Java Doc for ReadWriteLock.java in  » Database-JDBC-Connection-Pool » Apache-commons-transaction-1.2 » org » apache » commons » transaction » locking » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Database JDBC Connection Pool » Apache commons transaction 1.2 » org.apache.commons.transaction.locking 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.commons.transaction.locking.GenericLock
      org.apache.commons.transaction.locking.ReadWriteLock

ReadWriteLock
public class ReadWriteLock extends GenericLock (Code)
Convenience implementation of a read/write lock based on GenericLock .

Reads are shared which means there can be any number of concurrent read accesses allowed by this lock. Writes are exclusive. This means when there is a write access no other access neither read nor write are allowed by this lock. Additionally, writes are preferred over reads in order to avoid starvation. The idea is that there are many readers, but few writers and if things work out bad the writer would never be served at all. That's why it is preferred.

Calls to both ReadWriteLock.acquireRead(Object,long) and ReadWriteLock.acquireWrite(Object,long) are blocking and reentrant. Blocking means they will wait if they can not acquire the descired access, reentrant means that a lock request by a specific owner will always be compatible with other accesses on this lock by the same owner. E.g. if you already have a lock for writing and you try to acquire write access again you will not be blocked by this first lock, while others of course will be. This is the natural way you already know from Java monitors and synchronized blocks.
version:
   $Id: ReadWriteLock.java 493628 2007-01-07 01:42:48Z joerg $
See Also:   GenericLock


Field Summary
final public static  intNO_LOCK
    
final public static  intREAD_LOCK
    
final public static  intWRITE_LOCK
    

Constructor Summary
public  ReadWriteLock(Object resourceId, LoggerFacade logger)
     Creates a new read/write lock.

Method Summary
public  booleanacquireRead(Object ownerId, long timeoutMSecs)
     Tries to acquire a blocking, reentrant read lock.
public  booleanacquireWrite(Object ownerId, long timeoutMSecs)
     Tries to acquire a blocking, reentrant write lock.

Field Detail
NO_LOCK
final public static int NO_LOCK(Code)



READ_LOCK
final public static int READ_LOCK(Code)



WRITE_LOCK
final public static int WRITE_LOCK(Code)




Constructor Detail
ReadWriteLock
public ReadWriteLock(Object resourceId, LoggerFacade logger)(Code)
Creates a new read/write lock.
Parameters:
  resourceId - identifier for the resource associated to this lock
Parameters:
  logger - generic logger used for all kind of debug logging




Method Detail
acquireRead
public boolean acquireRead(Object ownerId, long timeoutMSecs) throws InterruptedException(Code)
Tries to acquire a blocking, reentrant read lock. A read lock is compatible with other read locks, but not with a write lock.
Parameters:
  ownerId - a unique id identifying the entity that wants to acquire acertain lock level on this lock
Parameters:
  timeoutMSecs - if blocking is enabled by the wait parameterthis specifies the maximum wait time in milliseconds true if the lock actually was acquired
throws:
  InterruptedException - when the thread waiting on this method is interrupted



acquireWrite
public boolean acquireWrite(Object ownerId, long timeoutMSecs) throws InterruptedException(Code)
Tries to acquire a blocking, reentrant write lock. A write lock is incompatible with any another read or write lock and is thus exclusive.
Parameters:
  ownerId - a unique id identifying the entity that wants to acquire acertain lock level on this lock
Parameters:
  timeoutMSecs - if blocking is enabled by the wait parameterthis specifies the maximum wait time in milliseconds true if the lock actually was acquired
throws:
  InterruptedException - when the thread waiting on this method is interrupted



Fields inherited from org.apache.commons.transaction.locking.GenericLock
protected LoggerFacade logger(Code)(Java Doc)
protected Map owners(Code)(Java Doc)
protected Object resourceId(Code)(Java Doc)
protected int waiters(Code)(Java Doc)
protected List waitingOwners(Code)(Java Doc)

Methods inherited from org.apache.commons.transaction.locking.GenericLock
public synchronized boolean acquire(Object ownerId, int targetLockLevel, boolean wait, boolean reentrant, long timeoutMSecs) throws InterruptedException(Code)(Java Doc)
public synchronized boolean acquire(Object ownerId, int targetLockLevel, boolean wait, int compatibility, long timeoutMSecs) throws InterruptedException(Code)(Java Doc)
public synchronized boolean acquire(Object ownerId, int targetLockLevel, boolean preferred, long timeoutMSecs) throws InterruptedException(Code)(Java Doc)
public synchronized boolean acquire(Object ownerId, int targetLockLevel, boolean wait, int compatibility, boolean preferred, long timeoutMSecs) throws InterruptedException(Code)(Java Doc)
public boolean equals(Object o)(Code)(Java Doc)
protected Set getConflictingOwners(Object ownerId, int targetLockLevel, int compatibility)(Code)(Java Doc)
protected Set getConflictingOwners(LockOwner myOwner, Collection ownersToTest)(Code)(Java Doc)
protected Collection getConflictingWaiters(Object ownerId)(Code)(Java Doc)
public int getLevelMaxLock()(Code)(Java Doc)
public int getLevelMinLock()(Code)(Java Doc)
public int getLockLevel(Object ownerId)(Code)(Java Doc)
protected synchronized LockOwner getMaxLevelOwner()(Code)(Java Doc)
protected synchronized LockOwner getMaxLevelOwner(LockOwner reentrantOwner, boolean preferred)(Code)(Java Doc)
protected synchronized LockOwner getMaxLevelOwner(int supportLockLevel, boolean preferred)(Code)(Java Doc)
protected synchronized LockOwner getMaxLevelOwner(LockOwner reentrantOwner, int supportLockLevel, boolean preferred)(Code)(Java Doc)
public Object getOwner()(Code)(Java Doc)
public Object getResourceId()(Code)(Java Doc)
public boolean has(Object ownerId, int lockLevel)(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
protected boolean isCompatible(int targetLockLevel, int currentLockLevel)(Code)(Java Doc)
protected void registerWaiter(LockOwner waitingOwner)(Code)(Java Doc)
public synchronized boolean release(Object ownerId)(Code)(Java Doc)
protected synchronized void setLockLevel(Object ownerId, LockOwner lock, int targetLockLevel, int compatibility, boolean intention)(Code)(Java Doc)
public boolean test(Object ownerId, int targetLockLevel, int compatibility)(Code)(Java Doc)
public synchronized String toString()(Code)(Java Doc)
protected boolean tryLock(Object ownerId, int targetLockLevel, int compatibility, boolean preferred)(Code)(Java Doc)
protected synchronized boolean tryLock(Object ownerId, int targetLockLevel, int compatibility, boolean preferred, boolean tryOnly)(Code)(Java Doc)
protected void unregisterWaiter(LockOwner waitingOwner)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.