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| <div class="edit-this-page"><a href="https://github.com/apache/isis/edit/2.0.0-M3/api/applib/src/main/adoc/modules/applib-svc/pages/ClockService.adoc">Edit</a></div> |
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| <a name="section-top"></a> |
| <h1 class="page"><code>ClockService</code></h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Most applications deal with dates and times in one way or another. |
| For example, if an <code>Order</code> is placed, then the <code>Customer</code> may have 30 days to pay the <code>Invoice</code>, otherwise a penalty may be levied.</p> |
| </div> |
| <div class="paragraph"> |
| <p>However, such date/time related functionality can quickly complicate automated testing: "today+30" will be a different value every time the test is run.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Even disregarding testing, there may be a requirement to ensure that date/times are obtained from an NNTP server (rather than the system PC). |
| While instantiating a <code>java.util.Date</code> to current the current time is painless enough, we would not want complex technical logic for querying an NNTP server spread around domain logic code.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Therefore it’s common to provide a domain service whose responsibility is to provide the current time. |
| This service can be injected into any domain object (and can be mocked out for unit testing). |
| Apache Isis provides such a facade through the <code>ClockService</code>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="api"><a class="anchor" href="#api"></a>API</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The API defined by <code>ClockService</code> is:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Service |
| @Named("isisApplib.ClockService") |
| @Order(OrderPrecedence.MIDPOINT) |
| @Primary |
| @Qualifier("Default") |
| public class ClockService { |
| |
| public java.time.LocalDate now() { |
| return Clock.getTimeAsLocalDate(); |
| } |
| |
| public java.time.LocalDateTime nowAsLocalDateTime() { |
| return Clock.getTimeAsLocalDateTime(); |
| } |
| |
| public java.time.OffsetDateTime nowAsOffsetDateTime() { |
| return Clock.getTimeAsOffsetDateTime(); |
| } |
| |
| public java.sql.Timestamp nowAsJavaSqlTimestamp() { |
| return Clock.getTimeAsJavaSqlTimestamp(); |
| } |
| |
| public long nowAsMillis() { |
| return Clock.getEpochMillis(); |
| } |
| |
| public java.util.Date nowAsJavaUtilDate() { |
| return new java.util.Date(nowAsMillis()); |
| } |
| |
| public org.joda.time.DateTime nowAsJodaDateTime() { |
| return Clock.getTimeAsJodaDateTime(); |
| } |
| |
| public org.joda.time.LocalDate nowAsJodaLocalDate() { |
| final DateTimeZone timeZone = DateTimeZone.forTimeZone(TimeZone.getDefault()); |
| return new org.joda.time.LocalDate(nowAsMillis(), timeZone); |
| } |
| |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Note that this domain service is also used by the framework itself to obtain the time, so it acts as an SPI as well.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="implementation"><a class="anchor" href="#implementation"></a>Implementation</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This class (<code>o.a.i.applib.services.clock.ClockService</code>) is also the default implementation. |
| The time provided by this default implementation is based on the system clock.</p> |
| </div> |
| </div> |
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