邓白氏编码®

可以通过设置样式来设置流程图边框

整个Java SE中标准的自定义事件实现就是这个样子，基本上涉及三个角色，即自定义的事件类型、自定义的事件监听器和自定义的事件发布者，关系如图5-4所示

在实现中，需要注意到，为了避免事件处理期间事件监听器的注册或移除操作影响处理过程，我们对事件发布时点的监听器列表进行了一个安全复制（safe-copy）。

组合事件类和监听器，发布事件。有了自定义事件和自定义事件监听器，剩下的就是发布事件，然后让相应的监听器监听并处理事件了。通常情况下，我们会有一个事件发布者（EventPublisher），它本身作为事件源，会在合适的时点，将相应事件发布给对应的事件监听器。

代码清单5-13 自定义事件监听器MethodExecutionEventListener定义 2public interface MethodExecutionEventListener extends EventListener {/**3* 处理方法开始执行的时候发布的MethodExecutionEvent事件*/void onMethodBegin(MethodExecutionEvent evt);/**4* 处理方法执行将结束时候发布的MethodExecutionEvent事件*/void onMethodEnd(MethodExecutionEvent evt);5}事件监听器接口定义首先继承了java.util.EventListener，然后针对不同的事件发布时机提供相应的处理方法定义，最主要的就是，这些处理方法所接受的参数就是MethodExecutionEvent类型的事件。也就是说，我们的自定义事件监听器类只负责监听其对应的自定义事件并进行处理

该接口描述为xxxFactory是非常合适的，很好的表达了1:N的关系

Educational affordances describe how instrumental a technology is in deciding whether and how learning might take place (Kirschner, 2002).

MQ中间件与最终用户提供的应用程序代码(生产者/消费者)之间的桥梁

learning analytics as the collection, analysis, use and appropriate dissemination of student-generated, actionable data with the purpose of creating appropriate cognitive, administrative and effective support for learners.

students and their learning behaviors, gathering data from course management and student information systems in order to improve student success

equity within the context of higher education as access, opportunity, and advancement for all students to eliminate race and income as predictors of student success

l earning analytics is the intentional collection and analysis of student data within the l earning context in order to understand and optimize learning

Social network analysis (SNA) is a collection of methods and tools that could be used to study the relationships, interactions and communications.

Learning Analytics is the development and application of data science methods to the distinct characteristics, needs, and concerns of educational contexts and the data streams they generate for the purpose of better understanding and supporting learning processes and outcomes (see also an earlier definition by Siemens et al., 2011).

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