<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> I have searched the <a href="https://github.com/apache/dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li>[ -] I have checked the <a href="https://github.com/apache/dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Environment</h3>
<ul dir="auto">
<li>Dubbo version: 2.7.3</li>
</ul>
<h3 dir="auto">Steps to reproduce this issue</h3>
<ul dir="auto">
<li></li>
</ul>
<h3 dir="auto">Expected Result</h3>
<ul dir="auto">
<li></li>
</ul>
<h3 dir="auto">Actual Result</h3>
<ul dir="auto">
<li></li>
</ul>
<div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="    // private 应该改为  private static 保持统一
    static private class DestroyableExporter&lt;T&gt; implements Exporter&lt;T&gt; {
          // 省略
    }"><pre class="notranslate">    <span class="pl-c">// private 应该改为  private static 保持统一</span>
    <span class="pl-k">static</span> <span class="pl-k">private</span> <span class="pl-k">class</span> <span class="pl-smi">DestroyableExporter</span>&lt;<span class="pl-smi">T</span>&gt; <span class="pl-k">implements</span> <span class="pl-smi">Exporter</span>&lt;<span class="pl-smi">T</span>&gt; {
          <span class="pl-c">// 省略</span>
    }</pre></div>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/apache/incubator-dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/apache/incubator-dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Environment</h3>
<ul dir="auto">
<li>Dubbo version: 2.7</li>
<li>Operating System version: Ubuntu 16.04 x64</li>
<li>Java version: 1.7</li>
</ul>
<h3 dir="auto">Steps to reproduce this issue</h3>
<p dir="auto">是这样的，我在想为什么dubbo2.7的异步调用返回的结果不用ChannelFurture去实现呢</p>
<p dir="auto">Pls. provide [GitHub address] to reproduce this issue.</p>
<p dir="auto">Example：<a href="https://netty.io/4.0/api/io/netty/channel/ChannelFuture.html" rel="nofollow">https://netty.io/4.0/api/io/netty/channel/ChannelFuture.html</a></p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/20021404/54796253-6a0dd500-4c8a-11e9-9e37-ac474ff9acc5.png"><img src="https://user-images.githubusercontent.com/20021404/54796253-6a0dd500-4c8a-11e9-9e37-ac474ff9acc5.png" alt="channelFutrue" style="max-width: 100%;"></a></p>