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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_DELETION_HELPER_H_
#define COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_DELETION_HELPER_H_
#include <memory>
#include "base/callback_forward.h"
#include "base/message_loop/message_loop.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/disk_cache.h"
#include "url/gurl.h"
namespace disk_cache {
class Entry;
}
namespace browsing_data {
// Helper to remove http cache data from a StoragePartition.
class ConditionalCacheDeletionHelper {
public:
// Creates a helper to delete |cache| entries that match the |condition|.
// Must be created on the IO thread!
ConditionalCacheDeletionHelper(
disk_cache::Backend* cache,
const base::Callback<bool(const disk_cache::Entry*)>& condition);
// A convenience method to create a condition matching cache entries whose
// last modified time is between |begin_time| (inclusively), |end_time|
// (exclusively) and whose URL is matched by the |url_predicate|. Note that
// |begin_time| and |end_time| can be null to indicate unbounded time interval
// in their respective direction.
static base::Callback<bool(const disk_cache::Entry*)>
CreateURLAndTimeCondition(
const base::Callback<bool(const GURL&)>& url_predicate,
const base::Time& begin_time,
const base::Time& end_time);
// Deletes the cache entries according to the specified condition. Destroys
// this instance of ConditionalCacheDeletionHelper when finished.
// Must be called on the IO thread!
//
// The return value is a net error code. If this method returns
// ERR_IO_PENDING, the |completion_callback| will be invoked when the
// operation completes.
int DeleteAndDestroySelfWhenFinished(
const net::CompletionCallback& completion_callback);
private:
friend class base::DeleteHelper<ConditionalCacheDeletionHelper>;
~ConditionalCacheDeletionHelper();
void IterateOverEntries(int error);
disk_cache::Backend* cache_;
const base::Callback<bool(const disk_cache::Entry*)> condition_;
net::CompletionCallback completion_callback_;
std::unique_ptr<disk_cache::Backend::Iterator> iterator_;
disk_cache::Entry* current_entry_;
disk_cache::Entry* previous_entry_;
DISALLOW_COPY_AND_ASSIGN(ConditionalCacheDeletionHelper);
};
} // namespace browsing_data
#endif // COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_DELETION_HELPER_H_
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