datum-core 0.6.0

Rust stream-processing library mirroring Akka/Pekko Streams Typed, built on Ractor actors
Documentation 
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use std::sync::Arc;

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Attribute {
    Name(Arc<str>),
    InputBuffer { initial: usize, max: usize },
    Dispatcher(Arc<str>),
}

#[derive(Clone, Debug, Default, PartialEq, Eq)]
pub struct Attributes {
    attribute_list: Vec<Attribute>,
}

impl Attributes {
    #[must_use]
    pub fn none() -> Self {
        Self::default()
    }

    #[must_use]
    pub fn named(name: impl Into<String>) -> Self {
        Self {
            attribute_list: vec![Attribute::Name(Arc::from(name.into()))],
        }
    }

    #[must_use]
    pub fn input_buffer(initial: usize, max: usize) -> Self {
        Self {
            attribute_list: vec![Attribute::InputBuffer { initial, max }],
        }
    }

    #[must_use]
    pub fn dispatcher(name: impl Into<String>) -> Self {
        Self {
            attribute_list: vec![Attribute::Dispatcher(Arc::from(name.into()))],
        }
    }

    #[must_use]
    pub fn and(mut self, other: Self) -> Self {
        if other.attribute_list.is_empty() {
            return self;
        }
        if self.attribute_list.is_empty() {
            return other;
        }
        let mut combined = other.attribute_list;
        combined.extend(self.attribute_list);
        self.attribute_list = combined;
        self
    }

    #[must_use]
    pub fn attribute_list(&self) -> &[Attribute] {
        &self.attribute_list
    }

    #[must_use]
    pub fn name(&self) -> Option<&str> {
        self.attribute_list
            .iter()
            .find_map(|attribute| match attribute {
                Attribute::Name(name) => Some(name.as_ref()),
                _ => None,
            })
    }

    #[must_use]
    pub fn input_buffer_hint(&self) -> Option<(usize, usize)> {
        self.attribute_list
            .iter()
            .find_map(|attribute| match attribute {
                Attribute::InputBuffer { initial, max } => Some((*initial, *max)),
                _ => None,
            })
    }

    #[must_use]
    pub fn dispatcher_hint(&self) -> Option<&str> {
        self.attribute_list
            .iter()
            .find_map(|attribute| match attribute {
                Attribute::Dispatcher(name) => Some(name.as_ref()),
                _ => None,
            })
    }

    #[must_use]
    pub fn with_name(mut self, name: impl Into<String>) -> Self {
        self.attribute_list
            .insert(0, Attribute::Name(Arc::from(name.into())));
        self
    }
}