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StorageAwareness.php
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1 <?php
24 namespace Wikimedia\LightweightObjectStore;
25 
32 interface StorageAwareness {
34  public const ERR_NONE = 0;
36  public const ERR_NO_RESPONSE = 1;
38  public const ERR_UNREACHABLE = 2;
40  public const ERR_UNEXPECTED = 3;
41 
43  public const ATTR_EMULATION = 1;
45  public const ATTR_DURABILITY = 2;
46 
48  public const QOS_EMULATION_SQL = 1;
49 
51  public const QOS_DURABILITY_NONE = 1;
53  public const QOS_DURABILITY_SCRIPT = 2;
55  public const QOS_DURABILITY_SERVICE = 3;
57  public const QOS_DURABILITY_DISK = 4;
59  public const QOS_DURABILITY_RDBMS = 5;
60 
62  public const QOS_UNKNOWN = INF;
63 }
Wikimedia\LightweightObjectStore\StorageAwareness
Generic interface providing error code and quality-of-service constants for object stores.
Definition: StorageAwareness.php:32
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_SERVICE
const QOS_DURABILITY_SERVICE
Data is lost once the service storing the data restarts.
Definition: StorageAwareness.php:55
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_SCRIPT
const QOS_DURABILITY_SCRIPT
Data is lost at the end of the current web request or CLI script.
Definition: StorageAwareness.php:53
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_NONE
const QOS_DURABILITY_NONE
Data is never saved to begin with (blackhole store)
Definition: StorageAwareness.php:51
Wikimedia\LightweightObjectStore\StorageAwareness\ERR_UNREACHABLE
const ERR_UNREACHABLE
Storage medium could not be reached to establish a connection.
Definition: StorageAwareness.php:38
Wikimedia\LightweightObjectStore\StorageAwareness\ATTR_EMULATION
const ATTR_EMULATION
Emulation/fallback mode; see QOS_EMULATION_*; higher is better.
Definition: StorageAwareness.php:43
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_RDBMS
const QOS_DURABILITY_RDBMS
Data is saved to disk and writes usually block on fsync(), like a standard RDBMS.
Definition: StorageAwareness.php:59
Wikimedia\LightweightObjectStore\StorageAwareness\ATTR_DURABILITY
const ATTR_DURABILITY
Durability of writes; see QOS_DURABILITY_* (higher means stronger)
Definition: StorageAwareness.php:45
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_EMULATION_SQL
const QOS_EMULATION_SQL
Fallback disk-based SQL store.
Definition: StorageAwareness.php:48
Wikimedia\LightweightObjectStore\StorageAwareness\ERR_UNEXPECTED
const ERR_UNEXPECTED
Storage medium operation failed due to usage limitations or an I/O error.
Definition: StorageAwareness.php:40
Wikimedia\LightweightObjectStore\StorageAwareness\ERR_NO_RESPONSE
const ERR_NO_RESPONSE
Storage medium failed to yield a complete response to an operation.
Definition: StorageAwareness.php:36
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_UNKNOWN
const QOS_UNKNOWN
Generic "unknown" value; useful for comparisons (always "good enough")
Definition: StorageAwareness.php:62
Wikimedia\LightweightObjectStore\StorageAwareness\QOS_DURABILITY_DISK
const QOS_DURABILITY_DISK
Data is saved to disk and writes do not usually block on fsync()
Definition: StorageAwareness.php:57