org.apache.jena.query

Enum TxnType

java.lang.Object

java.lang.Enum<TxnType>

org.apache.jena.query.TxnType

All Implemented Interfaces:

Serializable, Comparable<TxnType>

public enum TxnType
extends Enum<TxnType>

Enum Constant Summary

Enum Constants

Enum Constant and Description
READ Transaction mode: WRITE: this guarantees a WRITE will complete if commit() is called.
READ_COMMITTED_PROMOTE
READ_PROMOTE
WRITE

Method Summary

Modifier and Type	Method and Description
static TxnType	convert(ReadWrite rw) Convert a ReadWrite mode to TxnType
static ReadWrite	convert(TxnType txnType) Convert a TxnType mode to ReadWrite : "promote" not supported.
static ReadWrite	initial(TxnType txnType) Translate a TxnType to it's initial ReadWrite mode.
static TxnType	promote(Transactional.Promote promoteMode) Convert a TxnType mode to ReadWrite : "promote" not supported.
static TxnType	valueOf(String name) Returns the enum constant of this type with the specified name.
static TxnType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

READ

public static final TxnType READ

Transaction mode:

• WRITE: this guarantees a WRITE will complete if commit() is called. The same as begin(ReadWrite.WRITE).
• READ: the transaction can not promote to WRITE,ensuring read-only access to the data. The same as begin(ReadWrite.READ).
• READ_PROMOTE: the transaction will go from "read" to "write" if the dataset has not been modified but if it has, the promotion fails with exception.
• READ_COMMITTED_PROMOTE: Use this with care. The promotion will succeed but changes from other transactions become visible.

Read committed: at the point transaction attempts promotion from "read" to "write", the system checks if the dataset has changed since the transaction started (called begin). If READ_PROMOTE, the dataset must not have changed; if READ_COMMITTED_PROMOTE any intermediate changes are visible but the application can not assume any data it has read in the transaction is the same as it was at the point the transaction started.

WRITE

public static final TxnType WRITE

READ_PROMOTE

public static final TxnType READ_PROMOTE

READ_COMMITTED_PROMOTE

public static final TxnType READ_COMMITTED_PROMOTE

Method Detail

values

public static TxnType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (TxnType c : TxnType.values())
    System.out.println(c);

Returns:

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

valueOf

public static TxnType 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

convert

public static TxnType convert(ReadWrite rw)

Convert a ReadWrite mode to TxnType

convert

public static ReadWrite convert(TxnType txnType)

Convert a TxnType mode to ReadWrite : "promote" not supported.

initial

public static ReadWrite initial(TxnType txnType)

Translate a TxnType to it's initial ReadWrite mode. WRITE -> WRITE, READ* -> READ regardless of promotion setting.

promote

public static TxnType promote(Transactional.Promote promoteMode)

Convert a TxnType mode to ReadWrite : "promote" not supported.