RoundRobinLoadBalancer

java.lang.Object
- io.grpc.LoadBalancer
- - io.grpc.util.MultiChildLoadBalancer
  - - io.grpc.util.RoundRobinLoadBalancer

```
final class RoundRobinLoadBalancer
extends MultiChildLoadBalancer
```
A LoadBalancer that provides round-robin load-balancing over the EquivalentAddressGroups from the NameResolver.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

(package private) static class RoundRobinLoadBalancer.ReadyPicker
- Nested classes/interfaces inherited from class io.grpc.util.MultiChildLoadBalancer
  MultiChildLoadBalancer.AcceptResolvedAddrRetVal, MultiChildLoadBalancer.ChildLbState, MultiChildLoadBalancer.Endpoint
- Nested classes/interfaces inherited from class io.grpc.LoadBalancer
  LoadBalancer.CreateSubchannelArgs, LoadBalancer.ErrorPicker, LoadBalancer.Factory, LoadBalancer.FixedResultPicker, LoadBalancer.Helper, LoadBalancer.PickDetailsConsumer, LoadBalancer.PickResult, LoadBalancer.PickSubchannelArgs, LoadBalancer.ResolvedAddresses, LoadBalancer.Subchannel, LoadBalancer.SubchannelPicker, LoadBalancer.SubchannelStateListener

Field Summary

Fields
Modifier and Type Field Description

private LoadBalancer.SubchannelPicker currentPicker

private java.util.concurrent.atomic.AtomicInteger sequence
- Fields inherited from class io.grpc.util.MultiChildLoadBalancer
  currentConnectivityState, pickFirstLbProvider, resolvingAddresses
- Fields inherited from class io.grpc.LoadBalancer
  ATTR_HEALTH_CHECKING_CONFIG, DISABLE_SUBCHANNEL_RECONNECT_KEY, EMPTY_PICKER, HAS_HEALTH_PRODUCER_LISTENER_KEY, HEALTH_CONSUMER_LISTENER_ARG_KEY, IS_PETIOLE_POLICY

Constructor Summary

Constructors
Constructor Description

RoundRobinLoadBalancer(LoadBalancer.Helper helper)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected MultiChildLoadBalancer.ChildLbState`	`createChildLbState(java.lang.Object key)`	Override to create an instance of a subclass.
`private LoadBalancer.SubchannelPicker`	`createReadyPicker(java.util.Collection<MultiChildLoadBalancer.ChildLbState> children)`
`private void`	`updateBalancingState(ConnectivityState state, LoadBalancer.SubchannelPicker picker)`
`protected void`	`updateOverallBalancingState()`	Updates picker with the list of active subchannels (state == READY).

Methods inherited from class io.grpc.util.MultiChildLoadBalancer
acceptResolvedAddresses, acceptResolvedAddressesInternal, aggregateState, createChildAddressesMap, getChildLbState, getChildLbStateEag, getChildLbStates, getHelper, getReadyChildren, handleNameResolutionError, shutdown, shutdownRemoved

Methods inherited from class io.grpc.LoadBalancer
canHandleEmptyAddressListFromNameResolution, handleResolvedAddresses, handleSubchannelState, requestConnection

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

sequence

private final java.util.concurrent.atomic.AtomicInteger sequence

currentPicker

private LoadBalancer.SubchannelPicker currentPicker

Constructor Detail

RoundRobinLoadBalancer

public RoundRobinLoadBalancer(LoadBalancer.Helper helper)

Method Detail

updateOverallBalancingState
```
protected void updateOverallBalancingState()
```
Updates picker with the list of active subchannels (state == READY).

Specified by:

updateOverallBalancingState in class MultiChildLoadBalancer

updateBalancingState

private void updateBalancingState(ConnectivityState state,
                                  LoadBalancer.SubchannelPicker picker)

createReadyPicker

private LoadBalancer.SubchannelPicker createReadyPicker(java.util.Collection<MultiChildLoadBalancer.ChildLbState> children)

createChildLbState
```
protected MultiChildLoadBalancer.ChildLbState createChildLbState(java.lang.Object key)
```
Description copied from class: MultiChildLoadBalancer

Override to create an instance of a subclass.

Overrides:

createChildLbState in class MultiChildLoadBalancer