Compliance with the assured QoS assumes that all messages occurring in the physical communication system are already known, and taken into consideration, when design-ing the system. This also applies in particular to infrastructure protocols such as ICMPv6 and NDP.怎么理解

这句话的意思是，符合服务质量的合规性假定在设计系统时已经考虑到了物理通信系统中出现的所有消息，并且已经纳入了考虑。这尤其适用于基础设施协议，例如ICMPv6和NDP。换句话说，设计系统时必须考虑到可能发生的所有情况，以确保系统的性能符合预期，并且符合服务质量的标准。在设计系统时，必须考虑到可能影响服务质量的任何因素，包括网络拥塞、延迟、丢包等因素，并采取相应的措施来减少这些影响。

相关问题

怎么理解Compliance with the assured QoS assumes that all messages occurring in the physical communication system are already known, and taken into consideration, when design-ing the system. This also applies in particular to infrastructure protocols such as ICMPv6 and NDP.

count;
break;
case 5:
cout << "请输入新的定价：";
cin >> books[i].price这句话的意思是，保证服务质量的合规性假定在设计系统时已经考虑到了;
break;
default:
cout << "无效选择！" << endl;
break;
}
cout << "物理通信系统中出现的所有消息，并且已经纳入了考虑。这尤其适用于基础修改成功！" << endl;
return;
}
}
cout << "未找到该书！" << endl;
}

设施协议，例如ICMPv6和NDP。换句话说，设计系统时必须考虑到可能发//按书号删除图书信息
void deleteBook() {
string isbn;
cout << "请输入要删除的书号：";
cin >> isbn;

for (int i = 0; i < books.size(); i++) {
if (books[i].生的所有情况，以确保系统的性能符合预期，并且符合服务质量的标准。在设计系统时，必须考虑到可能影响服务质量的任何因素，包括网络拥塞、延迟isbn == isbn) {
books.erase(books.begin() + i);
cout << "删除成功！" << endl;
return;
、丢包等因素，并采取相应的措施来减少这些影响。

<?xml version="1.0" encoding="UTF-8"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <tomcat-users xmlns="http://tomcat.apache.org/xml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tomcat.apache.org/xml tomcat-users.xsd" version="1.0"> <!-- By default, no user is included in the "manager-gui" role required to operate the "/manager/html" web application. If you wish to use this app, you must define such a user - the username and password are arbitrary. Built-in Tomcat manager roles: - manager-gui - allows access to the HTML GUI and the status pages - manager-script - allows access to the HTTP API and the status pages - manager-jmx - allows access to the JMX proxy and the status pages - manager-status - allows access to the status pages only The users below are wrapped in a comment and are therefore ignored. If you wish to configure one or more of these users for use with the manager web application, do not forget to remove the <!.. ..> that surrounds them. You will also need to set the passwords to something appropriate. --> <!-- <user username="admin" password="<must-be-changed>" roles="manager-gui"/> <user username="robot" password="<must-be-changed>" roles="manager-script"/> --> <!-- The sample user and role entries below are intended for use with the examples web application. They are wrapped in a comment and thus are ignored when reading this file. If you wish to configure these users for use with the examples web application, do not forget to remove the <!.. ..> that surrounds them. You will also need to set the passwords to something appropriate. --> <!-- <role rolename="tomcat"/> <role rolename="role1"/> <user username="tomcat" password="<must-be-changed>" roles="tomcat"/> <user username="both" password="<must-be-changed>" roles="tomcat,role1"/> <user username="role1" password="<must-be-changed>" roles="role1"/> --> </tomcat-users> 这个怎么改

你提供的 'tomcat-users.xml' 文件是一个示例文件，其中包含了一些注释和示例用户角色和用户的声明。你需要根据你的需求对其进行修改。

如果你想要使用示例中的某个用户角色和用户，你需要取消相应部分的注释，并设置适当的密码。例如，如果你想要使用示例中的 `admin` 用户作为 `manager-gui` 角色的用户，你可以将以下行的注释取消，并将 `<must-be-changed>` 替换为你自己的密码：

<!--
<user username="admin" password="<must-be-changed>" roles="manager-gui"/>
-->

同时，如果你想要使用其他示例用户角色和用户，你可以按照相同的方式取消注释并设置密码。

如果你想要定义自己的用户角色和用户，你可以按照以下格式添加新的 `<role>` 和 `<user>` 元素：

<role rolename="your-role-name"/>
<user username="your-username" password="your-password" roles="your-role-name"/>

确保将 `<your-role-name>`, `<your-username>`, 和 `<your-password>` 替换为你自己定义的角色名、用户名和密码。

最后，保存并关闭 'tomcat-users.xml' 文件，并重新启动 Tomcat 服务器。这样你就可以使用修改后的用户角色和用户来进行部署和操作了。