Class TopologyAwareEnsemblePlacementPolicy.DefaultResolver

    • Field Summary

      Modifier and Type Field Description
      (package private) java.util.function.Supplier<java.lang.String> defaultRackSupplier  
    • Constructor Summary

      Constructor Description
      DefaultResolver​(java.util.function.Supplier<java.lang.String> defaultRackSupplier)  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void reloadCachedMappings()
      Reload all of the cached mappings.
      java.util.List<java.lang.String> resolve​(java.util.List<java.lang.String> names)
      Resolves a list of DNS-names/IP-addresses and returns back a list of switch information (network paths).
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • defaultRackSupplier

        final java.util.function.Supplier<java.lang.String> defaultRackSupplier
    • Constructor Detail

      • DefaultResolver

        public DefaultResolver​(java.util.function.Supplier<java.lang.String> defaultRackSupplier)
    • Method Detail

      • resolve

        public java.util.List<java.lang.String> resolve​(java.util.List<java.lang.String> names)
        Description copied from interface: DNSToSwitchMapping
        Resolves a list of DNS-names/IP-addresses and returns back a list of switch information (network paths). One-to-one correspondence must be maintained between the elements in the lists. Consider an element in the argument list - The switch information that is returned must be a network path of the form /foo/rack, where / is the root, and 'foo' is the switch where 'rack' is connected. Note the hostname/ip-address is not part of the returned path. The network topology of the cluster would determine the number of components in the network path.

        If a name cannot be resolved to a rack, the implementation should return NetworkTopology.DEFAULT_REGION_AND_RACK. This is what the bundled implementations do, though it is not a formal requirement

        Specified by:
        resolve in interface DNSToSwitchMapping
        names - the list of hosts to resolve (can be empty)
        list of resolved network paths. If names is empty, the returned list is also empty
      • reloadCachedMappings

        public void reloadCachedMappings()
        Description copied from interface: DNSToSwitchMapping
        Reload all of the cached mappings.

        If there is a cache, this method will clear it, so that future accesses will get a chance to see the new data.

        Specified by:
        reloadCachedMappings in interface DNSToSwitchMapping