/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.server.handlers.proxy;
import io.undertow.server.HttpServerExchange;
/**
* Yet another callback class, this one used by the proxy handler
*
* @author Stuart Douglas
*/
public interface ProxyCallback<T> {
void completed(final HttpServerExchange exchange, T result);
/**
* Callback if establishing the connection to a backend server fails.
*
* @param exchange the http server exchange
*/
void failed(final HttpServerExchange exchange);
/**
* Callback if no backend server could be found.
*
* @param exchange the http server exchange
*/
void couldNotResolveBackend(final HttpServerExchange exchange);
/**
* This is invoked when the target connection pool transitions to problem status. It will be called once for each queued request
* that has not yet been allocated a connection. The manager can redistribute these requests to other hosts, or can end the
* exchange with an error status.
*
* @param exchange The exchange
*/
void queuedRequestFailed(HttpServerExchange exchange);
}