uTools-Manuals/docs/java/org/omg/PortableInterceptor/ORBInitializer.html

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     org.omg.PortableInterceptor 
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<h2 class="title" title="Interface ORBInitializer">Interface ORBInitializer</h2>
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<span><a href="../../../org/omg/CORBA/portable/IDLEntity.html" title="界面在org.omg.CORBA.portable中">IDLEntity</a> ， <a href="../../../org/omg/CORBA/Object.html" title="在org.omg.CORBA中的接口">Object</a> ， <a href="../../../org/omg/PortableInterceptor/ORBInitializerOperations.html" title="在org.omg.PortableInterceptor中的接口">ORBInitializerOperations</a> ， <a href="../../../java/io/Serializable.html" title="java.io中的接口">Serializable</a></span>
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<hr/> <br/> <pre>public interface <span class="typeNameLabel">ORBInitializer</span>
extends <a href="../../../org/omg/PortableInterceptor/ORBInitializerOperations.html" title="interface in org.omg.PortableInterceptor">ORBInitializerOperations</a>, <a href="../../../org/omg/CORBA/Object.html" title="interface in org.omg.CORBA">Object</a>, <a href="../../../org/omg/CORBA/portable/IDLEntity.html" title="interface in org.omg.CORBA.portable">IDLEntity</a></pre>
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<span>方便拦截器注册和ORB初始化。</span>
<p> <span>拦截器旨在成为ORB服务获得ORB处理的一种手段，有效地成为ORB的一部分。</span> <span>由于拦截器是ORB的一部分，当<code>ORB.init</code>返回ORB时，拦截器已被注册。</span> <span>在通过电话<code>ORB.init</code>返回后，拦截器无法在ORB上<code>ORB.init</code> 。</span> </p>
<p> <span>通过注册实现ORBInitializer接口的相关联的<code>ORBInitializer</code>对象来注册<code>ORBInitializer</code>器。</span> <span>当在初始化ORB，应当调用每个注册<code>ORBInitializer</code> ，传递一个<code>ORBInitInfo</code>其用于登记其拦截器对象。</span> </p>
<p> <span><b>在Java中注册ORB初始化器</b></span> </p>
<p> <span>ORBInitializers通过Java ORB属性注册。</span> </p>
<p> <span>财产名称的格式如下：</span> </p>
<blockquote>
<span><code> org.omg.PortableInterceptor.ORBInitializerClass.&lt;Service&gt; </code></span>
</blockquote>
<span>其中<code>&lt;Service&gt;</code>是实现的类的字符串名称</span>
<blockquote>
<span><code> org.omg.PortableInterceptor.ORBInitializer </code></span>
</blockquote>
<span>为避免名称冲突，应使用反向DNS名称约定。</span>
<span>例如，如果X公司有三个初始化器，它可以定义以下属性：</span>
<ul>
<li> <code>org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init1</code> </li>
<li> <code>org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init2</code> </li>
<li> <code>org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init3</code> </li>
</ul>
<span>在ORB.init期间，收集以<code>org.omg.PortableInterceptor.ORBInitializerClass</code>开头的ORB属性， <code>&lt;Service&gt;</code>每个属性的<code>&lt;Service&gt;</code>部分，对象应以<code>&lt;Service&gt;</code>字符串作为其类别名称进行<code>pre_init</code> ，并应调用<code>pre_init</code>和<code>post_init</code>方法那个对象。</span>
<span>如果有任何例外，ORB将忽略它们并继续进行。</span>
<p> <span><b><i>例</i></b></span> </p>
<p> <span>例如，由公司X编写的客户端日志服务可能具有以下ORBInitializer实现： <code></code></span> </p>
<pre>  <span><code> package com.x.logging; import org.omg.PortableInterceptor.Interceptor; import org.omg.PortableInterceptor.ORBInitializer; import org.omg.PortableInterceptor.ORBInitInfo; public class LoggingService implements ORBInitializer { void pre_init( ORBInitInfo info ) { // Instantiate the Logging Service s Interceptor. Interceptor interceptor = new LoggingInterceptor(); // Register the Logging Service s Interceptor. info.add_client_request_interceptor( interceptor ); } void post_init( ORBInitInfo info ) { // This service does not need two init points. } } </code></span> </pre>
<span>要使用此日志记录服务运行一个名为<code>MyApp</code>的程序，用户可以键入：</span>
<blockquote>
<span><code> java -Dorg.omg.PortableInterceptor.ORBInitializerClass.com.x.Logging.LoggingService MyApp </code></span>
</blockquote>
<p> <span><b>关于注册拦截器的注意事项</b></span> </p>
<p> <span>请求拦截器以每ORB的形式进行注册。</span> </p>
<p> <span>要实现虚拟的每个对象拦截器，从截取点内查询目标上的策略，以确定它们是否应该做任何工作。</span> </p>
<p> <span>为了实现虚拟的每个POA拦截器，用不同的ORB实例化每个POA。</span> <span>虽然拦截器可能被行政命令，但是关于拦截器的注册没有关于秩序的概念。</span> <span>请求拦截器涉及服务环境。</span> <span>服务上下文没有任何命令，因此请求拦截器无需订单。</span> <span>IOR拦截器涉及标记的组件。</span> <span>标签组件也没有任何命令，因此IOR Interceptor不能有订单。</span> </p>
<p> <span>注册代码应该避免使用ORB（即，主叫<code>ORB.init</code>与所提供的<code>orb_id</code> ）。</span> <span>由于在ORB初始化期间发生注册，因此在此ORB处于此状态时调用的结果未定义。</span> </p>
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<span class="seeLabel">另请参见：</span>
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<span><a href="../../../org/omg/PortableInterceptor/ORBInitInfo.html" title="在org.omg.PortableInterceptor中的接口"><code>ORBInitInfo</code></a></span>
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