Clean up connection to sensor hidl service
getService() would block until hidl service up and running. Replace
retry delay with service registration listener to speed up.
Moreover, when getService() return nullptr, it means sensor hidl
service does not exist. Remove retry in this case and return failure.
Bug: 66916774
Test: test device boot
Test: adb shell "stop; start"
Test: kill sensor hidl process
Test: mod manifest file to remove sensor entry
Change-Id: I685971425e97e314699de4630d9adf400aba4af2
diff --git a/services/sensorservice/SensorDeviceUtils.h b/services/sensorservice/SensorDeviceUtils.h
new file mode 100644
index 0000000..da36928
--- /dev/null
+++ b/services/sensorservice/SensorDeviceUtils.h
@@ -0,0 +1,60 @@
+/*
+ * 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_SENSOR_DEVICE_UTIL
+#define ANDROID_SENSOR_DEVICE_UTIL
+
+#include <android/hidl/manager/1.0/IServiceNotification.h>
+
+#include <condition_variable>
+#include <thread>
+
+using ::android::hardware::hidl_string;
+using ::android::hardware::Return;
+using ::android::hidl::manager::V1_0::IServiceNotification;
+
+namespace android {
+namespace SensorDeviceUtils {
+
+class HidlServiceRegistrationWaiter : public IServiceNotification {
+public:
+
+ HidlServiceRegistrationWaiter();
+
+ Return<void> onRegistration(const hidl_string &fqName,
+ const hidl_string &name,
+ bool preexisting) override;
+
+ void reset();
+
+ /**
+ * Wait for service restart
+ *
+ * @return true if service is restart since last reset(); false otherwise.
+ */
+ bool wait();
+private:
+ const bool mRegistered;
+
+ std::mutex mLock;
+ std::condition_variable mCondition;
+ bool mRestartObserved;
+};
+
+} // namespace SensorDeviceUtils
+} // namespace android;
+
+#endif // ANDROID_SENSOR_SERVICE_UTIL