text: /*
   *
   * 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 GRPC_CORE_LIB_SURFACE_CHANNEL_H
  #define GRPC_CORE_LIB_SURFACE_CHANNEL_H
  
  #include "src/core/lib/channel/channel_stack.h"
  #include "src/core/lib/channel/channel_stack_builder.h"
  #include "src/core/lib/surface/channel_stack_type.h"
  
  grpc_channel *grpc_channel_create(grpc_exec_ctx *exec_ctx, const char *target,
                                    const grpc_channel_args *args,
                                    grpc_channel_stack_type channel_stack_type,
                                    grpc_transport *optional_transport);
  
  grpc_channel *grpc_channel_create_with_builder(
      grpc_exec_ctx *exec_ctx, grpc_channel_stack_builder *builder,
      grpc_channel_stack_type channel_stack_type);
  
  /** Create a call given a grpc_channel, in order to call \a method.
      Progress is tied to activity on \a pollset_set. The returned call object is
      meant to be used with \a grpc_call_start_batch_and_execute, which relies on
      callbacks to signal completions. \a method and \a host need
      only live through the invocation of this function. If \a parent_call is
      non-NULL, it must be a server-side call. It will be used to propagate
      properties from the server call to this new client call, depending on the
      value of \a propagation_mask (see propagation_bits.h for possible values) */
  grpc_call *grpc_channel_create_pollset_set_call(
      grpc_exec_ctx *exec_ctx, grpc_channel *channel, grpc_call *parent_call,
      uint32_t propagation_mask, grpc_pollset_set *pollset_set, grpc_slice method,
      const grpc_slice *host, gpr_timespec deadline, void *reserved);
  
  /** Get a (borrowed) pointer to this channels underlying channel stack */
  grpc_channel_stack *grpc_channel_get_channel_stack(grpc_channel *channel);
  
  /** Get a grpc_mdelem of grpc-status: X where X is the numeric value of
      status_code.
  
      The returned elem is owned by the caller. */
  grpc_mdelem grpc_channel_get_reffed_status_elem(grpc_exec_ctx *exec_ctx,
                                                  grpc_channel *channel,
                                                  int status_code);
  
  size_t grpc_channel_get_call_size_estimate(grpc_channel *channel);
  void grpc_channel_update_call_size_estimate(grpc_channel *channel, size_t size);
  
  #ifdef GRPC_STREAM_REFCOUNT_DEBUG
  void grpc_channel_internal_ref(grpc_channel *channel, const char *reason);
  void grpc_channel_internal_unref(grpc_exec_ctx *exec_ctx, grpc_channel *channel,
                                   const char *reason);
  #define GRPC_CHANNEL_INTERNAL_REF(channel, reason) \
    grpc_channel_internal_ref(channel, reason)
  #define GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, channel, reason) \
    grpc_channel_internal_unref(exec_ctx, channel, reason)
  #else
  void grpc_channel_internal_ref(grpc_channel *channel);
  void grpc_channel_internal_unref(grpc_exec_ctx *exec_ctx,
                                   grpc_channel *channel);
  #define GRPC_CHANNEL_INTERNAL_REF(channel, reason) \
    grpc_channel_internal_ref(channel)
  #define GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, channel, reason) \
    grpc_channel_internal_unref(exec_ctx, channel)
  #endif
  
  /** Return the channel's compression options. */
  grpc_compression_options grpc_channel_compression_options(
      const grpc_channel *channel);
  
  #endif /* GRPC_CORE_LIB_SURFACE_CHANNEL_H */
  