Offload I/O writes to a bg thread in AdditionalSubtypeMapRepository (67bd9adf) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/inputmethod/AdditionalSubtypeMapRepository.java

+161 −3

Original line number	Diff line number	Diff line
		@@ -16,12 +16,16 @@

		package com.android.server.inputmethod;

		import android.annotation.AnyThread;
		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.annotation.UserIdInt;
		import android.annotation.WorkerThread;
		import android.content.Context;
		import android.content.pm.UserInfo;
		import android.os.Handler;
		import android.os.Process;
		import android.util.IntArray;
		import android.util.SparseArray;

		import com.android.internal.annotations.GuardedBy;
		@@ -29,6 +33,10 @@ import com.android.internal.inputmethod.DirectBootAwareness;
		import com.android.server.LocalServices;
		import com.android.server.pm.UserManagerInternal;

		import java.util.ArrayList;
		import java.util.concurrent.locks.Condition;
		import java.util.concurrent.locks.ReentrantLock;

		/**
		* Provides accesses to per-user additional {@link android.view.inputmethod.InputMethodSubtype}
		* persistent storages.
		@@ -38,6 +46,152 @@ final class AdditionalSubtypeMapRepository {
		@NonNull
		private static final SparseArray<AdditionalSubtypeMap> sPerUserMap = new SparseArray<>();

		record WriteTask(@UserIdInt int userId, @NonNull AdditionalSubtypeMap subtypeMap,
		@NonNull InputMethodMap inputMethodMap) {
		}

		static final class SingleThreadedBackgroundWriter {
		/**
		* A {@link ReentrantLock} used to guard {@link #mPendingTasks} and {@link #mRemovedUsers}.
		*/
		@NonNull
		private final ReentrantLock mLock = new ReentrantLock();
		/**
		* A {@link Condition} associated with {@link #mLock} for producer to unblock consumer.
		*/
		@NonNull
		private final Condition mLockNotifier = mLock.newCondition();

		@GuardedBy("mLock")
		@NonNull
		private final SparseArray<WriteTask> mPendingTasks = new SparseArray<>();

		@GuardedBy("mLock")
		private final IntArray mRemovedUsers = new IntArray();

		@NonNull
		private final Thread mWriterThread = new Thread("android.ime.as") {

		/**
		* Waits until the next data has come then return the result after filtering out any
		* already removed users.
		*
		* @return A list of {@link WriteTask} to be written into persistent storage
		*/
		@WorkerThread
		private ArrayList<WriteTask> fetchNextTasks() {
		final SparseArray<WriteTask> tasks;
		final IntArray removedUsers;
		mLock.lock();
		try {
		while (true) {
		if (mPendingTasks.size() != 0) {
		tasks = mPendingTasks.clone();
		mPendingTasks.clear();
		if (mRemovedUsers.size() == 0) {
		removedUsers = null;
		} else {
		removedUsers = mRemovedUsers.clone();
		}
		break;
		}
		mLockNotifier.awaitUninterruptibly();
		}
		} finally {
		mLock.unlock();
		}
		final int size = tasks.size();
		final ArrayList<WriteTask> result = new ArrayList<>(size);
		for (int i = 0; i < size; ++i) {
		final int userId = tasks.keyAt(i);
		if (removedUsers != null && removedUsers.contains(userId)) {
		continue;
		}
		result.add(tasks.valueAt(i));
		}
		return result;
		}

		@WorkerThread
		@Override
		public void run() {
		Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);

		while (true) {
		final ArrayList<WriteTask> tasks = fetchNextTasks();
		tasks.forEach(task -> AdditionalSubtypeUtils.save(
		task.subtypeMap, task.inputMethodMap, task.userId));
		}
		}
		};

		/**
		* Schedules a write operation
		*
		* @param userId the target user ID of this operation
		* @param subtypeMap {@link AdditionalSubtypeMap} to be saved
		* @param inputMethodMap {@link InputMethodMap} to be used to filter our {@code subtypeMap}
		*/
		@AnyThread
		void scheduleWriteTask(@UserIdInt int userId, @NonNull AdditionalSubtypeMap subtypeMap,
		@NonNull InputMethodMap inputMethodMap) {
		final var task = new WriteTask(userId, subtypeMap, inputMethodMap);
		mLock.lock();
		try {
		if (mRemovedUsers.contains(userId)) {
		return;
		}
		mPendingTasks.put(userId, task);
		mLockNotifier.signalAll();
		} finally {
		mLock.unlock();
		}
		}

		/**
		* Called back when a user is being created.
		*
		* @param userId The user ID to be created
		*/
		@AnyThread
		void onUserCreated(@UserIdInt int userId) {
		mLock.lock();
		try {
		for (int i = mRemovedUsers.size() - 1; i >= 0; --i) {
		if (mRemovedUsers.get(i) == userId) {
		mRemovedUsers.remove(i);
		}
		}
		} finally {
		mLock.unlock();
		}
		}

		/**
		* Called back when a user is being removed. Any pending task will be effectively canceled
		* if the user is removed before the task is fulfilled.
		*
		* @param userId The user ID to be removed
		*/
		@AnyThread
		void onUserRemoved(@UserIdInt int userId) {
		mLock.lock();
		try {
		mRemovedUsers.add(userId);
		mPendingTasks.remove(userId);
		} finally {
		mLock.unlock();
		}
		}

		void startThread() {
		mWriterThread.start();
		}
		}

		private static final SingleThreadedBackgroundWriter sWriter =
		new SingleThreadedBackgroundWriter();

		/**
		* Not intended to be instantiated.
		*/
		@@ -64,9 +218,11 @@ final class AdditionalSubtypeMapRepository {
		return;
		}
		sPerUserMap.put(userId, map);
		// TODO: Offload this to a background thread.
		// TODO: Skip if the previous data is exactly the same as new one.
		AdditionalSubtypeUtils.save(map, inputMethodMap, userId);
		sWriter.scheduleWriteTask(userId, map, inputMethodMap);
		}

		static void startWriterThread() {
		sWriter.startThread();
		}

		static void initialize(@NonNull Handler handler, @NonNull Context context) {
		@@ -78,6 +234,7 @@ final class AdditionalSubtypeMapRepository {
		@Override
		public void onUserCreated(UserInfo user, @Nullable Object token) {
		final int userId = user.id;
		sWriter.onUserCreated(userId);
		handler.post(() -> {
		synchronized (ImfLock.class) {
		if (!sPerUserMap.contains(userId)) {
		@@ -99,6 +256,7 @@ final class AdditionalSubtypeMapRepository {
		@Override
		public void onUserRemoved(UserInfo user) {
		final int userId = user.id;
		sWriter.onUserRemoved(userId);
		handler.post(() -> {
		synchronized (ImfLock.class) {
		sPerUserMap.remove(userId);

services/core/java/com/android/server/inputmethod/InputMethodManagerService.java

+4 −0

Original line number	Diff line number	Diff line
		@@ -1547,6 +1547,10 @@ public final class InputMethodManagerService implements IInputMethodManagerImpl.
		InputMethodUtils.setNonSelectedSystemImesDisabledUntilUsed(
		getPackageManagerForUser(mContext, currentUserId),
		newSettings.getEnabledInputMethodList());

		final var unused = SystemServerInitThreadPool.submit(
		AdditionalSubtypeMapRepository::startWriterThread,
		"Start AdditionalSubtypeMapRepository's writer thread");
		}
		}
		}