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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-62800] Create Condition Variable Helper Class To Enforce State Mutation &amp; Notification Contract</title>
                <link>https://jira.mongodb.org/browse/SERVER-62800</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The inspiration for this ticket originated from the bug fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62682&quot; title=&quot;PrimaryOnlyService Does Not Call _rebuildCV.notify_all() leading to calls to waitForConditionOrInterrupt not being triggered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62682&quot;&gt;&lt;del&gt;SERVER-62682&lt;/del&gt;&lt;/a&gt;. The problem was that the implicit contract of the condition variable used was violated. The underlying _state variable in PrimaryOnlyService was mutated without an accompanying call to the condition variable&apos;s &lt;b&gt;notify_all&lt;/b&gt;. Which lead to threads waiting for a change in _state to not be woken up.&lt;/p&gt;

&lt;p&gt;Instead of relying on the developer remembering to adhere to the contract, we should create a helper class that will explicitly enforce this contract. This would be for a simple condition variable use case that is relatively common: one single state variable that changes and when it changes all threads waiting on a change should be notified.&lt;/p&gt;

&lt;p&gt;From my investigation I think that the class should expose the following functions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;setState(State newState, )&lt;/li&gt;
	&lt;li&gt;waitForStateChange(Function callback)&lt;br/&gt;
The current refactor PrimaryOnlyService serves as a good basis for that class. Specifically the &lt;b&gt;_setState&lt;/b&gt; and &lt;b&gt;_waitForStateNotRebuilding&lt;/b&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Though other solutions that will explicitly enforce the contract for that common pattern will also work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1967613">SERVER-62800</key>
            <summary>Create Condition Variable Helper Class To Enforce State Mutation &amp; Notification Contract</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="luis.osta@mongodb.com">Luis Osta</reporter>
                        <labels>
                            <label>sa-remove-fv-backlog-22</label>
                    </labels>
                <created>Thu, 20 Jan 2022 17:16:34 +0000</created>
                <updated>Tue, 6 Dec 2022 00:38:05 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
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