IExpiringStore.php

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<?php
interface IExpiringStore {
    // Constants for TTL values, in seconds
    const TTL_SECOND = 1;
    const TTL_MINUTE = 60;
    const TTL_HOUR = 3600;
    const TTL_DAY = 86400; // 24 * 3600
    const TTL_WEEK = 604800; // 7 * 24 * 3600
    const TTL_MONTH = 2592000; // 30 * 24 * 3600
    const TTL_YEAR = 31536000; // 365 * 24 * 3600
 
    // Shorthand process cache TTLs (useful for web requests and CLI mode)
    const TTL_PROC_SHORT = 3; // reasonably strict cache time that last the life of quick requests
    const TTL_PROC_LONG = 30; // loose cache time that can survive slow web requests
 
    const TTL_INDEFINITE = 0;
 
    // Emulation/fallback medium attribute (e.g. SQLBagOStuff)
    const ATTR_EMULATION = 1;
    // Quality of service constants for ATTR_EMULATION (higher means faster)
    const QOS_EMULATION_SQL = 1;
 
    // Replica synchronization/consistency attribute of medium when SYNC_WRITES is used
    const ATTR_SYNCWRITES = 2;
    // Quality of service constants for ATTR_SYNCWRITES (higher means more consistent)
    const QOS_SYNCWRITES_NONE = 1; // replication only supports eventual consistency or less
    const QOS_SYNCWRITES_BE = 2; // best effort synchronous with limited retries
    const QOS_SYNCWRITES_QC = 3; // write quorum applied directly to state machines where R+W > N
    const QOS_SYNCWRITES_SS = 4; // strict-serializable, nodes refuse reads if possible stale
 
    // Generic "unknown" value that is useful for comparisons (e.g. always good enough)
    const QOS_UNKNOWN = INF;
 
    const ERR_NONE = 0; // no error
    const ERR_NO_RESPONSE = 1; // no response
    const ERR_UNREACHABLE = 2; // can't connect
    const ERR_UNEXPECTED = 3; // response gave some error
}