9、自定义scope和factoryBean.md

自定义scope和factoryBean

1. factoryBean接口
2. 自定义scope
3. @PropertySource
4. @CompoentScan

![](9、自定义scope和factoryBean.assets/image-20221216073958888.png

和第三章产生关系。

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每一次调用都是新的实例。

protyoe

不管是相同线程多次调用getBean，还是多线程多次调用getBean,每次getBean拿到的实例都不一样。

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public class CustomScope implements Scope {

    private ThreadLocal local = new ThreadLocal();

    @Override
    public Object get(String name, ObjectFactory<?> objectFactory) {
        if(local.get() != null) {
            return local.get();
        } else {
            //创建实例
            Object object = objectFactory.getObject();
            local.set(object);
            return object;
        }
    }

    @Override
    public Object remove(String name) {
        Object o = local.get();
        local.remove();
        return o;
    }

    @Override
    public void registerDestructionCallback(String name, Runnable callback) {

    }

    @Override
    public Object resolveContextualObject(String key) {
        return null;
    }

    @Override
    public String getConversationId() {
        return null;
    }
}

什么时候注册进去的、