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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.
*/
#include <functional>
#include <type_traits>
#include <hidl/Status.h>
#include <utils/RefBase.h>
#include <utils/StrongPointer.h>
#include "wifi_hidl_call_util.h"
namespace {
/*
* Example of a user-defined data-type.
*
* Used to verify that, within the internals of HIDL_INVOKE,
* reference parameters are stored by copy.
*/
class Dummy {};
/*
* Example of what a HIDL-generated proxy might look like.
*/
class IExample : public ::android::RefBase {
public:
// The callback type, for a method called startWithCallbackCopy, which
// has a callback that takes an |int|. Both the name, and the value,
// must match what would appear in HIDL-generated code.
using startWithCallbackCopy_cb = std::function<void(int)>;
// The callback type, for a method called startWithCallbackReference, which
// has a callback that takes an |int|. Both the name, and the value,
// must match what would appear in HIDL-generated code.
using startWithCallbackReference_cb = std::function<void(int)>;
// Constants which allow tests to verify that the proxy methods can
// correctly return a value. We use different values for by-copy and
// by-reference, to double-check that a call was dispatched properly.
static constexpr int kByCopyResult = 42;
static constexpr int kByReferenceResult = 420;
// Example of what a no-arg method would look like, if the callback
// is passed by-value.
::android::hardware::Return<void> startWithCallbackCopy(
startWithCallbackCopy_cb _hidl_cb) {
_hidl_cb(kByCopyResult);
return ::android::hardware::Void();
}
// Example of what a no-arg method would look like, if the callback
// is passed by const-reference.
::android::hardware::Return<void> startWithCallbackReference(
const startWithCallbackReference_cb& _hidl_cb) {
_hidl_cb(kByReferenceResult);
return ::android::hardware::Void();
}
};
constexpr int IExample::kByCopyResult;
constexpr int IExample::kByReferenceResult;
} // namespace
static_assert(std::is_same<int, detail::functionArgSaver<
std::function<void(int)>>::StorageT>::value,
"Single-arg result should be stored directly.");
static_assert(
std::is_same<std::pair<int, long>, detail::functionArgSaver<std::function<
void(int, long)>>::StorageT>::value,
"Two-arg result should be stored as a pair.");
static_assert(
std::is_same<std::tuple<char, int, long>,
detail::functionArgSaver<
std::function<void(char, int, long)>>::StorageT>::value,
"Three-arg result should be stored as a tuple.");
static_assert(std::is_same<Dummy, detail::functionArgSaver<std::function<
void(const Dummy&)>>::StorageT>::value,
"Reference should be stored by copy.");
/*
* Verifies that HIDL_INVOKE can be used with methods that take the result
* callback as a by-value parameter. (This reflects the current implementation
* of HIDL-generated code.)
*/
TEST(HidlInvokeTest, WorksWithMethodThatTakesResultCallbackByValue) {
::android::sp<IExample> sp = new IExample();
EXPECT_EQ(IExample::kByCopyResult, HIDL_INVOKE(sp, startWithCallbackCopy));
}
/*
* Verifies that HIDL_INVOKE can be used with methods that take the result
* callback as a const-reference parameter. (This ensures that HIDL_INVOKE will
* continue to work, if the HIDL-generated code switches to const-ref.)
*/
TEST(HidlInvokeTest, WorksWithMethodThatTakesResultCallbackByConstReference) {
::android::sp<IExample> sp = new IExample();
EXPECT_EQ(IExample::kByReferenceResult,
HIDL_INVOKE(sp, startWithCallbackReference));
}
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