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| <h1 class="page"><code>TransactionService</code></h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="admonitionblock warning"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-warning" title="Warning"></i> |
| </td> |
| <td class="content"> |
| TODO: this content has not yet been reviewed/updated for v2.0 |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>TransactionService</code> (and its various supertypes) allows domain objects to influence user transactions.</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 of <code>TransactionService</code> is:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public interface TransactionService { |
| |
| TransactionId currentTransactionId(); <i class="conum" data-value="1"></i><b>(1)</b> |
| |
| TransactionState currentTransactionState(); <i class="conum" data-value="2"></i><b>(2)</b> |
| |
| void flushTransaction(); <i class="conum" data-value="3"></i><b>(3)</b> |
| |
| void nextTransaction(); <i class="conum" data-value="4"></i><b>(4)</b> |
| |
| void executeWithinTransaction(Runnable task); <i class="conum" data-value="5"></i><b>(5)</b> |
| |
| <T> T executeWithinTransaction(Supplier<T> task); <i class="conum" data-value="6"></i><b>(6)</b> |
| |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>obtains the identity of the current transaction. |
| (Note, although there is an internal <code>Transaction</code> object, this isn’t exposed in the API). |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public final class TransactionId implements HasUniqueId { |
| private final UUID uniqueId; |
| private final int sequence; |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>uniqueId</code> is in effect a session Id (eg new id per HTTP request). |
| The sequence is because there could be more than one transaction per request/session.</p> |
| </div></td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>obtains the state of the current transaction: |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public enum TransactionState { |
| NONE, |
| IN_PROGRESS, |
| MUST_ABORT, |
| COMMITTED, |
| ABORTED |
| }</code></pre> |
| </div> |
| </div></td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>If the user interaction creates/persists an object or deletes an object (eg using the |
| <a href="RepositoryService.html" class="page"><code>RepositoryService</code></a>'s <code>persist()</code> or <code>delete()</code> methods), then the framework actually queues up the work and only performs the persistence command either at the end of the transaction or immediately prior to the next query. |
| Performing a flush will cause any pending calls to be performed immediately.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="4"></i><b>4</b></td> |
| <td>The framework automatically start a transaction before each user interaction (action invocation or property edit), and will commit that transaction after the interaction has completed. |
| Under certain circumstances (eg actions used to perform data migration, say, or for large fixture scripts), it can be helpful to programmatically complete one transaction and start another one.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="5"></i><b>5</b></td> |
| <td>Primarily for internal use, will execute the task within the current transaction if there is one, but if there is none then begin and then commit a new transaction for the task.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="6"></i><b>6</b></td> |
| <td>Ditto, but retrieving the task to be performed from the supplier.</td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="implementation"><a class="anchor" href="#implementation"></a>Implementation</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The core framework provides a default implementation of this service, <code>o.a.i.core.runtimeservices.xactn.TransactionServiceSpring</code>.</p> |
| </div> |
| </div> |
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