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| <span class="title">Web UI (Wicket Viewer)</span> |
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| </li> |
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| </li> |
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| </div> |
| </aside> |
| </div> |
| <main role="main"> |
| <div class="toolbar" role="navigation"> |
| <button class="nav-toggle"></button> |
| <a href="../../../docs/latest/about.html" class="home-link"></a> |
| <nav class="breadcrumbs" aria-label="breadcrumbs"> |
| <ul> |
| <li><a href="../about.html">User Guide</a></li> |
| <li><a href="about.html">Command Log</a></li> |
| </ul> |
| </nav> |
| <div class="page-versions"> |
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| <div class="edit-this-page"><a href="https://github.com/apache/causeway/edit/2.0.0/extensions/core/commandlog/adoc/modules/commandlog/pages/about.adoc">Edit</a></div> |
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| <article class="doc"> |
| <a name="section-top"></a> |
| <h1 class="page">Command Log</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <em>Command Log</em> module provides an implementation of <a href="../../../refguide/latest/applib/index/services/publishing/spi/CommandSubscriber.html" class="xref page">CommandSubscriber</a> SPI that persists <a href="../../../refguide/latest/applib/index/services/command/Command.html" class="xref page">Command</a>s using either the <a href="../../../pjpa/latest/about.html" class="xref page">JPA/EclipseLink</a> or <a href="../../../pjdo/latest/about.html" class="xref page">JDO/DataNucleus</a> object store.</p> |
| </div> |
| <div class="paragraph"> |
| <p>One use case is to combine with the <a href="../../../security/latest/audittrail/about.html" class="xref page">Audit Trail</a> extension. |
| The <em>Command Log</em> module logs the action invocations or property edits that the end-user makes, while the <em>audit trail</em> logs the resultant changes in state to domain objects. |
| The two logs are correlated using the <a href="../../../refguide/latest/applib/index/services/iactn/Interaction.html#getInteractionId_" class="xref page">interactionId</a> of the owning <a href="../../../refguide/latest/applib/index/services/iactn/Interaction.html" class="xref page">interaction</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Another use case is to support (persisted) background commands, whereby actions are not invoked immediately but instead persisted and invoked by a background thread; this is described in the <a href="#background-commands">background commands</a> section below.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Sometimes the <a href="../executionlog/about.html" class="xref page">Execution Log</a> extension is also configured with or instead of this extension; see the <a href="#notes">notes</a> below to compare and contrast.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="setup"><a class="anchor" href="#setup"></a>Setup</h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="dependency-management"><a class="anchor" href="#dependency-management"></a>Dependency Management</h3> |
| <div class="paragraph"> |
| <p>Add an entry for the <em>Command Log</em> module’s own BOM:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">pom.xml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependencyManagement> |
| <dependencies> |
| <dependency> |
| <groupId>org.apache.causeway.extensions</groupId> |
| <artifactId>causeway-extensions-commandlog</artifactId> |
| <scope>import</scope> |
| <type>pom</type> |
| <version>2.0.0</version> |
| </dependency> |
| </dependencies> |
| </dependencyManagement></code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="dependencies"><a class="anchor" href="#dependencies"></a>Dependencies / Imports</h3> |
| <div class="paragraph"> |
| <p>In the webapp module of your application, add the following dependency:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">pom.xml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependencies> |
| <dependency> |
| <groupId>org.apache.causeway.extensions</groupId> |
| <artifactId>causeway-extensions-commandlog-persistence-XXX</artifactId> <i class="conum" data-value="1"></i><b>(1)</b> |
| </dependency> |
| </dependencies></code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>either: |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>causeway-extensions-commandlog-persistence-jpa</code> (<a href="../../../pjpa/latest/about.html" class="xref page">JPA/Eclipselink</a>), or</p> |
| </li> |
| <li> |
| <p><code>causeway-extensions-commandlog-persistence-jdo</code> (<a href="../../../pjdo/latest/about.html" class="xref page">JDO/DataNucleus</a>).</p> |
| </li> |
| </ul> |
| </div></td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>In your application’s <a href="../../latest/modules.html#appmanifest" class="xref page">App Manifest</a>, import the CommandLog modules. |
| The exact modules to use will depend upon the persistence mechanism in use:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">AppManifest.java</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Configuration |
| @Import({ |
| ... |
| CausewayModuleExtCommandLogPersistenceXxx.class, <i class="conum" data-value="1"></i><b>(1)</b> |
| ... |
| }) |
| public class AppManifest { |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>either |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>CausewayModuleExtCommandLogPersistenceJpa</code> (<a href="../../../pjpa/latest/about.html" class="xref page">JPA/Eclipselink</a>),or</p> |
| </li> |
| <li> |
| <p><code>CausewayModuleExtCommandLogPersistenceJdo</code>, (<a href="../../../pjdo/latest/about.html" class="xref page">JDO/DataNucleus</a>)</p> |
| </li> |
| </ul> |
| </div></td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>If using <a href="../../../security/latest/secman/about.html" class="xref page">SecMan</a>, you will also need to import the <a href="../../../testing/latest/fixtures/about.html" class="xref page">Fixture</a> module; SecMan uses fixture scripts to seed its entities.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="configure-properties"><a class="anchor" href="#configure-properties"></a>Configuration Properties</h3> |
| <div class="paragraph"> |
| <p>Add the database schema used by the <em>Command Log</em> entities to the configuration file:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">application.yml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">causeway: |
| persistence: |
| schema: |
| auto-create-schemas: causewayExtCommandLog</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Optionally, modify the configuration properties for the <em>Command Log</em> module itself:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">application.yml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">causeway: |
| extensions: |
| command-log: |
| publish-policy: "always" <i class="conum" data-value="1"></i><b>(1)</b></code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>the alternative is <code>"only-if-system-changed"</code>, which suppresses the persisting of `CommandLogEntry`s for commands where no other system state was changed (for example a finder action with safe semantics). |
| <div class="paragraph"> |
| <p>See <a href="../../../refguide/latest/config/sections/causeway.extensions.html#causeway.extensions.command-log.publish-policy" class="xref page">causeway.extensions.command-log.publish-policy</a> configuration property for more details.</p> |
| </div></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="menubar-layout-xml"><a class="anchor" href="#menubar-layout-xml"></a>menubar.layout.xml</h3> |
| <div class="paragraph"> |
| <p>Once configured, the extension provides a number of menu actions. |
| You can use <code>menubars.layout.xml</code> to arrange these as you see fit. |
| To get you started, the following fragment adds all of the actions to an "Activity" secondary menu:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">menubars.layout.xml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><mb:secondary> |
| ... |
| <mb:menu> |
| <mb:named>Activity</mb:named> |
| ... |
| <mb:section> |
| <mb:named>Commands</mb:named> |
| <mb:serviceAction id="activeCommands" objectType="causeway.ext.commandLog.CommandLogMenu"/> |
| <mb:serviceAction id="findMostRecent" objectType="causeway.ext.commandLog.CommandLogMenu"/> |
| <mb:serviceAction id="findCommands" objectType="causeway.ext.commandLog.CommandLogMenu"/> |
| <mb:serviceAction id="findAll" objectType="causeway.ext.commandLog.CommandLogMenu"/> |
| </mb:section> |
| ... |
| </mb:menu> |
| </mb:secondary></code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="secman-security-roles"><a class="anchor" href="#secman-security-roles"></a>SecMan Security Roles</h3> |
| <div class="paragraph"> |
| <p>If <a href="../../../security/latest/secman/about.html" class="xref page">SecMan</a> extension is configured, then permissions must be granted to access the menu actions.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This can be done by granting the role set up by the <a href="../../../refguide/latest/extensions/index/secman/applib/role/seed/CausewayExtCommandLogRoleAndPermissions.html" class="xref page">CausewayExtCommandLogRoleAndPermissions</a> seed fixture script (see its <code>ROLE_NAME</code> constant).</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="user-interface"><a class="anchor" href="#user-interface"></a>User Interface</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The extension provides a number of menu actions and contributions.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The menu actions are as listed in <a href="#menubar-layout-xml">menubar.layout.xml</a>, above. |
| They allow the administrator to query the persisted commands. |
| Typically access to these actions would be restricted, see <a href="#secman-security-roles">security roles</a> above.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The extension also provides these mixins:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="../../../refguide/latest/extensions/index/commandlog/applib/contributions/Object_recentCommands.html" class="xref page">Object_recentCommands</a></p> |
| <div class="paragraph"> |
| <p>This contributes a <code>recentCommands</code> collection to each and every domain object.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This can be explicit positioned through the domain class' own <a href="../../latest/ui-layout-and-hints.html#object-layout" class="xref page">layout file</a>, but this is generally not necessary: it will slot into the tab group in the layout file indicated for unreferenced collections using <code><tabGroup unreferencedCollections="true"></code>.</p> |
| </div> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/extensions/index/commandlog/applib/contributions/HasUsername_recentCommandsByUser.html" class="xref page">HasUsername_recentCommandsByUser</a></p> |
| <div class="paragraph"> |
| <p>This contributes the <code>recentCommandsByUser</code> collection to any domain object that implements the <a href="../../../refguide/latest/applib/index/mixins/security/HasUsername.html" class="xref page">HasUsername</a> interface.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Most notably, this is <a href="../../../security/latest/secman/about.html" class="xref page">SecMan</a> extension’s <a href="../../../refguide/latest/extensions/index/secman/applib/user/dom/ApplicationUser.html" class="xref page">ApplicationUser</a> entity that represents a logged-on user. |
| It is also supported by xref:security:sessionlog:about.adoc</p> |
| </div> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/extensions/index/commandlog/applib/contributions/HasInteractionId_commandLogEntry.html" class="xref page">HasInteractionId_commandLogEntry</a></p> |
| <div class="paragraph"> |
| <p>This contributes the <code>commandLogEntry</code> property to any object implementing <a href="../../../refguide/latest/applib/index/mixins/system/HasInteractionId.html" class="xref page">HasInteractionId</a> interface. |
| Typically these are the entities persisted by the <a href="../executionlog/about.html" class="xref page">Execution Log</a> or <a href="../../../security/latest/audittrail/about.html" class="xref page">Audit Trail</a> extensions, making it easy to traverse between these logs.</p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="background-commands"><a class="anchor" href="#background-commands"></a>Background Commands</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Sometimes we might want to execute an action not immediately in the current users’s thread of control, but instead to perform it in the background; for example any long-running process.</p> |
| </div> |
| <div class="paragraph"> |
| <p>One way to accomplish this is to use <a href="../../../refguide/latest/applib/index/services/wrapper/WrapperFactory.html#asyncWrap_T_AsyncControl" class="xref page">WrapperFactory#asyncWrap(…​)</a>, where the command is executed by another thread obtained from a thread pool (<code>ForkJoinPool.commonPool()</code>). |
| This works well, but has the slight risk that it is not transactionally safe - the async thread executes in its own interaction/transaction, and so might fail even though the initiating command succeeds; or vice versa.</p> |
| </div> |
| <div class="paragraph"> |
| <p>An alternative approach is to use the <a href="../../../refguide/latest/extensions/index/commandlog/applib/dom/BackgroundService.html" class="xref page">BackgroundService</a>. |
| This persists the command as an <code>CommandLogEntry</code> instance, indicating that it is to be executed in the background. |
| Then, a separate thread - eg scheduling using Quartz - can pick up the queued <code>CommandLogEntry</code> and execute it.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="submitting-actions"><a class="anchor" href="#submitting-actions"></a>Submitting Actions</h3> |
| <div class="paragraph"> |
| <p>For example, suppose we have a long-running action to export all the invoices we have received from a supplier, perhaps to be sent to some other system. |
| Assuming that the <code>exportInvoices()</code> action is a regular action on the <code>Supplier</code> domain class, we would use:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">example usage of <code>BackgroundService</code> to invoke a regular action</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Action |
| public void exportInvoices(Supplier supplier) { |
| backgroundService.execute(supplier).exportInvoices(); |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If instead this functionality is implemented as a mixin, we would use something like:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">example usage of <code>BackgroundService</code> to invoke a mixin action:</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Action |
| public void exportInvoices(Supplier supplier) { |
| backgroundService.executeMixin(Supplier_exportInvoices.class, supplier).act(); |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The action being invoked must be part of the Causeway metamodel, in other words it cannot be marked uses |
| <a href="../../../refguide/latest/applib/index/annotation/Programmatic.html" class="xref page">@Programmatic</a> or <a href="../../../refguide/latest/applib/index/annotation/Domain_Exclude.html" class="xref page">@Domain.Exclude</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default all the usual hide/disable/validate rules will be checked, but there are also methods to allow these rules to be skipped.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Behind the scenes this service uses <a href="../../../refguide/latest/applib/index/services/wrapper/WrapperFactory.html#asyncWrap_T_AsyncControl" class="xref page">WrapperFactory#asyncWrap(…​)</a> using <a href="../../../refguide/latest/applib/index/services/wrapper/control/AsyncControl.html#with_ExecutorService" class="xref page">AsyncControl#with(ExecutorService)</a> to pass an implementation of <code>ExecutorService</code> that persists the command as a <code>CommandLogEntry</code> instance.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you require more fine-grained control, you can always just use the <a href="../../../refguide/latest/applib/index/services/wrapper/WrapperFactory.html" class="xref page">WrapperFactory</a> async method yourself. |
| The <code>ExecutorService</code> to use is <a href="../../../refguide/latest/extensions/index/commandlog/applib/dom/BackgroundService_PersistCommandExecutorService.html" class="xref page">BackgroundService.PersistCommandExecutorService</a>. |
| This is a Spring <code>@Service</code> and so can be obtained through injection.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="executing-actions-using-the-quartz-scheduler"><a class="anchor" href="#executing-actions-using-the-quartz-scheduler"></a>Executing Actions using the Quartz scheduler</h3> |
| <div class="paragraph"> |
| <p>Once a command has been persisted as a <code>CommandLogEntry</code>, we require some other process to actually execute the command. |
| The <em>Command Log</em> module includes the <code>RunBackgroundCommandsJob</code>, a <a href="https://www.quartz-scheduler.org/">Quartz</a> job that does exactly this. |
| Each time it is called it will query for any background commands that have not been started, and will execute each (using the <a href="../../../refguide/latest/applib/index/services/command/CommandExecutorService.html" class="xref page">CommandExecutorService</a>).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The job is marked as non re-entrant, so it doesn’t matter how often it is called; we recommend a 10 second delay usually works fine.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To configure Quartz, add the following to your <code>AppManifest</code>:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">AppManifest.java</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class AppManifest { |
| |
| @Bean(name = "RunBackgroundCommandsJob") <i class="conum" data-value="1"></i><b>(1)</b> |
| public JobDetailFactoryBean jobDetail() { |
| val jobDetailFactory = new JobDetailFactoryBean(); |
| jobDetailFactory.setJobClass(RunBackgroundCommandsJob.class); |
| jobDetailFactory.setDurability(true); |
| return jobDetailFactory; |
| } |
| |
| @Bean |
| public SimpleTriggerFactoryBean trigger( |
| final @Qualifier("RunBackgroundCommandsJob") JobDetail job) { <i class="conum" data-value="1"></i><b>(1)</b> |
| val trigger = new SimpleTriggerFactoryBean(); |
| trigger.setJobDetail(job); |
| trigger.setStartDelay(60_000); <i class="conum" data-value="2"></i><b>(2)</b> |
| trigger.setRepeatInterval(10_000); <i class="conum" data-value="3"></i><b>(3)</b> |
| trigger.setRepeatCount(REPEAT_INDEFINITELY); |
| return trigger; |
| } |
| |
| // ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>name and qualify the job (so will not interfere with any other Quartz jobs you may have defined)</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>60 secs to wait for the app to be ready</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>check every 10 seconds</td> |
| </tr> |
| </table> |
| </div> |
| <div class="sect3"> |
| <h4 id="disabling-quartz"><a class="anchor" href="#disabling-quartz"></a>Disabling Quartz</h4> |
| <div class="paragraph"> |
| <p>The <em>Command Log</em> module automatically references the <a href="https://www.quartz-scheduler.org/">Quartz</a> library. |
| If you don’t want to use this functionality and want to exclude quartz, then add an explicit dependency on the <em>Command Log</em> applib but exclude the quartz dependency within it:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">pom.xml</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependencies> |
| <dependency> |
| <groupId>org.apache.causeway.extensions</groupId> |
| <artifactId>causeway-extensions-commandlog-applib</artifactId> |
| <exclusions> |
| <exclusion> |
| <groupId>org.quartz-scheduler</groupId> <i class="conum" data-value="1"></i><b>(1)</b> |
| <artifactId>quartz</artifactId> |
| </exclusion> |
| </exclusions> |
| </dependency> |
| </dependencies></code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>exclude reference to quartz</td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="notes"><a class="anchor" href="#notes"></a>Notes</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Conceptually a <strong>command</strong> represents the <em>intention</em> to execute an action or to edit a property ("before" the change), while an <strong>interaction execution</strong> represents the actual execution itself ("after" the change).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <a href="../../../refguide/latest/applib/index/services/publishing/spi/CommandSubscriber.html" class="xref page">CommandSubscriber</a> SPI and <a href="../../../refguide/latest/applib/index/services/publishing/spi/ExecutionSubscriber.html" class="xref page">ExecutionSubscriber</a> SPI allow either to be subscribed to. |
| From an auditing perspective, their behaviour is quite similar:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>even though a command represents the <em>intention</em> to invoke an action, its <a href="../../../refguide/latest/applib/index/services/publishing/spi/CommandSubscriber.html" class="xref page">CommandSubscriber</a> SPI is only called once the action/property edit has been completed.</p> |
| </li> |
| <li> |
| <p>the <a href="../../../refguide/latest/applib/index/services/publishing/spi/ExecutionSubscriber.html" class="xref page">ExecutionSubscriber</a> is called as soon as the action has completed. |
| In most interactions there will only be a single action called within the interaction, hence these two subscribers will be called at almost the same time with very similar payloads.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>However, there can be some subtle differences:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>the <a href="../../../refguide/latest/applib/index/services/wrapper/WrapperFactory.html" class="xref page">WrapperFactory</a> service allows actions to be invoked "as if" through the user interface. |
| Therefore one action can execute another can execute another, creating a nested call graph of executions.</p> |
| <div class="paragraph"> |
| <p>The <a href="../../../refguide/latest/applib/index/services/publishing/spi/ExecutionSubscriber.html" class="xref page">ExecutionSubscriber</a> is called after each and every execution as it completes, so will be called several times.</p> |
| </div> |
| </li> |
| <li> |
| <p>In contrast, the <a href="../../../refguide/latest/applib/index/services/publishing/spi/CommandSubscriber.html" class="xref page">CommandSubscriber</a> is called only once, for the top-level (outermost) action.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="see-also"><a class="anchor" href="#see-also"></a>See also</h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="../../../refguide/latest/applib/index/services/iactn/Interaction.html" class="xref page">interaction</a></p> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/applib/index/services/iactnlayer/InteractionService.html" class="xref page">InteractionService</a>.</p> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/applib/index/services/wrapper/WrapperFactory.html" class="xref page">WrapperFactory</a> service</p> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/extensions/index/commandlog/applib/dom/BackgroundService.html" class="xref page">BackgroundService</a> service</p> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/applib/index/services/publishing/spi/CommandSubscriber.html" class="xref page">CommandSubscriber</a> SPI</p> |
| </li> |
| <li> |
| <p><a href="../../../refguide/latest/applib/index/services/publishing/spi/ExecutionSubscriber.html" class="xref page">ExecutionSubscriber</a> SPI</p> |
| </li> |
| <li> |
| <p><a href="../executionlog/about.html" class="xref page">Execution Log</a> extension</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
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