mecha10-core 0.8.0

Mecha10 core runtime and foundational types
Documentation 
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//! `ConcreteStateManager`: a `dyn`-free enum wrapper over `StateManager` backends.

use super::{FilesystemStateManager, MemoryStateManager, StateManager, StateOptions, StateSnapshot, VersionedState};
use crate::error::Result;
use serde::{de::DeserializeOwned, Serialize};

#[derive(Clone)]
pub enum ConcreteStateManager {
    Memory(MemoryStateManager),
    Filesystem(FilesystemStateManager),
}

macro_rules! delegate {
    ($self:expr, $method:ident $(, $arg:expr)*) => {
        match $self {
            Self::Memory(m) => m.$method($($arg),*).await,
            Self::Filesystem(f) => f.$method($($arg),*).await,
        }
    };
}

impl ConcreteStateManager {
    pub async fn save<T: Serialize + Send + Sync>(&self, node_id: &str, state: &T) -> Result<()> {
        delegate!(self, save, node_id, state)
    }

    pub async fn save_with_options<T: Serialize + Send + Sync>(
        &self,
        node_id: &str,
        state: &T,
        options: StateOptions,
    ) -> Result<()> {
        delegate!(self, save_with_options, node_id, state, options)
    }

    pub async fn load<T: DeserializeOwned + Send + Sync>(&self, node_id: &str) -> Result<Option<T>> {
        delegate!(self, load, node_id)
    }

    pub async fn load_versioned<T: DeserializeOwned + Send + Sync>(
        &self,
        node_id: &str,
    ) -> Result<Option<VersionedState<T>>> {
        delegate!(self, load_versioned, node_id)
    }

    pub async fn delete(&self, node_id: &str) -> Result<()> {
        delegate!(self, delete, node_id)
    }

    pub async fn exists(&self, node_id: &str) -> Result<bool> {
        delegate!(self, exists, node_id)
    }

    pub async fn list_nodes(&self) -> Result<Vec<String>> {
        delegate!(self, list_nodes)
    }

    pub async fn size(&self, node_id: &str) -> Result<Option<usize>> {
        delegate!(self, size, node_id)
    }

    pub async fn create_snapshot(&self, node_id: &str, description: Option<String>) -> Result<StateSnapshot> {
        delegate!(self, create_snapshot, node_id, description)
    }

    pub async fn restore_snapshot(&self, snapshot_id: &str) -> Result<()> {
        delegate!(self, restore_snapshot, snapshot_id)
    }

    pub async fn list_snapshots(&self, node_id: &str) -> Result<Vec<StateSnapshot>> {
        delegate!(self, list_snapshots, node_id)
    }

    pub async fn delete_snapshot(&self, snapshot_id: &str) -> Result<()> {
        delegate!(self, delete_snapshot, snapshot_id)
    }

    pub async fn compare_and_swap<T: Serialize + DeserializeOwned + Send + Sync>(
        &self,
        node_id: &str,
        expected: &T,
        new_value: &T,
    ) -> Result<bool> {
        delegate!(self, compare_and_swap, node_id, expected, new_value)
    }
}