org.hibernate

Class LockOptions

java.lang.Object

org.hibernate.LockOptions

All Implemented Interfaces:

Serializable

public class LockOptions
extends Object
implements Serializable

Contains locking details (LockMode, Timeout and Scope).

Author:

Scott Marlow

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	NO_WAIT Indicates that the database should not wait at all to acquire the pessimistic lock.
static LockOptions	NONE Represents LockMode.NONE (timeout + scope do not apply).
static LockOptions	READ Represents LockMode.READ (timeout + scope do not apply).
static int	SKIP_LOCKED Indicates that rows that are already locked should be skipped.
static LockOptions	UPGRADE Represents LockMode.UPGRADE (will wait forever for lock and scope of false meaning only entity is locked).
static int	WAIT_FOREVER Indicates that there is no timeout for the acquisition.

Constructor Summary

Constructors

Constructor and Description
LockOptions() Constructs a LockOptions with all default options.
LockOptions(LockMode lockMode) Constructs a LockOptions with the given lock mode.

Method Summary

Modifier and Type	Method and Description
static LockOptions	copy(LockOptions source, LockOptions destination) Perform a shallow copy.
LockMode	findGreatestLockMode() Currently needed for follow-on locking.
int	getAliasLockCount() Get the number of aliases that have specific lock modes defined.
Iterator	getAliasLockIterator() Iterator for accessing Alias (key) and LockMode (value) as Map.Entry.
LockMode	getAliasSpecificLockMode(String alias) Get the LockMode explicitly specified for the given alias via setAliasSpecificLockMode(java.lang.String, org.hibernate.LockMode) Differs from getEffectiveLockMode(java.lang.String) in that here we only return explicitly specified alias-specific lock modes.
LockMode	getEffectiveLockMode(String alias) Determine the LockMode to apply to the given alias.
LockMode	getLockMode() Retrieve the overall lock mode in effect for this set of options.
boolean	getScope() Retrieve the current lock scope setting.
int	getTimeOut() Retrieve the current timeout setting.
boolean	hasAliasSpecificLockModes() Does this LockOptions object define alias-specific lock modes?
LockOptions	makeCopy() Make a copy.
LockOptions	setAliasSpecificLockMode(String alias, LockMode lockMode) Specify the LockMode to be used for a specific query alias.
LockOptions	setLockMode(LockMode lockMode) Set the overall LockMode to be used.
LockOptions	setScope(boolean scope) Set the scope.
LockOptions	setTimeOut(int timeout) Set the timeout setting.

Methods inherited from class java.lang.Object

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

Field Detail

NONE

public static final LockOptions NONE

Represents LockMode.NONE (timeout + scope do not apply).

READ

public static final LockOptions READ

Represents LockMode.READ (timeout + scope do not apply).

UPGRADE

public static final LockOptions UPGRADE

Represents LockMode.UPGRADE (will wait forever for lock and scope of false meaning only entity is locked).

NO_WAIT

public static final int NO_WAIT

Indicates that the database should not wait at all to acquire the pessimistic lock.

See Also:

getTimeOut(), Constant Field Values

WAIT_FOREVER

public static final int WAIT_FOREVER

Indicates that there is no timeout for the acquisition.

See Also:

getTimeOut(), Constant Field Values

SKIP_LOCKED

public static final int SKIP_LOCKED

Indicates that rows that are already locked should be skipped.

See Also:

getTimeOut(), Constant Field Values

Constructor Detail

LockOptions

public LockOptions()

Constructs a LockOptions with all default options.

LockOptions

public LockOptions(LockMode lockMode)

Constructs a LockOptions with the given lock mode.

Parameters:

lockMode - The lock mode to use

Method Detail

getLockMode

public LockMode getLockMode()

Retrieve the overall lock mode in effect for this set of options.

In certain contexts (hql and criteria), lock-modes can be defined in an even more granular per-alias fashion

Returns:

The overall lock mode.

setLockMode

public LockOptions setLockMode(LockMode lockMode)

Set the overall LockMode to be used. The default is LockMode.NONE

Parameters:

lockMode - The new overall lock mode to use.

Returns:

this (for method chaining).

setAliasSpecificLockMode

public LockOptions setAliasSpecificLockMode(String alias,
                                            LockMode lockMode)

Specify the LockMode to be used for a specific query alias.

Parameters:

alias - used to reference the LockMode.

lockMode - The lock mode to apply to the given alias

Returns:

this LockRequest instance for operation chaining.

See Also:

Query.setLockMode(String, LockMode), Criteria.setLockMode(LockMode), Criteria.setLockMode(String, LockMode)

getAliasSpecificLockMode

public LockMode getAliasSpecificLockMode(String alias)

Get the LockMode explicitly specified for the given alias via setAliasSpecificLockMode(java.lang.String, org.hibernate.LockMode)

Differs from getEffectiveLockMode(java.lang.String) in that here we only return explicitly specified alias-specific lock modes.

Parameters:

alias - The alias for which to locate the explicit lock mode.

Returns:

The explicit lock mode for that alias.

getEffectiveLockMode

public LockMode getEffectiveLockMode(String alias)

Determine the LockMode to apply to the given alias. If no mode was explicitly set, the overall mode is returned. If the overall lock mode is null as well, LockMode.NONE is returned.

Differs from getAliasSpecificLockMode(java.lang.String) in that here we fallback to we only return the overall lock mode.

Parameters:

alias - The alias for which to locate the effective lock mode.

Returns:

The effective lock mode.

hasAliasSpecificLockModes

public boolean hasAliasSpecificLockModes()

Does this LockOptions object define alias-specific lock modes?

Returns:

true if this LockOptions object define alias-specific lock modes; false otherwise.

getAliasLockCount

public int getAliasLockCount()

Get the number of aliases that have specific lock modes defined.

Returns:

the number of explicitly defined alias lock modes.

getAliasLockIterator

public Iterator getAliasLockIterator()

Iterator for accessing Alias (key) and LockMode (value) as Map.Entry.

Returns:

Iterator for accessing the Map.Entry's

findGreatestLockMode

public LockMode findGreatestLockMode()

Currently needed for follow-on locking.

Returns:

The greatest of all requested lock modes.

getTimeOut

public int getTimeOut()

Retrieve the current timeout setting.

The timeout is the amount of time, in milliseconds, we should instruct the database to wait for any requested pessimistic lock acquisition.

NO_WAIT, WAIT_FOREVER or SKIP_LOCKED represent 3 "magic" values.

Returns:

timeout in milliseconds, NO_WAIT, WAIT_FOREVER or SKIP_LOCKED

setTimeOut

public LockOptions setTimeOut(int timeout)

Set the timeout setting.

See getTimeOut() for a discussion of meaning.

Parameters:

timeout - The new timeout setting.

Returns:

this (for method chaining).

See Also:

getTimeOut()

getScope

public boolean getScope()

Retrieve the current lock scope setting.

"scope" is a JPA defined term. It is basically a cascading of the lock to associations.

Returns:

true if locking will be extended to owned associations

setScope

public LockOptions setScope(boolean scope)

Set the scope.

Parameters:

scope - The new scope setting

Returns:

this (for method chaining).

makeCopy

public LockOptions makeCopy()

Make a copy.

Returns:

The copy

copy

public static LockOptions copy(LockOptions source,
                               LockOptions destination)

Perform a shallow copy.

Parameters:

source - Source for the copy (copied from)

destination - Destination for the copy (copied to)

Returns:

destination