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// Copyright 2018 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_BASE_VERSION_COMPATIBILITY_H_
#define COBALT_BASE_VERSION_COMPATIBILITY_H_
#if defined(COBALT_ENABLE_VERSION_COMPATIBILITY_VALIDATIONS)
#include <string>
#include "base/atomicops.h"
#include "base/basictypes.h"
#include "base/memory/singleton.h"
#include "cobalt/base/c_val.h"
namespace base {
// This thread-safe singleton class provides basic support for Cobalt version
// compatibility validations.
// NOTE: This class exists for convenience and can be removed when we create a
// better mechanism for dependency injection in Cobalt.
class VersionCompatibility {
public:
// Method to get the singleton instance of this class.
static VersionCompatibility* GetInstance();
void SetMinimumVersion(int minimum_version);
int GetMinimumVersion() const;
// Called when a version compatibility violation is encountered.
void ReportViolation(const std::string& violation_info);
private:
friend struct StaticMemorySingletonTraits<VersionCompatibility>;
VersionCompatibility();
~VersionCompatibility() = default;
// The number of violations that have been encountered.
base::CVal<int, base::CValDebug> violation_count;
// The minimum version of Cobalt to validate compatibility against.
base::subtle::Atomic32 minimum_version_;
DISALLOW_COPY_AND_ASSIGN(VersionCompatibility);
};
} // namespace base
#endif // defined(COBALT_ENABLE_VERSION_COMPATIBILITY_VALIDATIONS)
#endif // COBALT_BASE_VERSION_COMPATIBILITY_H_