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use std::collections::HashMap;
use std::fmt::{Debug, Display, Formatter};
use crate::api::runtime::CheckpointId;
#[derive(Clone, Serialize, Deserialize, Debug)]
#[serde(tag = "type", content = "param")]
pub enum CheckpointBackend {
Memory,
MySql {
endpoint: String,
table: Option<String>,
},
}
impl Display for CheckpointBackend {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
CheckpointBackend::Memory => write!(f, "Memory"),
CheckpointBackend::MySql { endpoint, table } => {
write!(f, "MySql{{endpoint={}}}, table={:?}}}", endpoint, table)
}
}
}
}
#[derive(Copy, Clone, Serialize, Deserialize, Debug)]
#[serde(tag = "type", content = "param")]
pub enum KeyedStateBackend {
Memory,
}
impl Display for KeyedStateBackend {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
KeyedStateBackend::Memory => write!(f, "Memory"),
}
}
}
#[derive(Clone, Debug)]
pub struct StateValue {
pub values: Vec<String>,
}
impl StateValue {
pub fn new(values: Vec<String>) -> Self {
StateValue { values }
}
}
pub trait OperatorState: Debug {
fn update(&mut self, checkpoint_id: CheckpointId, values: Vec<String>);
fn snapshot(&mut self) -> std::io::Result<()>;
fn load_latest(&self, checkpoint_id: CheckpointId)
-> std::io::Result<HashMap<u16, StateValue>>;
}