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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__
+#define NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__
+
+#include <map>
+
+#include "base/lock.h"
+#include "net/url_request/url_request.h"
+
+// This class is responsible for managing the set of protocol factories and
+// request interceptors that determine how an URLRequestJob gets created to
+// handle an URLRequest.
+//
+// MULTI-THREADING NOTICE:
+//   URLRequest is designed to have all consumers on a single thread, and so no
+//   attempt is made to support ProtocolFactory or Interceptor instances being
+//   registered/unregistered or in any way poked on multiple threads.  However,
+//   we do support checking for supported schemes FROM ANY THREAD (i.e., it is
+//   safe to call SupportsScheme on any thread).
+//
+class URLRequestJobManager {
+ public:
+  URLRequestJobManager();
+
+  // Instantiate an URLRequestJob implementation based on the registered
+  // interceptors and protocol factories.  This will always succeed in
+  // returning a job unless we are--in the extreme case--out of memory.
+  URLRequestJob* CreateJob(URLRequest* request) const;
+
+  // Returns true if there is a protocol factory registered for the given
+  // scheme.  Note: also returns true if there is a built-in handler for the
+  // given scheme.
+  bool SupportsScheme(const std::string& scheme) const;
+
+  // Register a protocol factory associated with the given scheme.  The factory
+  // parameter may be null to clear any existing association.  Returns the
+  // previously registered protocol factory if any.
+  URLRequest::ProtocolFactory* RegisterProtocolFactory(
+      const std::string& scheme, URLRequest::ProtocolFactory* factory);
+
+  // Register/unregister a request interceptor.
+  void RegisterRequestInterceptor(URLRequest::Interceptor* interceptor);
+  void UnregisterRequestInterceptor(URLRequest::Interceptor* interceptor);
+
+ private:
+  typedef std::map<std::string,URLRequest::ProtocolFactory*> FactoryMap;
+  typedef std::vector<URLRequest::Interceptor*> InterceptorList;
+
+  mutable Lock lock_;
+  FactoryMap factories_;
+  InterceptorList interceptors_;
+
+#ifndef NDEBUG
+  // We use this to assert that CreateJob and the registration functions all
+  // run on the same thread.
+  mutable HANDLE allowed_thread_;
+
+  // The first guy to call this function sets the allowed thread.  This way we
+  // avoid needing to define that thread externally.  Since we expect all
+  // callers to be on the same thread, we don't worry about threads racing to
+  // set the allowed thread.
+  bool IsAllowedThread() const {
+    if (!allowed_thread_)
+      allowed_thread_ = GetCurrentThread();
+    return allowed_thread_ == GetCurrentThread();
+  }
+#endif
+
+  DISALLOW_EVIL_CONSTRUCTORS(URLRequestJobManager);
+};
+
+#endif  // NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__