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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-uk</language>    <build-info>
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        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MAGNOLIA-6693] Introduce proxy-based mutable wrapper utility as alternative to Cloner functionality</title>
                <link>https://jira.magnolia-cms.com/browse/MAGNOLIA-6693</link>
                <project id="10000" key="MAGNOLIA">Magnolia</project>
                    <description>&lt;p&gt;Some use cases require a custom mutable definition to be created from the code to achieve some dynamic functionality (e.g. choose/move dialogs and some other features in UI). Usually such definitions are derived from the existing definitions via cloning in order to prevent modification of the source definition (which is a singleton).&lt;/p&gt;

&lt;p&gt;So far we&apos;ve been using the deep cloning approach provided by &lt;tt&gt;com.rits.cloning.Cloner&lt;/tt&gt; utility. However, there were numerous problems with cloning the definition objects that aren&apos;t merest POJO under the hood. Especially big pain is caused by the proxied objects (e.g. i18n&apos;ized definitions, decorated definitions etc) since internally such objects normally have cross-references (e.g. CGLIB tooling fields) which cause cycle dependencies and stack overflow exceptions during cloning.&lt;/p&gt;

&lt;p&gt;I propose to cure the problem in &apos;homeopathic&apos; way - create a utility that would allow generate a mutable proxy wrapper object:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;all the &lt;b&gt;setter&lt;/b&gt; invocations are recorded&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;getter&lt;/b&gt; invocations either return explicit value provided via a setter previously or a value from the wrapped (i.e. cloned object). When such &apos;fallback&apos; value is returned - it is also wrapped in the same way.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The wrap call could look like this:&lt;br/&gt;
&lt;tt&gt;final ChooseDialogDefinition chooseDialogDefinition = MutableWrapper.wrap(definition);&lt;/tt&gt; &lt;br/&gt;
or&lt;br/&gt;
&lt;tt&gt;final ConfiguredChooseDialogDefinition chooseDialogDefinition = MutableWrapper.wrap(definition, ConfiguredChooseDialogDefinition.class);&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;This way we gain the following:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the original object is never modified,&lt;/li&gt;
	&lt;li&gt;wrapper has the same polymorphic type as the wrapped value (&lt;em&gt;as opposed to the &apos;dumb wrapper&apos; approach which technically can only have that iff &lt;b&gt;all&lt;/b&gt; definition classes would implement a virtual method &lt;tt&gt;T createWrapper(T)&lt;/tt&gt; of some &lt;tt&gt;Wrappable&lt;/tt&gt; interface&lt;/em&gt;)&lt;/li&gt;
	&lt;li&gt;solution would never care about the nature of the wrapped object - it would only care about the return value,&lt;/li&gt;
	&lt;li&gt;&apos;cloning&apos; would happen lazily - sub-objects would be wrapped iff they are queried via a getter.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="53010">MAGNOLIA-6693</key>
            <summary>Introduce proxy-based mutable wrapper utility as alternative to Cloner functionality</summary>
                <type id="2" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10891&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/neutral.gif">Neutral</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="1">Fixed</resolution>
                                        <assignee username="apchelintcev">Aleksandr Pchelintcev</assignee>
                                    <reporter username="apchelintcev">Aleksandr Pchelintcev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Jun 2016 08:41:38 +0200</created>
                <updated>Thu, 9 Feb 2017 14:32:57 +0100</updated>
                            <resolved>Mon, 27 Jun 2016 08:14:07 +0200</resolved>
                                    <version>5.4.7</version>
                                    <fixVersion>5.4.8</fixVersion>
                    <fixVersion>5.5</fixVersion>
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