Search/Lucene/LockManager.php
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This source file is subject to the new BSD license that is bundled
with this package in the file LICENSE.txt.
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http://framework.zend.com/license/new-bsd
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- Category
- Zend
- Copyright
- Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
- License
- New BSD License
- Package
- Zend_Search_Lucene
- Version
- $Id$
\Zend_Search_Lucene_LockManager
Package: Zend_Search_Lucene
Returns
Throws
Returns
Returns
Throws
This is an utility class which provides index locks processing functionality
- Category
- Zend
- Copyright
- Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
- License
- New BSD License
Constants
WRITE_LOCK_FILE
= 'write.lock.file'consts for name of file to show lock status
READ_LOCK_FILE
= 'read.lock.file'
READ_LOCK_PROCESSING_LOCK_FILE
= 'read-lock-processing.lock.file'
OPTIMIZATION_LOCK_FILE
= 'optimization.lock.file'Methods
_startReadLockProcessing(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : \Zend_Search_Lucene_Storage_Filestatic
Obtain the exclusive "read escalation/de-escalation" lock
Required to protect the escalate/de-escalate read lock process
on GFS (and potentially other) mounted filesystems.
Why we need this:
While GFS supports cluster-wide locking via flock(), it's
implementation isn't quite what it should be. The locking
semantics that work consistently on a local filesystem tend to
fail on GFS mounted filesystems. This appears to be a design defect
in the implementation of GFS. How this manifests itself is that
conditional promotion of a shared lock to exclusive will always
fail, lock release requests are honored but not immediately
processed (causing erratic failures of subsequent conditional
requests) and the releasing of the exclusive lock before the
shared lock is set when a lock is demoted (which can open a window
of opportunity for another process to gain an exclusive lock when
it shoudln't be allowed to).
Parameters| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
| Type | Description |
|---|---|
| \Zend_Search_Lucene_Storage_File |
| Exception | Description |
|---|---|
| \Zend_Search_Lucene_Exception |
_stopReadLockProcessing(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : voidstatic
Release the exclusive "read escalation/de-escalation" lock
Required to protect the escalate/de-escalate read lock process
on GFS (and potentially other) mounted filesystems.
Parameters| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
deEscalateReadLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : voidstatic
De-escalate Read lock to shared level
Parameters
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
escalateReadLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : booleanstatic
Escalate Read lock to exclusive level
Parameters
Returns
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
| Type | Description |
|---|---|
| boolean |
obtainOptimizationLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : mixedstatic
Obtain exclusive optimization lock on the index
Returns lock object on success and false otherwise (doesn't block execution)
Parameters| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
| Type | Description |
|---|---|
| mixed |
obtainReadLock( $lockDirectory) : \Zend_Search_Lucene_Storage_Filestatic
Obtain shared read lock on the index
It doesn't block other read or update processes, but prevent index from the premature cleaning-up
Parameters| Name | Type | Description |
|---|---|---|
| $lockDirectory |
| Type | Description |
|---|---|
| \Zend_Search_Lucene_Storage_File |
| Exception | Description |
|---|---|
| \Zend_Search_Lucene_Exception |
obtainWriteLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : \Zend_Search_Lucene_Storage_Filestatic
Obtain exclusive write lock on the index
Parameters
Returns
Throws
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
| Type | Description |
|---|---|
| \Zend_Search_Lucene_Storage_File |
| Exception | Description |
|---|---|
| \Zend_Search_Lucene_Exception |
releaseOptimizationLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : voidstatic
Release exclusive optimization lock
Parameters
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
releaseReadLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : voidstatic
Release shared read lock
Parameters
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |
releaseWriteLock(\Zend_Search_Lucene_Storage_Directory $lockDirectory) : voidstatic
Release exclusive write lock
Parameters
| Name | Type | Description |
|---|---|---|
| $lockDirectory | \Zend_Search_Lucene_Storage_Directory |