |
| DestroyTag(result.tag); |
| } |
| |
| } // namespace |
| |
| grpc_completion_queue *GetCompletionQueue() { |
| return CompletionQueueAsyncWorker::GetQueue(); |
| } |
| |
| void CompletionQueueNext() { |
| CompletionQueueAsyncWorker::Next(); |
| } |
| |
| void CompletionQueueInit(Local<Object> exports) { |
| CompletionQueueAsyncWorker::Init(exports); |
| } |
| |
| } // namespace node |
| } // namespace grpc |
| |
| #endif /* GRPC_UV */ |