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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "net/dns/host_resolver.h" | 5 #include "net/dns/host_resolver.h" |
| 6 | 6 |
| 7 #include "base/logging.h" | 7 #include "base/logging.h" |
| 8 #include "base/metrics/field_trial.h" | 8 #include "base/metrics/field_trial.h" |
| 9 #include "base/strings/string_number_conversions.h" | 9 #include "base/strings/string_number_conversions.h" |
| 10 #include "base/strings/string_split.h" | 10 #include "base/strings/string_split.h" |
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| 30 options.max_concurrent_resolves); | 30 options.max_concurrent_resolves); |
| 31 | 31 |
| 32 // If not using default, do not use the field trial. | 32 // If not using default, do not use the field trial. |
| 33 if (limits.total_jobs != HostResolver::kDefaultParallelism) | 33 if (limits.total_jobs != HostResolver::kDefaultParallelism) |
| 34 return limits; | 34 return limits; |
| 35 | 35 |
| 36 // Default, without trial is no reserved slots. | 36 // Default, without trial is no reserved slots. |
| 37 limits.total_jobs = kDefaultMaxProcTasks; | 37 limits.total_jobs = kDefaultMaxProcTasks; |
| 38 | 38 |
| 39 // Parallelism is determined by the field trial. | 39 // Parallelism is determined by the field trial. |
| 40 std::string group = base::FieldTrialList::FindFullName( | 40 std::string group = |
| 41 "HostResolverDispatch"); | 41 base::FieldTrialList::FindFullName("HostResolverDispatch"); |
| 42 | 42 |
| 43 if (group.empty()) | 43 if (group.empty()) |
| 44 return limits; | 44 return limits; |
| 45 | 45 |
| 46 // The format of the group name is a list of non-negative integers separated | 46 // The format of the group name is a list of non-negative integers separated |
| 47 // by ':'. Each of the elements in the list corresponds to an element in | 47 // by ':'. Each of the elements in the list corresponds to an element in |
| 48 // |reserved_slots|, except the last one which is the |total_jobs|. | 48 // |reserved_slots|, except the last one which is the |total_jobs|. |
| 49 | 49 |
| 50 std::vector<std::string> group_parts; | 50 std::vector<std::string> group_parts; |
| 51 base::SplitString(group, ':', &group_parts); | 51 base::SplitString(group, ':', &group_parts); |
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| 88 : max_concurrent_resolves(kDefaultParallelism), | 88 : max_concurrent_resolves(kDefaultParallelism), |
| 89 max_retry_attempts(kDefaultRetryAttempts), | 89 max_retry_attempts(kDefaultRetryAttempts), |
| 90 enable_caching(true) { | 90 enable_caching(true) { |
| 91 } | 91 } |
| 92 | 92 |
| 93 HostResolver::RequestInfo::RequestInfo(const HostPortPair& host_port_pair) | 93 HostResolver::RequestInfo::RequestInfo(const HostPortPair& host_port_pair) |
| 94 : host_port_pair_(host_port_pair), | 94 : host_port_pair_(host_port_pair), |
| 95 address_family_(ADDRESS_FAMILY_UNSPECIFIED), | 95 address_family_(ADDRESS_FAMILY_UNSPECIFIED), |
| 96 host_resolver_flags_(0), | 96 host_resolver_flags_(0), |
| 97 allow_cached_response_(true), | 97 allow_cached_response_(true), |
| 98 is_speculative_(false) {} | 98 is_speculative_(false) { |
| 99 } |
| 99 | 100 |
| 100 HostResolver::~HostResolver() { | 101 HostResolver::~HostResolver() { |
| 101 } | 102 } |
| 102 | 103 |
| 103 AddressFamily HostResolver::GetDefaultAddressFamily() const { | 104 AddressFamily HostResolver::GetDefaultAddressFamily() const { |
| 104 return ADDRESS_FAMILY_UNSPECIFIED; | 105 return ADDRESS_FAMILY_UNSPECIFIED; |
| 105 } | 106 } |
| 106 | 107 |
| 107 void HostResolver::SetDnsClientEnabled(bool enabled) { | 108 void HostResolver::SetDnsClientEnabled(bool enabled) { |
| 108 } | 109 } |
| 109 | 110 |
| 110 HostCache* HostResolver::GetHostCache() { | 111 HostCache* HostResolver::GetHostCache() { |
| 111 return NULL; | 112 return NULL; |
| 112 } | 113 } |
| 113 | 114 |
| 114 base::Value* HostResolver::GetDnsConfigAsValue() const { | 115 base::Value* HostResolver::GetDnsConfigAsValue() const { |
| 115 return NULL; | 116 return NULL; |
| 116 } | 117 } |
| 117 | 118 |
| 118 // static | 119 // static |
| 119 scoped_ptr<HostResolver> | 120 scoped_ptr<HostResolver> HostResolver::CreateSystemResolver( |
| 120 HostResolver::CreateSystemResolver(const Options& options, NetLog* net_log) { | 121 const Options& options, |
| 122 NetLog* net_log) { |
| 121 scoped_ptr<HostCache> cache; | 123 scoped_ptr<HostCache> cache; |
| 122 if (options.enable_caching) | 124 if (options.enable_caching) |
| 123 cache = HostCache::CreateDefaultCache(); | 125 cache = HostCache::CreateDefaultCache(); |
| 124 return scoped_ptr<HostResolver>(new HostResolverImpl( | 126 return scoped_ptr<HostResolver>(new HostResolverImpl( |
| 125 cache.Pass(), | 127 cache.Pass(), |
| 126 GetDispatcherLimits(options), | 128 GetDispatcherLimits(options), |
| 127 HostResolverImpl::ProcTaskParams(NULL, options.max_retry_attempts), | 129 HostResolverImpl::ProcTaskParams(NULL, options.max_retry_attempts), |
| 128 net_log)); | 130 net_log)); |
| 129 } | 131 } |
| 130 | 132 |
| 131 // static | 133 // static |
| 132 scoped_ptr<HostResolver> | 134 scoped_ptr<HostResolver> HostResolver::CreateDefaultResolver(NetLog* net_log) { |
| 133 HostResolver::CreateDefaultResolver(NetLog* net_log) { | |
| 134 return CreateSystemResolver(Options(), net_log); | 135 return CreateSystemResolver(Options(), net_log); |
| 135 } | 136 } |
| 136 | 137 |
| 137 HostResolver::HostResolver() { | 138 HostResolver::HostResolver() { |
| 138 } | 139 } |
| 139 | 140 |
| 140 } // namespace net | 141 } // namespace net |
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