Package com.hazelcast.gcp
Class GcpDiscoveryStrategyFactory
java.lang.Object
com.hazelcast.gcp.GcpDiscoveryStrategyFactory
- All Implemented Interfaces:
DiscoveryStrategyFactory
Factory class which returns
GcpDiscoveryStrategy
to Discovery SPI.-
Nested Class Summary
Nested classes/interfaces inherited from interface com.hazelcast.spi.discovery.DiscoveryStrategyFactory
DiscoveryStrategyFactory.DiscoveryStrategyLevel
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionLevel of the discovery strategy.Returns a set of the expected configuration properties.Class<? extends DiscoveryStrategy>
Returns the type of theDiscoveryStrategy
itself.boolean
Checks if Hazelcast is running on GCP.newDiscoveryStrategy
(DiscoveryNode discoveryNode, ILogger logger, Map<String, Comparable> properties) Instantiates a new instance of theDiscoveryStrategy
with the given configuration properties.
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Constructor Details
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GcpDiscoveryStrategyFactory
public GcpDiscoveryStrategyFactory()
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Method Details
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getDiscoveryStrategyType
Description copied from interface:DiscoveryStrategyFactory
Returns the type of theDiscoveryStrategy
itself.- Specified by:
getDiscoveryStrategyType
in interfaceDiscoveryStrategyFactory
- Returns:
- the type of the discovery strategy
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newDiscoveryStrategy
public DiscoveryStrategy newDiscoveryStrategy(DiscoveryNode discoveryNode, ILogger logger, Map<String, Comparable> properties) Description copied from interface:DiscoveryStrategyFactory
Instantiates a new instance of theDiscoveryStrategy
with the given configuration properties. The providedHazelcastInstance
can be used to register instances in a service registry whenever the discovery strategy is started.- Specified by:
newDiscoveryStrategy
in interfaceDiscoveryStrategyFactory
- Parameters:
discoveryNode
- the current localDiscoveryNode
, representing the local connection information if running on a Hazelcast member, otherwise on Hazelcast clients alwaysnull
logger
- the logger instanceproperties
- the properties parsed from the configuration- Returns:
- a new instance of the discovery strategy
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getConfigurationProperties
Description copied from interface:DiscoveryStrategyFactory
Returns a set of the expected configuration properties. These properties contain information about the value type of the property, if it is required and a possible validator to automatically test and convert values from the XML configuration.- Specified by:
getConfigurationProperties
in interfaceDiscoveryStrategyFactory
- Returns:
- a set of expected configuration properties
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isAutoDetectionApplicable
public boolean isAutoDetectionApplicable()Checks if Hazelcast is running on GCP.To check if Hazelcast is running on GCP, we first check whether the internal DNS is configured for "google.internal" in either "/etc/resolv.conf" or "/etc/hosts". Such an approach is not officially documented but seems like a good enough heuristic to detect a GCP Compute VM Instance. Since it's not the official method, we still need to make an API call to "metadata.google.internal" which will resolve to a local, non-routable address http://169.254.169.254/. Finally, we check if there is a service account attached for this instance because without a service account Hazelcast GCP discovery will not work.
- Specified by:
isAutoDetectionApplicable
in interfaceDiscoveryStrategyFactory
- Returns:
- true if running on GCP Instance which has a service account attached
- See Also:
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discoveryStrategyLevel
Description copied from interface:DiscoveryStrategyFactory
Level of the discovery strategy.- Specified by:
discoveryStrategyLevel
in interfaceDiscoveryStrategyFactory
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