subscription.h

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// Copyright 2015 Open Source Robotics Foundation, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef RCL__SUBSCRIPTION_H_
#define RCL__SUBSCRIPTION_H_

#ifdef __cplusplus
extern "C"
{
#endif

#include "rosidl_generator_c/message_type_support_struct.h"

#include "rcl/macros.h"
#include "rcl/node.h"
#include "rcl/visibility_control.h"

struct rcl_subscription_impl_t;

typedef struct rcl_subscription_t
{
  struct rcl_subscription_impl_t * impl;
} rcl_subscription_t;

typedef struct rcl_subscription_options_t
{
  rmw_qos_profile_t qos;

  rcl_allocator_t allocator;
  rmw_subscription_options_t rmw_subscription_options;
} rcl_subscription_options_t;


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_subscription_t
rcl_get_zero_initialized_subscription(void);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_subscription_init(
  rcl_subscription_t * subscription,
  const rcl_node_t * node,
  const rosidl_message_type_support_t * type_support,
  const char * topic_name,
  const rcl_subscription_options_t * options
);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_subscription_fini(rcl_subscription_t * subscription, rcl_node_t * node);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_subscription_options_t
rcl_subscription_get_default_options(void);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_take(
  const rcl_subscription_t * subscription,
  void * ros_message,
  rmw_message_info_t * message_info,
  rmw_subscription_allocation_t * allocation
);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_take_serialized_message(
  const rcl_subscription_t * subscription,
  rcl_serialized_message_t * serialized_message,
  rmw_message_info_t * message_info,
  rmw_subscription_allocation_t * allocation);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_take_loaned_message(
  const rcl_subscription_t * subscription,
  void ** loaned_message,
  rmw_message_info_t * message_info,
  rmw_subscription_allocation_t * allocation);


RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_return_loaned_message_from_subscription(
  const rcl_subscription_t * subscription,
  void * loaned_message);


RCL_PUBLIC
RCL_WARN_UNUSED
const char *
rcl_subscription_get_topic_name(const rcl_subscription_t * subscription);


RCL_PUBLIC
RCL_WARN_UNUSED
const rcl_subscription_options_t *
rcl_subscription_get_options(const rcl_subscription_t * subscription);


RCL_PUBLIC
RCL_WARN_UNUSED
rmw_subscription_t *
rcl_subscription_get_rmw_handle(const rcl_subscription_t * subscription);


RCL_PUBLIC
bool
rcl_subscription_is_valid(const rcl_subscription_t * subscription);


RCL_PUBLIC
RCL_WARN_UNUSED
rmw_ret_t
rcl_subscription_get_publisher_count(
  const rcl_subscription_t * subscription,
  size_t * publisher_count);


RCL_PUBLIC
RCL_WARN_UNUSED
const rmw_qos_profile_t *
rcl_subscription_get_actual_qos(const rcl_subscription_t * subscription);


RCL_PUBLIC
bool
rcl_subscription_can_loan_messages(const rcl_subscription_t * subscription);

#ifdef __cplusplus
}
#endif

#endif  // RCL__SUBSCRIPTION_H_