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

Added Cancellation.combine(...tokens) method to combine multiple cancellation...

Added Cancellation.combine(...tokens) method to combine multiple cancellation tokens to the aggregated token.

cin - - Load All Authors

File last commit:

r170:1391543e8282 v1.4.5 default


                r170:1391543e8282

v1.4.5 default

Download file

             AsyncComponent.ts
        
                    35 lines
            
             | 1.0 KiB
            
                | video/mp2t
            
             |
                TypeScriptLexer
            
             / src / main / ts / components / AsyncComponent.ts
          
                    History
                
                 |
                  Annotation
                 | Raw
                 |Copy content
                 |Copy permalink

      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);

          }

      }

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				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);
				}
				}