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通信连接组件 · App Inventor 2 中文网
...缓存一些用户个性数据、身份验证信息等。常见的如“30天免登陆”功能就是将用户登录验证信息保存到Cookies，有效期30天。还有诸如你的搜索偏好，浏览偏好等设置也是通过Cookies进行保存的）
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How does a public key verify a signature?
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10
@Jodimoro, Technically a message is NOT "Secret" if it's encrypted with a private key. If it's encrypted with a private key anyone with th...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
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1075
Let's say you have a collection of Car objects (database rows), and each Car has a collection ...
Abusing the algebra of algebraic data types - why does this work?
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140
Disclaimer: A lot of this doesn't really work quite right when you account for ⊥, so I'm going...
Can someone explain __all__ in Python?
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edited Mar 8 '17 at 15:50
answered Sep 4 '08 at 21:30
Jim...
How to declare global variables in Android?
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I wrote this answer back in '09 when Android was relatively new, and there were many not well established areas in Android development. I have added a long addendum at the bottom of this post, addressing some criticism, and detailing a philosophical disa...
Creating a singleton in Python
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+50
Use a Metaclass
I would recommend Method #2, but you're better off using a metaclass than a base class. Here is a sample implementatio...
REST vs JSON-RPC? [closed]
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+50
The fundamental problem with RPC is coupling. RPC clients become tightly coupled to service implementation in several ways and it beco...
How do cache lines work?
...recast a memory access (and prefetch it), the retrieval process can take ~90 nanoseconds, or ~250 clock cycles (from the CPU knowing the address to the CPU receiving data).
By contrast, a hit in L1 cache has a load-use latency of 3 or 4 cycles, and a store-reload has a store-forwarding latency of 4...