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/*
*
* 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.
*
*/
#ifndef NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
#define NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
#include <nan.h>
#include "grpc/grpc.h"
namespace grpc {
namespace node {
/* 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:
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;
};
} // namespace node
} // namespace grpc
#endif // NET_GRPC_NODE_COMPLETION_QUEUE_ASYNC_WORKER_H_
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