health: Add default impl of health AIDL HAL
Compared to the HIDL HAL implementation,
- libhealthloop (and the HealthLoop class) is kept
- Create libhealthaidlimpl that replaces libhealth2impl. Fork the implementation because
libhealth2impl is highly coupled with HIDL’s design rationale. This includes forking:
- HalHealthLoop
- Health implementation
- Combine the passthrough Health and hwbinder BinderHealth classes into the AIDL
implementation of Health. This is because AIDL does not support passthrough transport.
Separating the implementation for the two transports in HIDL does not make sense for AIDL.
- In HIDL, a BinderHealth is a HalHealthLoop which is composed of a (passthrough)
Health implementation. As a result of this change, in AIDL, a Health implementation
is a HalHealthLoop, which associates with the Health implementation itself with a raw
pointer.
- hidl_death_recipient becomes ScopedAIBinder_DeathRecipient
- Callback becomes LinkedCallback
Test: manual
Bug: 177269435
Change-Id: I76e914117ce09b218cdb9d655f2135d29bb629ae
diff --git a/health/aidl/default/LinkedCallback.cpp b/health/aidl/default/LinkedCallback.cpp
new file mode 100644
index 0000000..2985ffe
--- /dev/null
+++ b/health/aidl/default/LinkedCallback.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2021 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 <android-base/logging.h>
+#include <android/binder_ibinder.h>
+
+#include <health-impl/Health.h>
+#include <utils/Errors.h>
+
+#include "LinkedCallback.h"
+
+namespace aidl::android::hardware::health {
+
+std::unique_ptr<LinkedCallback> LinkedCallback::Make(
+ std::shared_ptr<Health> service, std::shared_ptr<IHealthInfoCallback> callback) {
+ std::unique_ptr<LinkedCallback> ret(new LinkedCallback());
+ binder_status_t linkRet =
+ AIBinder_linkToDeath(callback->asBinder().get(), service->death_recipient_.get(),
+ reinterpret_cast<void*>(ret.get()));
+ if (linkRet != ::STATUS_OK) {
+ LOG(WARNING) << __func__ << "Cannot link to death: " << linkRet;
+ return nullptr;
+ }
+ ret->service_ = service;
+ ret->callback_ = std::move(callback);
+ return ret;
+}
+
+LinkedCallback::LinkedCallback() = default;
+
+LinkedCallback::~LinkedCallback() {
+ if (callback_ == nullptr) {
+ return;
+ }
+ auto status =
+ AIBinder_unlinkToDeath(callback_->asBinder().get(), service()->death_recipient_.get(),
+ reinterpret_cast<void*>(this));
+ if (status != STATUS_OK && status != STATUS_DEAD_OBJECT) {
+ LOG(WARNING) << __func__ << "Cannot unlink to death: " << ::android::statusToString(status);
+ }
+}
+
+std::shared_ptr<Health> LinkedCallback::service() {
+ auto service_sp = service_.lock();
+ CHECK_NE(nullptr, service_sp);
+ return service_sp;
+}
+
+void LinkedCallback::OnCallbackDied() {
+ service()->unregisterCallback(callback_);
+}
+
+} // namespace aidl::android::hardware::health