1 /* 2 * Copyright (C) 2016 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 #ifndef ANDROID_HARDWARD_HIDLMEMORY_CACHE_H 17 #define ANDROID_HARDWARD_HIDLMEMORY_CACHE_H 18 19 #include <android/hidl/memory/block/1.0/types.h> 20 #include <android/hidl/memory/token/1.0/IMemoryToken.h> 21 #include <hidl/HidlBinderSupport.h> 22 #include <hwbinder/IBinder.h> 23 #include <utils/RefBase.h> 24 #include "HidlCache.h" 25 26 namespace android { 27 namespace hardware { 28 29 struct IMemoryTokenCompare { 30 using IMemoryToken = ::android::hidl::memory::token::V1_0::IMemoryToken; operatorIMemoryTokenCompare31 bool operator()(const sp<IMemoryToken>& lhs, const sp<IMemoryToken>& rhs) const { 32 sp<IBinder> lb = toBinder<IMemoryToken>(lhs); 33 sp<IBinder> rb = toBinder<IMemoryToken>(rhs); 34 return lb < rb; 35 } 36 }; 37 38 // The HidlMemoryCache is a singleton class to provides cache for 39 // IMemoryToken => ::android::hidl::memory::V1_0::IMemory 40 // It's an abstraction layer on top of the IMapper and supports, but is 41 // not limited to, the Ashmem type HidlMemory. 42 class HidlMemoryCache 43 : public virtual HidlCache<sp<::android::hidl::memory::token::V1_0::IMemoryToken>, 44 ::android::hidl::memory::V1_0::IMemory, IMemoryTokenCompare> { 45 using IMemoryToken = ::android::hidl::memory::token::V1_0::IMemoryToken; 46 using IMemory = ::android::hidl::memory::V1_0::IMemory; 47 using MemoryBlock = ::android::hidl::memory::block::V1_0::MemoryBlock; 48 49 public: 50 virtual sp<IMemory> map(const MemoryBlock& block); 51 // get the singleton 52 static sp<HidlMemoryCache> getInstance(); 53 54 protected: HidlMemoryCache()55 HidlMemoryCache() {} 56 virtual sp<IMemory> fillLocked(const sp<IMemoryToken>& key) override; 57 }; 58 59 } // namespace hardware 60 } // namespace android 61 62 #endif 63