File size: 4,781 Bytes
f0634fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | import { Emitter, type Event } from '#/_base/event';
import { markAsDisposed, trackDisposable } from '#/_base/di/lifecycle';
import { Service } from '#/_base/di/service';
import { LifecycleScope } from '#/app/scopes';
import { ScopeActivation, registerScopedService } from '#/_base/di/scope';
import {
type ITaskHandle,
type IDeferredHandle,
ITaskService,
type TaskState,
TERMINAL_TASK_STATES,
TaskCancelledError,
} from './task';
function isTerminal(state: TaskState): boolean {
return TERMINAL_TASK_STATES.has(state);
}
class RunHandle<T> implements ITaskHandle<T> {
private _state: TaskState = 'pending';
private readonly _abortController = new AbortController();
private readonly _onDidChangeState = new Emitter<TaskState>();
readonly onDidChangeState: Event<TaskState> = this._onDidChangeState.event;
private readonly _onDidOutput = new Emitter<string>();
readonly onDidOutput: Event<string> = this._onDidOutput.event;
readonly result: Promise<T>;
private _disposed = false;
constructor(
readonly id: string,
fn: (signal: AbortSignal, output: (data: string) => void) => Promise<T>,
) {
trackDisposable(this);
const output = (data: string): void => {
if (!isTerminal(this._state) && !this._disposed) {
this._onDidOutput.fire(data);
}
};
this._transition('running');
this.result = fn(this._abortController.signal, output).then(
(value) => {
if (this._abortController.signal.aborted) {
this._transition('cancelled');
throw new TaskCancelledError(this.id);
}
this._transition('completed');
return value;
},
(error: unknown) => {
if (this._abortController.signal.aborted) {
this._transition('cancelled');
} else {
this._transition('failed');
}
throw error;
},
);
void this.result.catch(() => {});
}
get state(): TaskState {
return this._state;
}
cancel(): void {
if (isTerminal(this._state)) return;
this._abortController.abort(new TaskCancelledError(this.id));
this._transition('cancelled');
}
dispose(): void {
if (this._disposed) return;
this._disposed = true;
markAsDisposed(this);
this.cancel();
this._onDidChangeState.dispose();
this._onDidOutput.dispose();
}
private _transition(to: TaskState): void {
if (isTerminal(this._state)) return;
this._state = to;
if (!this._disposed) {
this._onDidChangeState.fire(to);
}
}
}
class DeferHandle<T> implements IDeferredHandle<T> {
private _state: TaskState = 'pending';
private _resolvePromise!: (value: T) => void;
private _rejectPromise!: (reason: unknown) => void;
private readonly _onDidChangeState = new Emitter<TaskState>();
readonly onDidChangeState: Event<TaskState> = this._onDidChangeState.event;
private readonly _onDidOutput = new Emitter<string>();
readonly onDidOutput: Event<string> = this._onDidOutput.event;
readonly result: Promise<T>;
private _disposed = false;
constructor(readonly id: string) {
trackDisposable(this);
this.result = new Promise<T>((resolve, reject) => {
this._resolvePromise = resolve;
this._rejectPromise = reject;
});
void this.result.catch(() => {});
}
get state(): TaskState {
return this._state;
}
resolve(value: T): void {
if (isTerminal(this._state)) return;
this._transition('completed');
this._resolvePromise(value);
}
reject(reason?: unknown): void {
if (isTerminal(this._state)) return;
this._transition('failed');
this._rejectPromise(reason);
}
cancel(): void {
if (isTerminal(this._state)) return;
this._transition('cancelled');
this._rejectPromise(new TaskCancelledError(this.id));
}
dispose(): void {
if (this._disposed) return;
this._disposed = true;
markAsDisposed(this);
this.cancel();
this._onDidChangeState.dispose();
this._onDidOutput.dispose();
}
private _transition(to: TaskState): void {
if (isTerminal(this._state)) return;
this._state = to;
if (!this._disposed) {
this._onDidChangeState.fire(to);
}
}
}
export class TaskService extends Service implements ITaskService {
declare readonly _serviceBrand: undefined;
private _nextId = 0;
run<T>(fn: (signal: AbortSignal, output: (data: string) => void) => Promise<T>): ITaskHandle<T> {
return new RunHandle<T>(this._generateId(), fn);
}
defer<T>(): IDeferredHandle<T> {
return new DeferHandle<T>(this._generateId());
}
private _generateId(): string {
return `task-${this._nextId++}`;
}
}
registerScopedService(
LifecycleScope.App,
ITaskService,
TaskService,
ScopeActivation.OnScopeCreated,
'task',
);
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