Just describe two basic design concepts which are applied in WebKit.

1. 陈浩
http://blog.csdn.net/horkychen
以小 大见以小 大见
WebKit 中两个小设计

2. AgendaAgenda
rivate Data Class Pattern
AII

3. Private Data Class PatternPrivate Data Class Pattern
绝对的权力必然产生绝对的腐败

4. Country
KingKing
-Slaves
-Properties
-Lands
-Slaves
-Properties
-Lands
+ 内政
+ 外交
- 人事
……
+ 内政
+ 外交
- 人事
……
3. 缺乏 性弹3. 缺乏 性弹
1. 高耦合1. 高耦合
2. 权力泛 来的滥带 风险2. 权力泛 来的滥带 风险

5. friend class ResourceHandleInternal;
OwnPtr<ResourceHandleInternal> d;
friend class ResourceHandleInternal;
OwnPtr<ResourceHandleInternal> d;
内部数据
内部数据
对外接口及业务逻辑
对外接口及业务逻辑
Opaque PointerOpaque Pointer
d-pointerd-pointer
为什么不直接使用私有成员变量？为什么不直接使用私有成员变量？

6. Three benefits of Opaque Pointer
1.To hide detail class implementation.
2.To add new data member without compatibility issue.
3.To includes less header files and get faster compilation time.
Three benefits of Opaque Pointer
1.To hide detail class implementation.
2.To add new data member without compatibility issue.
3.To includes less header files and get faster compilation time.

7. 内部细节的实现逻辑
内部细节的实现逻辑
对外接口及业务逻辑
对外接口及业务逻辑

8. The benefits of Pimpl compared to OP
1.More pure encapsulation.
2.Minimize the coupling.
……
The benefits of Pimpl compared to OP
1.More pure encapsulation.
2.Minimize the coupling.
……

9. 抽象与实现可以分开演进
抽象与实现可以分开演进

10. LibraryLibraryApplicationApplication
Fragile Binary Interface Problem
In C++, when anything in a class definition changes
(even private members) all users of that class must
be recompiled.
Fragile Binary Interface Problem
In C++, when anything in a class definition changes
(even private members) all users of that class must
be recompiled.
Class BClass B Class AClass A
添加新成员
添加新成员

11. RResourceesource AAcquisitioncquisition IIss IInitializationnitialization
简单直接

12. {
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
//Do Something
}
{
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
//Do Something
}
{
++m_scriptNestingLevel;
//Do Something
--m_scriptNestingLevel;
}
{
++m_scriptNestingLevel;
//Do Something
--m_scriptNestingLevel;
}

13. {
++m_scriptNestingLevel;
try
{
//Do Something
}
finally
{
--m_scriptNestingLevel;
}
}
{
++m_scriptNestingLevel;
try
{
//Do Something
}
finally
{
--m_scriptNestingLevel;
}
}
Not supported
in
C++
Not supported
in
C++

14. The idea is that an object's destructor is
responsible for freeing resources.
{
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
//Do Something
}
{
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
//Do Something
}
NestingLevelIncrementer::~NestingLevelIncrementer();NestingLevelIncrementer::~NestingLevelIncrementer();

15. {
MutexLocker locker(m_eventsLock);
//Do Something
}
{
MutexLocker locker(m_eventsLock);
//Do Something
}

17. 好奇好奇 模式 / 规则模式 / 规则 述转述转
以小 大、不断 累……见 积以小 大、不断 累……见 积

18. ore C++ idioms <ore C++ idioms <LINKLINK>>
sing a d-pointer <LINK>sing a d-pointer <LINK>
rivate Data Class Pattern <LINK>rivate Data Class Pattern <LINK>
paque Pointer <LINK>paque Pointer <LINK>
impl idiom <LINK>impl idiom <LINK>
ast Pimpl idiom <LINK>ast Pimpl idiom <LINK>