implab/implabjs-core Files · src/main/ts/CancellationAggregate.ts

Added tag v1.4.5 for changeset

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             CancellationAggregate.ts
        
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             / src / main / ts / CancellationAggregate.ts
          
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        cin
    
Added Cancellation.combine(...tokens) method to combine multiple cancellation...

              r170
            
      import { ICancellation, IDestroyable } from "./interfaces";

      export class CancellationAggregate implements ICancellation {

          private readonly _tokens: ICancellation[];

          constructor(tokens: ICancellation[]) {

              this._tokens = tokens || [];

          }

          throwIfRequested() {

              this._tokens.forEach(ct => ct.throwIfRequested());

          }

          isRequested() {

              return this._tokens.some(ct => ct.isRequested());

          }

          isSupported() {

              return !!this._tokens.length;

          }

          register(cb: (e: any) => void): IDestroyable {

              let fired = false;

              const once = (e: any) => {

                  if (!fired) {

                      fired = true;

                      destroy();

                      cb(e);

                  }

              }

              const destroy = () => subscriptions

                  .splice(0,subscriptions.length) // empty array

                  .forEach(subscription => subscription.destroy()); // cleanup

              const subscriptions = this._tokens.map(ct => ct.register(once))

              return {

                  destroy

              };

          }

      }

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cin Added Cancellation.combine(...tokens) method to combine multiple cancellation...	r170	import { ICancellation, IDestroyable } from "./interfaces";

		export class CancellationAggregate implements ICancellation {
		private readonly _tokens: ICancellation[];

		constructor(tokens: ICancellation[]) {
		this._tokens = tokens \|\| [];
		}

		throwIfRequested() {
		this._tokens.forEach(ct => ct.throwIfRequested());
		}

		isRequested() {
		return this._tokens.some(ct => ct.isRequested());
		}
		isSupported() {
		return !!this._tokens.length;
		}
		register(cb: (e: any) => void): IDestroyable {
		let fired = false;

		const once = (e: any) => {
		if (!fired) {
		fired = true;
		destroy();
		cb(e);
		}
		}

		const destroy = () => subscriptions
		.splice(0,subscriptions.length) // empty array
		.forEach(subscription => subscription.destroy()); // cleanup

		const subscriptions = this._tokens.map(ct => ct.register(once))

		return {
		destroy
		};
		}
		}