Trait opcua_server::address_space::node::Node
source · [−]pub trait Node: NodeBase {
fn get_attribute_max_age(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName,
max_age: f64
) -> Option<DataValue>;
fn set_attribute(
&mut self,
attribute_id: AttributeId,
value: Variant
) -> Result<(), StatusCode>;
fn get_attribute(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName
) -> Option<DataValue> { ... }
}
Expand description
Implemented by each node type’s to provide a generic way to set or get attributes, e.g. from the Attributes service set. Internal callers could call the setter / getter on the node if they have access to them.
Required methods
fn get_attribute_max_age(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName,
max_age: f64
) -> Option<DataValue>
fn get_attribute_max_age(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName,
max_age: f64
) -> Option<DataValue>
Finds the attribute and value. The param max_age
is a hint in milliseconds:
- value 0, server shall attempt to read a new value from the data source
- value >= i32::max(), sever shall attempt to get a cached value
If there is a getter registered with the node, then the getter will interpret
max_age
how it sees fit.
fn set_attribute(
&mut self,
attribute_id: AttributeId,
value: Variant
) -> Result<(), StatusCode>
fn set_attribute(
&mut self,
attribute_id: AttributeId,
value: Variant
) -> Result<(), StatusCode>
Sets the attribute with the new value
Provided methods
fn get_attribute(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName
) -> Option<DataValue>
fn get_attribute(
&self,
timestamps_to_return: TimestampsToReturn,
attribute_id: AttributeId,
index_range: NumericRange,
data_encoding: &QualifiedName
) -> Option<DataValue>
Finds the attribute and value.