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content / browser / cache_storage / scoped_writable_entry.h [blame]
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_CACHE_STORAGE_SCOPED_WRITABLE_ENTRY_H_
#define CONTENT_BROWSER_CACHE_STORAGE_SCOPED_WRITABLE_ENTRY_H_
#include <memory>
#include "net/disk_cache/disk_cache.h"
namespace content {
// A custom deleter that closes the entry. But if WritingCompleted() hasn't been
// called, it will doom the entry before closing it.
class ScopedWritableDeleter {
public:
ScopedWritableDeleter() = default;
ScopedWritableDeleter(ScopedWritableDeleter&& other) = default;
ScopedWritableDeleter& operator=(ScopedWritableDeleter&& other) = default;
void operator()(disk_cache::Entry* entry) {
if (!completed_)
entry->Doom();
// |entry| is owned by the backend, we just need to close it as it's
// ref-counted.
entry->Close();
}
void WritingCompleted() { completed_ = true; }
private:
bool completed_ = false;
};
// Use this to manage disk_cache::Entry*'s that should be doomed before closing
// unless told otherwise (via calling WritingCompleted on the deleter).
//
// Example:
// ScopedWritableEntry entry(my_entry);
// .. write some stuff ..
// entry.get_deleter().WritingCompleted();
typedef std::unique_ptr<disk_cache::Entry, ScopedWritableDeleter>
ScopedWritableEntry;
} // namespace content
#endif // CONTENT_BROWSER_CACHE_STORAGE_SCOPED_WRITABLE_ENTRY_H_