org.apache.tephra

Enum TxConstants.ConflictDetection

java.lang.Object

java.lang.Enum<TxConstants.ConflictDetection>

org.apache.tephra.TxConstants.ConflictDetection

All Implemented Interfaces:

Serializable, Comparable<TxConstants.ConflictDetection>

Enclosing class:

TxConstants

public static enum TxConstants.ConflictDetection
extends Enum<TxConstants.ConflictDetection>

Defines what level of conflict detection should be used for transactions. ROW means that only the table name and row key for each change will be used to determine if the transaction change sets conflict. COLUMN means that the table name, row key, column family, and column qualifier will all be used to identify write conflicts. NONE means that no conflict detection will be performed, but transaction clients will still track the current transaction's change set to rollback any persisted changes in the event of a failure. This should only be used where writes to the same coordinate should never conflict, such as append-only data. The default value used by TransactionAwareHTable implementations is COLUMN.

Note: for a given table, all clients must use the same conflict detection setting! Otherwise conflicts will not be flagged correctly.

Enum Constant Summary

Enum Constants

Enum Constant and Description
COLUMN
NONE
ROW

Method Summary

Methods

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

ROW

public static final TxConstants.ConflictDetection ROW

COLUMN

public static final TxConstants.ConflictDetection COLUMN

NONE

public static final TxConstants.ConflictDetection NONE

Method Detail

values

public static TxConstants.ConflictDetection[] 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 (TxConstants.ConflictDetection c : TxConstants.ConflictDetection.values())
    System.out.println(c);

Returns:

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

valueOf

public static TxConstants.ConflictDetection 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