org.hawkular.inventory.api.feeds

Class AcceptWithFallbackFeedIdStrategy

java.lang.Object

org.hawkular.inventory.api.feeds.AcceptWithFallbackFeedIdStrategy

All Implemented Interfaces:

FeedIdStrategy

public final class AcceptWithFallbackFeedIdStrategy
extends Object
implements FeedIdStrategy

An ID strategy that by default accepts the proposed ID supplied by the caller.

If a feed with the proposed ID already exists in the given tenant and environment, an optional fallback strategy is used to generate a new ID. If the fallback strategy is not defined, an exception is thrown. This strategy is useful for Hawkular deployments where some of the feeds are incapable of remembering their assigned IDs and need to be pre-configured with one.

Since:

1.0

Author:

Lukas Krejci

Constructor Summary

Constructors

Constructor and Description
AcceptWithFallbackFeedIdStrategy()
AcceptWithFallbackFeedIdStrategy(FeedIdStrategy fallback)

Method Summary

Modifier and Type	Method and Description
String	generate(Inventory inventory, Feed proposedFeed) Generates a unique ID for the provided feed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AcceptWithFallbackFeedIdStrategy

public AcceptWithFallbackFeedIdStrategy()

AcceptWithFallbackFeedIdStrategy

public AcceptWithFallbackFeedIdStrategy(FeedIdStrategy fallback)

Method Detail

generate

public String generate(Inventory inventory,
                       Feed proposedFeed)
                throws EntityAlreadyExistsException

Description copied from interface: FeedIdStrategy

Generates a unique ID for the provided feed. The id of the provided feed is the one proposed by the caller.

Specified by:

generate in interface FeedIdStrategy

Parameters:

inventory - the inventory implementation to optionally consult some constraints

proposedFeed - the feed to be generated with the ID proposed by the caller

Returns:

the ID to be used for the feed, returned to the caller.

Throws:

EntityAlreadyExistsException - if a feed with the proposed ID exists and no alternatives can be proposed by this strategy.