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Commit ad54c308 authored by Jaesoo Lee's avatar Jaesoo Lee
Browse files

configstore: add utility library functions for configstore 

this change adds a set of library functions to facilitate
accessing(retrieving) configuration items.

Specifically, added template functions for accessing configuration
items for following types:

OptionalBool, OptionalInt32, OptionalUInt32, OptionalInt64,
OptionalUInt64, OptionalString

Bug: 34724435
Test: build, run

Change-Id: I28d565dcfc04bb71bf891d1b48ce2ec6192eb21f
Merged-in: Icca56d0d9e086b9d94c9b1168df041bf7d418698
parent c5d7c8a2

configstore/Android.bp

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// This is an autogenerated file, do not edit.

subdirs = [

    "1.0",

    "utils",

]

configstore/utils/Android.bp

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//

// Copyright (C) 2017 The Android Open Source Project

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//



cc_library_static {

    name: "android.hardware.configstore-utils",

    export_include_dirs: ["include"],

    srcs: [],

    shared_libs: [

        "android.hardware.configstore@1.0",

    ],

    export_shared_lib_headers: [

        "android.hardware.configstore@1.0",

    ],

}

configstore/utils/include/configstore/Utils.h

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//

// Copyright (C) 2017 The Android Open Source Project

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//



#ifndef ANDROID_HARDWARE_CONFIGSTORE_UTILS_H

#define ANDROID_HARDWARE_CONFIGSTORE_UTILS_H



#include <hidl/Status.h>

#include <stdatomic.h>



namespace android {

namespace hardware {

namespace configstore {

// arguments V: type for the value (i.e., OptionalXXX)

//           I: interface class name

//           func: member function pointer

using namespace V1_0;



template<typename V, typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const V&)>)>

decltype(V::value) get(const decltype(V::value) &defValue) {

    auto getHelper = []()->V {

        V ret;

        sp<I> configs = I::getService();



        if (!configs.get()) {

            // fallback to the default value

            ret.specified = false;

        } else {

            (*configs.*func)([&ret](V v) {

                ret = v;

            });

        }



        return ret;

    };

    static V cachedValue = getHelper();



    return cachedValue.specified ? cachedValue.value : defValue;

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalBool&)>)>

bool getBool(const bool defValue) {

    return get<OptionalBool, I, func>(defValue);

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalInt32&)>)>

int32_t getInt32(const int32_t defValue) {

    return get<OptionalInt32, I, func>(defValue);

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalUInt32&)>)>

uint32_t getUInt32(const uint32_t defValue) {

    return get<OptionalUInt32, I, func>(defValue);

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalInt64&)>)>

int64_t getInt64(const int64_t defValue) {

    return get<OptionalInt64, I, func>(defValue);

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalUInt64&)>)>

uint64_t getUInt64(const uint64_t defValue) {

    return get<OptionalUInt64, I, func>(defValue);

}



template<typename I, android::hardware::Return<void> (I::* func)

        (std::function<void(const OptionalString&)>)>

std::string getString(const std::string &defValue) {

    return get<OptionalString, I, func>(defValue);

}



}  // namespace configstore

}  // namespace hardware

}  // namespace android



#endif  // ANDROID_HARDWARE_CONFIGSTORE_UTILS_H