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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
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib;
import ch.boye.httpclientandroidlib.protocol.HttpContext;
/**
* Interface for deciding whether a connection can be re-used for
* subsequent requests and should be kept alive.
* <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 ConnectionReuseStrategy {
/**
* Decides whether a connection can be kept open after a request.
* If this method returns <code>false</code>, the caller MUST
* close the connection to correctly comply with the HTTP protocol.
* If it returns <code>true</code>, the caller SHOULD attempt to
* keep the connection open for reuse with another request.
* <br/>
* One can use the HTTP context to retrieve additional objects that
* may be relevant for the keep-alive strategy: the actual HTTP
* connection, the original HTTP request, target host if known,
* number of times the connection has been reused already and so on.
* <br/>
* If the connection is already closed, <code>false</code> is returned.
* The stale connection check MUST NOT be triggered by a
* connection reuse strategy.
*
* @param response
* The last response received over that connection.
* @param context the context in which the connection is being
* used.
*
* @return <code>true</code> if the connection is allowed to be reused, or
* <code>false</code> if it MUST NOT be reused
*/
boolean keepAlive(HttpResponse response, HttpContext context);
}
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