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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
#pragma once
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/time.h"
namespace net {
class URLRequestThrottlerHeaderInterface;
// Interface provided on entries of the URL request throttler manager.
class URLRequestThrottlerEntryInterface
: public base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface> {
public:
URLRequestThrottlerEntryInterface() {}
// Returns true when we have encountered server errors and are doing
// exponential back-off.
// URLRequestHttpJob checks this method prior to every request; it
// cancels requests if this method returns true.
virtual bool IsDuringExponentialBackoff() const = 0;
// Calculates a recommended sending time for the next request and reserves it.
// The sending time is not earlier than the current exponential back-off
// release time or |earliest_time|. Moreover, the previous results of
// the method are taken into account, in order to make sure they are spread
// properly over time.
// Returns the recommended delay before sending the next request, in
// milliseconds. The return value is always positive or 0.
// Although it is not mandatory, respecting the value returned by this method
// is helpful to avoid traffic overload.
virtual int64 ReserveSendingTimeForNextRequest(
const base::TimeTicks& earliest_time) = 0;
// Returns the time after which requests are allowed.
virtual base::TimeTicks GetExponentialBackoffReleaseTime() const = 0;
// This method needs to be called each time a response is received.
virtual void UpdateWithResponse(
const std::string& host,
const URLRequestThrottlerHeaderInterface* response) = 0;
// Lets higher-level modules, that know how to parse particular response
// bodies, notify of receiving malformed content for the given URL. This will
// be handled by the throttler as if an HTTP 5xx response had been received to
// the request, i.e. it will count as a failure.
virtual void ReceivedContentWasMalformed() = 0;
protected:
friend class base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface>;
virtual ~URLRequestThrottlerEntryInterface() {}
private:
friend class base::RefCounted<URLRequestThrottlerEntryInterface>;
DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntryInterface);
};
} // namespace net
#endif // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
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