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// This file is part of Gear.
// Copyright (C) 2022-2024 Gear Technologies Inc.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use crate::storage::{CountedByKey, DoubleMapStorage, EmptyCallback, KeyIterableByKeyMap};
use core::marker::PhantomData;
/// Represents tasks managing logic.
pub trait TaskPool {
/// Block number type.
type BlockNumber;
/// Task type.
type Task;
/// Inner error type of queue storing algorithm.
type Error: TaskPoolError;
/// Output error type of the queue.
type OutputError: From<Self::Error>;
/// Inserts given task in task pool.
fn add(bn: Self::BlockNumber, task: Self::Task) -> Result<(), Self::OutputError>;
/// Removes all tasks from task pool.
fn clear();
/// Returns bool, defining does task exist in task pool.
fn contains(bn: &Self::BlockNumber, task: &Self::Task) -> bool;
/// Removes task from task pool by given keys,
/// if present, else returns error.
fn delete(bn: Self::BlockNumber, task: Self::Task) -> Result<(), Self::OutputError>;
}
/// Represents store of task pool's action callbacks.
pub trait TaskPoolCallbacks {
/// Callback on success `add`.
type OnAdd: EmptyCallback;
/// Callback on success `delete`.
type OnDelete: EmptyCallback;
}
/// Represents task pool error type.
///
/// Contains constructors for all existing errors.
pub trait TaskPoolError {
/// Occurs when given task already exists in task pool.
fn duplicate_task() -> Self;
/// Occurs when task wasn't found in storage.
fn task_not_found() -> Self;
}
/// `TaskPool` implementation based on `DoubleMapStorage`.
///
/// Generic parameter `Error` requires `TaskPoolError` implementation.
/// Generic parameter `Callbacks` presents actions for success operations
/// over task pool.
pub struct TaskPoolImpl<T, Task, Error, OutputError, Callbacks>(
PhantomData<(T, Task, Error, OutputError, Callbacks)>,
)
where
T: DoubleMapStorage<Key2 = Task, Value = ()>,
Error: TaskPoolError,
OutputError: From<Error>,
Callbacks: TaskPoolCallbacks;
// Implementation of `TaskPool` for `TaskPoolImpl`.
impl<T, Task, Error, OutputError, Callbacks> TaskPool
for TaskPoolImpl<T, Task, Error, OutputError, Callbacks>
where
T: DoubleMapStorage<Key2 = Task, Value = ()>,
Error: TaskPoolError,
OutputError: From<Error>,
Callbacks: TaskPoolCallbacks,
{
type BlockNumber = T::Key1;
type Task = T::Key2;
type Error = Error;
type OutputError = OutputError;
fn add(bn: Self::BlockNumber, task: Self::Task) -> Result<(), Self::OutputError> {
if !Self::contains(&bn, &task) {
T::insert(bn, task, ());
Callbacks::OnAdd::call();
Ok(())
} else {
Err(Self::Error::duplicate_task().into())
}
}
fn clear() {
T::clear()
}
fn contains(bn: &Self::BlockNumber, task: &Self::Task) -> bool {
T::contains_keys(bn, task)
}
fn delete(bn: Self::BlockNumber, task: Self::Task) -> Result<(), Self::OutputError> {
if T::contains_keys(&bn, &task) {
T::remove(bn, task);
Callbacks::OnDelete::call();
Ok(())
} else {
Err(Self::Error::task_not_found().into())
}
}
}
// Implementation of `CountedByKey` trait for `TaskPoolImpl` in case,
// when inner `DoubleMapStorage` implements `CountedByKey`.
impl<T, Task, Error, OutputError, Callbacks> CountedByKey
for TaskPoolImpl<T, Task, Error, OutputError, Callbacks>
where
T: DoubleMapStorage<Key2 = Task, Value = ()> + CountedByKey<Key = T::Key1>,
Error: TaskPoolError,
OutputError: From<Error>,
Callbacks: TaskPoolCallbacks,
{
type Key = T::Key1;
type Length = T::Length;
fn len(key: &Self::Key) -> Self::Length {
T::len(key)
}
}
// Implementation of `KeyIterableByKeyMap` trait for `TaskPoolImpl` in case,
// when inner `DoubleMapStorage` implements `KeyIterableByKeyMap`.
impl<T, Task, Error, OutputError, Callbacks> KeyIterableByKeyMap
for TaskPoolImpl<T, Task, Error, OutputError, Callbacks>
where
T: DoubleMapStorage<Key2 = Task, Value = ()> + KeyIterableByKeyMap,
Error: TaskPoolError,
OutputError: From<Error>,
Callbacks: TaskPoolCallbacks,
{
type Key1 = <T as KeyIterableByKeyMap>::Key1;
type Key2 = <T as KeyIterableByKeyMap>::Key2;
type DrainIter = T::DrainIter;
type Iter = T::Iter;
fn drain_prefix_keys(bn: Self::Key1) -> Self::DrainIter {
T::drain_prefix_keys(bn)
}
fn iter_prefix_keys(bn: Self::Key1) -> Self::Iter {
T::iter_prefix_keys(bn)
}
}