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// Copyright (c) 2013 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.
//
// An object to record and send user feedback to spelling service. The spelling
// service uses the feedback to improve its suggestions.
//
// Assigns uint32 hash identifiers to spelling suggestions from spelling service
// and stores these suggestions. Records user's actions on these suggestions.
// Periodically sends batches of user feedback to the spelling service.
#ifndef CHROME_BROWSER_SPELLCHECKER_FEEDBACK_SENDER_H_
#define CHROME_BROWSER_SPELLCHECKER_FEEDBACK_SENDER_H_
#include <map>
#include <set>
#include <vector>
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "base/timer/timer.h"
#include "chrome/browser/spellchecker/feedback.h"
#include "chrome/browser/spellchecker/misspelling.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
class SpellCheckMarker;
struct SpellCheckResult;
namespace net {
class URLFetcher;
class URLRequestContextGetter;
}
namespace spellcheck {
namespace {
// Constants for the feedback field trial.
const char kFeedbackFieldTrialName[] = "SpellingServiceFeedback";
const char kFeedbackFieldTrialEnabledGroupName[] = "Enabled";
} // namespace
// Stores and sends user feedback to the spelling service. Sample usage:
// FeedbackSender sender(profile.GetRequestContext(), language, country);
// sender.OnSpellcheckResults(spellcheck_results_from_spelling_service,
// renderer_process_id,
// spellchecked_text,
// existing_hashes);
// sender.SelectedSuggestion(hash, suggestion_index);
class FeedbackSender : public base::SupportsWeakPtr<FeedbackSender>,
public net::URLFetcherDelegate {
public:
// Constructs a feedback sender. Keeps |request_context| in a scoped_refptr,
// because URLRequestContextGetter implements RefcountedThreadSafe.
FeedbackSender(net::URLRequestContextGetter* request_context,
const std::string& language,
const std::string& country);
virtual ~FeedbackSender();
// Records that user selected suggestion |suggestion_index| for the
// misspelling identified by |hash|.
void SelectedSuggestion(uint32 hash, int suggestion_index);
// Records that user added the misspelling identified by |hash| to the
// dictionary.
void AddedToDictionary(uint32 hash);
// Records that user right-clicked on the misspelling identified by |hash|,
// but did not select any suggestion.
void IgnoredSuggestions(uint32 hash);
// Records that user did not choose any suggestion but manually corrected the
// misspelling identified by |hash| to string |correction|, which is not in
// the list of suggestions.
void ManuallyCorrected(uint32 hash, const base::string16& correction);
// Records that user has the misspelling in the custom dictionary. The user
// will never see the spellcheck suggestions for the misspelling.
void RecordInDictionary(uint32 hash);
// Receives document markers for renderer with process ID |render_process_id|
// when the renderer responds to a RequestDocumentMarkers() call. Finalizes
// feedback for the markers that are gone from the renderer. Sends feedback
// data for the renderer with process ID |renderer_process_id| to the spelling
// service. If the current session has expired, then refreshes the session
// start timestamp and sends out all of the feedback data.
void OnReceiveDocumentMarkers(int renderer_process_id,
const std::vector<uint32>& markers);
// Generates feedback data based on spellcheck results. The new feedback data
// is pending. Sets hash identifiers for |results|. Called when spelling
// service client receives results from the spelling service. Does not take
// ownership of |results|.
void OnSpellcheckResults(int renderer_process_id,
const base::string16& text,
const std::vector<SpellCheckMarker>& markers,
std::vector<SpellCheckResult>* results);
// Receives updated language and country code for feedback. Finalizes and
// sends out all of the feedback data.
void OnLanguageCountryChange(const std::string& language,
const std::string& country);
// Starts collecting feedback, if it's not already being collected.
void StartFeedbackCollection();
// Sends out all previously collected data and stops collecting feedback, if
// it was being collected.
void StopFeedbackCollection();
private:
friend class FeedbackSenderTest;
// net::URLFetcherDelegate implementation. Takes ownership of |source|.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
// Requests the document markers from all of the renderers to determine which
// feedback can be finalized. Finalizes feedback for renderers that are gone.
// Called periodically when |timer_| fires.
void RequestDocumentMarkers();
// Sends out all feedback data. Resets the session-start timestamp to now.
// Restarts the timer that requests markers from the renderers.
void FlushFeedback();
// Sends out the |feedback_data|.
void SendFeedback(const std::vector<Misspelling>& feedback_data,
bool is_first_feedback_batch);
// URL request context for the feedback senders.
scoped_refptr<net::URLRequestContextGetter> request_context_;
// The feedback API version.
const std::string api_version_;
// The language of text. The string is a BCP 47 language tag.
std::string language_;
// The country of origin. The string is the ISO 3166-1 alpha-3 code.
std::string country_;
// Misspelling counter used to generate unique hash identifier for each
// misspelling.
size_t misspelling_counter_;
// Feedback data.
Feedback feedback_;
// A set of renderer process IDs for renderers that have sent out feedback in
// this session.
std::set<int> renderers_sent_feedback_;
// When the session started.
base::Time session_start_;
// The URL where the feedback data should be sent.
GURL feedback_service_url_;
// A timer to periodically request a list of document spelling markers from
// all of the renderers. The timer starts in StartFeedbackCollection() and
// stops in StopFeedbackCollection(). The timer stops and abandons its tasks
// on destruction.
base::RepeatingTimer<FeedbackSender> timer_;
// Feedback senders that need to stay alive for the duration of sending data.
// If a sender is destroyed before it finishes, then sending feedback will be
// canceled.
ScopedVector<net::URLFetcher> senders_;
DISALLOW_COPY_AND_ASSIGN(FeedbackSender);
};
} // namespace spellcheck
#endif // CHROME_BROWSER_SPELLCHECKER_FEEDBACK_SENDER_H_
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