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use std::hash::Hash;
use std::collections::{HashMap};
use std::sync::atomic::{AtomicU32, Ordering};
use super::IdError;
pub trait ObjectStoreContent {
type IdType;
fn new_id(id_val: u32) -> Self::IdType;
fn id(&self) -> &Self::IdType;
}
#[derive(Debug)]
pub struct ObjectStore<T, TID>
where TID: Eq + Hash
{
id_to_object: HashMap<TID, T>,
name_to_id: HashMap<String, TID>,
next_id: AtomicU32,
}
impl<T, TID> ObjectStore<T, TID>
where T:ObjectStoreContent + ObjectStoreContent<IdType = TID>,
TID: Eq + Hash + Clone,
{
pub fn new() -> Self {
Self::with_capacity(0)
}
pub fn with_capacity(capacity: usize) -> Self {
Self {
id_to_object: HashMap::with_capacity(capacity),
name_to_id: HashMap::with_capacity(capacity),
next_id: AtomicU32::new(0)
}
}
pub fn reserve_id(&mut self) -> TID {
T::new_id(self.next_id.fetch_add(1, Ordering::SeqCst))
}
pub fn register(&mut self, name: Option<String>, object: T) -> Result<TID, IdError<TID>> {
if self.id_to_object.contains_key(object.id()) {
return Err(IdError::IdAlreadyExists(object.id().clone()))
}
if let Some(name_str) = &name {
if self.name_to_id.contains_key(name_str) {
return Err(IdError::NameAlreadyExists(name_str.clone()))
}
}
let object_id = object.id().clone();
self.id_to_object.insert(object.id().clone(), object);
if let Some(name_str) = name {
self.name_to_id.insert(name_str, object_id.clone());
}
Ok(object_id)
}
pub fn insert_new<CB>(&mut self, name: Option<String>, cb: CB) -> Result<TID, IdError<TID>>
where CB: FnOnce(TID) -> Result<T, IdError<TID>> {
let id: TID = self.reserve_id();
let id_clone = id.clone();
let object = cb(id)?;
if *object.id() != id_clone {
return Err(IdError::IdNotReserved(object.id().clone()));
}
self.register(name, object)
}
pub fn id_from_name(&self, name: &str) -> Option<&TID> {
self.name_to_id
.get(&name.to_owned())
}
pub fn name_from_id(&self, id: &TID) -> Option<&String> {
self.name_to_id.iter()
.find(|(_iter_name, iter_id)| { *iter_id == id })
.and_then(|(name, _)| Some(name))
}
pub fn get_by_name(&self, name: &str) -> Option<&T> {
self.id_from_name(name).and_then(|id| self.get(id))
}
pub fn get(&self, id: &TID) -> Option<&T> {
self.id_to_object.get(id)
}
pub fn get_mut(&mut self, id: &TID) -> Option<&mut T> {
self.id_to_object.get_mut(id)
}
pub fn iter_names(&self) -> impl Iterator<Item = (&String, &TID)> {
self.name_to_id.iter()
}
}
#[cfg(test)]
mod tests {
use stepflow_test_util::test_id;
use super::{ObjectStore};
use crate::{test::TestObject, test::TestObjectId, IdError};
#[test]
fn basic() {
let mut test_store: ObjectStore<TestObject, TestObjectId> = ObjectStore::new();
let t1 = test_store.insert_new(None, |id| Ok(TestObject::new(id, 100))).unwrap();
let t2 = test_store.insert_new(None, |id| Ok(TestObject::new(id, 200))).unwrap();
assert_ne!(t1, t2);
let t1_dupe = TestObject::new(t1.clone(), 3);
let dupe_result = test_store.register(None, t1_dupe);
assert_eq!(dupe_result, Err(IdError::IdAlreadyExists(t1.clone())));
let testid_bad = TestObjectId::new(1000);
let t_custom = test_store.insert_new(None, |_id| Ok(TestObject::new(testid_bad.clone(), 10)));
assert_eq!(t_custom, Err(IdError::IdNotReserved(testid_bad)));
assert_eq!(test_store.get(&t1).unwrap().val(), 100);
assert_eq!(test_store.get(&TestObjectId::new(999)), None);
assert_eq!(test_store.insert_new(None, |_id| Err(IdError::CannotParse("hi".to_owned()))), Err(IdError::CannotParse("hi".to_owned())));
}
#[test]
fn register() {
let mut test_store: ObjectStore<TestObject, TestObjectId> = ObjectStore::new();
let id1 = test_id!(TestObjectId);
let id2 = test_id!(TestObjectId);
test_store.register(None, TestObject::new(id1, 100)).unwrap();
test_store.register(None, TestObject::new(id2, 100)).unwrap();
assert_eq!(test_store.register(None, TestObject::new(id1, 100)), Err(IdError::IdAlreadyExists(id1)));
}
#[test]
fn names() {
let mut test_store: ObjectStore<TestObject, TestObjectId> = ObjectStore::new();
let t1 = test_store.insert_new(Some("t1".to_owned()), |id| Ok(TestObject::new(id, 100))).unwrap();
let _t2 = test_store.insert_new(Some("t2".to_owned()), |id| Ok(TestObject::new(id, 200))).unwrap();
let t1_dupe = test_store.insert_new(Some("t1".to_owned()), |id| Ok(TestObject::new(id, 150)));
assert_eq!(t1_dupe, Err(IdError::NameAlreadyExists("t1".to_owned())));
assert_eq!(test_store.id_from_name("t1").unwrap().val(), t1.val());
assert_eq!(test_store.get_by_name("t1").unwrap().val(), 100);
assert_eq!(test_store.get_by_name("BAD"), None);
}
#[test]
fn get() {
let mut test_store: ObjectStore<TestObject, TestObjectId> = ObjectStore::new();
let t1 = test_store.insert_new(Some("t1".to_owned()), |id| Ok(TestObject::new(id, 100))).unwrap();
let _t2 = test_store.insert_new(Some("t2".to_owned()), |id| Ok(TestObject::new(id, 200))).unwrap();
test_store.get_mut(&t1).unwrap().set_val(5);
assert_eq!(test_store.get(&t1).unwrap().val(), 5);
}
}