org.apache.cassandra.locator

Class LocalStrategy

java.lang.Object

org.apache.cassandra.locator.AbstractReplicationStrategy

org.apache.cassandra.locator.LocalStrategy

public class LocalStrategy
extends AbstractReplicationStrategy

Field Summary

Fields inherited from class org.apache.cassandra.locator.AbstractReplicationStrategy

configOptions, snitch

Constructor Summary

Constructors

Constructor and Description
LocalStrategy(java.lang.String keyspaceName, TokenMetadata tokenMetadata, IEndpointSnitch snitch, java.util.Map<java.lang.String,java.lang.String> configOptions)

Method Summary

Methods

Modifier and Type	Method and Description
java.util.List<java.net.InetAddress>	calculateNaturalEndpoints(Token token, TokenMetadata metadata) calculate the natural endpoints for the given token
java.util.ArrayList<java.net.InetAddress>	getNaturalEndpoints(RingPosition searchPosition) We need to override this even if we override calculateNaturalEndpoints, because the default implementation depends on token calculations but LocalStrategy may be used before tokens are set up.
int	getReplicationFactor() calculate the RF based on strategy_options.
java.util.Collection<java.lang.String>	recognizedOptions()
void	validateOptions()

Methods inherited from class org.apache.cassandra.locator.AbstractReplicationStrategy

createReplicationStrategy, getAddressRanges, getAddressRanges, getCachedEndpoints, getClass, getPendingAddressRanges, getPendingAddressRanges, getRangeAddresses, getWriteResponseHandler, hasSameSettings, validateReplicationFactor, validateReplicationStrategy

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalStrategy

public LocalStrategy(java.lang.String keyspaceName,
             TokenMetadata tokenMetadata,
             IEndpointSnitch snitch,
             java.util.Map<java.lang.String,java.lang.String> configOptions)

Method Detail

getNaturalEndpoints

public java.util.ArrayList<java.net.InetAddress> getNaturalEndpoints(RingPosition searchPosition)

We need to override this even if we override calculateNaturalEndpoints, because the default implementation depends on token calculations but LocalStrategy may be used before tokens are set up.

Overrides:

getNaturalEndpoints in class AbstractReplicationStrategy

Parameters:

searchPosition - the position the natural endpoints are requested for

Returns:

a copy of the natural endpoints for the given token

calculateNaturalEndpoints

public java.util.List<java.net.InetAddress> calculateNaturalEndpoints(Token token,
                                                             TokenMetadata metadata)

Description copied from class: AbstractReplicationStrategy

calculate the natural endpoints for the given token

Specified by:

calculateNaturalEndpoints in class AbstractReplicationStrategy

Parameters:

token - the token the natural endpoints are requested for

Returns:

a copy of the natural endpoints for the given token

See Also:

AbstractReplicationStrategy.getNaturalEndpoints(org.apache.cassandra.dht.RingPosition)

getReplicationFactor

public int getReplicationFactor()

Description copied from class: AbstractReplicationStrategy

calculate the RF based on strategy_options. When overwriting, ensure that this get() is FAST, as this is called often.

Specified by:

getReplicationFactor in class AbstractReplicationStrategy

Returns:

the replication factor

validateOptions

public void validateOptions()
                     throws ConfigurationException

Specified by:

validateOptions in class AbstractReplicationStrategy

Throws:

ConfigurationException

recognizedOptions

public java.util.Collection<java.lang.String> recognizedOptions()

Overrides:

recognizedOptions in class AbstractReplicationStrategy