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316 lines
17 KiB
HTML
316 lines
17 KiB
HTML
<div class="header">
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<h1 class="title" title="Package">Package javax.management.relation</h1>
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<div class="docSummary">
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<div class="block">
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提供关系服务的定义。
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</div>
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</div>
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<p>See: <a href="#package.description">描述</a></p>
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</div><div class="contentContainer">
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<ul class="blockList">
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<li class="blockList">
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<table border="0" cellpadding="3" cellspacing="0" class="typeSummary" summary="Interface Summary table, listing interfaces, and an explanation">
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<caption>
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<span>接口摘要</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">接口</th>
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<th class="colLast" scope="col">描述</th>
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</tr>
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</tbody>
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<tbody>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/Relation.html" title="interface in javax.management.relation">Relation</a></td>
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<td class="colLast">
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<div class="block">
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这个接口必须由任何MBean类来实现，该类可以表示使用关系服务管理的关系。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationServiceMBean.html" title="interface in javax.management.relation">RelationServiceMBean</a></td>
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<td class="colLast">
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<div class="block">
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关系服务负责创建和删除关系类型和关系，处理一致性和提供查询机制。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationSupportMBean.html" title="interface in javax.management.relation">RelationSupportMBean</a></td>
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<td class="colLast">
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<div class="block">
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RelationSupport对象由Relation Service内部使用，用于表示任意关系类型的简单关系（只有角色，无属性或方法）以及无限数量的角色。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationType.html" title="interface in javax.management.relation">RelationType</a></td>
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<td class="colLast">
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<div class="block">
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RelationType接口必须由预期表示关系类型的任何类来实现。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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<li class="blockList">
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<table border="0" cellpadding="3" cellspacing="0" class="typeSummary" summary="Class Summary table, listing classes, and an explanation">
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<caption>
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<span>类摘要</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">类</th>
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<th class="colLast" scope="col">描述</th>
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</tr>
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</tbody>
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<tbody>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/MBeanServerNotificationFilter.html" title="class in javax.management.relation">MBeanServerNotificationFilter</a></td>
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<td class="colLast">
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<div class="block">
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<span>筛选<a href="../../../javax/management/MBeanServerNotification.html" title="javax.management中的类"><code>MBeanServerNotification</code></a> 。</span>
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationNotification.html" title="class in javax.management.relation">RelationNotification</a></td>
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<td class="colLast">
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<div class="block">
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关系服务变更通知。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationService.html" title="class in javax.management.relation">RelationService</a></td>
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<td class="colLast">
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<div class="block">
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关系服务负责创建和删除关系类型和关系，处理一致性和提供查询机制。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationSupport.html" title="class in javax.management.relation">RelationSupport</a></td>
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<td class="colLast">
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<div class="block">
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RelationSupport对象由Relation Service内部使用，用于表示任意关系类型的简单关系（只有角色，无属性或方法）以及无限数量的角色。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationTypeSupport.html" title="class in javax.management.relation">RelationTypeSupport</a></td>
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<td class="colLast">
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<div class="block">
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RelationTypeSupport对象实现RelationType接口。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/Role.html" title="class in javax.management.relation">Role</a></td>
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<td class="colLast">
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<div class="block">
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表示角色：包括角色名称和引用的MBean（通过其ObjectNames）。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleInfo.html" title="class in javax.management.relation">RoleInfo</a></td>
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<td class="colLast">
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<div class="block">
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RoleInfo对象总结了关系类型中的角色。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleList.html" title="class in javax.management.relation">RoleList</a></td>
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<td class="colLast">
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<div class="block">
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RoleList表示角色列表（Role对象）。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleResult.html" title="class in javax.management.relation">RoleResult</a></td>
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<td class="colLast">
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<div class="block">
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表示多次访问关系的几个角色（用于阅读或写入）的结果。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleStatus.html" title="class in javax.management.relation">RoleStatus</a></td>
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<td class="colLast">
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<div class="block">
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此类描述访问角色时可能遇到的各种问题。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleUnresolved.html" title="class in javax.management.relation">RoleUnresolved</a></td>
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<td class="colLast">
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<div class="block">
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代表一个未解决的角色：由于问题而无法从关系中检索到的角色。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleUnresolvedList.html" title="class in javax.management.relation">RoleUnresolvedList</a></td>
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<td class="colLast">
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<div class="block">
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RoleUnresolvedList表示RoleUnresolved对象的列表，表示由于在尝试访问（读取或写入）角色时遇到问题，不会从关系中检索到角色。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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<li class="blockList">
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<table border="0" cellpadding="3" cellspacing="0" class="typeSummary" summary="Exception Summary table, listing exceptions, and an explanation">
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<caption>
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<span>异常摘要</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">异常</th>
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<th class="colLast" scope="col">描述</th>
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</tr>
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</tbody>
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<tbody>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/InvalidRelationIdException.html" title="class in javax.management.relation">InvalidRelationIdException</a></td>
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<td class="colLast">
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<div class="block">
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当已经使用关系id提供给关系时，引发异常。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/InvalidRelationServiceException.html" title="class in javax.management.relation">InvalidRelationServiceException</a></td>
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<td class="colLast">
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<div class="block">
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当提供无效的关系服务时，引发异常。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/InvalidRelationTypeException.html" title="class in javax.management.relation">InvalidRelationTypeException</a></td>
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<td class="colLast">
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<div class="block">
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关系类型无效
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/InvalidRoleInfoException.html" title="class in javax.management.relation">InvalidRoleInfoException</a></td>
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<td class="colLast">
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<div class="block">
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当在角色信息中，其最小度大于其最大度时，会引发此异常。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/InvalidRoleValueException.html" title="class in javax.management.relation">InvalidRoleValueException</a></td>
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<td class="colLast">
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<div class="block">
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角色值无效。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationException.html" title="class in javax.management.relation">RelationException</a></td>
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<td class="colLast">
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<div class="block">
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这个类是在关系管理期间可以提出的任何异常的超类。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationNotFoundException.html" title="class in javax.management.relation">RelationNotFoundException</a></td>
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<td class="colLast">
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<div class="block">
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当关系服务中的给定关系ID没有关系时，会引发此异常。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationServiceNotRegisteredException.html" title="class in javax.management.relation">RelationServiceNotRegisteredException</a></td>
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<td class="colLast">
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<div class="block">
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当对关系服务进行访问并且没有注册时，会引发此异常。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RelationTypeNotFoundException.html" title="class in javax.management.relation">RelationTypeNotFoundException</a></td>
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<td class="colLast">
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<div class="block">
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当在关系服务中没有给定名称的关系类型时，引发异常。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleInfoNotFoundException.html" title="class in javax.management.relation">RoleInfoNotFoundException</a></td>
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<td class="colLast">
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<div class="block">
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当给定的关系类型中没有给定名称的角色信息时，会引发此异常。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../javax/management/relation/RoleNotFoundException.html" title="class in javax.management.relation">RoleNotFoundException</a></td>
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<td class="colLast">
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<div class="block">
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当关系中的角色不存在或不可读或不可设置时，引发此异常。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<a name="package.description">
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<!-- --> </a>
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<h2 title="Package javax.management.relation Description">Package javax.management.relation Description</h2>
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<div class="block">
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<p> <span>提供关系服务的定义。</span> <span>关系服务用于记录MBean服务器中的MBean之间的关系。</span> <span>关系服务本身就是一个MBean。</span> <span>可以在MBean服务器中注册一个<a href="../../../javax/management/relation/RelationService.html" title="javax.management.relation中的类"><code>RelationService</code></a> MBean的多个实例。</span> </p>
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<p> <span><em>关系类型</em>定义了MBean之间的关系。</span> <span>它包含了MBeans在关系中<em>扮演的角色</em> 。</span> <span>通常在关系类型中至少有两个角色。</span> </p>
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<p> <span><em>关系</em>是一个关系类型的命名实例，其中特定的MBean出现在角色中，由他们的<a href="../../../javax/management/ObjectName.html" title="javax.management中的类"><code>ObjectName</code>代表</a> 。</span> </p>
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<p> <span>例如，假设有<code>Module</code> MBean，表示应用程序中的模块。</span> <span>一个<code>DependsOn</code>关系类型可以表示某些模块依赖于其他模块的关系，可以用来确定模块启动或停止的顺序。</span> <span><code>DependsOn</code>关系类型有两个角色： <code>dependent</code>和<code>dependedOn</code> 。</span> </p>
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<p> <span>每个角色都是<em>键入的</em> ，这意味着该角色中出现的MBean必须是角色类型的一个实例。</span> <span>在<code>DependsOn</code>示例中，这两个角色的类型为<code>Module</code> 。</span> </p>
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<p> <span>每个角色都有一个<em>基数</em> ，它为给定的关系实例中可以出现在该角色中的MBean的数量提供下限和上限。</span> <span>通常，下限和上限都是1，正好有一个MBean出现在角色中。</span> <span>基数只限制每个关系实例的角色中的MBean的数量。</span> <span>相同的MBean可以在任何数量的关系类型的实例中以相同的角色出现。</span> <span>在<code>DependsOn</code>示例中，给定的模块可以依赖于许多其他模块，并且取决于许多其他模块，但是任何给定的关系实例只链接一个<code>dependent</code>模块，正好一个<code>dependedOn</code>模块。</span> </p>
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<p> <span>可以明确地创建关系类型，作为实现<a href="../../../javax/management/relation/RelationType.html" title="javax.management.relation中的接口"><code>RelationType</code></a>接口的对象，通常为<a href="../../../javax/management/relation/RelationTypeSupport.html" title="javax.management.relation中的类"><code>RelationTypeSupport</code></a> 。</span> <span>或者，可以使用Relation Service的<a href="../../../javax/management/relation/RelationServiceMBean.html#createRelationType-java.lang.String-javax.management.relation.RoleInfo:A-"><code>createRelationType</code></a>方法<a href="../../../javax/management/relation/RelationServiceMBean.html#createRelationType-java.lang.String-javax.management.relation.RoleInfo:A-">隐式</a>创建它。</span> </p>
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<p> <span>可以明确地创建关系实例，作为实现<a href="../../../javax/management/relation/Relation.html" title="javax.management.relation中的接口"><code>Relation</code></a>接口的对象，通常为<a href="../../../javax/management/relation/RelationSupport.html" title="javax.management.relation中的类"><code>RelationSupport</code></a> 。</span> <span>（A <code>RelationSupport</code>本身是一个有效的MBean，所以它可以在MBean服务器中注册，尽管不是必需的）。或者，可以使用Relation Service的<a href="../../../javax/management/relation/RelationServiceMBean.html#createRelation-java.lang.String-java.lang.String-javax.management.relation.RoleList-"><code>createRelation</code></a>方法<a href="../../../javax/management/relation/RelationServiceMBean.html#createRelation-java.lang.String-java.lang.String-javax.management.relation.RoleList-">隐式</a>创建关系实例。</span> </p>
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<p> <span><code>DependsOn</code>示例可能编码如下。</span> </p>
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<pre> <span>import java.util.*;
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import javax.management.*;
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import javax.management.relation.*;
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// ...
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MBeanServer mbs = ...;
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// Create the Relation Service MBean
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ObjectName relSvcName = new ObjectName(":type=RelationService");
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RelationService relSvcObject = new RelationService(true);
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mbs.registerMBean(relSvcObject, relSvcName);
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// Create an MBean proxy for easier access to the Relation Service
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RelationServiceMBean relSvc =
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MBeanServerInvocationHandler.newProxyInstance(mbs, relSvcName,
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RelationServiceMBean.class,
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false);
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// Define the DependsOn relation type
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RoleInfo[] dependsOnRoles = {
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new RoleInfo("dependent", Module.class.getName()),
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new RoleInfo("dependedOn", Module.class.getName())
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};
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relSvc.createRelationType("DependsOn", dependsOnRoles);
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// Now define a relation instance "moduleA DependsOn moduleB"
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ObjectName moduleA = new ObjectName(":type=Module,name=A");
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ObjectName moduleB = new ObjectName(":type=Module,name=B");
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Role dependent = new Role("dependent", Collections.singletonList(moduleA));
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Role dependedOn = new Role("dependedOn", Collections.singletonList(moduleB));
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Role[] roleArray = {dependent, dependedOn};
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RoleList roles = new RoleList(Arrays.asList(roleArray));
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relSvc.createRelation("A-DependsOn-B", "DependsOn", roles);
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// Query the Relation Service to find what modules moduleA depends on
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Map<ObjectName,List<String>> dependentAMap =
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relSvc.findAssociatedMBeans(moduleA, "DependsOn", "dependent");
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Set<ObjectName> dependentASet = dependentAMap.keySet();
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// Set of ObjectName containing moduleB</span> </pre>
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</div>
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<dl>
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<dt>
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<span class="simpleTagLabel">从以下版本开始：</span>
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</dt>
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<dd>
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1.5
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</dd>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../../../technotes/guides/jmx/"> Java Platform documentation on JMX technology</a>, in particular the
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<a href="../../../../technotes/guides/jmx/JMX_1_4_specification.pdf"> JMX Specification, version 1.4</a>
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</dd>
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</dl>
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</div> |