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| <h1 class="page">Mocking the Clock</h1> |
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| <div class="paragraph"> |
| <p>It’s often useful to be able to change the effective time that a test runs. |
| The framework itself uses the <a href="../../../../refguide/latest/applib-svc/ClockService.html" class="page"><code>ClockService</code></a> to obtain the current time, and applications should also use this domain service for a consistent view of the current time.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This page describes how to change the current time, and how to set up tests using fixture scripts with a mocked time.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="fixtureclock"><a class="anchor" href="#fixtureclock"></a>FixtureClock</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The default <a href="../../../../refguide/latest/applib-svc/ClockService.html" class="page"><code>ClockService</code></a> implementation in fact simply delegates to another class defined in the API, namely the <code>o.a.i.applib.clock.Clock</code>, an abstract singleton class. |
| It is not recommended that your code use the <code>Clock</code> directly, but it’s worth understanding how this all works.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If running in <a href="../../../../refguide/latest/config/about.html#deployment-types" class="page">production</a> (server) mode, then the framework will (lazily) instantiate the <code>`SystemClock</code> when first required. |
| This is a read-only clock that reads from the system time. |
| The instance registers itself as the singleton and cannot be replaced.</p> |
| </li> |
| <li> |
| <p>If running in <a href="../../../../refguide/latest/config/about.html#deployment-types" class="page">prototype</a> mode, though, then the framework (using <code>FixturesLifecycleService</code>) will instead instantiate <code>FixtureClock</code>. |
| This is a read-write clock that will behave as the system clock, unless it is explicitly set using eg, <code>FixtureClock#setDate(…​)</code> or <code>FixtureClock#setTime(…​)</code> etc.</p> |
| <div class="admonitionblock warning"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-warning" title="Warning"></i> |
| </td> |
| <td class="content"> |
| TODO: v2 - looking now to remove Clock singleton, so refactor FixtureClock and TickingFixtureClock with alternative implementations of ClockService. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Moreover, the <code>FixtureClock</code> singleton can be replaced with another implementation. |
| And, it is sometimes useful to replace it using <code>TickingFixtureClock</code>, a subclass that is very similar to <code>FixtureClock</code> (in that the time can be changed) but which will continue to tick once set.</p> |
| </div> |
| <div class="admonitionblock warning"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-warning" title="Warning"></i> |
| </td> |
| <td class="content"> |
| TODO: v2 - this is currently broken; there is nothing that actually instantiates and installs the TickingFixtureClock. |
| Will be superceded as a requirement if refactor to provide alternative ClockService implementations instead. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="tickingclockfixture"><a class="anchor" href="#tickingclockfixture"></a>TickingClockFixture</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>TickingClockFixture</code> is a pre-built fixture script that resets the date/time returned by the <a href="../../../../refguide/latest/applib-svc/ClockService.html" class="page"><code>ClockService</code></a> to a known value.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Thereafter the time returned continues to tick forward (as would the real clock) until reset once more.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, to set the clock to return "3 Sept 2014", use:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">executionContext.executeChild(this, new TickingClockFixture().setTo("2014-09-03"));</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>A variety of format strings are supported; the format "YYYY-MM-DD" (as shown above) will work in every locale.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| This fixture script requires that a <code>TickingFixtureClock</code> is initialized during bootstrapping. |
| </td> |
| </tr> |
| </table> |
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