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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
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    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MAGNOLIA-7030] Optimise the usage of AnnotationUtils class</title>
                <link>https://jira.magnolia-cms.com/browse/MAGNOLIA-7030</link>
                <project id="10000" key="MAGNOLIA">Magnolia</project>
                    <description>&lt;p&gt;&lt;tt&gt;AnnotationUtils&lt;/tt&gt; is primarily used by i18n mechanism in order to identify translatable getters and types. Used in conjunction with ProxyToys interceptors &lt;tt&gt;AnnotationUtils&lt;/tt&gt; conducts the look up whether a method has the annotation applied to it. This means that *&lt;b&gt;every i18n-ed definition method call&lt;/b&gt;* results into:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;class hierarchy look-up (we need to get all the parent types and all method implementations and check whether any of them has annotation applied).&lt;/li&gt;
	&lt;li&gt;multiple class/method annotation look-up&lt;/li&gt;
	&lt;li&gt;since Reflections library is used to look-up/filter the annotations, some collections and other garbage objects are created on the way (we are still talking about a getter call!)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Load tests have shown that these reflective operations due to their high amount tend to consume a lot of CPU.&lt;/p&gt;

&lt;p&gt;Easiest way to mitigate the issue is to cache the results of the look-ups:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;cache class hierarchies&lt;/li&gt;
	&lt;li&gt;cache the method/type annotations&lt;br/&gt;
Experiments have proved that this renders the resource consumption by AnnotationUtils to minimum. &lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Potential follow-up:&lt;/b&gt;&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;it still seems that rather frequent I18N-ization calls in UI are causing *&lt;b&gt;some&lt;/b&gt;* resource waste (nothing compared to above but still). This is related to CGLIB bytecode transformations being involved in the process (heavy!). The suggestion here is to consider i18n-ed API for the definition provider. I.e. besides of DefinitionProvider#get() we could also have &lt;tt&gt;DefinitionProvider#getLocalised()&lt;/tt&gt; which will produce an i18n-ised proxy once (until the underlying config changes of course).&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="59464">MAGNOLIA-7030</key>
            <summary>Optimise the usage of AnnotationUtils class</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="1" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/open.png" description="The issue is open and ready for the assignee to start work on it.">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="apchelintcev">Aleksandr Pchelintcev</reporter>
                        <labels>
                            <label>config</label>
                            <label>i18n</label>
                    </labels>
                <created>Wed, 17 May 2017 14:40:42 +0200</created>
                <updated>Sun, 12 Mar 2023 19:51:18 +0100</updated>
                                            <version>5.5.4</version>
                                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
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