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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_CRONET_HOST_CACHE_PERSISTENCE_MANAGER_H_ | |
6 #define COMPONENTS_CRONET_HOST_CACHE_PERSISTENCE_MANAGER_H_ | |
7 | |
8 #include <memory> | |
9 #include <string> | |
10 | |
11 #include "base/macros.h" | |
12 #include "base/memory/weak_ptr.h" | |
13 #include "base/sequence_checker.h" | |
14 #include "base/time/time.h" | |
15 #include "base/timer/timer.h" | |
16 #include "components/prefs/pref_change_registrar.h" | |
17 #include "net/dns/host_cache.h" | |
18 | |
19 class PrefService; | |
20 | |
21 namespace cronet { | |
22 // Handles the interaction between HostCache and prefs for persistence. | |
23 // On write, starts a timer, or ignores if the timer is already running. When | |
pauljensen
2017/06/23 14:10:31
I'm a little confused by "On write", perhaps "Upon
mgersh
2017/06/23 16:02:06
Done.
| |
24 // that timer expires, writes the current state of the HostCache to prefs. | |
25 // | |
26 // Can be used with synchronous or asynchronous prefs loading. Not appropriate | |
27 // for use outside of Cronet because its network and prefs operations run on | |
28 // the same sequence. Must be created after and destroyed before the HostCache | |
29 // and PrefService. | |
30 class HostCachePersistenceManager : public net::HostCache::PersistenceDelegate { | |
31 public: | |
32 // |cache| is the HostCache whose contents will be persisted. It must be | |
33 // non-null and must outlive the HostCachePersistenceManager. | |
34 // |pref_service| is the PrefService that will be used to persist the cache | |
35 // contents. It must outlive the HostCachePersistenceManager. | |
36 // |pref_name| is the name of the pref to read and write. | |
37 // |delay| is the maximum time between a change in the cache and writing that | |
38 // change to prefs. | |
39 HostCachePersistenceManager(net::HostCache* cache, | |
40 PrefService* pref_service, | |
41 std::string pref_name, | |
42 base::TimeDelta delay); | |
43 ~HostCachePersistenceManager(); | |
pauljensen
2017/06/23 14:10:31
should be virtual.
"If your class has virtual meth
mgersh
2017/06/23 16:02:06
Done.
| |
44 | |
45 // HostCache::PersistenceDelegate implementation | |
pauljensen
2017/06/23 14:10:31
nit: add "net::"
mgersh
2017/06/23 16:02:06
Done.
| |
46 void ScheduleWrite() override; | |
47 | |
48 private: | |
49 // Gets the serialized HostCache and writes it to prefs. | |
50 void WriteToDisk(); | |
51 // On initial prefs read, passes the serialized entries to the HostCache. | |
52 void ReadFromDisk(); | |
53 | |
54 net::HostCache* const cache_; | |
55 | |
56 PrefChangeRegistrar registrar_; | |
57 PrefService* const pref_service_; | |
58 const std::string pref_name_; | |
59 bool writing_pref_; | |
60 | |
61 const base::TimeDelta delay_; | |
62 base::OneShotTimer timer_; | |
63 | |
64 SEQUENCE_CHECKER(sequence_checker_); | |
65 base::WeakPtrFactory<HostCachePersistenceManager> weak_factory_; | |
66 | |
67 DISALLOW_COPY_AND_ASSIGN(HostCachePersistenceManager); | |
68 }; | |
69 | |
70 } // namespace cronet | |
71 | |
72 #endif // COMPONENTS_CRONET_HOST_CACHE_PERSISTENCE_MANAGER_H_ | |
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