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// Copyright (c) 2009 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.
#include "chrome/browser/diagnostics/sqlite_diagnostics.h"
#include "app/sql/connection.h"
#include "base/histogram.h"
#include "base/logging.h"
#include "base/singleton.h"
namespace {
const char* kHistogramNames[] = {
"Sqlite.Cookie.Error",
"Sqlite.History.Error",
"Sqlite.Thumbnail.Error",
"Sqlite.Text.Error",
"Sqlite.Web.Error"
};
// This class handles the exceptional sqlite errors that we might encounter
// if for example the db is corrupted. Right now we just generate a UMA
// histogram for release and an assert for debug builds.
//
// Why is it a template you ask? well, that is a funny story. The histograms
// need to be singletons that is why they are always static at the function
// scope, but we cannot use the Singleton class because they are not default
// constructible. The template parameter makes the compiler to create unique
// classes that don't share the same static variable.
template <size_t unique>
class BasicSqliteErrrorHandler : public sql::ErrorDelegate {
public:
virtual int OnError(int error, sql::Connection* connection,
sql::Statement* stmt) {
NOTREACHED() << "sqlite error " << error;
RecordErrorInHistogram(error);
return error;
}
private:
static void RecordErrorInHistogram(int error) {
// The histogram values from sqlite result codes go currently from 1 to
// 26 currently but 50 gives them room to grow.
static scoped_refptr<Histogram> histogram =
LinearHistogram::LinearHistogramFactoryGet(kHistogramNames[unique], 1,
50, 51);
histogram->SetFlags(kUmaTargetedHistogramFlag);
histogram->Add(error);
}
};
} // namespace
sql::ErrorDelegate* GetErrorHandlerForCookieDb() {
return new BasicSqliteErrrorHandler<0>();
}
sql::ErrorDelegate* GetErrorHandlerForHistoryDb() {
return new BasicSqliteErrrorHandler<1>();
}
sql::ErrorDelegate* GetErrorHandlerForThumbnailDb() {
return new BasicSqliteErrrorHandler<2>();
}
sql::ErrorDelegate* GetErrorHandlerForTextDb() {
return new BasicSqliteErrrorHandler<3>();
}
sql::ErrorDelegate* GetErrorHandlerForWebDb() {
return new BasicSqliteErrrorHandler<4>();
}
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