oracle.fabric.blocks.event

Enum ConsistencyLevel

java.lang.Object

java.lang.Enum<ConsistencyLevel>

oracle.fabric.blocks.event.ConsistencyLevel

All Implemented Interfaces:

Serializable, Comparable<ConsistencyLevel>

public enum ConsistencyLevel
extends Enum<ConsistencyLevel>

Consistency level for BusinessEvent subscriptions.

Enum Constant Summary

Enum Constants

Enum Constant and Description
GUARANTEED_DELIVERY The event is guaranteed to arrive.
IMMEDIATE Deprecated.
JOIN The event will be delivered on the thread/transaction that dequeues the message.
ONE_AND_ONLY_ONE The event will arrive once and only once.

Method Summary

Modifier and Type	Method and Description
static ConsistencyLevel	fromString(String s)
boolean	isHigher(ConsistencyLevel level)
static ConsistencyLevel	valueOf(String name) Returns the enum constant of this type with the specified name.
static ConsistencyLevel[]	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

ONE_AND_ONLY_ONE

public static final ConsistencyLevel ONE_AND_ONLY_ONE

The event will arrive once and only once. This is the stronger (but less efficient) of the consistency levels. Before delivery of the event, the BusinessEventBus will create a new global transaction. If the BusinessEventProcessor returns normally, the transaction will be committed. If an exception is thrown, the BusinessEventProcessor will retry up to a configured (at the bus level) number of times. Once the retry limit is passed it will be placed in a "dead event" queue.

GUARANTEED_DELIVERY

public static final ConsistencyLevel GUARANTEED_DELIVERY

The event is guaranteed to arrive. Duplicates are possible. This is the weaker (but more efficient) of the consistency levels. The event will be delivered to the BusinessEventProcessor. Once the processor returns control, the event will be considered delivered -- even if control is returned via an exception.

JOIN

public static final ConsistencyLevel JOIN

The event will be delivered on the thread/transaction that dequeues the message. Any exception will cause the dequeue to be rolled back.

IMMEDIATE

@Deprecated
public static final ConsistencyLevel IMMEDIATE

Deprecated.

The event will be delivered on the publisher's thread and transaction. Any exceptions thrown by the subscriber will be caught, logged and then ignored.

Method Detail

values

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

Returns:

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

valueOf

public static ConsistencyLevel 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

isHigher

public boolean isHigher(ConsistencyLevel level)

fromString

public static ConsistencyLevel fromString(String s)