src/core/client_config/subchannel_factory_decorators/merge_channel_args.c

/*
 *
 * Copyright 2015, Google Inc.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "src/core/client_config/subchannel_factory_decorators/merge_channel_args.h"
#include <grpc/support/alloc.h>
#include "src/core/channel/channel_args.h"

typedef struct {
  grpc_subchannel_factory base;
  gpr_refcount refs;
  grpc_subchannel_factory *wrapped;
  grpc_channel_args *merge_args;
} merge_args_factory;

static void merge_args_factory_ref(grpc_subchannel_factory *scf) {
  merge_args_factory *f = (merge_args_factory *)scf;
  gpr_ref(&f->refs);
}

static void merge_args_factory_unref(grpc_subchannel_factory *scf) {
  merge_args_factory *f = (merge_args_factory *)scf;
  if (gpr_unref(&f->refs)) {
  	grpc_subchannel_factory_unref(f->wrapped);
    grpc_channel_args_destroy(f->merge_args);
    gpr_free(f);
  }
}

static grpc_subchannel *merge_args_factory_create_subchannel(
    grpc_subchannel_factory *scf, grpc_subchannel_args *args) {
  merge_args_factory *f = (merge_args_factory *)scf;
  grpc_channel_args *final_args =
      grpc_channel_args_merge(args->args, f->merge_args);
  grpc_subchannel *s;
  s = grpc_subchannel_factory_create_subchannel(f->wrapped, args);
  grpc_channel_args_destroy(final_args);
  return s;
}

static const grpc_subchannel_factory_vtable merge_args_factory_vtable = {
    merge_args_factory_ref, merge_args_factory_unref,
    merge_args_factory_create_subchannel};

grpc_subchannel_factory *grpc_subchannel_factory_merge_channel_args(
		grpc_subchannel_factory *input, const grpc_channel_args *args) {
  merge_args_factory *f = gpr_malloc(sizeof(*f));
  f->base.vtable = &merge_args_factory_vtable;
  gpr_ref_init(&f->refs, 1);
  f->wrapped = input;
  f->merge_args = grpc_channel_args_copy(args);
  return &f->base;
}