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// Copyright 2014 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 COMPONENTS_MACHINE_INTELLIGENCE_RANKER_URL_FETCHER_H_
#define COMPONENTS_MACHINE_INTELLIGENCE_RANKER_URL_FETCHER_H_
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_context_getter.h"
#include "url/gurl.h"
namespace machine_intelligence {
// Downloads Ranker models.
class RankerURLFetcher : public net::URLFetcherDelegate {
public:
// Callback type for Request().
typedef base::Callback<void(bool, const std::string&)> Callback;
// Represents internal state if the fetch is completed successfully.
enum State {
IDLE, // No fetch request was issued.
REQUESTING, // A fetch request was issued, but not finished yet.
COMPLETED, // The last fetch request was finished successfully.
FAILED, // The last fetch request was finished with a failure.
};
RankerURLFetcher();
~RankerURLFetcher() override;
int max_retry_on_5xx() { return max_retry_on_5xx_; }
void set_max_retry_on_5xx(int count) { max_retry_on_5xx_ = count; }
// Requests to |url|. |callback| will be invoked when the function returns
// true, and the request is finished asynchronously.
// Returns false if the previous request is not finished, or the request
// is omitted due to retry limitation.
bool Request(const GURL& url,
const Callback& callback,
net::URLRequestContextGetter* request_context);
// Gets internal state.
State state() { return state_; }
// net::URLFetcherDelegate implementation:
void OnURLFetchComplete(const net::URLFetcher* source) override;
private:
// URL to send the request.
GURL url_;
// Internal state.
enum State state_;
// URLFetcher instance.
std::unique_ptr<net::URLFetcher> fetcher_;
// Callback passed at Request(). It will be invoked when an asynchronous
// fetch operation is finished.
Callback callback_;
// Counts how many times did it try to fetch the language list.
int retry_count_;
// Max number how many times to retry on the server error
int max_retry_on_5xx_;
DISALLOW_COPY_AND_ASSIGN(RankerURLFetcher);
};
} // namespace machine_intelligence
#endif // COMPONENTS_MACHINE_INTELLIGENCE_RANKER_URL_FETCHER_H_
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