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| <div class="section" id="async-vs-sync-calls"> |
| <h1>Async vs. sync calls<a class="headerlink" href="#async-vs-sync-calls" title="Permalink to this headline">¶</a></h1> |
| <p>The Usergrid SDKs work by making RESTful API calls from your application |
| to the API. In some cases, both synchronous and asynchronous calls are |
| supported for most methods, as in the case of the Usergrid Android SDK, |
| while in others only asynchronous calls are supported, as in the |
| Usergrid JavaScript SDK. The following is a brief explanation of |
| synchronous vs. asynchronous API calls.</p> |
| <div class="section" id="synchronous"> |
| <h2>Synchronous<a class="headerlink" href="#synchronous" title="Permalink to this headline">¶</a></h2> |
| <p>If an API call is synchronous, it means that code execution will block |
| (or wait) for the API call to return before continuing. This means that |
| until a response is returned by the API, your application will not |
| execute any further, which could be perceived by the user as latency or |
| performance lag in your app. Making an API call synchronously can be |
| beneficial, however, if there if code in your app that will only execute |
| properly once the API response is received.</p> |
| </div> |
| <div class="section" id="asynchronous"> |
| <h2>Asynchronous<a class="headerlink" href="#asynchronous" title="Permalink to this headline">¶</a></h2> |
| <p>Asynchronous calls do not block (or wait) for the API call to return |
| from the server. Execution continues on in your program, and when the |
| call returns from the server, a “callback” function is executed. For |
| example, in the following code using the Usergrid JavScript SDK, the |
| function called dogCreateCallback will be called when the create dog API |
| call returns from the server. Meanwhile, execution will continue:</p> |
| <div class="highlight-python"><div class="highlight"><pre>function dogCreateCallback(err, dog) { |
| alert('I will probably be called second'); |
| if (err) { |
| //Error - Dog not created |
| } else { |
| //Success - Dog was created |
| |
| } |
| } |
| |
| client.createEntity({type:'dogs'}, dogCreateCallback); |
| alert('I will probably be called first'); |
| </pre></div> |
| </div> |
| <p>The result of this is that we cannot guarantee the order of the two |
| alert statements. Most likely, the alert right after the createEntity |
| function call will be called first since the API call will take a second |
| or so to complete.</p> |
| <p>The important point is that program execution will continue, and |
| asynchronously, the callback function will be called once program |
| execution completes.</p> |
| </div> |
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