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70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
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// Copyright (c) 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_BACKEND_CLEANUP_TRACKER_H_
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#define NET_DISK_CACHE_BACKEND_CLEANUP_TRACKER_H_
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#include <utility>
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#include <vector>
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#include "base/callback.h"
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#include "base/files/file_path.h"
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#include "base/memory/ref_counted.h"
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#include "base/sequence_checker.h"
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#include "net/base/net_export.h"
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namespace base {
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class SequencedTaskRunner;
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} // namespace base
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namespace disk_cache {
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// Internal helper used to sequence cleanup and reuse of cache directories.
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// One of these is created before each backend, and is kept alive till both
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// the backend is destroyed and all of its work is done by its refcount,
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// which keeps track of outstanding work. That refcount is expected to only be
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// updated from the I/O thread or its equivalent.
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class NET_EXPORT_PRIVATE BackendCleanupTracker
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: public base::RefCounted<BackendCleanupTracker> {
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public:
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// Either returns a fresh cleanup tracker for |path| if none exists, or
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// will eventually post |retry_closure| to the calling thread,
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// and return null.
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static scoped_refptr<BackendCleanupTracker> TryCreate(
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const base::FilePath& path,
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base::OnceClosure retry_closure);
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// Register a callback to be posted after all the work of associated
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// context is complete (which will result in destruction of this context).
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// Should only be called by owner, on its I/O-thread-like execution context,
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// and will in turn eventually post |cb| there.
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void AddPostCleanupCallback(base::OnceClosure cb);
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private:
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friend class base::RefCounted<BackendCleanupTracker>;
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explicit BackendCleanupTracker(const base::FilePath& path);
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~BackendCleanupTracker();
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void AddPostCleanupCallbackImpl(base::OnceClosure cb);
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base::FilePath path_;
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// Since it's possible that a different thread may want to create a
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// cache for a reused path, we keep track of runners contexts of
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// post-cleanup callbacks.
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std::vector<
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std::pair<scoped_refptr<base::SequencedTaskRunner>, base::OnceClosure>>
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post_cleanup_cbs_;
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// We expect only TryMakeContext to be multithreaded, everything
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// else should be sequenced.
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SEQUENCE_CHECKER(seq_checker_);
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DISALLOW_COPY_AND_ASSIGN(BackendCleanupTracker);
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_BACKEND_CLEANUP_TRACKER_H_
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