org.apache.tephra

Enum Transaction.VisibilityLevel

java.lang.Object

java.lang.Enum<Transaction.VisibilityLevel>

org.apache.tephra.Transaction.VisibilityLevel

All Implemented Interfaces:

Serializable, Comparable<Transaction.VisibilityLevel>

Enclosing class:

Transaction

public static enum Transaction.VisibilityLevel
extends Enum<Transaction.VisibilityLevel>

Defines the possible visibility levels for read operations.

• SNAPSHOT - uses the transaction's read snapshot, plus includes all write pointers from the current transaction
• SNAPSHOT_EXCLUDE_CURRENT - uses the transaction's read snapshot, plus includes all write pointers from the current transaction, except the current write pointer (see Transaction.getWritePointer())
• SNAPSHOT_ALL - uses the transaction's read snapshot, plus includes all write pointers from the current transaction. This visibility level will lead to raw fetch operations, where all versions (including deletes) visible to current transaction are returned.

The default value used is SNAPSHOT.

See Also:

Transaction.setVisibility(VisibilityLevel)

Enum Constant Summary

Enum Constants

Enum Constant and Description
SNAPSHOT
SNAPSHOT_ALL
SNAPSHOT_EXCLUDE_CURRENT

Method Summary

Modifier and Type	Method and Description
static Transaction.VisibilityLevel	valueOf(String name) Returns the enum constant of this type with the specified name.
static Transaction.VisibilityLevel[]	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 Detail

SNAPSHOT

public static final Transaction.VisibilityLevel SNAPSHOT

SNAPSHOT_EXCLUDE_CURRENT

public static final Transaction.VisibilityLevel SNAPSHOT_EXCLUDE_CURRENT

SNAPSHOT_ALL

public static final Transaction.VisibilityLevel SNAPSHOT_ALL

Method Detail

values

public static Transaction.VisibilityLevel[] 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 (Transaction.VisibilityLevel c : Transaction.VisibilityLevel.values())
    System.out.println(c);

Returns:

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

valueOf

public static Transaction.VisibilityLevel 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