Guice 简明教程
Google Guice - Just-In-Time Bindings
在绑定模块中定义绑定信息时，Guice 会在需要注入依赖项时使用这些信息。如果没有绑定信息，它会尝试创建即时绑定信息。在绑定模块中存在的绑定信息称为显式绑定信息，具有更高的优先级，而即时绑定信息称为隐式绑定信息。如果两种类型的信息都存在，则会考虑显式绑定信息进行映射。
As bindings are defined in Binding Module, Guice uses them whenever it needs to inject dependencies. In case bindings are not present, it can attempt to create just-in-time bindings. Bindings present in binding module are called explicit bindings and are of higher precedence whereas just-in-time bindings are called implicit bindings. If both type of bindings are present, explicit bindings are considered for mapping.
以下是三种即时绑定信息的示例。
Following are the examples of three types of Just-in-time bindings.
Binding Type |
Description |
Non-private, No-argument constructors are eligible for just-in-time bindings. Another way is to annotate a constructor with @Inject annotation. |
|
@ImplementedBy annotation tells the guice about the implementation class. No binding is required in Binding Module in such a case. |
|
@ProvidedBy annotation tells the guice about the provider of implementation class. No binding is required in Binding Module in such a case. |