Mercurial > dovecot > core-2.2

annotate src/lib-index/mail-cache-decisions.c @ 2342:fa529dd77176 HEAD

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Fixes for big endian systems.
author Timo Sirainen <tss@iki.fi>
date Tue, 20 Jul 2004 20:52:38 +0300
parents 406692edc12d
children 604e9488a61b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Copyright (C) 2004 Timo Sirainen */
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2
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3 /*
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4 Users can be divided to three groups:
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5
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6 1. Most users will use only a single IMAP client which caches everything
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7 locally. For these users it's quite pointless to do any kind of caching
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8 as it only wastes disk space. That might also mean more disk I/O.
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9
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10 2. Some users use multiple IMAP clients which cache everything locally.
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11 These could benefit from caching until all clients have fetched the
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12 data. After that it's useless.
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13
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14 3. Some clients don't do permanent local caching at all. For example
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15 Pine and webmails. These clients would benefit from caching everything.
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16 Some locally caching clients might also access some data from server
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17 again, such as when searching messages. They could benefit from caching
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18 only these fields.
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19
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20 After thinking about these a while, I figured out that people who care
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21 about performance most will be using Dovecot optimized LDA anyway
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22 which updates the indexes/cache immediately. In that case even the first
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23 user group would benefit from caching the same way as second group. LDA
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24 reads the mail anyway, so it might as well extract some information
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25 about it and store them into cache.
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26
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27 So, group 1. and 2. could be optimally implemented by keeping things
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28 cached only for a while. I thought a week would be good. When cache file
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29 is compressed, everything older than week will be dropped.
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30
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31 But how to figure out if user is in group 3? One quite easy rule would
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32 be to see if client is accessing messages older than a week. But with
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33 only that rule we might have already dropped useful cached data. It's
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34 not very nice if we have to read and cache it twice.
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35
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36 Most locally caching clients always fetch new messages (all but body)
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37 when they see them. They fetch them in ascending order. Noncaching
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38 clients might fetch messages in pretty much any order, as they usually
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39 don't fetch everything they can, only what's visible in screen. Some
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40 will use server side sorting/threading which also makes messages to be
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41 fetched in random order. Second rule would then be that if a session
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42 doesn't fetch messages in ascending order, the fetched field type will
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43 be permanently cached.
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44
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45 So, we have three caching decisions:
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46
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47 1. Don't cache: Clients have never wanted the field
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48 2. Cache temporarily: Clients want this only once
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49 3. Cache permanently: Clients want this more than once
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50
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51 Different mailboxes have different decisions. Different fields have
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52 different decisions.
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53
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54 There are some problems, such as if a client accesses message older than
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55 a week, we can't know if user just started using a new client which is
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56 just filling it's local cache for the first time. Or it might be a
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57 client user hasn't just used for over a week. In these cases we
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58 shouldn't have marked the field to be permanently cached. User might
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59 also switch clients from non-caching to caching.
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60
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61 So we should re-evaluate our caching decisions from time to time. This
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62 is done by checking the above rules constantly and marking when was the
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63 last time the decision was right. If decision hasn't matched for two
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64 months, it's changed. I picked two months because people go to at least
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65 one month vacations where they might still be reading mails, but with
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66 different clients.
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67 */
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68
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69 #include "lib.h"
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70 #include "ioloop.h"
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71 #include "mail-cache-private.h"
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72
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73 void mail_cache_decision_lookup(struct mail_cache_view *view, uint32_t seq,
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74 unsigned int field)
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75 {
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76 struct mail_cache *cache = view->cache;
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77 const struct mail_index_header *hdr;
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78 uint32_t uid;
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79
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80 i_assert(field < cache->fields_count);
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81
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82 if (cache->fields[field].field.decision != MAIL_CACHE_DECISION_TEMP) {
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83 /* a) forced decision
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84 b) not cached, mail_cache_decision_add() will handle this
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85 c) permanently cached already, okay. */
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86 return;
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87 }
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88
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89 /* see if we want to change decision from TEMP to YES */
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90 if (mail_index_lookup_uid(view->view, seq, &uid) < 0 ||
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91 mail_index_get_header(view->view, &hdr) < 0)
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92 return;
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93
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94 if (ioloop_time - cache->fields[field].last_used > 3600*24) {
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95 /* update last_used about once a day */
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96 cache->fields[field].last_used = (uint32_t)ioloop_time;
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97 cache->field_header_write_pending = TRUE;
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98 }
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99
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100 if (uid < cache->fields[field].uid_highwater ||
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101 uid < hdr->day_first_uid[7]) {
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102 /* a) nonordered access within this session. if client doesn't
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103 request messages in growing order, we assume it doesn't
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104 have a permanent local cache.
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105 b) accessing message older than one week. assume it's a
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106 client with no local cache. if it was just a new client
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107 generating the local cache for the first time, we'll
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108 drop back to TEMP within few months. */
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109 cache->fields[field].field.decision = MAIL_CACHE_DECISION_YES;
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110 cache->field_header_write_pending = TRUE;
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111 } else {
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112 cache->fields[field].uid_highwater = uid;
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113 }
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114 }
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115
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116 void mail_cache_decision_add(struct mail_cache_view *view, uint32_t seq,
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117 unsigned int field)
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118 {
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119 struct mail_cache *cache = view->cache;
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120 uint32_t uid;
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121
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122 i_assert(field < cache->fields_count);
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123
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124 if (MAIL_CACHE_IS_UNUSABLE(cache))
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125 return;
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126
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127 if (cache->fields[field].field.decision != MAIL_CACHE_DECISION_NO) {
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128 /* a) forced decision
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129 b) we're already caching it, so it just wasn't in cache */
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130 return;
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131 }
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132
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133 /* field used the first time */
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134 cache->fields[field].field.decision = MAIL_CACHE_DECISION_TEMP;
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135 cache->field_header_write_pending = TRUE;
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136
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137 if (mail_index_lookup_uid(view->view, seq, &uid) == 0)
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138 cache->fields[field].uid_highwater = uid;
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2d51bb58a070 Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
139 }