Package org.apache.derby.iapi.store.raw
Class ContainerLock
- java.lang.Object
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- org.apache.derby.iapi.store.raw.ContainerLock
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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
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Field Summary
Fields Modifier and Type Field Description 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 lockstatic ContainerLock
CIX
Container Intent Exclusive lockprivate int
compat
Bit mask which represents the lock types that are compatible with this lock type.static ContainerLock
CS
Container Shared lockstatic ContainerLock
CU
Container Update lockstatic ContainerLock
CX
Container Exclusive lockprivate 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.
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Constructor Summary
Constructors Modifier Constructor Description private
ContainerLock(int type)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getType()
Get an integer representation of the type of the lock.boolean
isCompatible(ContainerLock granted)
java.lang.String
toString()
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Field Detail
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type
private final int type
Integer representation of the type of the lock.
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typeBit
private final int typeBit
Bit mask with one bit set. The position of the bit tells the type of the lock.
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compat
private final int compat
Bit mask which represents the lock types that are compatible with this lock type.
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C_NUMBER
public static final int C_NUMBER
Number of types of container locks.- See Also:
- Constant Field Values
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C_COMPAT
private static final boolean[][] C_COMPAT
Container lock compatibility table.
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shortnames
private static java.lang.String[] shortnames
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CIS
public static final ContainerLock CIS
Container Intent Shared lock
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CIX
public static final ContainerLock CIX
Container Intent Exclusive lock
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CS
public static final ContainerLock CS
Container Shared lock
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CU
public static final ContainerLock CU
Container Update lock
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CX
public static final ContainerLock CX
Container Exclusive lock
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Method Detail
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getType
public int getType()
Get an integer representation of the type of the lock. This method is guaranteed to return an integer >= 0 and &t; 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.
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isCompatible
public boolean isCompatible(ContainerLock granted)
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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