Implement UWB AdapterStateListener (93964f8f) · Commits · e / os / android_frameworks_base

core/java/android/uwb/AdapterStateListener.java

0 → 100644

+149 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2020 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.
		*/

		package android.uwb;

		import android.annotation.NonNull;
		import android.os.Binder;
		import android.os.RemoteException;
		import android.util.Log;
		import android.uwb.UwbManager.AdapterStateCallback;
		import android.uwb.UwbManager.AdapterStateCallback.StateChangedReason;

		import java.util.HashMap;
		import java.util.Map;
		import java.util.concurrent.Executor;

		/**
		* @hide
		*/
		public class AdapterStateListener extends IUwbAdapterStateCallbacks.Stub {
		private static final String TAG = "Uwb.StateListener";

		private final IUwbAdapter mAdapter;
		private boolean mIsRegistered = false;

		private final Map<AdapterStateCallback, Executor> mCallbackMap = new HashMap<>();

		@StateChangedReason
		private int mAdapterStateChangeReason = AdapterStateCallback.STATE_CHANGED_REASON_ERROR_UNKNOWN;
		private boolean mAdapterEnabledState = false;

		public AdapterStateListener(@NonNull IUwbAdapter adapter) {
		mAdapter = adapter;
		}

		/**
		* Register an {@link AdapterStateCallback} with this {@link AdapterStateListener}
		*
		* @param executor an {@link Executor} to execute given callback
		* @param callback user implementation of the {@link AdapterStateCallback}
		*/
		public void register(@NonNull Executor executor, @NonNull AdapterStateCallback callback) {
		synchronized (this) {
		if (mCallbackMap.containsKey(callback)) {
		return;
		}

		mCallbackMap.put(callback, executor);

		if (!mIsRegistered) {
		try {
		mAdapter.registerAdapterStateCallbacks(this);
		mIsRegistered = true;
		} catch (RemoteException e) {
		Log.w(TAG, "Failed to register adapter state callback");
		executor.execute(() -> callback.onStateChanged(false,
		AdapterStateCallback.STATE_CHANGED_REASON_ERROR_UNKNOWN));
		}
		} else {
		sendCurrentState(callback);
		}
		}
		}

		/**
		* Unregister the specified {@link AdapterStateCallback}
		*
		* @param callback user implementation of the {@link AdapterStateCallback}
		*/
		public void unregister(@NonNull AdapterStateCallback callback) {
		synchronized (this) {
		if (!mCallbackMap.containsKey(callback)) {
		return;
		}

		mCallbackMap.remove(callback);

		if (mCallbackMap.isEmpty() && mIsRegistered) {
		try {
		mAdapter.unregisterAdapterStateCallbacks(this);
		} catch (RemoteException e) {
		Log.w(TAG, "Failed to unregister AdapterStateCallback with service");
		}
		mIsRegistered = false;
		}
		}
		}

		private void sendCurrentState(@NonNull AdapterStateCallback callback) {
		synchronized (this) {
		Executor executor = mCallbackMap.get(callback);

		final long identity = Binder.clearCallingIdentity();
		try {
		executor.execute(() -> callback.onStateChanged(
		mAdapterEnabledState, mAdapterStateChangeReason));
		} finally {
		Binder.restoreCallingIdentity(identity);
		}
		}
		}

		@Override
		public void onAdapterStateChanged(boolean isEnabled, int reason) {
		synchronized (this) {
		@StateChangedReason int localReason =
		convertToStateChangedReason(reason);
		mAdapterEnabledState = isEnabled;
		mAdapterStateChangeReason = localReason;
		for (AdapterStateCallback cb : mCallbackMap.keySet()) {
		sendCurrentState(cb);
		}
		}
		}

		private static @StateChangedReason int convertToStateChangedReason(
		@StateChangeReason int reason) {
		switch (reason) {
		case StateChangeReason.ALL_SESSIONS_CLOSED:
		return AdapterStateCallback.STATE_CHANGED_REASON_ALL_SESSIONS_CLOSED;

		case StateChangeReason.SESSION_STARTED:
		return AdapterStateCallback.STATE_CHANGED_REASON_SESSION_STARTED;

		case StateChangeReason.SYSTEM_POLICY:
		return AdapterStateCallback.STATE_CHANGED_REASON_SYSTEM_POLICY;

		case StateChangeReason.SYSTEM_BOOT:
		return AdapterStateCallback.STATE_CHANGED_REASON_SYSTEM_BOOT;

		case StateChangeReason.UNKNOWN:
		default:
		return AdapterStateCallback.STATE_CHANGED_REASON_ERROR_UNKNOWN;
		}
		}
		}

core/java/android/uwb/StateChangeReason.aidl

+5 −0

Original line number	Diff line number	Diff line
		@@ -41,5 +41,10 @@ enum StateChangeReason {
		* The adapter state changed because of a device system change.
		*/
		SYSTEM_POLICY,

		/**
		* Used to signal the first adapter state message after boot
		*/
		SYSTEM_BOOT,
		}

core/java/android/uwb/UwbManager.java

+9 −4

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package android.uwb;

		import android.annotation.CallbackExecutor;
		import android.annotation.IntDef;
		import android.annotation.NonNull;
		import android.annotation.SuppressLint;
		@@ -48,6 +49,8 @@ public final class UwbManager {
		private IUwbAdapter mUwbAdapter;
		private static final String SERVICE_NAME = "uwb";

		private AdapterStateListener mAdapterStateListener;

		/**
		* Interface for receiving UWB adapter state changes
		*/
		@@ -112,6 +115,7 @@ public final class UwbManager {
		*/
		private UwbManager(IUwbAdapter adapter) {
		mUwbAdapter = adapter;
		mAdapterStateListener = new AdapterStateListener(adapter);
		}

		/**
		@@ -143,8 +147,9 @@ public final class UwbManager {
		* @param executor an {@link Executor} to execute given callback
		* @param callback user implementation of the {@link AdapterStateCallback}
		*/
		public void registerAdapterStateCallback(Executor executor, AdapterStateCallback callback) {
		throw new UnsupportedOperationException();
		public void registerAdapterStateCallback(@NonNull @CallbackExecutor Executor executor,
		@NonNull AdapterStateCallback callback) {
		mAdapterStateListener.register(executor, callback);
		}

		/**
		@@ -156,8 +161,8 @@ public final class UwbManager {
		*
		* @param callback user implementation of the {@link AdapterStateCallback}
		*/
		public void unregisterAdapterStateCallback(AdapterStateCallback callback) {
		throw new UnsupportedOperationException();
		public void unregisterAdapterStateCallback(@NonNull AdapterStateCallback callback) {
		mAdapterStateListener.unregister(callback);
		}

		/**