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From conflue...@apache.org
Subject [CONF] Apache Cayenne Documentation: Lifecycle Callbacks (page edited)
Date Sun, 29 Jul 2007 22:30:00 GMT
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<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC">CAYDOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Lifecycle+Callbacks">Lifecycle
Callbacks</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Lifecycle+Callbacks">Lifecycle
Callbacks</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~andrus">Andrus
Adamchik</a>
            <span class="smallfont">(Jul 29, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=26244&originalVersion=23&revisedVersion=24">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h2><a name="LifecycleCallbacks-LifecycleCallbacks"></a>Lifecycle
Callbacks</h2>
<p><em>(since 3.0M1)</em></p>

<p><em>TODO: annotations, Modeler support</em></p>

<p>Users can register callback methods that will be invoked during the lifecycle of
persistent objects. Callback mechanism matches closely the one defined in the <a href="/confluence/display/CAYDOC/JPA+Guide"
title="JPA Guide">JPA Specification</a> (except that it works with JDK 1.4 and allows
preconfigured listeners). There are seven lifecycle callbacks described below (PrePersist,
PostPersist, PreUpdate, PostUpdate, PreRemove, PostRemove, PostLoad). There are two types
of invocations for each one of them: <b>callback on a persistent object</b> itself
or a <b>callback on  an arbitrary listener object</b>.</p>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Callbacks
feature supercedes the following 1.2/2.0 features:</b><br />
<ul>
	<li>Interception of object state transitions inside <tt>"Persistent.setPersistenceState()"</tt>.</li>
	<li>Event mechanism defined in <tt>"org.apache.cayenne.access.event"</tt>
package. Scheduled for removal in 3.0.</li>
	<li><tt>"DataObject.validateForX"</tt> - it is a good idea to use it strictly
for validation; updating the state before commit should be done via callbacks.</li>
	<li><tt>"DataObject.fetchFinished()"</tt> - scheduled for removal in 3.0</li>
</ul>
</td></tr></table>

<h2><a name="LifecycleCallbacks-CallbackMethodSemantics"></a>Callback Method
Semantics</h2>

<ul>
	<li>No formal interface is required to mark a method to be used for callback (although
<tt>org.apache.cayenne.LifecycleListener</tt> can optionally be implemented for
type-safety and to simplify registration).</li>
	<li>A callback method signature looks like <tt>"void someMethod()"</tt>
<em>for persistent classes</em>.</li>
	<li>It looks like <tt>"void method(Type entityObject)"</tt> <em>for
listener classes</em>.</li>
	<li>A callback method can have an arbitrary name.</li>
	<li>A callback method can use public, private, protected or default access.</li>
	<li>They must NOT be static.</li>
	<li>Callback methods are polymorphic - registering a callback on a superclass (even
if the superclass does not map to an entity) will ensure the callback will be invoked on all
entity subclasses, using the overriding subclass method if applicable.</li>
</ul>


<p>Callback on persistent object example:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class Artist
{ 
   ...

   <span class="code-comment">// a valid callback method
</span>   <span class="code-keyword">protected</span> void setDefaultProperties()
{
      ...
   }
}</pre>
</div></div>


<p>Callback on a listener class example:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class MyListener
{ 
   ...

   <span class="code-comment">// a valid callback method
</span>   <span class="code-keyword">public</span> void initArtist(Artist
a) {
      ...
   }
}</pre>
</div></div>

<h2><a name="LifecycleCallbacks-TypesofCallbacks"></a>Types of Callbacks</h2>


<p>Valid callback types are defined as int constants in the <tt>LifecycleListener</tt>
interface.</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'>Callback</th>
<th class='confluenceTh'>Invoked...</th>
</tr>
<tr>
<td class='confluenceTd'>PrePersist</td>
<td class='confluenceTd'>Within <tt>"ObjectContext.newObject()"</tt> after
ObjectId and ObjectContext are set.</td>
</tr>
<tr>
<td class='confluenceTd'>PreRemove</td>
<td class='confluenceTd'>Before an object is deleted inside <tt>"ObjectContext.deleteObject()"</tt>;
also includes all objects that will be deleted as a result of CASCADE delete rule.</td>
</tr>
<tr>
<td class='confluenceTd'>PreUpdate</td>
<td class='confluenceTd'>Prior to commit (and prior to "validateFor*") within <tt>"ObjectContext.commitChanges()"</tt>
and <tt>"ObjectContext.commitChangesToParent()"</tt></td>
</tr>
<tr>
<td class='confluenceTd'>PostPersist</td>
<td class='confluenceTd'>Within <tt>"ObjectContext.commitChanges()"</tt>,
after commit of a new object is done.</td>
</tr>
<tr>
<td class='confluenceTd'>PostRemove</td>
<td class='confluenceTd'>Within <tt>"ObjectContext.commitChanges()"</tt>,
after commit of a deleted object is done.</td>
</tr>
<tr>
<td class='confluenceTd'>PostUpdate</td>
<td class='confluenceTd'>Within <tt>"ObjectContext.commitChanges()"</tt>,
after commit of a modified object is done.</td>
</tr>
<tr>
<td class='confluenceTd'>PostLoad</td>
<td class='confluenceTd'><ul>
	<li>Within <tt>"ObjectContext.performQuery()"</tt> after the object is
fetched.</li>
	<li>Within <tt>"ObjectContext.rollbackChanges()"</tt> after the object
is reverted.</li>
	<li>Anytime a faulted object is resolved (i.e. if a relationship is fetched.</li>
</ul>
</td>
</tr>
</tbody></table>

<h2><a name="LifecycleCallbacks-RegisteringCallbacks"></a>Registering Callbacks</h2>

<p>Listeners and persistent object callbacks can be mapped in the Modeler <em>(TODO:
GUI not implemented yet</em>)_</p>

<p>Alternatively callbacks can be registered with <tt>LifecycleCallbackRegistry</tt>,
which is shared by all contexts within DataDomain.</p>

<p>Obtaining the shared registry instance:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">import</span> org.apache.cayenne.reflect.LifecycleCallbackRegistry;
...
DataDomain domain = ...
LifecycleCallbackRegistry registry = domain.getEntityResolver().getCallbackRegistry();</pre>
</div></div>


<p>Registry obtained this way already contains callbacks mapped in the DataMap. To add
extra callbacks in runtimes, use various <tt>addListener(...)</tt>  methods. </p>

<p>Adding a listener object that implements <tt>LifecycleListener</tt> interface:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">import</span> org.apache.cayenne.LifecycleListener

<span class="code-keyword">public</span> class MyListener <span class="code-keyword">implements</span>
LifecycleListener {
	<span class="code-keyword">public</span> void prePersist(<span class="code-object">Object</span>
entity) {
		Persistent p = (Persistent) entity;
	    <span class="code-object">System</span>.out.println(<span class="code-quote">"New
object created <span class="code-keyword">for</span> entity "</span> + p.getObjectId().getEntityName());

	}
	
	... 
}

<span class="code-comment">// listen <span class="code-keyword">for</span>
events on a single entity - Artist
</span>registry.addListener(Artist.class, <span class="code-keyword">new</span>
MyListener());

<span class="code-comment">// listen <span class="code-keyword">for</span>
events on ALL entities:
</span>registry.addDefaultListener(<span class="code-keyword">new</span>
MyListener());</pre>
</div></div>

<p>Adding a listener of an arbitrary class</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class MyOtherListener
{
	
	<span class="code-comment">// note that callback method doesn't have to be 
</span>	<span class="code-comment">// <span class="code-keyword">public</span>
or called any predefined name
</span>    void onEntityLoad(<span class="code-object">Object</span> entity)
{
		Persistent p = (Persistent) entity;
	    <span class="code-object">System</span>.out.println(<span class="code-quote">"<span
class="code-object">Object</span> fetched: "</span> + p.getObjectId().getEntityName());

	}
	
	<span class="code-comment">// also we can pass the object already <span class="code-keyword">cast</span>
to the entity class 
</span>	<span class="code-comment">// <span class="code-keyword">if</span>
the method is only going to handle <span class="code-keyword">this</span> type
of entities
</span>	void onArtistChange(Artist artist) {
	    <span class="code-object">System</span>.out.println(<span class="code-quote">"Artist
changed "</span> + artist.getArtistName());	
	}
	
	... 
}

<span class="code-object">Object</span> listener = <span class="code-keyword">new</span>
MyOtherListener();

<span class="code-comment">// listen <span class="code-keyword">for</span>
different events on a single entity - Artist. The same
</span><span class="code-comment">// method can be registered <span class="code-keyword">for</span>
multiple events
</span>registry.addListener(LifecycleListener.PRE_PERSIST, Artist.class, listener, <span
class="code-quote">"onArtistChange"</span>);
registry.addListener(LifecycleListener.PRE_REMOVE, Artist.class, listener, <span class="code-quote">"onArtistChange"</span>);
registry.addListener(LifecycleListener.PRE_UPDATE, Artist.class, listener, <span class="code-quote">"onArtistChange"</span>);

<span class="code-comment">// register another method to listen <span class="code-keyword">for</span>
ALL entities
</span>registry.addListener(LifecycleListener.POST_LOAD, listener, <span class="code-quote">"onEntityLoad"</span>);</pre>
</div></div>

<p>Finally a persistent object can implement callbacks as well, being notified of its
own events:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-comment">// <span class="code-quote">"<span
class="code-keyword">extends</span> _Artist"</span> implies <span class="code-quote">"<span
class="code-keyword">implements</span> Persistent"</span> via a superclass
</span><span class="code-keyword">public</span> class Artist <span class="code-keyword">extends</span>
_Artist {
	
	<span class="code-comment">// note that callback on entity is a no-arg method.
</span>	void onLoad() {
		Persistent p = (Persistent) entity;
	    <span class="code-object">System</span>.out.println(<span class="code-quote">"<span
class="code-object">Object</span> fetched: "</span> + <span class="code-keyword">this</span>);

	}
}

<span class="code-comment">// register Artist class callback
</span>registry.addListener(LifecycleListener.POST_LOAD, Artist.class, <span class="code-quote">"onLoad"</span>);</pre>
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