Spring ObjectProvider

	T getObject(Object... args) throws BeansException;

	T getIfAvailable() throws BeansException;

	T getIfUnique() throws BeansException;

	default T getIfAvailable(Supplier<T> defaultSupplier) throws BeansException {
		// 获取 bean 实例
		T dependency = getIfAvailable();
		// 从容器中获取 , 从入参调用 get 方法后获取
		return (dependency != null ? dependency : defaultSupplier.get());
	}

	default void ifAvailable(Consumer<T> dependencyConsumer) throws BeansException {
		// 获取bean实例
		T dependency = getIfAvailable();
		if (dependency != null) {
			// 执行 accept 方法
			dependencyConsumer.accept(dependency);
		}
	}

	default T getIfUnique(Supplier<T> defaultSupplier) throws BeansException {
		T dependency = getIfUnique();
		return (dependency != null ? dependency : defaultSupplier.get());
	}

	default void ifUnique(Consumer<T> dependencyConsumer) throws BeansException {
		T dependency = getIfUnique();
		if (dependency != null) {
			dependencyConsumer.accept(dependency);
		}
	}