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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 "sync/internal_api/public/engine/model_safe_worker.h" | |
| 6 | |
| 7 #include <memory> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/json/json_writer.h" | |
| 11 #include "base/threading/thread_task_runner_handle.h" | |
| 12 #include "base/values.h" | |
| 13 | |
| 14 namespace syncer { | |
| 15 | |
| 16 std::unique_ptr<base::DictionaryValue> ModelSafeRoutingInfoToValue( | |
| 17 const ModelSafeRoutingInfo& routing_info) { | |
| 18 std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue()); | |
| 19 for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin(); | |
| 20 it != routing_info.end(); ++it) { | |
| 21 dict->SetString(ModelTypeToString(it->first), | |
| 22 ModelSafeGroupToString(it->second)); | |
| 23 } | |
| 24 return dict; | |
| 25 } | |
| 26 | |
| 27 std::string ModelSafeRoutingInfoToString( | |
| 28 const ModelSafeRoutingInfo& routing_info) { | |
| 29 std::string json; | |
| 30 base::JSONWriter::Write(*ModelSafeRoutingInfoToValue(routing_info), &json); | |
| 31 return json; | |
| 32 } | |
| 33 | |
| 34 ModelTypeSet GetRoutingInfoTypes(const ModelSafeRoutingInfo& routing_info) { | |
| 35 ModelTypeSet types; | |
| 36 for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin(); | |
| 37 it != routing_info.end(); ++it) { | |
| 38 types.Put(it->first); | |
| 39 } | |
| 40 return types; | |
| 41 } | |
| 42 | |
| 43 ModelSafeGroup GetGroupForModelType(const ModelType type, | |
| 44 const ModelSafeRoutingInfo& routes) { | |
| 45 ModelSafeRoutingInfo::const_iterator it = routes.find(type); | |
| 46 if (it == routes.end()) { | |
| 47 if (type != UNSPECIFIED && type != TOP_LEVEL_FOLDER) | |
| 48 DVLOG(1) << "Entry does not belong to active ModelSafeGroup!"; | |
| 49 return GROUP_PASSIVE; | |
| 50 } | |
| 51 return it->second; | |
| 52 } | |
| 53 | |
| 54 std::string ModelSafeGroupToString(ModelSafeGroup group) { | |
| 55 switch (group) { | |
| 56 case GROUP_UI: | |
| 57 return "GROUP_UI"; | |
| 58 case GROUP_DB: | |
| 59 return "GROUP_DB"; | |
| 60 case GROUP_FILE: | |
| 61 return "GROUP_FILE"; | |
| 62 case GROUP_HISTORY: | |
| 63 return "GROUP_HISTORY"; | |
| 64 case GROUP_PASSIVE: | |
| 65 return "GROUP_PASSIVE"; | |
| 66 case GROUP_PASSWORD: | |
| 67 return "GROUP_PASSWORD"; | |
| 68 case GROUP_NON_BLOCKING: | |
| 69 return "GROUP_NON_BLOCKING"; | |
| 70 default: | |
| 71 NOTREACHED(); | |
| 72 return "INVALID"; | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 ModelSafeWorker::ModelSafeWorker(WorkerLoopDestructionObserver* observer) | |
| 77 : stopped_(false), | |
| 78 work_done_or_stopped_(base::WaitableEvent::ResetPolicy::AUTOMATIC, | |
| 79 base::WaitableEvent::InitialState::NOT_SIGNALED), | |
| 80 observer_(observer) {} | |
| 81 | |
| 82 ModelSafeWorker::~ModelSafeWorker() {} | |
| 83 | |
| 84 void ModelSafeWorker::RequestStop() { | |
| 85 base::AutoLock al(stopped_lock_); | |
| 86 | |
| 87 // Set stop flag but don't signal work_done_or_stopped_ to unblock sync loop | |
| 88 // because the worker may be working and depending on sync command object | |
| 89 // living on sync thread. This prevents any *further* tasks from being posted | |
| 90 // to worker threads (see DoWorkAndWaitUntilDone below), but note that one | |
| 91 // may already be posted. | |
| 92 stopped_ = true; | |
| 93 } | |
| 94 | |
| 95 SyncerError ModelSafeWorker::DoWorkAndWaitUntilDone(const WorkCallback& work) { | |
| 96 { | |
| 97 base::AutoLock al(stopped_lock_); | |
| 98 if (stopped_) | |
| 99 return CANNOT_DO_WORK; | |
| 100 | |
| 101 CHECK(!work_done_or_stopped_.IsSignaled()); | |
| 102 } | |
| 103 | |
| 104 return DoWorkAndWaitUntilDoneImpl(work); | |
| 105 } | |
| 106 | |
| 107 bool ModelSafeWorker::IsStopped() { | |
| 108 base::AutoLock al(stopped_lock_); | |
| 109 return stopped_; | |
| 110 } | |
| 111 | |
| 112 void ModelSafeWorker::WillDestroyCurrentMessageLoop() { | |
| 113 { | |
| 114 base::AutoLock al(stopped_lock_); | |
| 115 stopped_ = true; | |
| 116 | |
| 117 // Must signal to unblock syncer if it's waiting for a posted task to | |
| 118 // finish. At this point, all pending tasks posted to the loop have been | |
| 119 // destroyed (see MessageLoop::~MessageLoop). So syncer will be blocked | |
| 120 // indefinitely without signaling here. | |
| 121 work_done_or_stopped_.Signal(); | |
| 122 | |
| 123 DVLOG(1) << ModelSafeGroupToString(GetModelSafeGroup()) | |
| 124 << " worker stops on destruction of its working thread."; | |
| 125 } | |
| 126 | |
| 127 { | |
| 128 base::AutoLock l(working_task_runner_lock_); | |
| 129 working_task_runner_ = NULL; | |
| 130 } | |
| 131 | |
| 132 if (observer_) | |
| 133 observer_->OnWorkerLoopDestroyed(GetModelSafeGroup()); | |
| 134 } | |
| 135 | |
| 136 void ModelSafeWorker::SetWorkingLoopToCurrent() { | |
| 137 base::Callback<void(ModelSafeGroup)> unregister_done_callback; | |
| 138 | |
| 139 { | |
| 140 base::AutoLock l(working_task_runner_lock_); | |
| 141 DCHECK(!working_task_runner_); | |
| 142 | |
| 143 if (unregister_done_callback_.is_null()) { | |
| 144 // Expected case - UnregisterForLoopDestruction hasn't been called yet. | |
| 145 base::MessageLoop::current()->AddDestructionObserver(this); | |
| 146 working_task_runner_ = base::ThreadTaskRunnerHandle::Get(); | |
| 147 } else { | |
| 148 // Rare case which is possible when the model type thread remains | |
| 149 // blocked for the entire session and UnregisterForLoopDestruction ends | |
| 150 // up being called before this method. This method is posted unlike | |
| 151 // UnregisterForLoopDestruction - that's why they can end up being called | |
| 152 // out of order. | |
| 153 // In this case we skip the destruction observer registration | |
| 154 // and just invoke the callback stored at UnregisterForLoopDestruction. | |
| 155 DCHECK(stopped_); | |
| 156 unregister_done_callback = unregister_done_callback_; | |
| 157 unregister_done_callback_.Reset(); | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 if (!unregister_done_callback.is_null()) { | |
| 162 unregister_done_callback.Run(GetModelSafeGroup()); | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 void ModelSafeWorker::UnregisterForLoopDestruction( | |
| 167 base::Callback<void(ModelSafeGroup)> unregister_done_callback) { | |
| 168 base::AutoLock l(working_task_runner_lock_); | |
| 169 if (working_task_runner_) { | |
| 170 // Normal case - observer registration has been already done. | |
| 171 // Delegate to the sync thread to do the actual unregistration in | |
| 172 // UnregisterForLoopDestructionAsync. | |
| 173 DCHECK(!working_task_runner_->BelongsToCurrentThread()); | |
| 174 working_task_runner_->PostTask( | |
| 175 FROM_HERE, | |
| 176 base::Bind(&ModelSafeWorker::UnregisterForLoopDestructionAsync, this, | |
| 177 unregister_done_callback)); | |
| 178 } else { | |
| 179 // The working loop is still unknown, probably because the model type | |
| 180 // thread is blocked. Store the callback to be called from | |
| 181 // SetWorkingLoopToCurrent. | |
| 182 unregister_done_callback_ = unregister_done_callback; | |
| 183 } | |
| 184 } | |
| 185 | |
| 186 void ModelSafeWorker::UnregisterForLoopDestructionAsync( | |
| 187 base::Callback<void(ModelSafeGroup)> unregister_done_callback) { | |
| 188 { | |
| 189 base::AutoLock l(working_task_runner_lock_); | |
| 190 if (!working_task_runner_) | |
| 191 return; | |
| 192 DCHECK(working_task_runner_->BelongsToCurrentThread()); | |
| 193 } | |
| 194 | |
| 195 DCHECK(stopped_); | |
| 196 base::MessageLoop::current()->RemoveDestructionObserver(this); | |
| 197 unregister_done_callback.Run(GetModelSafeGroup()); | |
| 198 } | |
| 199 | |
| 200 } // namespace syncer | |
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Chromium Code Reviews
Issue 2130453004:
[Sync] Move //sync to //components/sync. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master