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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 }
const QOS_SYNCWRITES_NONE