1 /*  $Id: tape.h 6647 2004-01-25 20:06:42Z rra $
2 **
3 **  The public interface to the Tape class.
4 **
5 **  Written by James Brister <brister@vix.com>
6 **
7 **  The Tape class simulates a mag tape.  It only reads or writes Articles.  A
8 **  tape is either in an Input or Output state.  When an Article is given to a
9 **  Tape it will store the Article in memory until it reaches a highwater mark
10 **  at which point it dumps all it's articles to disk.
11 **
12 **  Input tapes generate article objects on request if the underlying tape
13 **  file has info in it.  The Tapes take care of cleaning up used-up files as
14 **  needed.
15 */
16 
17 #if ! defined ( tape_h__ )
18 #define tape_h__
19 
20 #include <stdio.h>
21 
22 #include "misc.h"
23 
24 
25 /* If dontRotate is true, then any articles that get written to the tape
26    will never be read back in again. This is for the batch-mode-only case
27    where articles written to tape were done so 'cause the remote
28    temporarily rejected them. */
29 Tape newTape (const char *peerName, bool dontRotate) ;
30 
31 void gPrintTapeInfo (FILE *fp, unsigned int inedntAmt) ;
32 void printTapeInfo (Tape tape, FILE *fp, unsigned int indentAmt) ;
33 
34 /* deletes the tape objects. If it has any articles cached then it dumps
35    them to the disk. */
36 void delTape (Tape tape) ;
37 
38 /* give an article to the Tape for storage */
39 void tapeTakeArticle (Tape tape, Article article) ;
40 
41 /* get a new article from an Input tape. */
42 Article getArticle (Tape tape) ;
43 
44 /* close the input and output files and reopen them. */
45 void gFlushTapes (void) ;
46 void tapeFlush (Tape tape) ;
47 
48 
49 /**************************************************/
50 /*               CLASS LEVEL FUNCTIONS            */
51 /**************************************************/
52 
53 /* get all the active input tapes to checkpoint their current positions */
54 void checkPointTapes (void) ;
55 
56 /* get the name of the directory tapes are being stored in. */
57 const char *getTapeDirectory (void) ;
58 
59 /* set the size limit of the output tapes. Default is zero which is no
60    limit. */
61 void setOutputSizeLimit (long limit) ;
62 
63 int tapeConfigLoadCbk (void *data) ;
64 
65 void tapeLogGlobalStatus (FILE *fp) ;
66 void tapeLogStatus (Tape tape, FILE *fp) ;
67 
68 #endif /* tape_h__ */
69