@freemework/common/lib/esm/cancellation/f_cancellation_token_source_manual.js

Common library of the Freemework Project.

import { FException, FExceptionAggregate } from "../exception/index.js";
import { FCancellationException } from "./f_cancellation_exception.js";
export class FCancellationTokenSourceManual {
    _token;
    _cancelListeners = [];
    _isCancellationRequested;
    constructor() {
        this._isCancellationRequested = false;
        const self = this;
        this._token = {
            get isCancellationRequested() { return self.isCancellationRequested; },
            addCancelListener(cb) { self.addCancelListener(cb); },
            removeCancelListener(cb) { self.removeCancelListener(cb); },
            throwIfCancellationRequested() { self.throwIfCancellationRequested(); }
        };
    }
    get token() { return this._token; }
    get isCancellationRequested() { return this._isCancellationRequested; }
    cancel() {
        if (this._isCancellationRequested) {
            // Prevent to call listeners twice
            return;
        }
        this._isCancellationRequested = true;
        const errors = [];
        if (this._cancelListeners.length > 0) {
            // Release callback. We do not need its anymore
            const cancelListeners = this._cancelListeners.splice(0);
            cancelListeners.forEach(cancelListener => {
                try {
                    cancelListener();
                }
                catch (e) {
                    errors.push(FException.wrapIfNeeded(e));
                }
            });
        }
        if (errors.length > 0) {
            throw new FExceptionAggregate(errors);
        }
    }
    addCancelListener(cb) {
        this._cancelListeners.push(cb);
    }
    removeCancelListener(cb) {
        const cbIndex = this._cancelListeners.indexOf(cb);
        if (cbIndex !== -1) {
            this._cancelListeners.splice(cbIndex, 1);
        }
    }
    throwIfCancellationRequested() {
        if (this.isCancellationRequested) {
            throw new FCancellationException();
        }
    }
}
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