mirror of https://github.com/grpc/grpc-node.git
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
/*
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*
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* Copyright 2015, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
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#define NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
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#include <nan.h>
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#include "grpc/grpc.h"
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namespace grpc {
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namespace node {
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/* A worker that asynchronously calls completion_queue_next, and queues onto the
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node event loop a call to the function stored in the event's tag. */
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class CompletionQueueAsyncWorker : public NanAsyncWorker {
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public:
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CompletionQueueAsyncWorker();
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~CompletionQueueAsyncWorker();
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/* Calls completion_queue_next with the provided deadline, and stores the
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event if there was one or sets an error message if there was not */
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void Execute();
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/* Returns the completion queue attached to this class */
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static grpc_completion_queue *GetQueue();
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/* Convenience function to create a worker with the given arguments and queue
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it to run asynchronously */
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static void Next();
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/* Initialize the CompletionQueueAsyncWorker class */
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static void Init(v8::Handle<v8::Object> exports);
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protected:
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/* Called when Execute has succeeded (completed without setting an error
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message). Calls the saved callback with the event that came from
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completion_queue_next */
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void HandleOKCallback();
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void HandleErrorCallback();
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private:
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grpc_event result;
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static grpc_completion_queue *queue;
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// Number of grpc_completion_queue_next calls in the thread pool
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static int current_threads;
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// Number of grpc_completion_queue_next calls waiting to enter the thread pool
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static int waiting_next_calls;
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};
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} // namespace node
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} // namespace grpc
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#endif // NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
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