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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_ | |
| 6 #define NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/threading/thread_checker.h" | |
| 11 #include "net/base/net_export.h" | |
| 12 #include "net/url_request/url_request.h" | |
| 13 | |
| 14 template <typename T> struct DefaultSingletonTraits; | |
| 15 | |
| 16 namespace net { | |
| 17 | |
| 18 // This class is responsible for managing the set of protocol factories and | |
| 19 // request interceptors that determine how an URLRequestJob gets created to | |
| 20 // handle an URLRequest. | |
| 21 // | |
| 22 // MULTI-THREADING NOTICE: | |
| 23 // URLRequest is designed to have all consumers on a single thread, and | |
| 24 // so no attempt is made to support Interceptor instances being | |
| 25 // registered/unregistered or in any way poked on multiple threads. | |
| 26 class NET_EXPORT URLRequestJobManager { | |
| 27 public: | |
| 28 // Returns the singleton instance. | |
| 29 static URLRequestJobManager* GetInstance(); | |
| 30 | |
| 31 // Instantiate an URLRequestJob implementation based on the registered | |
| 32 // interceptors and protocol factories. This will always succeed in | |
| 33 // returning a job unless we are--in the extreme case--out of memory. | |
| 34 URLRequestJob* CreateJob(URLRequest* request, | |
| 35 NetworkDelegate* network_delegate) const; | |
| 36 | |
| 37 // Allows interceptors to hijack the request after examining the new location | |
| 38 // of a redirect. Returns NULL if no interceptor intervenes. | |
| 39 URLRequestJob* MaybeInterceptRedirect(URLRequest* request, | |
| 40 NetworkDelegate* network_delegate, | |
| 41 const GURL& location) const; | |
| 42 | |
| 43 // Allows interceptors to hijack the request after examining the response | |
| 44 // status and headers. This is also called when there is no server response | |
| 45 // at all to allow interception of failed requests due to network errors. | |
| 46 // Returns NULL if no interceptor intervenes. | |
| 47 URLRequestJob* MaybeInterceptResponse( | |
| 48 URLRequest* request, NetworkDelegate* network_delegate) const; | |
| 49 | |
| 50 // Returns true if the manager has a built-in handler for |scheme|. | |
| 51 static bool SupportsScheme(const std::string& scheme); | |
| 52 | |
| 53 private: | |
| 54 friend struct DefaultSingletonTraits<URLRequestJobManager>; | |
| 55 | |
| 56 URLRequestJobManager(); | |
| 57 ~URLRequestJobManager(); | |
| 58 | |
| 59 // The first guy to call this function sets the allowed thread. This way we | |
| 60 // avoid needing to define that thread externally. Since we expect all | |
| 61 // callers to be on the same thread, we don't worry about threads racing to | |
| 62 // set the allowed thread. | |
| 63 bool IsAllowedThread() const { | |
| 64 #if 0 | |
| 65 return thread_checker_.CalledOnValidThread(); | |
| 66 } | |
| 67 | |
| 68 // We use this to assert that CreateJob and the registration functions all | |
| 69 // run on the same thread. | |
| 70 base::ThreadChecker thread_checker_; | |
| 71 #else | |
| 72 // The previous version of this check used GetCurrentThread on Windows to | |
| 73 // get thread handles to compare. Unfortunately, GetCurrentThread returns | |
| 74 // a constant pseudo-handle (0xFFFFFFFE), and therefore IsAllowedThread | |
| 75 // always returned true. The above code that's turned off is the correct | |
| 76 // code, but causes the tree to turn red because some caller isn't | |
| 77 // respecting our thread requirements. We're turning off the check for now; | |
| 78 // bug http://b/issue?id=1338969 has been filed to fix things and turn the | |
| 79 // check back on. | |
| 80 return true; | |
| 81 } | |
| 82 #endif | |
| 83 | |
| 84 DISALLOW_COPY_AND_ASSIGN(URLRequestJobManager); | |
| 85 }; | |
| 86 | |
| 87 } // namespace net | |
| 88 | |
| 89 #endif // NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H_ | |
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