/*
 * Copyright 2015, Google Inc.
 * All rights reserved.
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 * 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.
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 * 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
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#include <grpc++/completion_queue.h>

#include <memory>

#include <grpc++/impl/grpc_library.h>
#include <grpc++/support/time.h>
#include <grpc/grpc.h>
#include <grpc/support/log.h>

namespace grpc {

static internal::GrpcLibraryInitializer g_gli_initializer;

// 'CompletionQueue' constructor can safely call GrpcLibraryCodegen(false) here
// i.e not have GrpcLibraryCodegen call grpc_init(). This is because, to create
// a 'grpc_completion_queue' instance (which is being passed as the input to
// this constructor), one must have already called grpc_init().
CompletionQueue::CompletionQueue(grpc_completion_queue* take)
    : GrpcLibraryCodegen(false), cq_(take) {
  InitialAvalanching();
}

void CompletionQueue::Shutdown() {
  g_gli_initializer.summon();
  CompleteAvalanching();
}

void CompletionQueue::CompleteAvalanching() {
  // Check if this was the last avalanching operation
  if (gpr_atm_no_barrier_fetch_add(&avalanches_in_flight_,
                                   static_cast<gpr_atm>(-1)) == 1) {
    grpc_completion_queue_shutdown(cq_);
  }
}

CompletionQueue::NextStatus CompletionQueue::AsyncNextInternal(
    void** tag, bool* ok, gpr_timespec deadline) {
  for (;;) {
    auto ev = grpc_completion_queue_next(cq_, deadline, nullptr);
    switch (ev.type) {
      case GRPC_QUEUE_TIMEOUT:
        return TIMEOUT;
      case GRPC_QUEUE_SHUTDOWN:
        return SHUTDOWN;
      case GRPC_OP_COMPLETE:
        auto cq_tag = static_cast<CompletionQueueTag*>(ev.tag);
        *ok = ev.success != 0;
        *tag = cq_tag;
        if (cq_tag->FinalizeResult(tag, ok)) {
          return GOT_EVENT;
        }
        break;
    }
  }
}

}  // namespace grpc