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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>
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<item>
            <title>[JAVA-2111] Synchronization mechanism for Java Async Driver </title>
                <link>https://jira.mongodb.org/browse/JAVA-2111</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;I&apos;m using the 3.2.1 Async driver to do the following :&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;while&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;(InputIterator.hasNext()){&lt;/span&gt;&lt;/pre&gt;
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					&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;   MongoCollection.insertOne(document, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&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; SingleResultCallback&amp;lt;Void&amp;gt;(){&lt;/span&gt;&lt;/pre&gt;
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					&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;    &lt;/span&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@Override&lt;/span&gt;&lt;/pre&gt;
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					&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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&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; onResult(Void v, Throwable t) {&lt;/span&gt;&lt;/pre&gt;
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						&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;...&lt;/span&gt;&lt;/pre&gt;
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					&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;MongoClient.close();&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The only issue is that MongoClient is being closed before all of the queued inserts are processed and I&apos;m getting &quot;Pool is closed&quot;. I cannot use &lt;b&gt;CountDownLatch&lt;/b&gt; as I don&apos;t know the size of my &lt;b&gt;InputIterator&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;Does the Async driver provide any synchronization mechanisms that we can use in this case ?  &lt;/p&gt;</description>
                <environment></environment>
        <key id="264132">JAVA-2111</key>
            <summary>Synchronization mechanism for Java Async Driver </summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="amarouni">Abbass Marouni</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Feb 2016 16:06:24 +0000</created>
                <updated>Wed, 11 Sep 2019 19:09:30 +0000</updated>
                            <resolved>Tue, 17 May 2016 10:48:00 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1168185" author="ross@10gen.com" created="Tue, 9 Feb 2016 18:25:25 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=amarouni&quot; class=&quot;user-hover&quot; rel=&quot;amarouni&quot;&gt;amarouni&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the ticket just to note for future as this is a usage question its better suited to the &lt;a href=&quot;https://groups.google.com/forum/#!forum/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user mailinglist&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stackoverflow&lt;/a&gt; as you will reach a boarder audience there.  We often find questions there are more discoverable for future users and help the community as a whole.&lt;/p&gt;

&lt;p&gt;Unfortunately, there isn&apos;t a mechanism as you describe, which would be akin to using some sort of &quot;CountUpLatch&quot; and then counting up on each callback and then &lt;tt&gt;latch.await(N)&lt;/tt&gt; on the latch outside the loop. One way to stop a race condition would be to have a CountDownLatch(1) and then chain the inserts (losing parallelism) and in the last elements callback count down the latch. Doing that in the async driver can be cumbersome and it would be simpler using the RxJava driver as the &lt;tt&gt;Observable&lt;/tt&gt; abstraction is much higher level than callbacks. To improve performance I would also recommending buffering the results and using &lt;tt&gt;collection.insertMany&lt;/tt&gt; - this would reduce the number of network round trips but it would still require chaining to remove any race conditions.&lt;/p&gt;

&lt;p&gt;I hope that helps,&lt;/p&gt;

&lt;p&gt;Ross&lt;/p&gt;</comment>
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