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Java example source code file (HttpRoutePlanner.java)

This example source code file (HttpRoutePlanner.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

httpcontext, httpexception, httprequest, httproute, httprouteplanner

The HttpRoutePlanner.java example source code

/*
 * ====================================================================
 * 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
 * <http://www.apache.org/>.
 *
 */

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.
 * <p>
 * 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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