Package com.google.spanner.v1

Enum TransactionOptions.ReadWrite.ReadLockMode

java.lang.Object

java.lang.Enum<TransactionOptions.ReadWrite.ReadLockMode>

com.google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode

All Implemented Interfaces:

com.google.protobuf.Internal.EnumLite, com.google.protobuf.ProtocolMessageEnum, Serializable, Comparable<TransactionOptions.ReadWrite.ReadLockMode>

Enclosing class:

TransactionOptions.ReadWrite

public static enum TransactionOptions.ReadWrite.ReadLockMode
extends Enum<TransactionOptions.ReadWrite.ReadLockMode>
implements com.google.protobuf.ProtocolMessageEnum

 `ReadLockMode` is used to set the read lock mode for read-write
 transactions.
 

Protobuf enum google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode

Enum Constant Summary

Enum Constants

Enum Constant	Description
OPTIMISTIC	Optimistic lock mode.
PESSIMISTIC	Pessimistic lock mode.
READ_LOCK_MODE_UNSPECIFIED	Default value
UNRECOGNIZED

Field Summary

Fields

Modifier and Type	Field	Description
static final int	OPTIMISTIC_VALUE	Optimistic lock mode.
static final int	PESSIMISTIC_VALUE	Pessimistic lock mode.
static final int	READ_LOCK_MODE_UNSPECIFIED_VALUE	Default value

Method Summary

Modifier and Type	Method	Description
static TransactionOptions.ReadWrite.ReadLockMode	forNumber(int value)
static com.google.protobuf.Descriptors.EnumDescriptor	getDescriptor()
final com.google.protobuf.Descriptors.EnumDescriptor	getDescriptorForType()
final int	getNumber()
final com.google.protobuf.Descriptors.EnumValueDescriptor	getValueDescriptor()
static com.google.protobuf.Internal.EnumLiteMap<TransactionOptions.ReadWrite.ReadLockMode>	internalGetValueMap()
static TransactionOptions.ReadWrite.ReadLockMode	valueOf(int value)	Deprecated.
static TransactionOptions.ReadWrite.ReadLockMode	valueOf(com.google.protobuf.Descriptors.EnumValueDescriptor desc)	Returns the enum constant of this type with the specified name.
static TransactionOptions.ReadWrite.ReadLockMode	valueOf(String name)	Returns the enum constant of this type with the specified name.
static TransactionOptions.ReadWrite.ReadLockMode[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

READ_LOCK_MODE_UNSPECIFIED

public static final TransactionOptions.ReadWrite.ReadLockMode READ_LOCK_MODE_UNSPECIFIED

 Default value.

 * If isolation level is
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE],
 locking semantics default to `PESSIMISTIC`.
 * If isolation level is
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ],
 locking semantics default to `OPTIMISTIC`.
 * See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control)
 for more details.
 

READ_LOCK_MODE_UNSPECIFIED = 0;

PESSIMISTIC

public static final TransactionOptions.ReadWrite.ReadLockMode PESSIMISTIC

 Pessimistic lock mode.

 Lock acquisition behavior depends on the isolation level in use. In
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE]
 isolation, reads and writes acquire necessary locks during transaction
 statement execution. In
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ]
 isolation, reads that explicitly request to be locked and writes
 acquire locks.
 See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control) for
 details on the types of locks acquired at each transaction step.
 

PESSIMISTIC = 1;

OPTIMISTIC

public static final TransactionOptions.ReadWrite.ReadLockMode OPTIMISTIC

 Optimistic lock mode.

 Lock acquisition behavior depends on the isolation level in use. In
 both
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE]
 and
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ]
 isolation, reads and writes do not acquire locks during transaction
 statement execution.
 See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control) for
 details on how the guarantees of each isolation level are provided at
 commit time.
 

OPTIMISTIC = 2;

UNRECOGNIZED

public static final TransactionOptions.ReadWrite.ReadLockMode UNRECOGNIZED

Field Details

READ_LOCK_MODE_UNSPECIFIED_VALUE

public static final int READ_LOCK_MODE_UNSPECIFIED_VALUE

 Default value.

 * If isolation level is
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE],
 locking semantics default to `PESSIMISTIC`.
 * If isolation level is
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ],
 locking semantics default to `OPTIMISTIC`.
 * See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control)
 for more details.
 

READ_LOCK_MODE_UNSPECIFIED = 0;

See Also:

• Constant Field Values

PESSIMISTIC_VALUE

public static final int PESSIMISTIC_VALUE

 Pessimistic lock mode.

 Lock acquisition behavior depends on the isolation level in use. In
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE]
 isolation, reads and writes acquire necessary locks during transaction
 statement execution. In
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ]
 isolation, reads that explicitly request to be locked and writes
 acquire locks.
 See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control) for
 details on the types of locks acquired at each transaction step.
 

PESSIMISTIC = 1;

See Also:

• Constant Field Values

OPTIMISTIC_VALUE

public static final int OPTIMISTIC_VALUE

 Optimistic lock mode.

 Lock acquisition behavior depends on the isolation level in use. In
 both
 [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE]
 and
 [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ]
 isolation, reads and writes do not acquire locks during transaction
 statement execution.
 See
 [Concurrency
 control](https://cloud.google.com/spanner/docs/concurrency-control) for
 details on how the guarantees of each isolation level are provided at
 commit time.
 

OPTIMISTIC = 2;

See Also:

• Constant Field Values

Method Details

values

public static TransactionOptions.ReadWrite.ReadLockMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared.

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static TransactionOptions.ReadWrite.ReadLockMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

getNumber

public final int getNumber()

Specified by:

getNumber in interface com.google.protobuf.Internal.EnumLite

Specified by:

getNumber in interface com.google.protobuf.ProtocolMessageEnum

valueOf

@Deprecated
public static TransactionOptions.ReadWrite.ReadLockMode valueOf(int value)

Deprecated.

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

value - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

forNumber

public static TransactionOptions.ReadWrite.ReadLockMode forNumber(int value)

Parameters:

value - The numeric wire value of the corresponding enum entry.

Returns:

The enum associated with the given numeric wire value.

internalGetValueMap

public static com.google.protobuf.Internal.EnumLiteMap<TransactionOptions.ReadWrite.ReadLockMode> internalGetValueMap()

getValueDescriptor

public final com.google.protobuf.Descriptors.EnumValueDescriptor getValueDescriptor()

Specified by:

getValueDescriptor in interface com.google.protobuf.ProtocolMessageEnum

getDescriptorForType

public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType()

Specified by:

getDescriptorForType in interface com.google.protobuf.ProtocolMessageEnum

getDescriptor

public static com.google.protobuf.Descriptors.EnumDescriptor getDescriptor()

valueOf

public static TransactionOptions.ReadWrite.ReadLockMode valueOf(com.google.protobuf.Descriptors.EnumValueDescriptor desc)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

desc - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null