resource_cache_limit_calculator.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_COMMON_RESOURCE_CACHE_LIMIT_CALCULATOR_H_
#define FLUTTER_SHELL_COMMON_RESOURCE_CACHE_LIMIT_CALCULATOR_H_
 
#include <cstdint>
#include <unordered_map>
 
#include "flutter/fml/macros.h"
#include "flutter/fml/memory/weak_ptr.h"
 
namespace flutter {
class ResourceCacheLimitItem {
 public:
  // The expected GPU resource cache limit in bytes. This will be called on the
  // platform thread.
  virtual size_t GetResourceCacheLimit() = 0;
 
 protected:
  virtual ~ResourceCacheLimitItem() = default;
};
 
class ResourceCacheLimitCalculator {
 public:
  explicit ResourceCacheLimitCalculator(size_t max_bytes_threshold)
      : max_bytes_threshold_(max_bytes_threshold) {}
 
  ~ResourceCacheLimitCalculator() = default;
 
  // This will be called on the platform thread.
  void AddResourceCacheLimitItem(
      const fml::WeakPtr<ResourceCacheLimitItem>& item) {
    items_.push_back(item);
  }
 
  // The maximum GPU resource cache limit in bytes calculated by
  // 'ResourceCacheLimitItem's. This will be called on the platform thread.
  size_t GetResourceCacheMaxBytes();
 
 private:
  std::vector<fml::WeakPtr<ResourceCacheLimitItem>> items_;
  size_t max_bytes_threshold_;
  FML_DISALLOW_COPY_AND_ASSIGN(ResourceCacheLimitCalculator);
};
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_COMMON_RESOURCE_CACHE_LIMIT_CALCULATOR_H_