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72 lines
2.8 KiB
C++
72 lines
2.8 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_THROTTLER_ENTRY_INTERFACE_H_
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#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
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#include <stdint.h>
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#include <string>
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/time/time.h"
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#include "net/base/net_export.h"
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namespace net {
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class URLRequest;
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// Interface provided on entries of the URL request throttler manager.
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class NET_EXPORT URLRequestThrottlerEntryInterface
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: public base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface> {
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public:
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URLRequestThrottlerEntryInterface() {}
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// Returns true when we have encountered server errors and are doing
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// exponential back-off, unless the request has load flags that mean
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// it is likely to be user-initiated.
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//
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// URLRequestHttpJob checks this method prior to every request; it
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// cancels requests if this method returns true.
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virtual bool ShouldRejectRequest(const URLRequest& request) const = 0;
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// Calculates a recommended sending time for the next request and reserves it.
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// The sending time is not earlier than the current exponential back-off
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// release time or |earliest_time|. Moreover, the previous results of
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// the method are taken into account, in order to make sure they are spread
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// properly over time.
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// Returns the recommended delay before sending the next request, in
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// milliseconds. The return value is always positive or 0.
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// Although it is not mandatory, respecting the value returned by this method
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// is helpful to avoid traffic overload.
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virtual int64_t ReserveSendingTimeForNextRequest(
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const base::TimeTicks& earliest_time) = 0;
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// Returns the time after which requests are allowed.
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virtual base::TimeTicks GetExponentialBackoffReleaseTime() const = 0;
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// This method needs to be called each time a response is received.
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virtual void UpdateWithResponse(int status_code) = 0;
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// Lets higher-level modules, that know how to parse particular response
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// bodies, notify of receiving malformed content for the given URL. This will
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// be handled by the throttler as if an HTTP 503 response had been received to
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// the request, i.e. it will count as a failure, unless the HTTP response code
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// indicated is already one of those that will be counted as an error.
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virtual void ReceivedContentWasMalformed(int response_code) = 0;
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protected:
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friend class base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface>;
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virtual ~URLRequestThrottlerEntryInterface() {}
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private:
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friend class base::RefCounted<URLRequestThrottlerEntryInterface>;
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DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntryInterface);
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};
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} // namespace net
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#endif // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
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