Spring bean銷毀的過程

一：defaultsingletonbeanregistry之destroysingleton(string beanname)

銷毀單例bean

public

void
destroysingleton
(string beanname)
destroybean
(beanname, disposablebean)
;}

移除快取的單例bean之removesingleton(beanname)

protected

void
removesingleton
(string beanname)
}

銷毀bean之destroybean(string beanname, disposablebean bean)

protected

void
destroybean
(string beanname, disposablebean bean)
for(string dependentbeanname : dependencies)
}// actually destroy the bean now...
if(bean != null)
catch
(throwable ex)
}// trigger destruction of contained beans...
setcontainedbeans =
this
.containedbeanmap.
remove
(beanname);if
(containedbeans != null)
}// remove destroyed bean from other beans' dependencies.
synchronized
(this
.dependentbeanmap)}}
// remove destroyed bean's prepared dependency information.
this
.dependenciesforbeanmap.
remove
(beanname)
;}

二：disposablebeanadapter

上面講到從disposablebeans列表中移除disposablebean物件，現在來看一下spring是如何註冊disposablebean物件的：

public

void
registerdisposablebean
(string beanname, disposablebean bean)
} beanname, object bean, rootbeandefinition mbd)
protected
void
registerdisposablebeanifnecessary
(string beanname, object bean, rootbeandefinition mbd)
else
scope.
registerdestructioncallback
(beanname,
newdisposablebeanadapter
(bean, beanname, mbd,
getbeanpostprocessors()
, acc));
}}}//檢查是否需要銷毀
bean, rootbeandefinition mbd)
protected
boolean
requiresdestruction
(object bean, rootbeandefinition mbd)

disposablebeanadapter中重要方法簡析

1.構造方法

public

disposablebeanadapter
(object bean, string beanname, rootbeandefinition beandefinition,
list
postprocessors, accesscontrolcontext acc)
}else
else
if(paramtypes.length ==1&&
boolean
.class
!= paramtypes[0]
)}}this
.beanpostprocessors =
filterpostprocessors
(postprocessors, bean)
;}

2.尋找銷毀方法

private string inferdestroymethodifnecessary

(object bean, rootbeandefinition beandefinition)
catch
(nosuchmethodexception ex)
catch
(nosuchmethodexception ex2)}}
return null;
}return
(stringutils.
haslength
(destroymethodname)
? destroymethodname : null)
;}

3.bean的銷毀行為之destroy()

public

void
destroy()
}if(this
.invokedisposablebean)
try}
, acc);}
else
}catch
(throwable ex)
else}}
if(this
.destroymethod != null)
elseif(
this
.destroymethodname != null)
}}

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