Class GcpDiscoveryStrategyFactory

    • Constructor Detail

      • GcpDiscoveryStrategyFactory

        public GcpDiscoveryStrategyFactory()
    • Method Detail

      • newDiscoveryStrategy

        public DiscoveryStrategy newDiscoveryStrategy​(DiscoveryNode discoveryNode,
                                                      ILogger logger,
                                                      java.util.Map<java.lang.String,​java.lang.Comparable> properties)
        Description copied from interface: DiscoveryStrategyFactory
        Instantiates a new instance of the DiscoveryStrategy with the given configuration properties. The provided HazelcastInstance can be used to register instances in a service registry whenever the discovery strategy is started.
        Specified by:
        newDiscoveryStrategy in interface DiscoveryStrategyFactory
        discoveryNode - the current local DiscoveryNode, representing the local connection information if running on a Hazelcast member, otherwise on Hazelcast clients always null
        logger - the logger instance
        properties - the properties parsed from the configuration
        a new instance of the discovery strategy
      • getConfigurationProperties

        public java.util.Collection<PropertyDefinition> 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 interface DiscoveryStrategyFactory
        a set of expected configuration properties
      • 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 "" which will resolve to a local, non-routable address 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 interface DiscoveryStrategyFactory
        true if running on GCP Instance which has a service account attached
        See Also:
        GCP Managing Instances