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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>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MGNLUI-6229] Allow DataProvider to handle hasChildren method</title>
                <link>https://jira.magnolia-cms.com/browse/MGNLUI-6229</link>
                <project id="10625" key="MGNLUI">Magnolia UI</project>
                    <description>&lt;p&gt;&lt;b&gt;Background&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;In S3 external dam we have an issue displaying the asset tree for the first time. When there are many buckets (parent folders), it takes a very long time to render the tree for the first time. Then the assets are cached and we don&#8217;t have this issue anymore. Also opening other folders have no problem.&lt;/p&gt;


&lt;p&gt;The main problem is vaadin needs to know whether each parent folder has children or not. To do so, vaadin calls sequentially the hasChildren method in the corresponding HierarchicalDataProvider for the view. In our case info.magnolia.ui.contentapp.FilterableHierarchicalDataProvider implements the hasChildren:&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;
&lt;span class=&quot;code-keyword&quot;&gt;public&lt;/span&gt; &lt;span class=&quot;code-object&quot;&gt;boolean&lt;/span&gt; hasChildren(T item) {
&#160;&#160;&#160;&#160;&lt;span class=&quot;code-keyword&quot;&gt;return&lt;/span&gt; fetchChildren(&lt;span class=&quot;code-keyword&quot;&gt;new&lt;/span&gt; HierarchicalQuery&amp;lt;&amp;gt;(filter, item)).count() &amp;gt; 0;
}&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;This is always translated into a remote API call. As we are able to know in advance whether a bucket has children or not, we would like to override this method to avoid all these remote API calls. Unfortunately we can&#8217;t, as FilterableHierarchicalDataProvider has a private constructor.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Proposed solution&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Remove the hasChildren method from&#160;info.magnolia.ui.contentapp.FilterableHierarchicalDataProvider so instead we would use the parent (HierarchicalDataProviderWrapper)&#160;implementation:&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;
&lt;span class=&quot;code-keyword&quot;&gt;public&lt;/span&gt; &lt;span class=&quot;code-object&quot;&gt;boolean&lt;/span&gt; hasChildren(T item) {
    &lt;span class=&quot;code-keyword&quot;&gt;return&lt;/span&gt; dataProvider().hasChildren(item);
}&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;This would allow to override the implementation appropriately.&lt;/p&gt;</description>
                <environment></environment>
        <key id="90861">MGNLUI-6229</key>
            <summary>Allow DataProvider to handle hasChildren method</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</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="jalonso">Jesus Alonso</assignee>
                                    <reporter username="jalonso">Jesus Alonso</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Sep 2020 14:23:06 +0200</created>
                <updated>Fri, 16 Oct 2020 10:43:32 +0200</updated>
                            <resolved>Fri, 16 Oct 2020 10:43:32 +0200</resolved>
                                    <version>6.2.3</version>
                                    <fixVersion>6.2.4</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="236752" author="jalonso" created="Fri, 16 Oct 2020 10:43:32 +0200"  >&lt;p&gt;Issue fixed&lt;/p&gt;</comment>
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