src/core/client_config/lb_policy_registry.c

/*
 *
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 *
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 * 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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#include "src/core/client_config/lb_policy_registry.h"

#include <string.h>

#define MAX_POLICIES 10

static grpc_lb_policy_factory *g_all_of_the_lb_policies[MAX_POLICIES];
static int g_number_of_lb_policies = 0;

static grpc_lb_policy_factory *g_default_lb_policy_factory;

void
grpc_lb_policy_registry_init (grpc_lb_policy_factory * default_factory)
{
  g_number_of_lb_policies = 0;
  g_default_lb_policy_factory = default_factory;
}

void
grpc_lb_policy_registry_shutdown (void)
{
  int i;
  for (i = 0; i < g_number_of_lb_policies; i++)
    {
      grpc_lb_policy_factory_unref (g_all_of_the_lb_policies[i]);
    }
}

void
grpc_register_lb_policy (grpc_lb_policy_factory * factory)
{
  int i;
  for (i = 0; i < g_number_of_lb_policies; i++)
    {
      GPR_ASSERT (0 != strcmp (factory->vtable->name, g_all_of_the_lb_policies[i]->vtable->name));
    }
  GPR_ASSERT (g_number_of_lb_policies != MAX_POLICIES);
  grpc_lb_policy_factory_ref (factory);
  g_all_of_the_lb_policies[g_number_of_lb_policies++] = factory;
}

static grpc_lb_policy_factory *
lookup_factory (const char *name)
{
  int i;

  if (name == NULL)
    return NULL;

  for (i = 0; i < g_number_of_lb_policies; i++)
    {
      if (0 == strcmp (name, g_all_of_the_lb_policies[i]->vtable->name))
	{
	  return g_all_of_the_lb_policies[i];
	}
    }

  return NULL;
}

grpc_lb_policy *
grpc_lb_policy_create (const char *name, grpc_lb_policy_args * args)
{
  grpc_lb_policy_factory *factory = lookup_factory (name);
  grpc_lb_policy *lb_policy = grpc_lb_policy_factory_create_lb_policy (factory, args);
  return lb_policy;
}