1 //
2 // Copyright (C) 2014 The Android Open Source Project
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 
17 #ifndef UPDATE_ENGINE_UPDATE_MANAGER_EVALUATION_CONTEXT_INL_H_
18 #define UPDATE_ENGINE_UPDATE_MANAGER_EVALUATION_CONTEXT_INL_H_
19 
20 #include <string>
21 
22 #include <base/logging.h>
23 
24 namespace chromeos_update_manager {
25 
26 template<typename T>
GetValue(Variable<T> * var)27 const T* EvaluationContext::GetValue(Variable<T>* var) {
28   if (var == nullptr) {
29     LOG(ERROR) << "GetValue received an uninitialized variable.";
30     return nullptr;
31   }
32 
33   // Search for the value on the cache first.
34   ValueCacheMap::iterator it = value_cache_.find(var);
35   if (it != value_cache_.end())
36     return reinterpret_cast<const T*>(it->second.value());
37 
38   // Get the value from the variable if not found on the cache.
39   std::string errmsg;
40   const T* result = var->GetValue(RemainingTime(evaluation_monotonic_deadline_),
41                                   &errmsg);
42   if (result == nullptr) {
43     LOG(WARNING) << "Error reading Variable " << var->GetName() << ": \""
44         << errmsg << "\"";
45   }
46   // Cache the value for the next time. The map of CachedValues keeps the
47   // ownership of the pointer until the map is destroyed.
48   value_cache_.emplace(
49     static_cast<BaseVariable*>(var), BoxedValue(result));
50   return result;
51 }
52 
53 }  // namespace chromeos_update_manager
54 
55 #endif  // UPDATE_ENGINE_UPDATE_MANAGER_EVALUATION_CONTEXT_INL_H_
56