com.netflix.loadbalancer

Class LoadBalancerContext

java.lang.Object

com.netflix.loadbalancer.LoadBalancerContext

Type Parameters:

T - Type of the request

S - Type of the response

All Implemented Interfaces:

com.netflix.client.IClientConfigAware

Direct Known Subclasses:

LoadBalancerExecutor

public class LoadBalancerContext
extends java.lang.Object
implements com.netflix.client.IClientConfigAware

A class contains APIs intended to be used be load balancing client which is subclass of this class.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.String	clientName
protected com.netflix.client.RetryHandler	defaultRetryHandler
protected int	maxAutoRetries
protected int	maxAutoRetriesNextServer
protected boolean	okToRetryOnAllOperations
protected java.lang.String	vipAddresses

Constructor Summary

Constructors

Constructor and Description
LoadBalancerContext(ILoadBalancer lb)
LoadBalancerContext(ILoadBalancer lb, com.netflix.client.config.IClientConfig clientConfig) Delegate to initWithNiwsConfig(IClientConfig)
LoadBalancerContext(ILoadBalancer lb, com.netflix.client.config.IClientConfig clientConfig, com.netflix.client.RetryHandler handler)

Method Summary

Methods

Modifier and Type	Method and Description
protected com.netflix.util.Pair<java.lang.String,java.lang.Integer>	deriveHostAndPortFromVipAddress(java.lang.String vipAddress) Derive the host and port from virtual address if virtual address is indeed contains the actual host and port of the server.
protected com.netflix.util.Pair<java.lang.String,java.lang.Integer>	deriveSchemeAndPortFromPartialUri(java.net.URI uri) Derive scheme and port from a partial URI.
protected com.netflix.client.ClientException	generateNIWSException(java.lang.String uri, java.lang.Throwable e)
java.lang.String	getClientName()
protected java.lang.Throwable	getDeepestCause(java.lang.Throwable e)
protected int	getDefaultPortFromScheme(java.lang.String scheme) Get the default port of the target server given the scheme of vip address if it is available.
protected com.netflix.servo.monitor.Timer	getExecuteTracer()
ILoadBalancer	getLoadBalancer()
int	getMaxAutoRetries() Deprecated.
int	getMaxAutoRetriesNextServer() Deprecated.
protected int	getNumberRetriesOnSameServer(com.netflix.client.config.IClientConfig overriddenClientConfig)
protected int	getRetriesNextServer(com.netflix.client.config.IClientConfig overriddenClientConfig)
com.netflix.client.RetryHandler	getRetryHandler()
protected Server	getServerFromLoadBalancer(java.net.URI original, java.lang.Object loadBalancerKey) Compute the final URI from a partial URI in the request.
ServerStats	getServerStats(Server server)
protected boolean	handleSameServerRetry(Server server, int currentRetryCount, int maxRetries, java.lang.Throwable e)
void	initWithNiwsConfig(com.netflix.client.config.IClientConfig clientConfig) Set necessary parameters from client configuration and register with Servo monitors.
boolean	isOkToRetryOnAllOperations()
protected void	noteError(ServerStats stats, com.netflix.client.ClientRequest request, java.lang.Throwable e, long responseTime) This is called after an error is thrown from the client to update related stats.
protected void	noteOpenConnection(ServerStats serverStats) This is usually called just before client execute a request.
protected void	noteRequestCompletion(ServerStats stats, java.lang.Object response, java.lang.Throwable e, long responseTime)
protected void	noteRequestCompletion(ServerStats stats, java.lang.Object response, java.lang.Throwable e, long responseTime, com.netflix.client.RetryHandler errorHandler) This is called after a response is received or an exception is thrown from the client to update related stats.
protected void	noteResponse(ServerStats stats, com.netflix.client.ClientRequest request, java.lang.Object response, long responseTime) This is called after a response is received from the client to update related stats.
java.net.URI	reconstructURIWithServer(Server server, java.net.URI original)
void	setLoadBalancer(ILoadBalancer lb)
void	setMaxAutoRetries(int maxAutoRetries) Deprecated.
void	setMaxAutoRetriesNextServer(int maxAutoRetriesNextServer) Deprecated.
void	setOkToRetryOnAllOperations(boolean okToRetryOnAllOperations)
void	setRetryHandler(com.netflix.client.RetryHandler retryHandler)

Methods inherited from class java.lang.Object

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

Field Detail

clientName

protected java.lang.String clientName

vipAddresses

protected java.lang.String vipAddresses

maxAutoRetriesNextServer

protected int maxAutoRetriesNextServer

maxAutoRetries

protected int maxAutoRetries

defaultRetryHandler

protected com.netflix.client.RetryHandler defaultRetryHandler

okToRetryOnAllOperations

protected boolean okToRetryOnAllOperations

Constructor Detail

LoadBalancerContext

public LoadBalancerContext(ILoadBalancer lb)

LoadBalancerContext

public LoadBalancerContext(ILoadBalancer lb,
                   com.netflix.client.config.IClientConfig clientConfig)

Delegate to initWithNiwsConfig(IClientConfig)

Parameters:

clientConfig -

LoadBalancerContext

public LoadBalancerContext(ILoadBalancer lb,
                   com.netflix.client.config.IClientConfig clientConfig,
                   com.netflix.client.RetryHandler handler)

Method Detail

initWithNiwsConfig

public void initWithNiwsConfig(com.netflix.client.config.IClientConfig clientConfig)

Set necessary parameters from client configuration and register with Servo monitors.

Specified by:

initWithNiwsConfig in interface com.netflix.client.IClientConfigAware

getExecuteTracer

protected com.netflix.servo.monitor.Timer getExecuteTracer()

getClientName

public java.lang.String getClientName()

getLoadBalancer

public ILoadBalancer getLoadBalancer()

setLoadBalancer

public void setLoadBalancer(ILoadBalancer lb)

getMaxAutoRetriesNextServer

@Deprecated
public int getMaxAutoRetriesNextServer()

Deprecated.

Use getRetryHandler()

setMaxAutoRetriesNextServer

@Deprecated
public void setMaxAutoRetriesNextServer(int maxAutoRetriesNextServer)

Deprecated.

Use setRetryHandler(RetryHandler)

getMaxAutoRetries

@Deprecated
public int getMaxAutoRetries()

Deprecated.

Use getRetryHandler()

setMaxAutoRetries

@Deprecated
public void setMaxAutoRetries(int maxAutoRetries)

Deprecated.

Use setRetryHandler(RetryHandler)

getDeepestCause

protected java.lang.Throwable getDeepestCause(java.lang.Throwable e)

generateNIWSException

protected com.netflix.client.ClientException generateNIWSException(java.lang.String uri,
                                                       java.lang.Throwable e)

noteRequestCompletion

protected void noteRequestCompletion(ServerStats stats,
                         java.lang.Object response,
                         java.lang.Throwable e,
                         long responseTime)

noteRequestCompletion

protected void noteRequestCompletion(ServerStats stats,
                         java.lang.Object response,
                         java.lang.Throwable e,
                         long responseTime,
                         com.netflix.client.RetryHandler errorHandler)

This is called after a response is received or an exception is thrown from the client to update related stats.

noteError

protected void noteError(ServerStats stats,
             com.netflix.client.ClientRequest request,
             java.lang.Throwable e,
             long responseTime)

This is called after an error is thrown from the client to update related stats.

noteResponse

protected void noteResponse(ServerStats stats,
                com.netflix.client.ClientRequest request,
                java.lang.Object response,
                long responseTime)

This is called after a response is received from the client to update related stats.

noteOpenConnection

protected void noteOpenConnection(ServerStats serverStats)

This is usually called just before client execute a request.

deriveSchemeAndPortFromPartialUri

protected com.netflix.util.Pair<java.lang.String,java.lang.Integer> deriveSchemeAndPortFromPartialUri(java.net.URI uri)

Derive scheme and port from a partial URI. For example, for HTTP based client, the URI with only path "/" should return "http" and 80, whereas the URI constructed with scheme "https" and path "/" should return "https" and 443. This method is called by #computeFinalUriWithLoadBalancer(ClientRequest) to get the complete executable URI.

getDefaultPortFromScheme

protected int getDefaultPortFromScheme(java.lang.String scheme)

Get the default port of the target server given the scheme of vip address if it is available. Subclass should override it to provider protocol specific default port number if any.

Parameters:

scheme - from the vip address. null if not present.

Returns:

80 if scheme is http, 443 if scheme is https, -1 else.

deriveHostAndPortFromVipAddress

protected com.netflix.util.Pair<java.lang.String,java.lang.Integer> deriveHostAndPortFromVipAddress(java.lang.String vipAddress)
                                                                                             throws java.net.URISyntaxException,
                                                                                                    com.netflix.client.ClientException

Derive the host and port from virtual address if virtual address is indeed contains the actual host and port of the server. This is the final resort to compute the final URI in #computeFinalUriWithLoadBalancer(ClientRequest) if there is no load balancer available and the request URI is incomplete. Sub classes can override this method to be more accurate or throws ClientException if it does not want to support virtual address to be the same as physical server address.

The virtual address is used by certain load balancers to filter the servers of the same function to form the server pool.

Throws:

java.net.URISyntaxException

com.netflix.client.ClientException

getServerFromLoadBalancer

protected Server getServerFromLoadBalancer(@Nullable
                               java.net.URI original,
                               @Nullable
                               java.lang.Object loadBalancerKey)
                                    throws com.netflix.client.ClientException

Compute the final URI from a partial URI in the request. The following steps are performed:

if host is missing and there is a load balancer, get the host/port from server chosen from load balancer if host is missing and there is no load balancer, try to derive host/port from virtual address set with the client if host is present and the authority part of the URI is a virtual address set for the client, and there is a load balancer, get the host/port from server chosen from load balancer if host is present but none of the above applies, interpret the host as the actual physical address if host is missing but none of the above applies, throws ClientException

Parameters:

original - Original URI passed from caller

Throws:

com.netflix.client.ClientException

reconstructURIWithServer

public java.net.URI reconstructURIWithServer(Server server,
                                    java.net.URI original)

getRetriesNextServer

protected int getRetriesNextServer(com.netflix.client.config.IClientConfig overriddenClientConfig)

getServerStats

public final ServerStats getServerStats(Server server)

getNumberRetriesOnSameServer

protected int getNumberRetriesOnSameServer(com.netflix.client.config.IClientConfig overriddenClientConfig)

handleSameServerRetry

protected boolean handleSameServerRetry(Server server,
                            int currentRetryCount,
                            int maxRetries,
                            java.lang.Throwable e)

getRetryHandler

public final com.netflix.client.RetryHandler getRetryHandler()

setRetryHandler

public final void setRetryHandler(com.netflix.client.RetryHandler retryHandler)

isOkToRetryOnAllOperations

public final boolean isOkToRetryOnAllOperations()

setOkToRetryOnAllOperations

public final void setOkToRetryOnAllOperations(boolean okToRetryOnAllOperations)