com.netflix.loadbalancer
Class CompositePredicate

java.lang.Object
  com.netflix.loadbalancer.AbstractServerPredicate
      com.netflix.loadbalancer.CompositePredicate

All Implemented Interfaces:

com.google.common.base.Predicate<PredicateKey>

public class CompositePredicate
extends AbstractServerPredicate

A predicate that is composed from one or more predicates in "AND" relationship. It also has the functionality of "fallback" to one of more different predicates. If the primary predicate yield too few filtered servers from the getEligibleServers(List, Object) API, it will try the fallback predicates one by one, until the number of filtered servers exceeds certain number threshold or percentage threshold.

Nested Class Summary

static class

CompositePredicate.Builder

Field Summary

Fields inherited from class com.netflix.loadbalancer.AbstractServerPredicate

rule

Constructor Summary

CompositePredicate()

Method Summary

boolean	apply(PredicateKey input)
java.util.List<Server>	getEligibleServers(java.util.List<Server> servers, java.lang.Object loadBalancerKey) Get the filtered servers from primary predicate, and if the number of the filtered servers are not enough, trying the fallback predicates
static CompositePredicate.Builder	withPredicate(AbstractServerPredicate primaryPredicate)
static CompositePredicate.Builder	withPredicates(AbstractServerPredicate... primaryPredicates)

Methods inherited from class com.netflix.loadbalancer.AbstractServerPredicate

alwaysTrue, chooseRandomlyAfterFiltering, chooseRandomlyAfterFiltering, chooseRoundRobinAfterFiltering, chooseRoundRobinAfterFiltering, getEligibleServers, getLBStats, getServerOnlyPredicate, ofKeyPredicate, ofServerPredicate, setLoadBalancerStats

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.base.Predicate

equals

Constructor Detail

CompositePredicate

public CompositePredicate()

Method Detail

apply

public boolean apply(@Nullable
                     PredicateKey input)

withPredicates

public static CompositePredicate.Builder withPredicates(AbstractServerPredicate... primaryPredicates)

withPredicate

public static CompositePredicate.Builder withPredicate(AbstractServerPredicate primaryPredicate)

getEligibleServers

public java.util.List<Server> getEligibleServers(java.util.List<Server> servers,
                                                 java.lang.Object loadBalancerKey)

Get the filtered servers from primary predicate, and if the number of the filtered servers are not enough, trying the fallback predicates

Overrides:

getEligibleServers in class AbstractServerPredicate