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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.hc.client5.http.routing;
import org.apache.hc.client5.http.HttpRoute;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.protocol.HttpContext;
/**
* Encapsulates logic to compute a {@link HttpRoute} to a target host.
* Implementations may for example be based on parameters, or on the
* standard Java system properties.
*
* Implementations of this interface must be thread-safe. Access to shared
* data must be synchronized as methods of this interface may be executed
* from multiple threads.
*
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.STATELESS)
public interface HttpRoutePlanner {
/**
* Determines the route for the given host.
*
* @param target the target host for the request.
* @param context the context to use for the subsequent execution.
* Implementations may accept {@code null}.
*
* @return the route that the request should take
*
* @throws HttpException in case of a problem
*/
HttpRoute determineRoute(HttpHost target, HttpContext context) throws HttpException;
/**
* Determines the route for the given host.
*
* @param target the target host for the request.
* @param request the request message. Can be {@code null} if not given / known.
* @param context the context to use for the subsequent execution.
* Implementations may accept {@code null}.
*
* @return the route that the request should take
* @throws HttpException in case of a problem.
*
* @since 5.4
*/
default HttpRoute determineRoute(HttpHost target, HttpRequest request, HttpContext context) throws HttpException {
return determineRoute(target, context);
}
}
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