Merge changes from topic "crMoveBack" into main (0b2278d9) · Commits · e / os / android_frameworks_base

packages/CrashRecovery/services/java/com/android/utils/ArrayUtils.java

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		/*
		* Copyright (C) 2024 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.utils;

		import android.annotation.NonNull;
		import android.annotation.Nullable;

		import java.io.File;
		import java.util.List;
		import java.util.Objects;

		/**
		* Copied over from frameworks/base/core/java/com/android/internal/util/ArrayUtils.java
		*
		* @hide
		*/
		public class ArrayUtils {
		private ArrayUtils() { /* cannot be instantiated */ }
		public static final File[] EMPTY_FILE = new File[0];


		/**
		* Return first index of {@code value} in {@code array}, or {@code -1} if
		* not found.
		*/
		public static <T> int indexOf(@Nullable T[] array, T value) {
		if (array == null) return -1;
		for (int i = 0; i < array.length; i++) {
		if (Objects.equals(array[i], value)) return i;
		}
		return -1;
		}

		/** @hide */
		public static @NonNull File[] defeatNullable(@Nullable File[] val) {
		return (val != null) ? val : EMPTY_FILE;
		}

		/**
		* Checks if given array is null or has zero elements.
		*/
		public static boolean isEmpty(@Nullable int[] array) {
		return array == null \|\| array.length == 0;
		}

		/**
		* True if the byte array is null or has length 0.
		*/
		public static boolean isEmpty(@Nullable byte[] array) {
		return array == null \|\| array.length == 0;
		}

		/**
		* Converts from List of bytes to byte array
		* @param list
		* @return byte[]
		*/
		public static byte[] toPrimitive(List<byte[]> list) {
		if (list.size() == 0) {
		return new byte[0];
		}
		int byteLen = list.get(0).length;
		byte[] array = new byte[list.size() * byteLen];
		for (int i = 0; i < list.size(); i++) {
		for (int j = 0; j < list.get(i).length; j++) {
		array[i * byteLen + j] = list.get(i)[j];
		}
		}
		return array;
		}

		/**
		* Adds value to given array if not already present, providing set-like
		* behavior.
		*/
		public static @NonNull int[] appendInt(@Nullable int[] cur, int val) {
		return appendInt(cur, val, false);
		}

		/**
		* Adds value to given array.
		*/
		public static @NonNull int[] appendInt(@Nullable int[] cur, int val,
		boolean allowDuplicates) {
		if (cur == null) {
		return new int[] { val };
		}
		final int n = cur.length;
		if (!allowDuplicates) {
		for (int i = 0; i < n; i++) {
		if (cur[i] == val) {
		return cur;
		}
		}
		}
		int[] ret = new int[n + 1];
		System.arraycopy(cur, 0, ret, 0, n);
		ret[n] = val;
		return ret;
		}
		}

packages/CrashRecovery/services/java/com/android/utils/BackgroundThread.java

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		/*
		* * Copyright (C) 2024 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.utils;

		import android.annotation.NonNull;
		import android.os.Handler;
		import android.os.HandlerThread;

		import com.android.internal.annotations.GuardedBy;

		import java.util.concurrent.Executor;

		/**
		* Thread for asynchronous event processing. This thread is configured as
		* {@link android.os.Process#THREAD_PRIORITY_BACKGROUND}, which means fewer CPU
		* resources will be dedicated to it, and it will "have less chance of impacting
		* the responsiveness of the user interface."
		* <p>
		* This thread is best suited for tasks that the user is not actively waiting
		* for, or for tasks that the user expects to be executed eventually.
		*
		* @see com.android.internal.os.BackgroundThread
		*
		* TODO: b/326916057 depend on modules-utils-backgroundthread instead
		* @hide
		*/
		public final class BackgroundThread extends HandlerThread {
		private static final Object sLock = new Object();

		@GuardedBy("sLock")
		private static BackgroundThread sInstance;
		@GuardedBy("sLock")
		private static Handler sHandler;
		@GuardedBy("sLock")
		private static HandlerExecutor sHandlerExecutor;

		private BackgroundThread() {
		super(BackgroundThread.class.getName(), android.os.Process.THREAD_PRIORITY_BACKGROUND);
		}

		@GuardedBy("sLock")
		private static void ensureThreadLocked() {
		if (sInstance == null) {
		sInstance = new BackgroundThread();
		sInstance.start();
		sHandler = new Handler(sInstance.getLooper());
		sHandlerExecutor = new HandlerExecutor(sHandler);
		}
		}

		/**
		* Get the singleton instance of this class.
		*
		* @return the singleton instance of this class
		*/
		@NonNull
		public static BackgroundThread get() {
		synchronized (sLock) {
		ensureThreadLocked();
		return sInstance;
		}
		}

		/**
		* Get the singleton {@link Handler} for this class.
		*
		* @return the singleton {@link Handler} for this class.
		*/
		@NonNull
		public static Handler getHandler() {
		synchronized (sLock) {
		ensureThreadLocked();
		return sHandler;
		}
		}

		/**
		* Get the singleton {@link Executor} for this class.
		*
		* @return the singleton {@link Executor} for this class.
		*/
		@NonNull
		public static Executor getExecutor() {
		synchronized (sLock) {
		ensureThreadLocked();
		return sHandlerExecutor;
		}
		}
		}

packages/CrashRecovery/services/java/com/android/utils/FileUtils.java

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		/*
		* Copyright (C) 2024 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.utils;

		import android.annotation.NonNull;
		import android.annotation.Nullable;

		import java.io.BufferedInputStream;
		import java.io.ByteArrayOutputStream;
		import java.io.File;
		import java.io.FileInputStream;
		import java.io.FileOutputStream;
		import java.io.IOException;
		import java.io.InputStream;

		/**
		* Bits and pieces copied from hidden API of android.os.FileUtils.
		*
		* @hide
		*/
		public class FileUtils {
		/**
		* Read a text file into a String, optionally limiting the length.
		*
		* @param file to read (will not seek, so things like /proc files are OK)
		* @param max length (positive for head, negative of tail, 0 for no limit)
		* @param ellipsis to add of the file was truncated (can be null)
		* @return the contents of the file, possibly truncated
		* @throws IOException if something goes wrong reading the file
		* @hide
		*/
		public static @Nullable String readTextFile(@Nullable File file, @Nullable int max,
		@Nullable String ellipsis) throws IOException {
		InputStream input = new FileInputStream(file);
		// wrapping a BufferedInputStream around it because when reading /proc with unbuffered
		// input stream, bytes read not equal to buffer size is not necessarily the correct
		// indication for EOF; but it is true for BufferedInputStream due to its implementation.
		BufferedInputStream bis = new BufferedInputStream(input);
		try {
		long size = file.length();
		if (max > 0 \|\| (size > 0 && max == 0)) { // "head" mode: read the first N bytes
		if (size > 0 && (max == 0 \|\| size < max)) max = (int) size;
		byte[] data = new byte[max + 1];
		int length = bis.read(data);
		if (length <= 0) return "";
		if (length <= max) return new String(data, 0, length);
		if (ellipsis == null) return new String(data, 0, max);
		return new String(data, 0, max) + ellipsis;
		} else if (max < 0) { // "tail" mode: keep the last N
		int len;
		boolean rolled = false;
		byte[] last = null;
		byte[] data = null;
		do {
		if (last != null) rolled = true;
		byte[] tmp = last;
		last = data;
		data = tmp;
		if (data == null) data = new byte[-max];
		len = bis.read(data);
		} while (len == data.length);

		if (last == null && len <= 0) return "";
		if (last == null) return new String(data, 0, len);
		if (len > 0) {
		rolled = true;
		System.arraycopy(last, len, last, 0, last.length - len);
		System.arraycopy(data, 0, last, last.length - len, len);
		}
		if (ellipsis == null \|\| !rolled) return new String(last);
		return ellipsis + new String(last);
		} else { // "cat" mode: size unknown, read it all in streaming fashion
		ByteArrayOutputStream contents = new ByteArrayOutputStream();
		int len;
		byte[] data = new byte[1024];
		do {
		len = bis.read(data);
		if (len > 0) contents.write(data, 0, len);
		} while (len == data.length);
		return contents.toString();
		}
		} finally {
		bis.close();
		input.close();
		}
		}

		/**
		* Perform an fsync on the given FileOutputStream. The stream at this
		* point must be flushed but not yet closed.
		*
		* @hide
		*/
		public static boolean sync(FileOutputStream stream) {
		try {
		if (stream != null) {
		stream.getFD().sync();
		}
		return true;
		} catch (IOException e) {
		}
		return false;
		}

		/**
		* List the files in the directory or return empty file.
		*
		* @hide
		*/
		public static @NonNull File[] listFilesOrEmpty(@Nullable File dir) {
		return (dir != null) ? ArrayUtils.defeatNullable(dir.listFiles())
		: ArrayUtils.EMPTY_FILE;
		}
		}

packages/CrashRecovery/services/java/com/android/utils/HandlerExecutor.java

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		/*
		* Copyright (C) 2024 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.utils;

		import android.annotation.NonNull;
		import android.os.Handler;

		import java.util.Objects;
		import java.util.concurrent.Executor;
		import java.util.concurrent.RejectedExecutionException;

		/**
		* An adapter {@link Executor} that posts all executed tasks onto the given
		* {@link Handler}.
		*
		* TODO: b/326916057 depend on modules-utils-backgroundthread instead
		* @hide
		*/
		public class HandlerExecutor implements Executor {
		private final Handler mHandler;

		public HandlerExecutor(@NonNull Handler handler) {
		mHandler = Objects.requireNonNull(handler);
		}

		@Override
		public void execute(Runnable command) {
		if (!mHandler.post(command)) {
		throw new RejectedExecutionException(mHandler + " is shutting down");
		}
		}
		}

packages/CrashRecovery/services/java/com/android/utils/LongArrayQueue.java

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		/*
		* Copyright (C) 2024 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.utils;

		import libcore.util.EmptyArray;

		import java.util.NoSuchElementException;

		/**
		* Copied from frameworks/base/core/java/android/util/LongArrayQueue.java
		*
		* @hide
		*/
		public class LongArrayQueue {

		private long[] mValues;
		private int mSize;
		private int mHead;
		private int mTail;

		private long[] newUnpaddedLongArray(int num) {
		return new long[num];
		}
		/**
		* Initializes a queue with the given starting capacity.
		*
		* @param initialCapacity the capacity.
		*/
		public LongArrayQueue(int initialCapacity) {
		if (initialCapacity == 0) {
		mValues = EmptyArray.LONG;
		} else {
		mValues = newUnpaddedLongArray(initialCapacity);
		}
		mSize = 0;
		mHead = mTail = 0;
		}

		/**
		* Initializes a queue with default starting capacity.
		*/
		public LongArrayQueue() {
		this(16);
		}

		/** @hide */
		public static int growSize(int currentSize) {
		return currentSize <= 4 ? 8 : currentSize * 2;
		}

		private void grow() {
		if (mSize < mValues.length) {
		throw new IllegalStateException("Queue not full yet!");
		}
		final int newSize = growSize(mSize);
		final long[] newArray = newUnpaddedLongArray(newSize);
		final int r = mValues.length - mHead; // Number of elements on and to the right of head.
		System.arraycopy(mValues, mHead, newArray, 0, r);
		System.arraycopy(mValues, 0, newArray, r, mHead);
		mValues = newArray;
		mHead = 0;
		mTail = mSize;
		}

		/**
		* Returns the number of elements in the queue.
		*/
		public int size() {
		return mSize;
		}

		/**
		* Removes all elements from this queue.
		*/
		public void clear() {
		mSize = 0;
		mHead = mTail = 0;
		}

		/**
		* Adds a value to the tail of the queue.
		*
		* @param value the value to be added.
		*/
		public void addLast(long value) {
		if (mSize == mValues.length) {
		grow();
		}
		mValues[mTail] = value;
		mTail = (mTail + 1) % mValues.length;
		mSize++;
		}

		/**
		* Removes an element from the head of the queue.
		*
		* @return the element at the head of the queue.
		* @throws NoSuchElementException if the queue is empty.
		*/
		public long removeFirst() {
		if (mSize == 0) {
		throw new NoSuchElementException("Queue is empty!");
		}
		final long ret = mValues[mHead];
		mHead = (mHead + 1) % mValues.length;
		mSize--;
		return ret;
		}

		/**
		* Returns the element at the given position from the head of the queue, where 0 represents the
		* head of the queue.
		*
		* @param position the position from the head of the queue.
		* @return the element found at the given position.
		* @throws IndexOutOfBoundsException if {@code position} < {@code 0} or
		* {@code position} >= {@link #size()}
		*/
		public long get(int position) {
		if (position < 0 \|\| position >= mSize) {
		throw new IndexOutOfBoundsException("Index " + position
		+ " not valid for a queue of size " + mSize);
		}
		final int index = (mHead + position) % mValues.length;
		return mValues[index];
		}

		/**
		* Returns the element at the head of the queue, without removing it.
		*
		* @return the element at the head of the queue.
		* @throws NoSuchElementException if the queue is empty
		*/
		public long peekFirst() {
		if (mSize == 0) {
		throw new NoSuchElementException("Queue is empty!");
		}
		return mValues[mHead];
		}

		/**
		* Returns the element at the tail of the queue.
		*
		* @return the element at the tail of the queue.
		* @throws NoSuchElementException if the queue is empty.
		*/
		public long peekLast() {
		if (mSize == 0) {
		throw new NoSuchElementException("Queue is empty!");
		}
		final int index = (mTail == 0) ? mValues.length - 1 : mTail - 1;
		return mValues[index];
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public String toString() {
		if (mSize <= 0) {
		return "{}";
		}

		final StringBuilder buffer = new StringBuilder(mSize * 64);
		buffer.append('{');
		buffer.append(get(0));
		for (int i = 1; i < mSize; i++) {
		buffer.append(", ");
		buffer.append(get(i));
		}
		buffer.append('}');
		return buffer.toString();
		}
		}