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Refactor graph API docs #401

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Mar 20, 2019
Merged

Refactor graph API docs #401

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2f0dc16
Refactor graph API docs
jacobperron Mar 15, 2019
6164c72
Fix typo
jacobperron Mar 18, 2019
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161 changes: 62 additions & 99 deletions rcl/include/rcl/graph.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,23 +36,20 @@ typedef rmw_names_and_types_t rcl_names_and_types_t;

#define rcl_get_zero_initialized_names_and_types rmw_get_zero_initialized_names_and_types

/// Return a list of publisher topic names and their types per node.
/// Return a list of topic names and types for publishers associated with a node.
/**
* This function returns a list of topic names in the ROS graph for param node_name and their types.
* The `node` parameter must point to a valid node.
*
* The node parameter must not be `NULL`, and must point to a valid node.
*
* The topic_names_and_types parameter must be allocated and zero initialized.
* The topic_names_and_types is the output for this function, and contains
* allocated memory.
* Therefore, it should be passed to rcl_names_and_types_fini() when
* it is no longer needed.
* The `topic_names_and_types` parameter must be allocated and zero initialized.
* This function allocates memory for the returned list of names and types and so it is the
* callers responsibility to pass `topic_names_and_types` to rcl_names_and_types_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
* There may be some demangling that occurs when listing the topics from the
* middleware implementation.
* If the no_demangle argument is true, then this will be avoided and the
* topics will be returned as they appear to the middleware.
* There may be some demangling that occurs when listing the names from the middleware
* implementation.
* If the `no_demangle` argument is set to `true`, then this will be avoided and the names will be
* returned as they appear to the middleware.
*
* \see rmw_get_topic_names_and_types for more details on no_demangle
*
Expand All @@ -72,8 +69,8 @@ typedef rmw_names_and_types_t rcl_names_and_types_t;
* \param[in] node the handle to the node being used to query the ROS graph
* \param[in] allocator allocator to be used when allocating space for strings
* \param[in] no_demangle if true, list all topics without any demangling
* \param[in] node_name of the node to look up topics
* \param[in] node_namespace of the node to look up topics
* \param[in] node_name the node name of the topics to return
* \param[in] node_namespace the node namespace of the topics to return
* \param[out] topic_names_and_types list of topic names and their types
* \return `RCL_RET_OK` if the query was successful, or
* \return `RCL_RET_NODE_INVALID` if the node is invalid, or
Expand All @@ -91,25 +88,17 @@ rcl_get_publisher_names_and_types_by_node(
const char * node_namespace,
rcl_names_and_types_t * topic_names_and_types);

/// Return a list of subcriber topic names and their types per node.
/// Return a list of topic names and types for subscriptions associated with a node.
/**
* This function returns a list of topic names in the ROS graph for param node_name and their types.
*
* The node parameter must not be `NULL`, and must point to a valid node.
* The `node` parameter must point to a valid node.
*
* The topic_names_and_types parameter must be allocated and zero initialized.
* The topic_names_and_types is the output for this function, and contains
* allocated memory.
* Therefore, it should be passed to rcl_names_and_types_fini() when
* it is no longer needed.
* The `topic_names_and_types` parameter must be allocated and zero initialized.
* This function allocates memory for the returned list of names and types and so it is the
* callers responsibility to pass `topic_names_and_types` to rcl_names_and_types_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
* There may be some demangling that occurs when listing the topics from the
* middleware implementation.
* If the no_demangle argument is true, then this will be avoided and the
* topics will be returned as they appear to the middleware.
*
* \see rmw_get_topic_names_and_types for more details on no_demangle
* \see rcl_get_publisher_names_and_types_by_node for details on the `no_demangle` parameter.
*
* The returned names are not automatically remapped by this function.
* Attempting to create publishers or subscribers using names returned by this function may not
Expand All @@ -127,8 +116,8 @@ rcl_get_publisher_names_and_types_by_node(
* \param[in] node the handle to the node being used to query the ROS graph
* \param[in] allocator allocator to be used when allocating space for strings
* \param[in] no_demangle if true, list all topics without any demangling
* \param[in] node_name of the node to look up topics
* \param[in] node_namespace of the node to look up topics
* \param[in] node_name the node name of the topics to return
* \param[in] node_namespace the node namespace of the topics to return
* \param[out] topic_names_and_types list of topic names and their types
* \return `RCL_RET_OK` if the query was successful, or
* \return `RCL_RET_NODE_INVALID` if the node is invalid, or
Expand All @@ -146,29 +135,21 @@ rcl_get_subscriber_names_and_types_by_node(
const char * node_namespace,
rcl_names_and_types_t * topic_names_and_types);

/// Return a list of service names and their types per node.
/// Return a list of service names and types for associated with a node.
/**
* This function returns a list of service names in the ROS graph for param node_name and their types.
* The `node` parameter must point to a valid node.
*
* The node parameter must not be `NULL`, and must point to a valid node.
*
* The topic_names_and_types parameter must be allocated and zero initialized.
* The topic_names_and_types is the output for this function, and contains
* allocated memory.
* Therefore, it should be passed to rcl_names_and_types_fini() when
* it is no longer needed.
* The `service_names_and_types` parameter must be allocated and zero initialized.
* This function allocates memory for the returned list of names and types and so it is the
* callers responsibility to pass `service_names_and_types` to rcl_names_and_types_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
* There may be some demangling that occurs when listing the topics from the
* middleware implementation.
* If the no_demangle argument is true, then this will be avoided and the
* topics will be returned as they appear to the middleware.
*
* \see rmw_get_topic_names_and_types for more details on no_demangle
* \see rcl_get_publisher_names_and_types_by_node for details on the `no_demangle` parameter.
*
* The returned names are not automatically remapped by this function.
* Attempting to create publishers or subscribers using names returned by this function may not
* result in the desired topic name being used depending on the remap rules in use.
* Attempting to create clients or services using names returned by this function may not
* result in the desired service name being used depending on the remap rules in use.
*
* <hr>
* Attribute | Adherence
Expand All @@ -181,8 +162,8 @@ rcl_get_subscriber_names_and_types_by_node(
*
* \param[in] node the handle to the node being used to query the ROS graph
* \param[in] allocator allocator to be used when allocating space for strings
* \param[in] node_name of the node to look up topics
* \param[in] node_namespace of the node to look up topics
* \param[in] node_name the node name of the services to return
* \param[in] node_namespace the node namespace of the services to return
* \param[out] service_names_and_types list of service names and their types
* \return `RCL_RET_OK` if the query was successful, or
* \return `RCL_RET_NODE_INVALID` if the node is invalid, or
Expand All @@ -201,23 +182,15 @@ rcl_get_service_names_and_types_by_node(

/// Return a list of topic names and their types.
/**
* This function returns a list of topic names in the ROS graph and their types.
*
* The node parameter must not be `NULL`, and must point to a valid node.
* The `node` parameter must point to a valid node.
*
* The topic_names_and_types parameter must be allocated and zero initialized.
* The topic_names_and_types is the output for this function, and contains
* allocated memory.
* Therefore, it should be passed to rcl_names_and_types_fini() when
* it is no longer needed.
* The `topic_names_and_types` parameter must be allocated and zero initialized.
* This function allocates memory for the returned list of names and types and so it is the
* callers responsibility to pass `topic_names_and_types` to rcl_names_and_types_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
* There may be some demangling that occurs when listing the topics from the
* middleware implementation.
* If the no_demangle argument is true, then this will be avoided and the
* topics will be returned as they appear to the middleware.
*
* \see rmw_get_topic_names_and_types for more details on no_demangle
* \see rcl_get_publisher_names_and_types_by_node for details on the `no_demangle` parameter.
*
* The returned names are not automatically remapped by this function.
* Attempting to create publishers or subscribers using names returned by this function may not
Expand Down Expand Up @@ -252,15 +225,12 @@ rcl_get_topic_names_and_types(

/// Return a list of service names and their types.
/**
* This function returns a list of service names in the ROS graph and their types.
* The `node` parameter must point to a valid node.
*
* The node parameter must not be `NULL`, and must point to a valid node.
*
* The service_names_and_types parameter must be allocated and zero initialized.
* The service_names_and_types is the output for this function, and contains
* allocated memory.
* Therefore, it should be passed to rcl_names_and_types_fini() when
* it is no longer needed.
* The `service_names_and_types` parameter must be allocated and zero initialized.
* This function allocates memory for the returned list of names and types and so it is the
* callers responsibility to pass `service_names_and_types` to rcl_names_and_types_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
* The returned names are not automatically remapped by this function.
Expand Down Expand Up @@ -298,7 +268,7 @@ rcl_get_service_names_and_types(
* functions.
* This function reclaims any resources allocated during population.
*
* The names_and_types parameter must not be `NULL`, and must point to an
* The `names_and_types` parameter must not be `NULL`, and must point to an
* already allocated rcl_names_and_types_t struct that was previously
* passed to a successful rcl_get_*_names_and_types() function call.
*
Expand All @@ -322,17 +292,14 @@ rcl_names_and_types_fini(rcl_names_and_types_t * names_and_types);

/// Return a list of available nodes in the ROS graph.
/**
* This function returns a list of nodes in the ROS graph.
*
* The node parameter must not be `NULL`, and must point to a valid node.
* The `node` parameter must point to a valid node.
*
* The node_names parameter must be allocated and zero initialized.
* The node_names is the output for this function, and contains
* allocated memory.
* Note that entries in the array might contain `NULL` value.
* The `node_names` parameter must be allocated and zero initialized.
* `node_names` is the output for this function, and contains allocated memory.
* Note that entries in the array might contain `NULL` values.
* Use rcutils_get_zero_initialized_string_array() for initializing an empty
* rcutils_string_array_t struct.
* This node_names struct should therefore be passed to rcutils_string_array_fini()
* This `node_names` struct should therefore be passed to rcutils_string_array_fini()
* when it is no longer needed.
* Failing to do so will result in leaked memory.
*
Expand Down Expand Up @@ -379,16 +346,14 @@ rcl_get_node_names(

/// Return the number of publishers on a given topic.
/**
* This function returns the number of publishers on a given topic.
* The `node` parameter must point to a valid node.
*
* The node parameter must not be `NULL`, and must point to a valid node.
*
* The topic_name parameter must not be `NULL`, and must not be an empty string.
* The `topic_name` parameter must not be `NULL`, and must not be an empty string.
* It should also follow the topic name rules.
* \todo TODO(wjwwood): link to the topic name rules.
*
* The count parameter must not be `NULL`, and must point to a valid bool.
* The count parameter is the output for this function and will be set.
* The `count` parameter must point to a valid bool.
* The `count` parameter is the output for this function and will be set.
*
* In the event that error handling needs to allocate memory, this function
* will try to use the node's allocator.
Expand Down Expand Up @@ -426,16 +391,14 @@ rcl_count_publishers(

/// Return the number of subscriptions on a given topic.
/**
* This function returns the number of subscriptions on a given topic.
*
* The node parameter must not be `NULL`, and must point to a valid node.
* The `node` parameter must point to a valid node.
*
* The topic_name parameter must not be `NULL`, and must not be an empty string.
* The `topic_name` parameter must not be `NULL`, and must not be an empty string.
* It should also follow the topic name rules.
* \todo TODO(wjwwood): link to the topic name rules.
*
* The count parameter must not be `NULL`, and must point to a valid bool.
* The count parameter is the output for this function and will be set.
* The `count` parameter must point to a valid bool.
* The `count` parameter is the output for this function and will be set.
*
* In the event that error handling needs to allocate memory, this function
* will try to use the node's allocator.
Expand Down Expand Up @@ -473,18 +436,18 @@ rcl_count_subscribers(

/// Check if a service server is available for the given service client.
/**
* This function will return true for is_available if there is a service server
* This function will return true for `is_available` if there is a service server
* available for the given client.
*
* The node parameter must not be `NULL`, and must point to a valid node.
* The `node` parameter must point to a valid node.
*
* The client parameter must not be `NULL`, and must point to a valid client.
* The `client` parameter must point to a valid client.
*
* The given client and node must match, i.e. the client must have been created
* using the given node.
*
* The is_available parameter must not be `NULL`, and must point a bool variable.
* The result of the check will be stored in the is_available parameter.
* The `is_available` parameter must not be `NULL`, and must point a bool variable.
* The result of the check will be stored in the `is_available` parameter.
*
* In the event that error handling needs to allocate memory, this function
* will try to use the node's allocator.
Expand Down