59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
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// Copyright 2023 The Chromium Authors
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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_BASE_ADDRESS_MAP_CACHE_LINUX_H_
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#define NET_BASE_ADDRESS_MAP_CACHE_LINUX_H_
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#include <map>
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#include <string>
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#include <unordered_set>
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#include "base/synchronization/lock.h"
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#include "base/thread_annotations.h"
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#include "net/base/address_map_linux.h"
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#include "net/base/net_export.h"
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namespace net {
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// This caches AddressMap and the set of online links (see AddressMapOwnerLinux)
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// so AddressTrackerLinux doesn't need to always be running in every process.
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// This class is thread-safe.
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class NET_EXPORT AddressMapCacheLinux : public AddressMapOwnerLinux {
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public:
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AddressMapCacheLinux();
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AddressMapCacheLinux(const AddressMapCacheLinux&) = delete;
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AddressMapCacheLinux& operator=(const AddressMapCacheLinux&) = delete;
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~AddressMapCacheLinux() override;
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// AddressMapOwnerLinux implementation:
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AddressMap GetAddressMap() const override;
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std::unordered_set<int> GetOnlineLinks() const override;
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AddressMapCacheLinux* GetAddressMapCacheLinux() override;
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// Sets `cached_address_map_` and `cached_online_links_`. This should normally
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// only be used to set the initial AddressMap and set of online links.
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void SetCachedInfo(AddressMap address_map,
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std::unordered_set<int> online_links);
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// Takes the diffs and applies them (atomically) to `cached_address_map_` and
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// `cached_online_links_`.
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// Once this method returns, calls on other threads to GetAddressMap() and
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// GetOnlineLinks() that happen-after this call should return the updated
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// data.
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void ApplyDiffs(const AddressMapDiff& addr_diff,
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const OnlineLinksDiff& links_diff);
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private:
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mutable base::Lock lock_;
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AddressMap cached_address_map_ GUARDED_BY(lock_);
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std::unordered_set<int> cached_online_links_ GUARDED_BY(lock_);
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};
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} // namespace net
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#endif // NET_BASE_ADDRESS_MAP_CACHE_LINUX_H_
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