org.springframework.cloud.client.loadbalancer

Interface LoadBalancerClient

All Superinterfaces:

ServiceInstanceChooser

public interface LoadBalancerClient
extends ServiceInstanceChooser

Represents a client-side load balancer.

Author:

Spencer Gibb

Method Summary

Modifier and Type	Method and Description
<T> T	execute(String serviceId, LoadBalancerRequest<T> request) Executes request using a ServiceInstance from the LoadBalancer for the specified service.
<T> T	execute(String serviceId, ServiceInstance serviceInstance, LoadBalancerRequest<T> request) Executes request using a ServiceInstance from the LoadBalancer for the specified service.
URI	reconstructURI(ServiceInstance instance, URI original) Creates a proper URI with a real host and port for systems to utilize.

Methods inherited from interface org.springframework.cloud.client.loadbalancer.ServiceInstanceChooser

choose

Method Detail

execute

<T> T execute(String serviceId,
              LoadBalancerRequest<T> request)
       throws IOException

Executes request using a ServiceInstance from the LoadBalancer for the specified service.

Type Parameters:

T - type of the response

Parameters:

serviceId - The service ID to look up the LoadBalancer.

request - Allows implementations to execute pre and post actions, such as incrementing metrics.

Returns:

The result of the LoadBalancerRequest callback on the selected ServiceInstance.

Throws:

IOException - in case of IO issues.

execute

<T> T execute(String serviceId,
              ServiceInstance serviceInstance,
              LoadBalancerRequest<T> request)
       throws IOException

Executes request using a ServiceInstance from the LoadBalancer for the specified service.

Type Parameters:

T - type of the response

Parameters:

serviceId - The service ID to look up the LoadBalancer.

serviceInstance - The service to execute the request to.

request - Allows implementations to execute pre and post actions, such as incrementing metrics.

Returns:

The result of the LoadBalancerRequest callback on the selected ServiceInstance.

Throws:

IOException - in case of IO issues.

reconstructURI

URI reconstructURI(ServiceInstance instance,
                   URI original)

Creates a proper URI with a real host and port for systems to utilize. Some systems use a URI with the logical service name as the host, such as http://myservice/path/to/service. This will replace the service name with the host:port from the ServiceInstance.

Parameters:

instance - service instance to reconstruct the URI

original - A URI with the host as a logical service name.

Returns:

A reconstructed URI.