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57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_PROXY_DHCP_PROXY_SCRIPT_FETCHER_FACTORY_H_
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#define NET_PROXY_DHCP_PROXY_SCRIPT_FETCHER_FACTORY_H_
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#include <memory>
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#include "base/macros.h"
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#include "base/memory/singleton.h"
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#include "net/base/completion_callback.h"
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#include "net/base/net_export.h"
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#include "net/proxy/dhcp_proxy_script_fetcher.h"
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namespace net {
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class URLRequestContext;
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// Factory object for creating the appropriate concrete base class of
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// DhcpProxyScriptFetcher for your operating system and settings.
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//
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// You might think we could just implement a DHCP client at the protocol
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// level and have cross-platform support for retrieving PAC configuration
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// from DHCP, but unfortunately the DHCP protocol assumes there is a single
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// client per machine (specifically per network interface card), and there
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// is an implicit state machine between the client and server, so adding a
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// second client to the machine would not be advisable (see e.g. some
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// discussion of what can happen at this URL:
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// http://www.net.princeton.edu/multi-dhcp-one-interface-handling.html).
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//
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// Therefore, we have platform-specific implementations, and so we use
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// this factory to select the right one.
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class NET_EXPORT DhcpProxyScriptFetcherFactory {
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public:
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DhcpProxyScriptFetcherFactory();
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virtual ~DhcpProxyScriptFetcherFactory();
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// url_request_context must be valid and its lifetime must exceed that of the
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// returned DhcpProxyScriptFetcher.
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//
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// Note that while a request is in progress, the fetcher may be holding a
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// reference to |url_request_context|. Be careful not to create cycles
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// between the fetcher and the context; you can break such cycles by calling
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// Cancel().
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virtual std::unique_ptr<DhcpProxyScriptFetcher> Create(
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URLRequestContext* url_request_context);
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private:
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DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcherFactory);
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};
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} // namespace net
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#endif // NET_PROXY_DHCP_PROXY_SCRIPT_FETCHER_FACTORY_H_
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