Salesforce LWC学习(十四) Continuation进行异步callout获取数据

public with sharing class ContinuationDemoController {
    // Callout endpoint as a named credential URL
    // or, as shown here, as the long-running service URL
    private static final String LONG_RUNNING_SERVICE_URL =
        'https://th-apex-http-callout.herokuapp.com/';
    
    // Action method
    @AuraEnabled(continuation=true cacheable=true)
    public static Object startRequest() {
      // Create continuation. Argument is timeout in seconds.
      Continuation con = new Continuation(40);
      // Set callback method
      con.continuationMethod='processResponse';
      // Set state
      con.state='Hello, World!';
      // Create callout request
      HttpRequest req = new HttpRequest();
      req.setMethod('GET');
      req.setEndpoint(LONG_RUNNING_SERVICE_URL);
      // Add callout request to continuation
      con.addHttpRequest(req);
      // Return the continuation
      return con;
    }
    
    // Callback method
    @AuraEnabled(cacheable=true)
    public static Object processResponse(List<String> labels, Object state) {
      // Get the response by using the unique label
      HttpResponse response = Continuation.getResponse(labels[0]);
      // Set the result variable
      String result = response.getBody();
      return result;
    }
}

<template> 
    <div>
        service content: {formattedWireResult}
    </div>    
</template>

import { LightningElement,wire } from 'lwc';
import startRequest from '@salesforce/apexContinuation/ContinuationDemoController.startRequest';
export default class ContinuationComponent extends LightningElement {
    
    // Using wire service
    @wire(startRequest)
    wiredContinuation;

    get formattedWireResult() {
        return JSON.stringify(this.wiredContinuation);
    }

}