com.goldencode.p2j.persist

Class RecordBuffer.PinnedLocks

java.lang.Object

com.goldencode.p2j.persist.RecordBuffer.PinnedLocks

Enclosing class:

RecordBuffer

private class RecordBuffer.PinnedLocks
extends java.lang.Object

This class manages the record lock types pinned by this buffer. This information is used by RecordLockContext to manage the communal locks held by the current user session.

When outside a transaction, only the lock type for the current record held by the buffer, if any, is tracked. It only can be a SHARE lock or none at all.

When inside a transaction, the most restrictive lock type for every record which passes through the buffer is tracked. Once a lock is acquired, it is not downgraded or released until the transaction ends.

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.HashMap<java.lang.Long,LockType>	inTrans The pinned lock types for all records used by this buffer in the current transaction
private long	lastXactCount Transaction count at last check, used for comparison to see if we are in a different transaction
private LockType	noTrans The pinned lock type for the current record, if any, when not in a transaction

Constructor Summary

Constructors

Modifier	Constructor and Description
private	PinnedLocks()

Method Summary

Modifier and Type	Method and Description
(package private) void	closeScope() Clean up when the buffer closes its outermost scope.
(package private) LockType	getPinnedLockType(java.lang.Long id) Get the pinned lock type for the record with the given primary key.
private boolean	manageTransactionState() Manage the internal state of this object, based on the current application transaction state.
(package private) void	setPinnedLockType(java.lang.Long id, LockType lockType) Set the pinned lock type for the record with the given primary key.

Methods inherited from class java.lang.Object

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

Field Detail

noTrans

private LockType noTrans

The pinned lock type for the current record, if any, when not in a transaction

inTrans

private java.util.HashMap<java.lang.Long,LockType> inTrans

The pinned lock types for all records used by this buffer in the current transaction

lastXactCount

private long lastXactCount

Transaction count at last check, used for comparison to see if we are in a different transaction

Constructor Detail

PinnedLocks

private PinnedLocks()

Method Detail

getPinnedLockType

LockType getPinnedLockType(java.lang.Long id)

Get the pinned lock type for the record with the given primary key.

Parameters:

id - Primary key.

Returns:

Lock type associated by this buffer with the given primary key.

setPinnedLockType

void setPinnedLockType(java.lang.Long id,
                       LockType lockType)

Set the pinned lock type for the record with the given primary key.

Parameters:

id - Primary key.

lockType - Lock type to set.

closeScope

void closeScope()

Clean up when the buffer closes its outermost scope.

manageTransactionState

private boolean manageTransactionState()

Manage the internal state of this object, based on the current application transaction state.

Returns:

true if an application transaction is active, else false.