datahub/datahub-web/@datahub/utils/addon/templates/components/concurrency-task-state-handler.hbs

{{#if this.handleAsyncStateOnly}}
  {{#if @task.isRunning}}
    <div class="concurrency-task-state-handler">
      <NachoAnimation::PendulumEllipsis />
    </div>
  {{else}}
    {{yield}}
  {{/if}}
{{else}}
  {{#if @task.last.isError}}
    {{#let (or @errorHeading "An error occurred. Please try again shortly.") as |errorMessage|}}
      {{! Show entity lockup if toggled on, otherwise yield error. This allows this component to be used in interfaces
      where rendering the lockup is not suitable, for example in a button
        <ConcurrencyTaskStateHandler @task=task @showLockup=false>
          <button>
            Click Me!
          </button>
        </ConcurrencyTaskStateHandler>
      }}
      {{#if this.showLockup}}
        <EmptyState
          @heading={{errorMessage}}
        />

        <div class="concurrency-task-state-handler__button-container">
          <button
            type="button"
            class="nacho-button nacho-button--large-inverse"
            onclick={{action this.performTask this.taskArgs}}
          >
            Retry
          </button>
        </div>
      {{else}}
        {{! If the callee requires more flexibility, a custom component to handle rendering the error can be provided
            and will take precedence over the basic message rendering
        }}
        {{#if @customErrorComponent}}
          {{component @customErrorComponent error=@task.last.error message=@errorHeading}}
        {{else}}
          {{errorMessage}}
        {{/if}}
      {{/if}}
    {{/let}}

  {{else}}
    {{#if @task.isRunning}}
      <div class="concurrency-task-state-handler">
        <NachoAnimation::PendulumEllipsis />
      </div>
    {{else}}
      {{yield}}
    {{/if}}
  {{/if}}
{{/if}}