Class AbstractDNSToSwitchMapping
java.lang.Object
org.apache.storm.networktopography.AbstractDNSToSwitchMapping
- All Implemented Interfaces:
DNSToSwitchMapping
- Direct Known Subclasses:
AlternateRackDNSToSwitchMapping
,DefaultRackDNSToSwitchMapping
This is a base class for DNS to Switch mappings.
It is not mandatory to derive DNSToSwitchMapping
implementations from it, but it is strongly recommended,
as it makes it easy for the developers to add new methods to this base class that are automatically picked up by all
implementations.
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Field Summary
Fields inherited from interface org.apache.storm.networktopography.DNSToSwitchMapping
DEFAULT_RACK
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Constructor Summary
ModifierConstructorDescriptionprotected
Create an unconfigured instance. -
Method Summary
Modifier and TypeMethodDescriptionGenerate a string listing the switch mapping implementation, the mapping for every known node and the number of nodes and unique switches known about -each entry to a separate line.Get a copy of the map (for diagnostics).boolean
Predicate that indicates that the switch mapping is known to be single-switch.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.apache.storm.networktopography.DNSToSwitchMapping
resolve
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Constructor Details
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AbstractDNSToSwitchMapping
protected AbstractDNSToSwitchMapping()Create an unconfigured instance.
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Method Details
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isSingleSwitch
public boolean isSingleSwitch()Predicate that indicates that the switch mapping is known to be single-switch. The base class returns false: it assumes all mappings are multi-rack. Subclasses may override this with methods that are more aware of their topologies.- Returns:
- true if the mapping thinks that it is on a single switch
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getSwitchMap
Get a copy of the map (for diagnostics).- Returns:
- a clone of the map or null for none known
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dumpTopology
Generate a string listing the switch mapping implementation, the mapping for every known node and the number of nodes and unique switches known about -each entry to a separate line.- Returns:
- a string that can be presented to the ops team or used in debug messages.
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