This method returns a message context property if one has been set, otherwise it returns the value of the defined mediation parameter.
如果设置了消息上下文属性，此方法会返回此属性，否则它将返回定义的中介参数的值。
If the property value matches the search value, then the method has successfully found the desired test object and returns it.
如果属性值与搜索值匹配，那么该方法就成功地找到预期的测试对象，并返回该对象。
A method is called in that code when a property value changes and when the property is properly wired to the actions component.
属性值发生更改时、属性被适当地连接到操作组件时，将在这段代码中调用方法。
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