implab/implabjs-core Files · src/main/ts/components/AsyncComponent.ts

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             AsyncComponent.ts
        
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             / src / main / ts / components / AsyncComponent.ts
          
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      import { Cancellation } from "../Cancellation";

      import { IAsyncComponent, ICancellation, ICancellable } from "../interfaces";

      const noop = () => void (0);

      export class AsyncComponent implements IAsyncComponent, ICancellable {

          _cancel: ((e: any) => void) = noop;

          _completion: Promise<void> = Promise.resolve();

          getCompletion() { return this._completion; }

          runOperation(op: (ct: ICancellation) => any, ct: ICancellation = Cancellation.none) {

              // create inner cancellation bound to the passed cancellation token

              const inner = new Cancellation(cancel => {

                  this._cancel = cancel;

              });

              const guard = async () => {

                  try {

                      return op(Cancellation.combine(ct, inner));

                  } finally {

                      // after the operation is complete we need to cleanup the

                      // resources

                      this._cancel = noop;

                  }

              };

              return this._completion = guard();

          }

          cancel(reason: any) {

              this._cancel(reason);

          }

      }

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				import { Cancellation } from "../Cancellation";
				import { IAsyncComponent, ICancellation, ICancellable } from "../interfaces";

				const noop = () => void (0);

				export class AsyncComponent implements IAsyncComponent, ICancellable {
				_cancel: ((e: any) => void) = noop;

				_completion: Promise<void> = Promise.resolve();

				getCompletion() { return this._completion; }

				runOperation(op: (ct: ICancellation) => any, ct: ICancellation = Cancellation.none) {
				// create inner cancellation bound to the passed cancellation token
				const inner = new Cancellation(cancel => {
				this._cancel = cancel;
				});

				const guard = async () => {
				try {
				return op(Cancellation.combine(ct, inner));
				} finally {
				// after the operation is complete we need to cleanup the
				// resources
				this._cancel = noop;
				}
				};

				return this._completion = guard();
				}

				cancel(reason: any) {
				this._cancel(reason);
				}
				}