text: //
  // Copyright 2016, Google Inc.
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  #ifndef GRPC_CORE_LIB_TRANSPORT_SERVICE_CONFIG_H
  #define GRPC_CORE_LIB_TRANSPORT_SERVICE_CONFIG_H
  
  #include <grpc/impl/codegen/grpc_types.h>
  
  #include "src/core/lib/json/json.h"
  #include "src/core/lib/slice/slice_hash_table.h"
  
  typedef struct grpc_service_config grpc_service_config;
  
  grpc_service_config* grpc_service_config_create(const char* json_string);
  void grpc_service_config_destroy(grpc_service_config* service_config);
  
  /// Gets the LB policy name from \a service_config.
  /// Returns NULL if no LB policy name was specified.
  /// Caller does NOT take ownership.
  const char* grpc_service_config_get_lb_policy_name(
      const grpc_service_config* service_config);
  
  /// Creates a method config table based on the data in \a json.
  /// The table's keys are request paths.  The table's value type is
  /// returned by \a create_value(), based on data parsed from the JSON tree.
  /// \a vtable provides methods used to manage the values.
  /// Returns NULL on error.
  grpc_slice_hash_table* grpc_service_config_create_method_config_table(
      grpc_exec_ctx* exec_ctx, const grpc_service_config* service_config,
      void* (*create_value)(const grpc_json* method_config_json),
      const grpc_slice_hash_table_vtable* vtable);
  
  /// A helper function for looking up values in the table returned by
  /// \a grpc_service_config_create_method_config_table().
  /// Gets the method config for the specified \a path, which should be of
  /// the form "/service/method".
  /// Returns NULL if the method has no config.
  /// Caller does NOT own a reference to the result.
  void* grpc_method_config_table_get(grpc_exec_ctx* exec_ctx,
                                     const grpc_slice_hash_table* table,
                                     grpc_slice path);
  
  #endif /* GRPC_CORE_LIB_TRANSPORT_SERVICE_CONFIG_H */
  