Package cn.cloudself.query.util.ext

Class EntityProxy<RES>

java.lang.Object

cn.cloudself.query.util.ext.EntityProxy<RES>

public abstract class EntityProxy<RES>
extends Object

Bean代理， 支持生成三种类型的数据:

Map 基本对象 JavaBean BeanProxy的主要目的是虚拟出一个对象.

Usages:

• 使用EntityProxy.fromClass(Class)或EntityProxy.fromBean(BEAN)构造该对象
• 使用EntityProxy.newInstance()创建临时对象EntityProxy.BeanInstance
• 使用EntityProxy.BeanInstance.EntityProxy.BeanInstance.setProperty(java.lang.String, java.lang.Object)设置目标对象的属性
• 使用EntityProxy.BeanInstance.EntityProxy.BeanInstance.getPropertyType(java.lang.String)获取目标某字段的类型
• 使用EntityProxy.BeanInstance.EntityProxy.BeanInstance.toBean()将临时对象转为目标对象

注意点：

内置一个HashMap<Class, EntityProxy>作为缓存，该缓存是不会自动垃圾回收，常规场景(例如SpringBoot)下不会存在问题，因为

1. 虚拟机本来就很少回收.class对象, 往往发生回收(FullGC)时，内存已经不足了，该优化了
2. 本身Entity.class对象和EntityProxy不会占用很多内存。

但是以下场景需要手动清空缓存:
Entity是动态生成的，而且很多 单Tomcat存在多个应用，且应用存在退出行为，而此时，Tomcat容器仍在运行。该场景可以实现ServletContextListener，在contextDestroyed时调用EntityProxy.removeCaches(k -> true)清空缓存

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EntityProxy.BeanInstance<BEAN,RES>
static class	EntityProxy.Parser	Entity or Bean's parser

Method Summary

Modifier and Type	Method	Description
static void	flushCaches(Class<?>... classes)
static void	flushCaches(Predicate<? super Class<?>> filter)
static <BEAN> EntityProxy.BeanInstance<BEAN,BEAN>	fromBean(BEAN instance)	构造一个BeanInstance
static <M extends Map<? super String,?>,BEAN> EntityProxy.BeanInstance<BEAN,M>	fromBean(M instance, Class<BEAN> refer)	构造一个BeanInstance
static <T> EntityProxy<T>	fromClass(Class<T> clazz)
abstract EntityProxy.BeanInstance<RES,RES>	newInstance()
abstract <INSTANCE> EntityProxy.BeanInstance<RES,INSTANCE>	newInstance(INSTANCE instance)
EntityProxy.BeanInstance<RES,Map<String,Object>>	newMapInstance()
<M extends Map<? super String,?>> EntityProxy.BeanInstance<RES,M>	newMapInstance(M map)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

fromClass

@NotNull
public static <T> EntityProxy<T> fromClass(@NotNull
                                           Class<T> clazz)

fromBean

public static <BEAN> EntityProxy.BeanInstance<BEAN,BEAN> fromBean(BEAN instance)

构造一个BeanInstance

Parameters:

instance - 只能为`Java Bean`, 不能为`Map`, 如需为`Map`, 参考fromBean(Map, Class)

fromBean

public static <M extends Map<? super String,?>,BEAN> EntityProxy.BeanInstance<BEAN,M> fromBean(M instance,
                                                                                                                 Class<BEAN> refer)

构造一个BeanInstance

Parameters:

instance - 可以为Map或者JavaBean

refer - 该Map参考的`Bean Class`

newInstance

public abstract EntityProxy.BeanInstance<RES,RES> newInstance()

newInstance

public abstract <INSTANCE> EntityProxy.BeanInstance<RES,INSTANCE> newInstance(INSTANCE instance)

newMapInstance

public <M extends Map<? super String,?>> EntityProxy.BeanInstance<RES,M> newMapInstance(M map)

newMapInstance

public EntityProxy.BeanInstance<RES,Map<String,Object>> newMapInstance()

flushCaches

public static void flushCaches(Predicate<? super Class<?>> filter)

flushCaches

public static void flushCaches(Class<?>... classes)