com.alibaba.csp.sentinel.slots.block.degrade

Class DegradeRule

java.lang.Object

com.alibaba.csp.sentinel.slots.block.AbstractRule

com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule

All Implemented Interfaces:

Rule

public class DegradeRule
extends AbstractRule

Degrade is used when the resources are in an unstable state, these resources will be degraded within the next defined time window. There are two ways to measure whether a resource is stable or not:

• Average response time (DEGRADE_GRADE_RT): When the average RT exceeds the threshold ('count' in 'DegradeRule', in milliseconds), the resource enters a quasi-degraded state. If the RT of next coming 5 requests still exceed this threshold, this resource will be downgraded, which means that in the next time window (defined in 'timeWindow', in seconds) all the access to this resource will be blocked.
• Exception ratio: When the ratio of exception count per second and the success qps exceeds the threshold, access to the resource will be blocked in the coming window.

Author:

jialiang.linjl

Constructor Summary

Constructors

Constructor and Description
DegradeRule()
DegradeRule(String resourceName)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
double	getCount()
int	getGrade()
AtomicLong	getPassCount()
int	getTimeWindow()
int	hashCode()
boolean	passCheck(Context context, DefaultNode node, int acquireCount, Object... args) Check whether current statistical indicators meet this rule, which means not exceeding any threshold.
DegradeRule	setCount(double count)
DegradeRule	setGrade(int grade)
DegradeRule	setTimeWindow(int timeWindow)
String	toString()

Methods inherited from class com.alibaba.csp.sentinel.slots.block.AbstractRule

as, getLimitApp, getResource, setLimitApp, setResource

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DegradeRule

public DegradeRule()

DegradeRule

public DegradeRule(String resourceName)

Method Detail

getGrade

public int getGrade()

setGrade

public DegradeRule setGrade(int grade)

getCount

public double getCount()

setCount

public DegradeRule setCount(double count)

getPassCount

public AtomicLong getPassCount()

getTimeWindow

public int getTimeWindow()

setTimeWindow

public DegradeRule setTimeWindow(int timeWindow)

equals

public boolean equals(Object o)

Overrides:

equals in class AbstractRule

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractRule

passCheck

public boolean passCheck(Context context,
                         DefaultNode node,
                         int acquireCount,
                         Object... args)

Description copied from interface: Rule

Check whether current statistical indicators meet this rule, which means not exceeding any threshold.

Parameters:

context - current Context

node - current Node

acquireCount - tokens needed.

args - arguments of the original invocation.

Returns:

If current statistical indicators not exceeding any threshold return true, otherwise return false.

toString

public String toString()

Overrides:

toString in class Object