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93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
// 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_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_
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#define NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_
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#include <string>
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#include "base/macros.h"
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#include "base/threading/thread_checker.h"
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#include "net/base/net_export.h"
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#include "net/url_request/url_request.h"
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namespace base {
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template <typename T> struct DefaultSingletonTraits;
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} // namespace base
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namespace net {
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// This class is responsible for managing the set of protocol factories and
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// request interceptors that determine how an URLRequestJob gets created to
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// handle an URLRequest.
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//
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// MULTI-THREADING NOTICE:
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// URLRequest is designed to have all consumers on a single thread, and
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// so no attempt is made to support Interceptor instances being
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// registered/unregistered or in any way poked on multiple threads.
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class NET_EXPORT URLRequestJobManager {
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public:
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// Returns the singleton instance.
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static URLRequestJobManager* GetInstance();
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// Instantiate an URLRequestJob implementation based on the registered
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// interceptors and protocol factories. This will always succeed in
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// returning a job unless we are--in the extreme case--out of memory.
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URLRequestJob* CreateJob(URLRequest* request,
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NetworkDelegate* network_delegate) const;
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// Allows interceptors to hijack the request after examining the new location
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// of a redirect. Returns NULL if no interceptor intervenes.
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URLRequestJob* MaybeInterceptRedirect(URLRequest* request,
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NetworkDelegate* network_delegate,
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const GURL& location) const;
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// Allows interceptors to hijack the request after examining the response
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// status and headers. This is also called when there is no server response
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// at all to allow interception of failed requests due to network errors.
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// Returns NULL if no interceptor intervenes.
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URLRequestJob* MaybeInterceptResponse(
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URLRequest* request, NetworkDelegate* network_delegate) const;
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// Returns true if the manager has a built-in handler for |scheme|.
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static bool SupportsScheme(const std::string& scheme);
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private:
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friend struct base::DefaultSingletonTraits<URLRequestJobManager>;
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URLRequestJobManager();
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~URLRequestJobManager();
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// The first call to this function sets the allowed thread. This way we avoid
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// needing to define that thread externally. Since we expect all callers to
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// be on the same thread, we don't worry about threads racing to set the
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// allowed thread.
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bool IsAllowedThread() const {
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#if 0
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return thread_checker_.CalledOnValidThread();
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}
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// We use this to assert that CreateJob and the registration functions all
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// run on the same thread.
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base::ThreadChecker thread_checker_;
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#else
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// The previous version of this check used GetCurrentThread on Windows to
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// get thread handles to compare. Unfortunately, GetCurrentThread returns
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// a constant pseudo-handle (0xFFFFFFFE), and therefore IsAllowedThread
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// always returned true. The above code that's turned off is the correct
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// code, but causes the tree to turn red because some caller isn't
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// respecting our thread requirements. We're turning off the check for now;
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// bug http://b/issue?id=1338969 has been filed to fix things and turn the
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// check back on.
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return true;
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}
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#endif
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DISALLOW_COPY_AND_ASSIGN(URLRequestJobManager);
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};
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} // namespace net
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#endif // NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_
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