kim.sesame.framework.locks

类 DefaultLockRegistry

java.lang.Object

kim.sesame.framework.locks.DefaultLockRegistry

所有已实现的接口:

LockRegistry

public final class DefaultLockRegistry
extends Object
implements LockRegistry

Default implementation of LockRegistry which uses Masked Hashcode algorithm to obtain locks. When an instance of this class is created and array of Lock objects is created. The length of the array is based on the 'mask' parameter passed in the constructor. The default mask is 0xFF which will create and array consisting of 256 ReentrantLock instances. When the obtain(Object) method is called with the lockKey (e.g., Object) the index of the Lock is determined by masking the object's hashCode (e.g., object.hashCode & mask) and the Lock is returned.

从以下版本开始:

2.1.1

作者:

Oleg Zhurakousky, Gary Russell

构造器概要

构造器

构造器和说明
DefaultLockRegistry() Constructs a DefaultLockRegistry with the default mask 0xFF with 256 locks.
DefaultLockRegistry(int mask) Constructs a DefaultLockRegistry with the supplied mask - the mask must have a value Math.pow(2, n) - 1 where n is 1 to 31, creating a hash of Math.pow(2, n) locks.

方法概要

限定符和类型	方法和说明
Lock	obtain(Object lockKey) Obtains a lock by masking the lockKey's hashCode() with the mask and using the result as an index to the lock table.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

DefaultLockRegistry

public DefaultLockRegistry()

Constructs a DefaultLockRegistry with the default mask 0xFF with 256 locks.

DefaultLockRegistry

public DefaultLockRegistry(int mask)

Constructs a DefaultLockRegistry with the supplied mask - the mask must have a value Math.pow(2, n) - 1 where n is 1 to 31, creating a hash of Math.pow(2, n) locks.

Examples:

• 0x3ff (1023) - 1024 locks
• 0xfff (4095) - 4096 locks

参数:

mask - The bit mask.

方法详细资料

obtain

public Lock obtain(Object lockKey)

Obtains a lock by masking the lockKey's hashCode() with the mask and using the result as an index to the lock table.

指定者:

obtain 在接口中 LockRegistry

参数:

lockKey - the object used to derive the lock index.

返回:

The associated lock.