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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__
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