Network System Laboratory - Source of sl_cache (E)/Caching

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**Behavior of the Cache Server [#b86c7ba2]

*** Starting of the Cache PUT Server [#n802464e]
The Cache Server([[sl_cache>sl_cache (E)]]) forks a process called the Cache PUT Server at start up.  The Cache PUT Server only functions to save of texture data to the database.~
Consolidating the saving of all cache data in single Cache PUT Server is done for two reasons. 
+To avoid the problem of facing a file lock when data is saved. If only one process is involved in writing data there is no problem managing file locks. 
+It is assumed that only localhost will connect with the Cache PUT Server. As a result, some level of security is achieved.

*** Negotiation with UDP Relay Process [#p45034e3]
When the Relay Server ([[sl_relay>sl_relay (E)]]) is started with a ''-cs'', ''-cp'' or ''-cg'' option, TCP connections are created by Cache Server ([[sl_cache>sl_cache (E)]]) for each UDP Relay Process. When the Cache Server receives a connection from the UDP Relay Process it forks a new Control Process. The Control Process then negotiates with the UDP Relay Process, exchanges connection password and a port number. ~
Therefore, the same number of Cache Control Processes for the Cache Server([[sl_cache>sl_cache (E)]]) as the UDP Relay Processes are started.

When [[sl_relay>sl_relay (E)]] is started with ''-cs'' or ''-cp'' option (when PUT is effective), the Cache Control Process forks the Relay Process to Cache PUT Server.  This process receives texture data from [[sl_relay>sl_relay (E)]], and forwards it to the Cache PUT Server.

The Cache Control Process then enters a loop and waits for a data request from the UDP Relay Process.

*** Response to request [#c92ce9c0]
It waits for a moment.

Backup source of sl_cache (E)/Caching(No. All)
- Cur: 2008-12-21 (Sun) 03:29:18 gambled

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