com.netflix.astyanax.connectionpool.impl
Class AbstractLatencyScoreStrategyImpl

java.lang.Object
  com.netflix.astyanax.connectionpool.impl.AbstractLatencyScoreStrategyImpl

All Implemented Interfaces:

LatencyScoreStrategy

Direct Known Subclasses:

EmaLatencyScoreStrategyImpl, SmaLatencyScoreStrategyImpl

public abstract class AbstractLatencyScoreStrategyImpl
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 int	DEFAULT_BLOCKED_THREAD_THRESHOLD
static double	DEFAULT_KEEP_RATIO
static int	DEFAULT_RESET_INTERVAL
static double	DEFAULT_SCORE_THRESHOLD
static int	DEFAULT_UPDATE_INTERVAL

Constructor Summary

AbstractLatencyScoreStrategyImpl(java.lang.String name)

AbstractLatencyScoreStrategyImpl(java.lang.String name, int updateInterval, int resetInterval)

AbstractLatencyScoreStrategyImpl(java.lang.String name, int updateInterval, int resetInterval, int blockedThreshold, double keepRatio, double scoreThreshold)

AbstractLatencyScoreStrategyImpl(java.lang.String name, int updateInterval, int resetInterval, int blockedThreshold, double keepRatio, double scoreThreshold, java.util.concurrent.ScheduledExecutorService executor)

Method Summary

LatencyScoreStrategy.Instance	createInstance() Create a new instance to associate with an endpoint
int	getBlockedThreshold()
double	getKeepRatio()
int	getResetInterval()
double	getScoreThreshold()
int	getUpdateInterval()
protected abstract LatencyScoreStrategy.Instance	newInstance() Template method for creating a new latency tracking instance for a host
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>> srcPools, 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.
void	update() Update all instance scores

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_UPDATE_INTERVAL

public static final int DEFAULT_UPDATE_INTERVAL

See Also:

Constant Field Values

DEFAULT_RESET_INTERVAL

public static final int DEFAULT_RESET_INTERVAL

See Also:

Constant Field Values

DEFAULT_BLOCKED_THREAD_THRESHOLD

public static final int DEFAULT_BLOCKED_THREAD_THRESHOLD

See Also:

Constant Field Values

DEFAULT_KEEP_RATIO

public static final double DEFAULT_KEEP_RATIO

See Also:

Constant Field Values

DEFAULT_SCORE_THRESHOLD

public static final double DEFAULT_SCORE_THRESHOLD

See Also:

Constant Field Values

Constructor Detail

AbstractLatencyScoreStrategyImpl

public AbstractLatencyScoreStrategyImpl(java.lang.String name,
                                        int updateInterval,
                                        int resetInterval,
                                        int blockedThreshold,
                                        double keepRatio,
                                        double scoreThreshold,
                                        java.util.concurrent.ScheduledExecutorService executor)

AbstractLatencyScoreStrategyImpl

public AbstractLatencyScoreStrategyImpl(java.lang.String name,
                                        int updateInterval,
                                        int resetInterval,
                                        int blockedThreshold,
                                        double keepRatio,
                                        double scoreThreshold)

Parameters:

name -

updateInterval - In milliseconds

resetInterval - In milliseconds

AbstractLatencyScoreStrategyImpl

public AbstractLatencyScoreStrategyImpl(java.lang.String name,
                                        int updateInterval,
                                        int resetInterval)

AbstractLatencyScoreStrategyImpl

public AbstractLatencyScoreStrategyImpl(java.lang.String name)

Method Detail

createInstance

public final LatencyScoreStrategy.Instance createInstance()

Description copied from interface: LatencyScoreStrategy

Create a new instance to associate with an endpoint

Specified by:

createInstance in interface LatencyScoreStrategy

Returns:

newInstance

protected abstract LatencyScoreStrategy.Instance newInstance()

Template method for creating a new latency tracking instance for a host

Returns:

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

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

sortAndfilterPartition

public <CL> java.util.List<HostConnectionPool<CL>> sortAndfilterPartition(java.util.List<HostConnectionPool<CL>> srcPools,
                                                                          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:

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

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