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IExpiringStore.php
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1 <?php
30 interface IExpiringStore {
31  // Constants for TTL values, in seconds
32  const TTL_SECOND = 1;
33  const TTL_MINUTE = 60;
34  const TTL_HOUR = 3600;
35  const TTL_DAY = 86400; // 24 * 3600
36  const TTL_WEEK = 604800; // 7 * 24 * 3600
37  const TTL_MONTH = 2592000; // 30 * 24 * 3600
38  const TTL_YEAR = 31536000; // 365 * 24 * 3600
39 
40  // Shorthand process cache TTLs (useful for web requests and CLI mode)
41  const TTL_PROC_SHORT = 3; // reasonably strict cache time that last the life of quick requests
42  const TTL_PROC_LONG = 30; // loose cache time that can survive slow web requests
43 
44  const TTL_INDEFINITE = 0;
45 
46  // Emulation/fallback medium attribute (e.g. SQLBagOStuff)
47  const ATTR_EMULATION = 1;
48  // Quality of service constants for ATTR_EMULATION (higher means faster)
49  const QOS_EMULATION_SQL = 1;
50 
51  // Replica synchronization/consistency attribute of medium when SYNC_WRITES is used
52  const ATTR_SYNCWRITES = 2;
53  // Quality of service constants for ATTR_SYNCWRITES (higher means more consistent)
54  const QOS_SYNCWRITES_NONE = 1; // replication only supports eventual consistency or less
55  const QOS_SYNCWRITES_BE = 2; // best effort synchronous with limited retries
56  const QOS_SYNCWRITES_QC = 3; // write quorum applied directly to state machines where R+W > N
57  const QOS_SYNCWRITES_SS = 4; // strict-serializable, nodes refuse reads if possible stale
58 
59  // Generic "unknown" value that is useful for comparisons (e.g. always good enough)
60  const QOS_UNKNOWN = INF;
61 
62  const ERR_NONE = 0; // no error
63  const ERR_NO_RESPONSE = 1; // no response
64  const ERR_UNREACHABLE = 2; // can't connect
65  const ERR_UNEXPECTED = 3; // response gave some error
66 }
IExpiringStore\QOS_SYNCWRITES_SS
const QOS_SYNCWRITES_SS
Definition: IExpiringStore.php:57
IExpiringStore\ERR_UNEXPECTED
const ERR_UNEXPECTED
Definition: IExpiringStore.php:65
IExpiringStore\ERR_NONE
const ERR_NONE
Definition: IExpiringStore.php:62
IExpiringStore\QOS_EMULATION_SQL
const QOS_EMULATION_SQL
Definition: IExpiringStore.php:49
IExpiringStore\TTL_SECOND
const TTL_SECOND
Definition: IExpiringStore.php:32
IExpiringStore\ERR_UNREACHABLE
const ERR_UNREACHABLE
Definition: IExpiringStore.php:64
IExpiringStore\TTL_MINUTE
const TTL_MINUTE
Definition: IExpiringStore.php:33
IExpiringStore\QOS_SYNCWRITES_QC
const QOS_SYNCWRITES_QC
Definition: IExpiringStore.php:56
IExpiringStore\ATTR_EMULATION
const ATTR_EMULATION
Definition: IExpiringStore.php:47
IExpiringStore
Generic interface for lightweight expiring object stores.
Definition: IExpiringStore.php:30
IExpiringStore\TTL_DAY
const TTL_DAY
Definition: IExpiringStore.php:35
IExpiringStore\TTL_INDEFINITE
const TTL_INDEFINITE
Definition: IExpiringStore.php:44
IExpiringStore\QOS_SYNCWRITES_BE
const QOS_SYNCWRITES_BE
Definition: IExpiringStore.php:55
IExpiringStore\TTL_MONTH
const TTL_MONTH
Definition: IExpiringStore.php:37
IExpiringStore\QOS_UNKNOWN
const QOS_UNKNOWN
Definition: IExpiringStore.php:60
IExpiringStore\TTL_PROC_SHORT
const TTL_PROC_SHORT
Definition: IExpiringStore.php:41
IExpiringStore\ATTR_SYNCWRITES
const ATTR_SYNCWRITES
Definition: IExpiringStore.php:52
IExpiringStore\TTL_WEEK
const TTL_WEEK
Definition: IExpiringStore.php:36
IExpiringStore\TTL_HOUR
const TTL_HOUR
Definition: IExpiringStore.php:34
IExpiringStore\TTL_YEAR
const TTL_YEAR
Definition: IExpiringStore.php:38
IExpiringStore\QOS_SYNCWRITES_NONE
const QOS_SYNCWRITES_NONE
Definition: IExpiringStore.php:54
IExpiringStore\ERR_NO_RESPONSE
const ERR_NO_RESPONSE
Definition: IExpiringStore.php:63
IExpiringStore\TTL_PROC_LONG
const TTL_PROC_LONG
Definition: IExpiringStore.php:42