1 /* 2 * Copyright (c) 2015, Intel Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation and/or 13 * other materials provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors 16 * may be used to endorse or promote products derived from this software without 17 * specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #pragma once 31 32 #include <SubsystemObject.h> 33 #include <AlwaysAssert.hpp> 34 #include <string> 35 36 class CMappingContext; 37 38 namespace parameterFramework 39 { 40 namespace introspectionSubsystem 41 { 42 43 /** This subsystem object exposes a boolean parameter. The value of this parameter 44 * can be retrieved by an external code that calls the getSingletonInstanceValue() 45 * static method. 46 */ 47 class SubsystemObject final : public CSubsystemObject 48 { 49 public: 50 SubsystemObject(const std::string &mappingValue, 51 CInstanceConfigurableElement *instanceConfigurableElement, 52 const CMappingContext &context, core::log::Logger &logger); 53 ~SubsystemObject(); 54 getSingletonInstanceValue()55 static bool getSingletonInstanceValue() 56 { 57 ALWAYS_ASSERT(mSingletonInstance != nullptr, "Singleton value has not been registered"); 58 return mSingletonInstance->mParameter; 59 } 60 61 private: 62 using base = CSubsystemObject; 63 64 virtual bool sendToHW(std::string &error) override; 65 virtual bool receiveFromHW(std::string &error) override; 66 registerInstance(const SubsystemObject & instance)67 static void registerInstance(const SubsystemObject &instance) 68 { 69 ALWAYS_ASSERT(mSingletonInstance == nullptr, "An instance is already registered"); 70 mSingletonInstance = &instance; 71 } 72 unregisterInstance(const SubsystemObject & instance)73 static void unregisterInstance(const SubsystemObject &instance) 74 { 75 // instance parameter is only used by assertion, so unused in release mode 76 (void)instance; 77 78 ALWAYS_ASSERT(mSingletonInstance == &instance, "This instance was not registered."); 79 mSingletonInstance = nullptr; 80 } 81 82 static const std::size_t parameterSize = sizeof(bool); 83 84 static const SubsystemObject *mSingletonInstance; 85 86 bool mParameter; 87 }; 88 } // namespace introspectionSubsystem 89 } // namespace parameterFramework 90