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// Copyright 2016 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_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_
#define COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_
#include <memory>
#include "base/callback_forward.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/disk_cache.h"
namespace content {
class StoragePartition;
}
namespace net {
class URLRequestContextGetter;
}
namespace browsing_data {
// Helper to count the size of the http cache data from a StoragePartition.
class ConditionalCacheCountingHelper {
public:
// Returns the number bytes in the selected range and if this value is an
// upper estimate.
typedef base::Callback<void(int64_t, bool)> CacheCountCallback;
static ConditionalCacheCountingHelper* CreateForRange(
content::StoragePartition* storage_partition,
base::Time begin_time,
base::Time end_time);
// Count the cache entries according to the specified time range. Destroys
// this instance of ConditionalCacheCountingHelper when finished.
// Must be called on the UI thread!
//
// The |completion_callback| will be invoked when the operation completes.
base::WeakPtr<ConditionalCacheCountingHelper> CountAndDestroySelfWhenFinished(
const CacheCountCallback& result_callback);
bool IsFinished();
private:
enum class CacheState {
NONE,
CREATE_MAIN,
CREATE_MEDIA,
COUNT_MAIN,
COUNT_MEDIA,
DONE
};
friend class base::DeleteHelper<ConditionalCacheCountingHelper>;
ConditionalCacheCountingHelper(
base::Time begin_time,
base::Time end_time,
net::URLRequestContextGetter* main_context_getter,
net::URLRequestContextGetter* media_context_getter);
~ConditionalCacheCountingHelper();
void Finished();
void CountHttpCacheOnIOThread();
void DoCountCache(int rv);
// Stores the cache size computation result before it can be returned
// via a callback. This is either the sum of size of the the two cache
// backends, or an error code if the calculation failed.
int64_t calculation_result_;
bool is_upper_limit_;
CacheCountCallback result_callback_;
const base::Time begin_time_;
const base::Time end_time_;
bool is_finished_;
const scoped_refptr<net::URLRequestContextGetter> main_context_getter_;
const scoped_refptr<net::URLRequestContextGetter> media_context_getter_;
CacheState next_cache_state_;
disk_cache::Backend* cache_;
std::unique_ptr<disk_cache::Backend::Iterator> iterator_;
base::WeakPtrFactory<ConditionalCacheCountingHelper> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ConditionalCacheCountingHelper);
};
} // namespace browsing_data
#endif // COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_
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