com.orbitz.consul.util.failover.strategy

Class BlacklistingConsulFailoverStrategy

java.lang.Object

com.orbitz.consul.util.failover.strategy.BlacklistingConsulFailoverStrategy

All Implemented Interfaces:

ConsulFailoverStrategy

public class BlacklistingConsulFailoverStrategy
extends Object
implements ConsulFailoverStrategy

Author:

Troy Heanssgen

Constructor Summary

Constructors

Constructor and Description
BlacklistingConsulFailoverStrategy(Collection<com.google.common.net.HostAndPort> targets, long timeout) Constructs a blacklisting strategy with a collection of hosts and ports

Method Summary

Modifier and Type	Method and Description
Optional<okhttp3.Request>	computeNextStage(okhttp3.Request previousRequest, okhttp3.Response previousResponse) Computes the next failover stage for the consul failover strategy.
boolean	isRequestViable(okhttp3.Request current) Determines if there is a viable candidate for the next request.
void	markRequestFailed(okhttp3.Request current) Marks the specified request as a failed URL (in case of exceptions and other events that could cause us to never get a response.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlacklistingConsulFailoverStrategy

public BlacklistingConsulFailoverStrategy(Collection<com.google.common.net.HostAndPort> targets,
                                          long timeout)

Constructs a blacklisting strategy with a collection of hosts and ports

Parameters:

targets - A set of viable hosts

Method Detail

computeNextStage

public Optional<okhttp3.Request> computeNextStage(okhttp3.Request previousRequest,
                                                  okhttp3.Response previousResponse)

Description copied from interface: ConsulFailoverStrategy

Computes the next failover stage for the consul failover strategy. This allows the end user to customize the way and methods by which additional failover targets may be selected.

Specified by:

computeNextStage in interface ConsulFailoverStrategy

Parameters:

previousRequest - The last request to go out the door.

previousResponse - The response that returned when previousRequest was completed.

Returns:

An optional failover request. This may return an empty optional, signaling that the request should be aborted

isRequestViable

public boolean isRequestViable(okhttp3.Request current)

Description copied from interface: ConsulFailoverStrategy

Determines if there is a viable candidate for the next request. This lets us short circuit the first attempted request (such as when we know with certainty that a host should not be available) without interfering with the consul client too much.

Specified by:

isRequestViable in interface ConsulFailoverStrategy

Parameters:

current - The current inflight request.

Returns:

A boolean representing if there is another possible request candidate available.

markRequestFailed

public void markRequestFailed(okhttp3.Request current)

Description copied from interface: ConsulFailoverStrategy

Marks the specified request as a failed URL (in case of exceptions and other events that could cause us to never get a response. This avoids infinite loops where the strategy can never be made aware that the request has failed.

Specified by:

markRequestFailed in interface ConsulFailoverStrategy

Parameters:

current - The current request object representing a request that failed