alluxio.master.journal

Enum JournalSystem.Mode

java.lang.Object

java.lang.Enum<JournalSystem.Mode>

alluxio.master.journal.JournalSystem.Mode

All Implemented Interfaces:

Serializable, Comparable<JournalSystem.Mode>

Enclosing interface:

JournalSystem

public static enum JournalSystem.Mode
extends Enum<JournalSystem.Mode>

The mode of the journal system. Journal systems begin in STANDBY mode by default. The JournalSystem.gainPrimacy() and JournalSystem.losePrimacy() methods may be used to transition between journal modes.

Enum Constant Summary

Enum Constants

Enum Constant and Description
PRIMARY In this mode, journal entries may be written.
STANDBY In this mode, journal entries may not be written.

Method Summary

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

PRIMARY

public static final JournalSystem.Mode PRIMARY

In this mode, journal entries may be written. Written journal entries will not be applied to journals' state machines.

STANDBY

public static final JournalSystem.Mode STANDBY

In this mode, journal entries may not be written. Journal entries written by the primary will be applied to journals' state machines.

Method Detail

values

public static JournalSystem.Mode[] 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 (JournalSystem.Mode c : JournalSystem.Mode.values())
    System.out.println(c);

Returns:

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

valueOf

public static JournalSystem.Mode 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