org.apache.derby.iapi.store.raw
Class ContainerLock

java.lang.Object
  org.apache.derby.iapi.store.raw.ContainerLock

public final class ContainerLock
extends java.lang.Object

A ContainerLock represents a qualifier that is to be used when locking a container through a ContainerHandle.
MT - Immutable

See Also:

ContainerHandle, LockingPolicy

Field Summary

private static boolean[][]	C_COMPAT Container lock compatibility table.
static int	C_NUMBER Number of types of container locks.
static ContainerLock	CIS Container Intent Shared lock
static ContainerLock	CIX Container Intent Exclusive lock
private int	compat Bit mask which represents the lock types that are compatible with this lock type.
static ContainerLock	CS Container Shared lock
static ContainerLock	CU Container Update lock
static ContainerLock	CX Container Exclusive lock
private static java.lang.String[]	shortnames
private int	type Integer representation of the type of the lock.
private int	typeBit Bit mask with one bit set.

Constructor Summary

private

ContainerLock(int type)

Method Summary

int	getType() Get an integer representation of the type of the lock.
boolean	isCompatible(ContainerLock granted)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

type

private final int type

Integer representation of the type of the lock.

typeBit

private final int typeBit

Bit mask with one bit set. The position of the bit tells the type of the lock.

compat

private final int compat

Bit mask which represents the lock types that are compatible with this lock type.

C_NUMBER

public static final int C_NUMBER

Number of types of container locks.

See Also:

Constant Field Values

C_COMPAT

private static final boolean[][] C_COMPAT

Container lock compatibility table.

shortnames

private static java.lang.String[] shortnames

CIS

public static final ContainerLock CIS

Container Intent Shared lock

CIX

public static final ContainerLock CIX

Container Intent Exclusive lock

CS

public static final ContainerLock CS

Container Shared lock

CU

public static final ContainerLock CU

Container Update lock

CX

public static final ContainerLock CX

Container Exclusive lock

Constructor Detail

ContainerLock

private ContainerLock(int type)

Method Detail

getType

public int getType()

Get an integer representation of the type of the lock. This method is guaranteed to return an integer >= 0 and < C_NUMBER. No correlation between the value and one of the static variables (CIS etc.) is guaranteed, except that the values returned do not change.

isCompatible

public boolean isCompatible(ContainerLock granted)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object