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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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 * KIND, either express or implied.  See the License for the
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 * under the License.
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 * This software consists of voluntary contributions made by many
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package org.apache.http.conn.routing;

import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.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 */ public interface HttpRoutePlanner { /** * Determines the route for a request. * * @param target the target host for the request. * Implementations may accept {@code null} * if they can still determine a route, for example * to a default target or by inspecting the request. * @param request the request to execute * @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 */ public HttpRoute determineRoute(HttpHost target, HttpRequest request, HttpContext context) throws HttpException; }




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