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| 1 // Copyright (c) 2012 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 #include "net/dns/host_cache.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/metrics/field_trial.h" | |
| 9 #include "base/metrics/histogram.h" | |
| 10 #include "base/strings/string_number_conversions.h" | |
| 11 #include "net/base/net_errors.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 //----------------------------------------------------------------------------- | |
| 16 | |
| 17 HostCache::Entry::Entry(int error, const AddressList& addrlist, | |
| 18 base::TimeDelta ttl) | |
| 19 : error(error), | |
| 20 addrlist(addrlist), | |
| 21 ttl(ttl) { | |
| 22 DCHECK(ttl >= base::TimeDelta()); | |
| 23 } | |
| 24 | |
| 25 HostCache::Entry::Entry(int error, const AddressList& addrlist) | |
| 26 : error(error), | |
| 27 addrlist(addrlist), | |
| 28 ttl(base::TimeDelta::FromSeconds(-1)) { | |
| 29 } | |
| 30 | |
| 31 HostCache::Entry::~Entry() { | |
| 32 } | |
| 33 | |
| 34 //----------------------------------------------------------------------------- | |
| 35 | |
| 36 HostCache::HostCache(size_t max_entries) | |
| 37 : entries_(max_entries) { | |
| 38 } | |
| 39 | |
| 40 HostCache::~HostCache() { | |
| 41 } | |
| 42 | |
| 43 const HostCache::Entry* HostCache::Lookup(const Key& key, | |
| 44 base::TimeTicks now) { | |
| 45 DCHECK(CalledOnValidThread()); | |
| 46 if (caching_is_disabled()) | |
| 47 return NULL; | |
| 48 | |
| 49 return entries_.Get(key, now); | |
| 50 } | |
| 51 | |
| 52 void HostCache::Set(const Key& key, | |
| 53 const Entry& entry, | |
| 54 base::TimeTicks now, | |
| 55 base::TimeDelta ttl) { | |
| 56 DCHECK(CalledOnValidThread()); | |
| 57 if (caching_is_disabled()) | |
| 58 return; | |
| 59 | |
| 60 entries_.Put(key, entry, now, now + ttl); | |
| 61 } | |
| 62 | |
| 63 void HostCache::clear() { | |
| 64 DCHECK(CalledOnValidThread()); | |
| 65 entries_.Clear(); | |
| 66 } | |
| 67 | |
| 68 size_t HostCache::size() const { | |
| 69 DCHECK(CalledOnValidThread()); | |
| 70 return entries_.size(); | |
| 71 } | |
| 72 | |
| 73 size_t HostCache::max_entries() const { | |
| 74 DCHECK(CalledOnValidThread()); | |
| 75 return entries_.max_entries(); | |
| 76 } | |
| 77 | |
| 78 // Note that this map may contain expired entries. | |
| 79 const HostCache::EntryMap& HostCache::entries() const { | |
| 80 DCHECK(CalledOnValidThread()); | |
| 81 return entries_; | |
| 82 } | |
| 83 | |
| 84 // static | |
| 85 scoped_ptr<HostCache> HostCache::CreateDefaultCache() { | |
| 86 // Cache capacity is determined by the field trial. | |
| 87 #if defined(ENABLE_BUILT_IN_DNS) | |
| 88 const size_t kDefaultMaxEntries = 1000; | |
| 89 #else | |
| 90 const size_t kDefaultMaxEntries = 100; | |
| 91 #endif | |
| 92 const size_t kSaneMaxEntries = 1 << 20; | |
| 93 size_t max_entries = 0; | |
| 94 base::StringToSizeT(base::FieldTrialList::FindFullName("HostCacheSize"), | |
| 95 &max_entries); | |
| 96 if ((max_entries == 0) || (max_entries > kSaneMaxEntries)) | |
| 97 max_entries = kDefaultMaxEntries; | |
| 98 return make_scoped_ptr(new HostCache(max_entries)); | |
| 99 } | |
| 100 | |
| 101 void HostCache::EvictionHandler::Handle( | |
| 102 const Key& key, | |
| 103 const Entry& entry, | |
| 104 const base::TimeTicks& expiration, | |
| 105 const base::TimeTicks& now, | |
| 106 bool on_get) const { | |
| 107 if (on_get) { | |
| 108 DCHECK(now >= expiration); | |
| 109 UMA_HISTOGRAM_CUSTOM_TIMES("DNS.CacheExpiredOnGet", now - expiration, | |
| 110 base::TimeDelta::FromSeconds(1), base::TimeDelta::FromDays(1), 100); | |
| 111 return; | |
| 112 } | |
| 113 if (expiration > now) { | |
| 114 UMA_HISTOGRAM_CUSTOM_TIMES("DNS.CacheEvicted", expiration - now, | |
| 115 base::TimeDelta::FromSeconds(1), base::TimeDelta::FromDays(1), 100); | |
| 116 } else { | |
| 117 UMA_HISTOGRAM_CUSTOM_TIMES("DNS.CacheExpired", now - expiration, | |
| 118 base::TimeDelta::FromSeconds(1), base::TimeDelta::FromDays(1), 100); | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 } // namespace net | |
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Chromium Code Reviews
Issue 992733002:
Remove //net (except for Android test stuff) and sdch (Closed)
Base URL: git@github.com:domokit/mojo.git@master