com.linecorp.armeria.client

Interface Client<I extends Request,O extends Response>

Type Parameters:

I - the type of outgoing Request. Must be HttpRequest or RpcRequest.

O - the type of incoming Response. Must be HttpResponse or RpcResponse.

All Superinterfaces:

Unwrappable

All Known Subinterfaces:

HttpClient, RpcClient

All Known Implementing Classes:

AbstractCircuitBreakerClient, AbstractConcurrencyLimitingClient, AbstractRetryingClient, CircuitBreakerClient, CircuitBreakerHttpClient, CircuitBreakerRpcClient, ConcurrencyLimitingClient, ConcurrencyLimitingHttpClient, ContentPreviewingClient, DecodingClient, DecoratingClient, HttpDecodingClient, LoggingClient, LoggingRpcClient, MetricCollectingClient, MetricCollectingRpcClient, RetryingClient, RetryingHttpClient, RetryingRpcClient, SimpleDecoratingClient, SimpleDecoratingHttpClient, SimpleDecoratingRpcClient

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Client<I extends Request,O extends Response>
extends Unwrappable

Sends a Request to a remote Endpoint.

Note that this interface is not a user's entry point for sending a Request. It is rather a generic request processor interface implemented by a DecoratingClient, which intercepts a Request. A user is supposed to make his or her Request via the object returned by a ClientBuilder or Clients, which usually does not implement this interface.

See Also:

UserClient

Method Summary

Modifier and Type	Method and Description
default <T> T	as(Class<T> type) Unwraps this Client into the object of the specified type.
O	execute(ClientRequestContext ctx, I req) Sends a Request to a remote Endpoint, as specified in ClientRequestContext.endpoint().

Method Detail

execute

O execute(ClientRequestContext ctx,
          I req)
   throws Exception

Sends a Request to a remote Endpoint, as specified in ClientRequestContext.endpoint().

Returns:

the Response to the specified Request

Throws:

Exception

as

default <T> T as(Class<T> type)

Unwraps this Client into the object of the specified type. Use this method instead of an explicit downcast. For example:

 WebClient client = WebClient.builder(...)
                             .decorator(LoggingClient.newDecorator())
                             .build();

 LoggingClient unwrapped = client.as(LoggingClient.class);

 // You can also use Clients.unwrap(), which is useful especially for
 // Thrift and gRPC where the client object does not implement the 'as()' method.
 LoggingClient unwrapped2 = Clients.unwrap(client, LoggingClient.class);
 

Specified by:

as in interface Unwrappable

Parameters:

type - the type of the object to return

Returns:

the object of the specified type if found, or null if not found.

See Also:

Clients.unwrap(Object, Class), ClientFactory.unwrap(Object, Class), Unwrappable