Guice 泛型类型注入
Guice generic type injection
假设我有一个通用的 class 如下:
public class Base<T extends Stoppable> {
protected final Injector injector;
protected T stoppable;
public Base(Module... module) {
injector = Guice.createInjector(module);
Key<T> key = Key.get(new TypeLiteral<T>() {}); <-- T cannot be used as a key; It is not fully specified.
stoppable = injector.getInstance(key);
}
}
Stoppable
类型的实例使用 Multibinder
绑定:
Multibinder<Stoppable> taskBinder =
Multibinder.newSetBinder(binder, Stoppable.class);
taskBinder.addBinding().to(MyClass.class);
有可能实现吗?
不,不可能以您尝试的方式实现。
但是您可以将 Class
/Type
对象传递给 Base
的构造函数并使用它来创建所需的类型文字,例如(我使用 Set
作为键,因为你提到了 multibinder):
public class Base<T extends Stoppable> {
protected final Injector injector;
protected T stoppable;
public Base(Class<T> type, Module... module) {
injector = Guice.createInjector(module);
var key = Key.get(com.google.inject.util.Types.setOf(type));
stoppable = injector.getInstance(key);
}
}
假设我有一个通用的 class 如下:
public class Base<T extends Stoppable> {
protected final Injector injector;
protected T stoppable;
public Base(Module... module) {
injector = Guice.createInjector(module);
Key<T> key = Key.get(new TypeLiteral<T>() {}); <-- T cannot be used as a key; It is not fully specified.
stoppable = injector.getInstance(key);
}
}
Stoppable
类型的实例使用 Multibinder
绑定:
Multibinder<Stoppable> taskBinder =
Multibinder.newSetBinder(binder, Stoppable.class);
taskBinder.addBinding().to(MyClass.class);
有可能实现吗?
不,不可能以您尝试的方式实现。
但是您可以将 Class
/Type
对象传递给 Base
的构造函数并使用它来创建所需的类型文字,例如(我使用 Set
作为键,因为你提到了 multibinder):
public class Base<T extends Stoppable> {
protected final Injector injector;
protected T stoppable;
public Base(Class<T> type, Module... module) {
injector = Guice.createInjector(module);
var key = Key.get(com.google.inject.util.Types.setOf(type));
stoppable = injector.getInstance(key);
}
}