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Annotation of libwww/Library/src/WWWCache.html, revision 2.4

2.1       frystyk     1: <HTML>
                      2: <HEAD>
2.2       frystyk     3: <TITLE>W3C Reference Library libwww PERSISTENT CACHE</TITLE>
2.4     ! frystyk     4: <!-- Changed by: Henrik Frystyk Nielsen, 16-Apr-1996 -->
2.1       frystyk     5: <NEXTID N="z11">
                      6: </HEAD>
                      7: <BODY>
                      8: 
                      9: <H1>Declaration of W3C Reference PERSISTENT CACHE MODULE</H1>
                     10: 
                     11: <PRE>
                     12: /*
                     13: **     (c) COPYRIGHT MIT 1995.
                     14: **     Please first read the full copyright statement in the file COPYRIGH.
                     15: */
                     16: </PRE>
                     17: 
                     18: <H3>Cache Manager</H3>
                     19: 
                     20: Caching is a required part of any efficient Internet access
                     21: applications as it saves bandwidth and improves access performance
                     22: significantly in almost all types of accesses.  The Library supports
                     23: two different types of cache: The memory cache and the file cache. The
                     24: two types differ in several ways which reflects their two main
                     25: purposes: The memory cache is for short term storage of graphic
                     26: objects whereas the file cache is for intermediate term storage of
                     27: data objects. Often it is desirable to have both a memory and a file
                     28: version of a cached document, so the two types do not exclude each
                     29: other. <P>
                     30: 
                     31: The cache contains details of temporary disk files which contain the
                     32: contents of remote documents.  There is also a <A
                     33: HREF="HTAnchor.html#z1">list of cache items for each URL</A> in its
                     34: anchor object. <P>
                     35: 
                     36: There are various ways of handling Expires header when met in a
                     37: history list. Either it can be ignored all together, the user can be
                     38: notified with a warning, or the document can be reloaded
                     39: automatically. This flag decides what action to be taken. The default
                     40: action is HT_EXPIRES_IGNORE. In HT_EXPIRES_NOTIFY mode you can specify
                     41: a message to tell the user (NULL is valid in which case my own message
                     42: pops up - watch out it might be in Danish ;-)) <P>
                     43: 
                     44: The Library has two notions of a local cache: a file cache and a
                     45: memory cache. The memory cache is handled by the client and the file
                     46: cache is handled by the Library. Often the format of a object cached
                     47: in memory is in the form of a hypertext object ready to be displayed
                     48: (that is, it's already parsed).
                     49: 
                     50: <PRE>
                     51: #ifndef WWWCACHE_H
                     52: #define WWWCACHE_H
                     53: </PRE>
                     54: 
                     55: <PRE>
                     56: #ifdef __cplusplus
                     57: extern "C" { 
                     58: #endif
                     59: </PRE>
                     60: 
2.4     ! frystyk    61: <H2>System dependencies</H2>
        !            62: 
        !            63: The <A HREF="sysdep.html">sysdep.h</A> file includes system-specific include
        !            64: files and flags for I/O to network and disk. The only reason for this
        !            65: file is that the Internet world is more complicated than Posix and
        !            66: ANSI.
        !            67: 
2.1       frystyk    68: <PRE>
2.4     ! frystyk    69: #include "sysdep.h"
        !            70: </PRE>
        !            71: 
        !            72: <H2>Library Includes</H2>
        !            73: 
        !            74: <PRE>
2.1       frystyk    75: #include "HTCache.h"
                     76: </PRE>
                     77: 
                     78: End of CACHE module
                     79: 
                     80: <PRE>
                     81: #ifdef __cplusplus
                     82: } /* end extern C definitions */
                     83: #endif
                     84: 
                     85: #endif
                     86: </PRE>
                     87: 
2.3       frystyk    88: <HR>
                     89: <ADDRESS>
2.4     ! frystyk    90: @(#) $Id: WWWCache.html,v 2.3 1996/04/12 17:50:00 frystyk Exp $
2.3       frystyk    91: </ADDRESS>
2.1       frystyk    92: </BODY>
                     93: </HTML>
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