com.netflix.astyanax.shallows
Class EmptyLatencyScoreStrategyImpl

java.lang.Object
  com.netflix.astyanax.shallows.EmptyLatencyScoreStrategyImpl

All Implemented Interfaces:

LatencyScoreStrategy

public class EmptyLatencyScoreStrategyImpl
extends java.lang.Object
implements LatencyScoreStrategy

Nested Class Summary

Nested classes/interfaces inherited from interface com.netflix.astyanax.connectionpool.LatencyScoreStrategy

LatencyScoreStrategy.Instance, LatencyScoreStrategy.Listener

Field Summary

static EmptyLatencyScoreStrategyImpl

instance

Constructor Summary

EmptyLatencyScoreStrategyImpl()

Method Summary

LatencyScoreStrategy.Instance	createInstance() Create a new instance to associate with an endpoint
static EmptyLatencyScoreStrategyImpl	get()
int	getBlockedThreshold()
double	getKeepRatio()
int	getResetInterval()
double	getScoreThreshold()
int	getUpdateInterval()
void	removeInstance(LatencyScoreStrategy.Instance instance) Remove the instance for an endpoint that is no longer being tracked
void	reset() Reset all instance scores
void	shutdown() Shutdown the threads created by calling start()
<CL> java.util.List<HostConnectionPool<CL>>	sortAndfilterPartition(java.util.List<HostConnectionPool<CL>> pools, java.util.concurrent.atomic.AtomicBoolean prioritized) Sorts and filters a list of hosts by looking at their up state and score.
void	start(LatencyScoreStrategy.Listener listener) Start updating stats for instances created using createInstance.
java.lang.String	toString()
void	update() Update all instance scores

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static EmptyLatencyScoreStrategyImpl instance

Constructor Detail

EmptyLatencyScoreStrategyImpl

public EmptyLatencyScoreStrategyImpl()

Method Detail

get

public static EmptyLatencyScoreStrategyImpl get()

createInstance

public LatencyScoreStrategy.Instance createInstance()

Description copied from interface: LatencyScoreStrategy

Create a new instance to associate with an endpoint

Specified by:

createInstance in interface LatencyScoreStrategy

Returns:

removeInstance

public void removeInstance(LatencyScoreStrategy.Instance instance)

Description copied from interface: LatencyScoreStrategy

Remove the instance for an endpoint that is no longer being tracked

Specified by:

removeInstance in interface LatencyScoreStrategy

start

public void start(LatencyScoreStrategy.Listener listener)

Description copied from interface: LatencyScoreStrategy

Start updating stats for instances created using createInstance. This usually spawns an update thread as well as a reset thread operating at configurable intervals

Specified by:

start in interface LatencyScoreStrategy

shutdown

public void shutdown()

Description copied from interface: LatencyScoreStrategy

Shutdown the threads created by calling start()

Specified by:

shutdown in interface LatencyScoreStrategy

update

public void update()

Description copied from interface: LatencyScoreStrategy

Update all instance scores

Specified by:

update in interface LatencyScoreStrategy

reset

public void reset()

Description copied from interface: LatencyScoreStrategy

Reset all instance scores

Specified by:

reset in interface LatencyScoreStrategy

sortAndfilterPartition

public <CL> java.util.List<HostConnectionPool<CL>> sortAndfilterPartition(java.util.List<HostConnectionPool<CL>> pools,
                                                                          java.util.concurrent.atomic.AtomicBoolean prioritized)

Description copied from interface: LatencyScoreStrategy

Sorts and filters a list of hosts by looking at their up state and score.

Specified by:

sortAndfilterPartition in interface LatencyScoreStrategy

prioritized - - Will be set to true if the filtered data is prioritized or not. If prioritized then the first element should be selected from by the load balancing strategy. Otherwise round robin could be used.

Returns:

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getUpdateInterval

public int getUpdateInterval()

Specified by:

getUpdateInterval in interface LatencyScoreStrategy

Returns:

Return interval for updating the scores

getResetInterval

public int getResetInterval()

Specified by:

getResetInterval in interface LatencyScoreStrategy

Returns:

Return interval for clearing scores

getScoreThreshold

public double getScoreThreshold()

Specified by:

getScoreThreshold in interface LatencyScoreStrategy

Returns:

Return threshold after which hosts will be excluded if their score is getScoreThreshold() times larger than the best performing node

getBlockedThreshold

public int getBlockedThreshold()

Specified by:

getBlockedThreshold in interface LatencyScoreStrategy

Returns:

Return threshold of blocked connections after which a host is excluded

getKeepRatio

public double getKeepRatio()

Specified by:

getKeepRatio in interface LatencyScoreStrategy

Returns:

Get ratio for calculating minimum number of hosts that most remain in the pool