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| <label for=m-enblog20180814dubbo-basic-usage--dubbo-provider-configuration-check><a href=/en/blog/2018/08/14/dubbo-basic-usage--dubbo-provider-configuration/ title="Dubbo Basic Usage -- Dubbo Provider Configuration" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814dubbo-basic-usage--dubbo-provider-configuration><span>Dubbo Provider Configuration</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180814manipulating-services-dynamically-via-qos-li><input type=checkbox id=m-enblog20180814manipulating-services-dynamically-via-qos-check> |
| <label for=m-enblog20180814manipulating-services-dynamically-via-qos-check><a href=/en/blog/2018/08/14/manipulating-services-dynamically-via-qos/ title="Manipulating Services Dynamically via QoS" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814manipulating-services-dynamically-via-qos><span>Dubbo QoS Introduction</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180814source-code-analysis-of-spring-boot-dubbo-app-start-and-stop-li><input type=checkbox id=m-enblog20180814source-code-analysis-of-spring-boot-dubbo-app-start-and-stop-check> |
| <label for=m-enblog20180814source-code-analysis-of-spring-boot-dubbo-app-start-and-stop-check><a href=/en/blog/2018/08/14/source-code-analysis-of-spring-boot-dubbo-app-start-and-stop/ title="Source code analysis of spring-boot+Dubbo App start and stop" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814source-code-analysis-of-spring-boot-dubbo-app-start-and-stop><span>Dubbo start/stop in spring boot</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180814implementation-of-cross-language-calls-by-dubbo2js-li><input type=checkbox id=m-enblog20180814implementation-of-cross-language-calls-by-dubbo2js-check> |
| <label for=m-enblog20180814implementation-of-cross-language-calls-by-dubbo2js-check><a href=/en/blog/2018/08/14/implementation-of-cross-language-calls-by-dubbo2.js/ title="Implementation of cross-language calls by Dubbo2.js" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814implementation-of-cross-language-calls-by-dubbo2js><span>dubbo2.js introduction</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180814generic-invoke-of-dubbo-li><input type=checkbox id=m-enblog20180814generic-invoke-of-dubbo-check> |
| <label for=m-enblog20180814generic-invoke-of-dubbo-check><a href=/en/blog/2018/08/14/generic-invoke-of-dubbo/ title="Generic invoke of Dubbo" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814generic-invoke-of-dubbo><span>Generic invoke</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180814native-image-using-graalvm-li><input type=checkbox id=m-enblog20180814native-image-using-graalvm-check> |
| <label for=m-enblog20180814native-image-using-graalvm-check><a href=/en/blog/2018/08/14/native-image-using-graalvm/ title="Native Image using GraalVM" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180814native-image-using-graalvm><span>Native Image</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180810dubbos-load-balance-li><input type=checkbox id=m-enblog20180810dubbos-load-balance-check> |
| <label for=m-enblog20180810dubbos-load-balance-check><a href=/en/blog/2018/08/10/dubbos-load-balance/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180810dubbos-load-balance><span>Dubbo's Load Balance</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180807use-annotations-in-dubbo-li><input type=checkbox id=m-enblog20180807use-annotations-in-dubbo-check> |
| <label for=m-enblog20180807use-annotations-in-dubbo-check><a href=/en/blog/2018/08/07/use-annotations-in-dubbo/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180807use-annotations-in-dubbo><span>Use Annotations In Dubbo</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180807using-zookeeper-in-dubbo-li><input type=checkbox id=m-enblog20180807using-zookeeper-in-dubbo-check> |
| <label for=m-enblog20180807using-zookeeper-in-dubbo-check><a href=/en/blog/2018/08/07/using-zookeeper-in-dubbo/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180807using-zookeeper-in-dubbo><span>Using Zookeeper in Dubbo</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180807dubbo-101-li><input type=checkbox id=m-enblog20180807dubbo-101-check> |
| <label for=m-enblog20180807dubbo-101-check><a href=/en/blog/2018/08/07/dubbo-101/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180807dubbo-101><span>Your First Dubbo Demo</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180730the-third-dubbo-meetup-has-been-held-in-shenzhen-li><input type=checkbox id=m-enblog20180730the-third-dubbo-meetup-has-been-held-in-shenzhen-check> |
| <label for=m-enblog20180730the-third-dubbo-meetup-has-been-held-in-shenzhen-check><a href=/en/blog/2018/07/30/the-third-dubbo-meetup-has-been-held-in-shenzhen/ title="The third Dubbo meetup has been held in Shenzhen" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180730the-third-dubbo-meetup-has-been-held-in-shenzhen><span>The third Dubbo meetup</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180727sentinel-the-flow-sentinel-of-dubbo-services-li><input type=checkbox id=m-enblog20180727sentinel-the-flow-sentinel-of-dubbo-services-check> |
| <label for=m-enblog20180727sentinel-the-flow-sentinel-of-dubbo-services-check><a href=/en/blog/2018/07/27/sentinel-the-flow-sentinel-of-dubbo-services/ title="Sentinel: The flow sentinel of Dubbo services" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180727sentinel-the-flow-sentinel-of-dubbo-services><span>Introduce sentinel</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180712tracking-with-pinpoint-li><input type=checkbox id=m-enblog20180712tracking-with-pinpoint-check> |
| <label for=m-enblog20180712tracking-with-pinpoint-check><a href=/en/blog/2018/07/12/tracking-with-pinpoint/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180712tracking-with-pinpoint><span>Tracking with Pinpoint</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180701your-first-dubbo-filter-li><input type=checkbox id=m-enblog20180701your-first-dubbo-filter-check> |
| <label for=m-enblog20180701your-first-dubbo-filter-check><a href=/en/blog/2018/07/01/your-first-dubbo-filter/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180701your-first-dubbo-filter><span>Your First Dubbo Filter</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180623the-second-dubbo-shanghai-meetup-has-been-held-successfully-li><input type=checkbox id=m-enblog20180623the-second-dubbo-shanghai-meetup-has-been-held-successfully-check> |
| <label for=m-enblog20180623the-second-dubbo-shanghai-meetup-has-been-held-successfully-check><a href=/en/blog/2018/06/23/the-second-dubbo-shanghai-meetup-has-been-held-successfully/ title="The second Dubbo Shanghai meetup has been held successfully" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180623the-second-dubbo-shanghai-meetup-has-been-held-successfully><span>The second Dubbo meetup</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180512the-first-dubbo-meetup-has-been-held-in-beijing-li><input type=checkbox id=m-enblog20180512the-first-dubbo-meetup-has-been-held-in-beijing-check> |
| <label for=m-enblog20180512the-first-dubbo-meetup-has-been-held-in-beijing-check><a href=/en/blog/2018/05/12/the-first-dubbo-meetup-has-been-held-in-beijing/ title="The first Dubbo meetup has been held in Beijing" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180512the-first-dubbo-meetup-has-been-held-in-beijing><span>The first Dubbo meetup</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180502the-apachecon-na-schedule-has-been-announced-li><input type=checkbox id=m-enblog20180502the-apachecon-na-schedule-has-been-announced-check> |
| <label for=m-enblog20180502the-apachecon-na-schedule-has-been-announced-check><a href=/en/blog/2018/05/02/the-apachecon-na-schedule-has-been-announced/ title="The ApacheCon NA schedule has been announced" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180502the-apachecon-na-schedule-has-been-announced><span>ApacheCon NA</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180425the-gsocgoogle-summer-of-code-2018-li><input type=checkbox id=m-enblog20180425the-gsocgoogle-summer-of-code-2018-check> |
| <label for=m-enblog20180425the-gsocgoogle-summer-of-code-2018-check><a href=/en/blog/2018/04/25/the-gsocgoogle-summer-of-code-2018/ title="The GSoC(Google Summer of Code) 2018" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20180425the-gsocgoogle-summer-of-code-2018><span>GSoC 2018</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20180422dubbo-roadmap-is-announced-in-qcon-beijing-2018-li><input type=checkbox id=m-enblog20180422dubbo-roadmap-is-announced-in-qcon-beijing-2018-check> |
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| <label for=m-enblogproposals-check><a href=/en/blog/proposals/ title="Proposals About Apache Dubbo" class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enblogproposals><span>Proposals</span></a></label><ul class="ul-2 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog10101application-level-service-discovery-li><input type=checkbox id=m-enblog10101application-level-service-discovery-check> |
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| <label for=m-enblog10101enhanced-http-standard-capabilities-of-triple-protocol-check><a href=/en/blog/1/01/01/enhanced-http-standard-capabilities-of-triple-protocol/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog10101enhanced-http-standard-capabilities-of-triple-protocol><span>Enhanced HTTP Standard Capabilities of Triple Protocol</span></a></label></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-enblogreleases-li><input type=checkbox id=m-enblogreleases-check> |
| <label for=m-enblogreleases-check><a href=/en/blog/releases/ title="New Releases" class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enblogreleases><span>Releases</span></a></label><ul class="ul-2 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog202109202714-release-note-li><input type=checkbox id=m-enblog202109202714-release-note-check> |
| <label for=m-enblog202109202714-release-note-check><a href=/en/blog/2021/09/20/2.7.14-release-note/ title="2.7.14 Release Note" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog202109202714-release-note><span>2.7.14</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog202108233021-release-note-li><input type=checkbox id=m-enblog202108233021-release-note-check> |
| <label for=m-enblog202108233021-release-note-check><a href=/en/blog/2021/08/23/3.0.2.1-release-note/ title="3.0.2.1 Release Note" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog202108233021-release-note><span>3.0.2.1</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20210818302-release-note-li><input type=checkbox id=m-enblog20210818302-release-note-check> |
| <label for=m-enblog20210818302-release-note-check><a href=/en/blog/2021/08/18/3.0.2-release-note/ title="3.0.2 Release Note" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20210818302-release-note><span>3.0.2</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20210702301-release-note-li><input type=checkbox id=m-enblog20210702301-release-note-check> |
| <label for=m-enblog20210702301-release-note-check><a href=/en/blog/2021/07/02/3.0.1-release-note/ title="3.0.1 Release Note" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20210702301-release-note><span>3.0.1</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enblog20200518past-releases-li><input type=checkbox id=m-enblog20200518past-releases-check> |
| <label for=m-enblog20200518past-releases-check><a href=/en/blog/2020/05/18/past-releases/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enblog20200518past-releases><span>Past Releases</span></a></label></li></ul></li></ul></li></ul></nav></div></div><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main><nav aria-label=breadcrumb class=td-breadcrumbs><ol class=breadcrumb><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/blog/>Blog</a></li><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/blog/news/>Articles</a></li><li class="breadcrumb-item active" aria-current=page><a href=https://cn.dubbo.apache.org/en/blog/2019/02/20/implementation-background-and-practice-of-dubbo-client-asynchronous-interface/ aria-disabled=true class="btn-link disabled">Dubbo Async Client</a></li></ol></nav><section id=deprecation-warning><div class="content deprecation-warning pageinfo outdated-blog"><p>This article is more than one year old. Older articles may contain outdated content. Check that the information in the page has not become incorrect since its publication.</p></div></section><div class=td-content><h1>Implementation background and practice of Dubbo client asynchronous interface</h1><div class=lead>Implementation background and practice of Dubbo client asynchronous interface</div><div class="td-byline mb-4"><time datetime=2019-02-20 class=text-muted>Wednesday, February 20, 2019</time></div><header class=article-meta></header><h2 id=preface>Preface</h2><p><img src=/imgs/blog/dubboasyn_client/1_en.png alt="image | left"></p><p>Let’s start with a brief introduction about the stages of a complete Dubbo invocation.</p><ol><li><p>Biz~ represents business thread, that is, the thread where the business logic is located. Biz~ thread pool may be created and maintained by business itself, most of which may be managed by system framework itself (for example, a web system runs under Tomcat container, Biz~ thread is maintained by Tomcat); IO~ stands for network data processing thread, which is created and maintained by IO framework (such as Netty, Grizzly). Dubbo Remoting’s default Netty implementation is NioEventloopLoopGroup. In addition, according to the binding relationship between Channel and IO thread, IO~ can also be regarded as an acceptable Channel for event messages. Asynchronous processing stages such as Biz and IO are abstractly described in JDK8 as completionstages.</p></li><li><p>As we all know, the way of data communication between threads is shared variables. The data communication between Biz and IO is Queue. Specifically to Dubbo, Biz put a task in EventLoop’s LinkedBlockingQueue in the client side implementation (i.e. the steps labeled in Figure 1 above), and the corresponding Thread in the EventLoop will keep iteration the Queue to keep on executing the information the task contains. Specific code can refer to SingleThreadEventExecutor (by the way, the default is to use in the Netty is capacity-free LinkedBlockingQueue, when the Biz processing rate higher than the rate of network, there seems to be a Memory Leak risk).</p></li><li><p>As shown in the figure above, a standard RPC call passes through four message (event) transfers of 1,2,3,4, respectively are the client business thread sending requests to the client IO thread, the server business logic thread receiving the server IO thread requests, the server logic thread responding to the server IO thread after processing, and the client IO thread receiving the results feedback to the business logic thread.</p></li></ol><h2 id=client-asynchronization>Client Asynchronization</h2><h3 id=background>Background</h3><p>In the Java language (other languages are not clear), a call of the local interface can be transparently converted into the call of remote RPC through the proxy mechanism. Most business parties prefer this programming method similar to the local interface to do remote service invocation. Therefore, although RPC is naturally asynchronous internally, users using Dubbo mostly use synchronization, while asynchrony becomes a minority use scenario. The advantage of synchronization is that the programming model is more in line with the “traditional” habits of the business side. The cost is that the current Biz~threads need to be blocked after the request event represented by 1 in the figure, and can not be awakened until the response processing represented by 4. In the process of 1,2,3,4, which is short in microsecond level and long in second level, the Biz~ thread will be blocked, which will consume thread resources and increase the overhead of system resources.</p><p>Therefore, the motivation of client asynchronization is to save thread resource overhead at the cost of understanding how asynchronization is used. In the synchronous mode, the return type of API interface represents a certain business class, while in the asynchronous case, the response and the request are completely independent events, so it is most suitable for the return type of API interface to be CompletionStage mentioned above, which is the inevitable asynchronization supported by Dubbo on asynchronization. Back to the latest Dubbo release, without changing the interface, you need to register a callback interface to handle the response return event when the service is created.</p><p>The example blow is to illustrate it.</p><h3 id=the-sample>The sample</h3><p>Refer to the example code for event notification: <a href=https://github.com/dubbo/dubbo-samples/tree/master/2-advanced/dubbo-samples-notify>https://github.com/dubbo/dubbo-samples/tree/master/dubbo-samples-notify</a></p><p>Event notification allows the Consumer to trigger ‘oninvoke’, ‘onreturn’ and ‘onthrow’ events, which respectively represent before the call, after the call returns normally, or when an exception occurs.</p><p>You can specify a method for notifying events when configuring the Consumer, such as:</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-xml data-lang=xml><span style=display:flex><span><span style=color:#268bd2><bean</span> id=<span style=color:#2aa198>"demoCallback"</span> class=<span style=color:#2aa198>"com.alibaba.dubbo.samples.notify.impl.NotifyImpl"</span> <span style=color:#268bd2>/></span> |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span><span style=color:#268bd2><dubbo:reference</span> id=<span style=color:#2aa198>"demoService"</span> check=<span style=color:#2aa198>"false"</span> interface=<span style=color:#2aa198>"com.alibaba.dubbo.samples.notify.api.DemoService"</span> version=<span style=color:#2aa198>"1.0.0"</span> group=<span style=color:#2aa198>"cn"</span><span style=color:#268bd2>></span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2><dubbo:method</span> name=<span style=color:#2aa198>"sayHello"</span> onreturn=<span style=color:#2aa198>"demoCallback.onreturn"</span> onthrow=<span style=color:#2aa198>"demoCallback.onthrow"</span><span style=color:#268bd2>/></span> |
| </span></span><span style=display:flex><span><span style=color:#268bd2></dubbo:reference></span> |
| </span></span></code></pre></div><p>The code for NotifyImpl is as follows:</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span><span style=color:#268bd2>public</span> <span style=color:#268bd2>class</span> <span style=color:#268bd2>NotifyImpl</span> <span style=color:#268bd2>implements</span> Notify{ |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2>public</span> Map<span style=color:#719e07><</span>Integer, String<span style=color:#719e07>></span> ret <span style=color:#719e07>=</span> <span style=color:#719e07>new</span> HashMap<span style=color:#719e07><</span>Integer, String<span style=color:#719e07>></span>(); |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2>public</span> <span style=color:#dc322f>void</span> <span style=color:#268bd2>onreturn</span>(String name, <span style=color:#dc322f>int</span> id) { |
| </span></span><span style=display:flex><span> ret.put(id, name); |
| </span></span><span style=display:flex><span> System.out.println(<span style=color:#2aa198>"onreturn: "</span> <span style=color:#719e07>+</span> name); |
| </span></span><span style=display:flex><span> } |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2>public</span> <span style=color:#dc322f>void</span> <span style=color:#268bd2>onthrow</span>(Throwable ex, String name, <span style=color:#dc322f>int</span> id) { |
| </span></span><span style=display:flex><span> System.out.println(<span style=color:#2aa198>"onthrow: "</span> <span style=color:#719e07>+</span> name); |
| </span></span><span style=display:flex><span> } |
| </span></span><span style=display:flex><span>} |
| </span></span></code></pre></div><p>It is important to note that the parameters for the three methods in the custom Notify interface are as follows:</p><ul><li><code>oninvoke</code> The parameters of the method are the same as those of the calling method.</li><li><code>onreturn</code> The first parameter of the method is the return value of the calling method, and the rest is the parameters of the calling method.</li><li><code>onthrow</code> The first parameter to the method is the call exception, and the rest is the parameter to the calling method.</li></ul><p>In the above configuration, the <code>sayHello</code> method is called synchronously, so the execution of the event notification method is also synchronously executed. <code>async=true</code> can be configured to make the method call asynchronous, and the notification event method is also executed asynchronously. In particular, the <code>oninvoke</code> method executes synchronously, regardless of whether it is invoked asynchronously or not.</p><h3 id=practical-advice>Practical advice</h3><ul><li><div data-type=alignment data-value=justify style=text-align:justify><div data-type=p>Logical Non-Strongly dependent results after RPC invocation: Asynchronous callbacks are suitable for client-side asynchronous invocation when the client <strong>is not strongly dependent on the server response</strong>.</div></div></li><li><div data-type=alignment data-value=justify style=text-align:justify><div data-type=p>RX scenario: after learning about reactive programming model, I believe that as long as the programming thinking can embrace reactive and the state machine design of business model can be adjusted appropriately, asynchronous solutions can be applied in all scenarios, so as to achieve better terminal response experience. For Dubbo, the current asynchronous interface model needs to be improved like the reactive model interface in order to make the user more naturally apply the asynchronous interface.</div></div></li></ul><h3 id=conclusions>Conclusions</h3><ul><li>The motivation of client asynchronization is that the request sending and response processing are two different independent events, how the response is handled and in which thread is handled are not required to be coupled with the business logic thread of the request sending event.</li><li>The processing logic of response event callbacks in which thread to process is to be selected according to the situation. It is recommended that if the callback logic is relatively simple, it should be directly in the IO thread; if it contains IO type synchronization operations such as remote access or DB access, it is recommended that it be processed in a separate thread pool.</li></ul><ul class="list-unstyled d-flex justify-content-between align-items-center mb-0 pt-5"><li><a href=/en/blog/2019/02/20/implementation-background-and-practice-of-dubbo-server-asynchronous-interface/ aria-label="Previous - Implementation background and practice of Dubbo server asynchronous interface" class="btn btn-primary"><span class=mr-1>β</span>Previous</a></li><li><a href=/en/blog/2019/04/25/dubbo-extensible-mechanism-source-code-analysis-part-1/ aria-label="Next - Dubbo extensible mechanism source code analysis - part 1" class="btn btn-primary">Next<span class=ml-1>β</span></a></li></ul></div><div id=pre-footer><h2>Feedback</h2><p class=feedback--prompt>Was this page helpful?</p><button class="btn btn-primary mb-4 feedback--yes">Yes</button> |
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