| /* |
| * Copyright (C) 2016 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.os.health; |
| |
| import android.annotation.TestApi; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| import java.lang.reflect.Field; |
| import java.util.Arrays; |
| |
| /** |
| * Constants and stuff for the android.os.health package. |
| * |
| * @hide |
| */ |
| @TestApi |
| public class HealthKeys { |
| |
| /** |
| * No valid key will ever be 0. |
| */ |
| public static final int UNKNOWN_KEY = 0; |
| |
| /* |
| * Base key for each of the different classes. There is |
| * nothing intrinsic to the operation of the value of the |
| * keys. It's just segmented for better debugging. The |
| * classes don't mix them anway. |
| */ |
| public static final int BASE_UID = 10000; |
| public static final int BASE_PID = 20000; |
| public static final int BASE_PROCESS = 30000; |
| public static final int BASE_PACKAGE = 40000; |
| public static final int BASE_SERVICE = 50000; |
| |
| /* |
| * The types of values supported by HealthStats. |
| */ |
| public static final int TYPE_TIMER = 0; |
| public static final int TYPE_MEASUREMENT = 1; |
| public static final int TYPE_STATS = 2; |
| public static final int TYPE_TIMERS = 3; |
| public static final int TYPE_MEASUREMENTS = 4; |
| |
| public static final int TYPE_COUNT = 5; |
| |
| /** |
| * Annotation to mark public static final int fields that are to be used |
| * as field keys in HealthStats. |
| */ |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.FIELD}) |
| public @interface Constant { |
| /** |
| * One of the TYPE_* constants above. |
| */ |
| int type(); |
| } |
| |
| /** |
| * Class to gather the constants defined in a class full of constants and |
| * build the key indices used by HealthStatsWriter and HealthStats. |
| * |
| * @hide |
| */ |
| @TestApi |
| public static class Constants { |
| private final String mDataType; |
| private final int[][] mKeys = new int[TYPE_COUNT][]; |
| |
| /** |
| * Pass in a class to gather the public static final int fields that are |
| * tagged with the @Constant annotation. |
| */ |
| public Constants(Class clazz) { |
| // Save the class name for debugging |
| mDataType = clazz.getSimpleName(); |
| |
| // Iterate through the list of fields on this class, and build the |
| // constant arrays for these fields. |
| final Field[] fields = clazz.getDeclaredFields(); |
| final Class<Constant> annotationClass = Constant.class; |
| |
| final int N = fields.length; |
| |
| final SortedIntArray[] keys = new SortedIntArray[mKeys.length]; |
| for (int i=0; i<keys.length; i++) { |
| keys[i] = new SortedIntArray(N); |
| } |
| |
| for (int i=0; i<N; i++) { |
| final Field field = fields[i]; |
| final Constant constant = field.getAnnotation(annotationClass); |
| if (constant != null) { |
| final int type = constant.type(); |
| if (type >= keys.length) { |
| throw new RuntimeException("Unknown Constant type " + type |
| + " on " + field); |
| } |
| try { |
| keys[type].addValue(field.getInt(null)); |
| } catch (IllegalAccessException ex) { |
| throw new RuntimeException("Can't read constant value type=" + type |
| + " field=" + field, ex); |
| } |
| } |
| } |
| |
| for (int i=0; i<keys.length; i++) { |
| mKeys[i] = keys[i].getArray(); |
| } |
| } |
| |
| /** |
| * Get a string representation of this class. Useful for debugging. It will be the |
| * simple name of the class passed in the constructor. |
| */ |
| public String getDataType() { |
| return mDataType; |
| } |
| |
| /** |
| * Return how many keys there are for the given field type. |
| * |
| * @see TYPE_TIMER |
| * @see TYPE_MEASUREMENT |
| * @see TYPE_TIMERS |
| * @see TYPE_MEASUREMENTS |
| * @see TYPE_STATS |
| */ |
| public int getSize(int type) { |
| return mKeys[type].length; |
| } |
| |
| /** |
| * Return the index for the given type and key combination in the array of field |
| * keys or values. |
| * |
| * @see TYPE_TIMER |
| * @see TYPE_MEASUREMENT |
| * @see TYPE_TIMERS |
| * @see TYPE_MEASUREMENTS |
| * @see TYPE_STATS |
| */ |
| public int getIndex(int type, int key) { |
| final int index = Arrays.binarySearch(mKeys[type], key); |
| if (index >= 0) { |
| return index; |
| } else { |
| throw new RuntimeException("Unknown Constant " + key + " (of type " |
| + type + " )"); |
| } |
| } |
| |
| /** |
| * Get the array of keys for the given field type. |
| */ |
| public int[] getKeys(int type) { |
| return mKeys[type]; |
| } |
| } |
| |
| /** |
| * An array of fixed size that will be sorted. |
| */ |
| private static class SortedIntArray { |
| int mCount; |
| int[] mArray; |
| |
| /** |
| * Construct with the maximum number of values. |
| */ |
| SortedIntArray(int maxCount) { |
| mArray = new int[maxCount]; |
| } |
| |
| /** |
| * Add a value. |
| */ |
| void addValue(int value) { |
| mArray[mCount++] = value; |
| } |
| |
| /** |
| * Get the array of values that have been added, with the values in |
| * numerically increasing order. |
| */ |
| int[] getArray() { |
| if (mCount == mArray.length) { |
| Arrays.sort(mArray); |
| return mArray; |
| } else { |
| final int[] result = new int[mCount]; |
| System.arraycopy(mArray, 0, result, 0, mCount); |
| Arrays.sort(result); |
| return result; |
| } |
| } |
| } |
| } |
| |
| |