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

Async operation cancellation proposal...

Async operation cancellation proposal ActivatableMixin

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

      import { EmptyCancellation } from "../EmptyCancellation";

      export class AsyncComponent {

          _completion: Promise<void>;

          _deferred: {

              resolve(): void

              reject(reason: any): void

          };

          getCompletion() { return this._completion };

          startOperation(ct: ICancellation = EmptyCancellation.default) {

              if (this._deferred)

                  throw new Error("The async operation is already pending");

              this._completion = new Promise<void>((resolve, reject) => {

                  this._deferred = {

                      resolve: resolve,

                      reject: reject

                  }

              });

              return ct;

          }

          completeSuccess() {

              this._deferred.resolve();

              this._deferred = null;

          }

          completeFail(reason: any) {

              this._deferred.reject(reason);

              this._deferred = null;

          }

          async runOperation(cb: (ct: ICancellation) => Promise<void>, ct: ICancellation = EmptyCancellation.default) {

              //safe.argumentNotNull(cb, "cb")

              ct = this.startOperation(ct);

              try {

                  await cb(ct);

                  this.completeSuccess();

              } catch(e) {

                  this.completeFail(e);

              }

          }

      }

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				import { ICancellation } from "../ICancellation";
				import { EmptyCancellation } from "../EmptyCancellation";

				export class AsyncComponent {
				_completion: Promise<void>;

				_deferred: {
				resolve(): void
				reject(reason: any): void
				};

				getCompletion() { return this._completion };

				startOperation(ct: ICancellation = EmptyCancellation.default) {
				if (this._deferred)
				throw new Error("The async operation is already pending");

				this._completion = new Promise<void>((resolve, reject) => {
				this._deferred = {
				resolve: resolve,
				reject: reject
				}
				});
				return ct;
				}

				completeSuccess() {
				this._deferred.resolve();
				this._deferred = null;
				}

				completeFail(reason: any) {
				this._deferred.reject(reason);
				this._deferred = null;
				}

				async runOperation(cb: (ct: ICancellation) => Promise<void>, ct: ICancellation = EmptyCancellation.default) {
				//safe.argumentNotNull(cb, "cb")
				ct = this.startOperation(ct);
				try {
				await cb(ct);
				this.completeSuccess();
				} catch(e) {
				this.completeFail(e);
				}
				}
				}