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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CXX-2294] Is it safe to use collection after connection (from which it was created) is destroyed?</title>
                <link>https://jira.mongodb.org/browse/CXX-2294</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;The mongocxx driver API is designed such that you get a connection object from the pool and then you get a database from the connection. Any operations then happen over that connection I assume? So my question is do I need to keep the connection object alive while I use database/collection objects? e.g.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;CollectionWrapper::CollectionWrapper {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; connection = pool.acquire();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; db = connection.database(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;my_database&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; m_collection = db.collection(&quot;my_collection);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;} &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// &amp;lt;&amp;lt; connection object destroyed here but member variable m_collection is still alive&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Or does the fact that I am keeping the collection alive is enough to ensure the connection is not returned to the pool?&lt;/p&gt;</description>
                <environment></environment>
        <key id="1801706">CXX-2294</key>
            <summary>Is it safe to use collection after connection (from which it was created) is destroyed?</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13203">Gone away</resolution>
                                        <assignee username="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="puya@motionmetrics.com">Puya Daravi</reporter>
                        <labels>
                            <label>post-5.0</label>
                    </labels>
                <created>Tue, 29 Jun 2021 02:42:25 +0000</created>
                <updated>Fri, 27 Oct 2023 19:48:21 +0000</updated>
                            <resolved>Tue, 3 Aug 2021 12:00:04 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3977644" author="backlog-server-pm" created="Tue, 3 Aug 2021 12:00:04 +0000"  >&lt;p&gt;There hasn&apos;t been any recent activity on this ticket, so we&apos;re resolving it. Thanks for reaching out! Please feel free to comment on this if you&apos;re able to provide more information.&lt;/p&gt;</comment>
                            <comment id="3950716" author="kevin.albertson" created="Mon, 19 Jul 2021 21:30:26 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=puya%40motionmetrics.com&quot; class=&quot;user-hover&quot; rel=&quot;puya@motionmetrics.com&quot;&gt;puya@motionmetrics.com&lt;/a&gt;, the &lt;a href=&quot;http://mongocxx.org/api/current/classmongocxx_1_1pool_1_1entry.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongocxx::pool::entry&lt;/a&gt; must outlive the derived child &lt;tt&gt;mongocxx::collection&lt;/tt&gt; objects. But&#160;&lt;tt&gt;mongocxx::collection&lt;/tt&gt; objects are relatively cheap. They contain a namespace and optional collection specific options (read concern, write concern, read preference). They are intended to be created/destroyed on demand.&lt;/p&gt;

&lt;p&gt;The lifetime restrictions come from the C driver. A &lt;tt&gt;mongocxx::collection&lt;/tt&gt; wraps a &lt;tt&gt;mongoc_collection_t&lt;/tt&gt;. And a &lt;tt&gt;mongocxx::pool::entry&lt;/tt&gt; wraps a pooled &lt;tt&gt;mongoc_client_t&lt;/tt&gt;. The &lt;a href=&quot;http://mongoc.org/libmongoc/current/lifecycle.html#databases-collections-and-related-objects&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Object Lifecycle&lt;/a&gt; page documents the restriction. A &lt;tt&gt;mongoc_collection_t&lt;/tt&gt; internally retains a pointer to the parent &lt;tt&gt;mongoc_client_t&lt;/tt&gt;.&lt;/p&gt;</comment>
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