Add skeleton for BackupRestoreEventLogger (9d027098) · Commits · e / os / android_frameworks_base

core/java/android/app/backup/BackupRestoreEventLogger.java

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		/*
		* Copyright (C) 2022 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.app.backup;

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

		import java.lang.annotation.Retention;
		import java.lang.annotation.RetentionPolicy;
		import java.util.Collections;
		import java.util.List;
		import java.util.Map;

		// TODO(b/244436184): Make this @SystemApi
		/**
		* Class to log B&R stats for each data type that is backed up and restored by the calling app.
		*
		* The logger instance is designed to accept a limited number of unique
		* {link @BackupRestoreDataType} values, as determined by the underlying implementation. Apps are
		* expected to have a small pre-defined set of data type values they use. Attempts to log too many
		* unique values will be rejected.
		*
		* @hide
		*/
		public class BackupRestoreEventLogger {
		/**
		* Max number of unique data types for which an instance of this logger can store info. Attempts
		* to use more distinct data type values will be rejected.
		*/
		public static final int DATA_TYPES_ALLOWED = 15;

		/**
		* Operation types for which this logger can be used.
		*/
		@Retention(RetentionPolicy.SOURCE)
		@IntDef({
		OperationType.BACKUP,
		OperationType.RESTORE
		})
		@interface OperationType {
		int BACKUP = 1;
		int RESTORE = 2;
		}

		/**
		* Denotes that the annotated element identifies a data type as required by the logging methods
		* of {@code BackupRestoreEventLogger}
		*/
		@Retention(RetentionPolicy.SOURCE)
		public @interface BackupRestoreDataType {}

		/**
		* Denotes that the annotated element identifies an error type as required by the logging
		* methods of {@code BackupRestoreEventLogger}
		*/
		@Retention(RetentionPolicy.SOURCE)
		public @interface BackupRestoreError {}

		private final int mOperationType;

		/**
		* @param operationType type of the operation for which logging will be performed. See
		* {@link OperationType}. Attempts to use logging methods that don't match
		* the specified operation type will be rejected (e.g. use backup methods
		* for a restore logger and vice versa).
		*/
		public BackupRestoreEventLogger(@OperationType int operationType) {
		mOperationType = operationType;
		}

		/**
		* Report progress during a backup operation. Call this method for each distinct data type that
		* your {@code BackupAgent} implementation handles for any items of that type that have been
		* successfully backed up. Repeated calls to this method with the same {@code dataType} will
		* increase the total count of items associated with this data type by {@code count}.
		*
		* This method should be called from a {@link BackupAgent} implementation during an ongoing
		* backup operation.
		*
		* @param dataType the type of data being backed.
		* @param count number of items of the given type that have been successfully backed up.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logItemsBackedUp(@NonNull @BackupRestoreDataType String dataType, int count) {
		return true;
		}

		/**
		* Report errors during a backup operation. Call this method whenever items of a certain data
		* type failed to back up. Repeated calls to this method with the same {@code dataType} /
		* {@code error} will increase the total count of items associated with this data type / error
		* by {@code count}.
		*
		* This method should be called from a {@link BackupAgent} implementation during an ongoing
		* backup operation.
		*
		* @param dataType the type of data being backed.
		* @param count number of items of the given type that have failed to back up.
		* @param error optional, the error that has caused the failure.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logItemsBackupFailed(@NonNull @BackupRestoreDataType String dataType, int count,
		@Nullable @BackupRestoreError String error) {
		return true;
		}

		/**
		* Report metadata associated with a data type that is currently being backed up, e.g. name of
		* the selected wallpaper file / package. Repeated calls to this method with the same {@code
		* dataType} will overwrite the previously supplied {@code metaData} value.
		*
		* The logger does not store or transmit the provided metadata value. Instead, it’s replaced
		* with the SHA-256 hash of the provided string.
		*
		* This method should be called from a {@link BackupAgent} implementation during an ongoing
		* backup operation.
		*
		* @param dataType the type of data being backed up.
		* @param metaData the metadata associated with the data type.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logBackupMetaData(@NonNull @BackupRestoreDataType String dataType,
		@NonNull String metaData) {
		return true;
		}

		/**
		* Report progress during a restore operation. Call this method for each distinct data type that
		* your {@code BackupAgent} implementation handles if any items of that type have been
		* successfully restored. Repeated calls to this method with the same {@code dataType} will
		* increase the total count of items associated with this data type by {@code count}.
		*
		* This method should either be called from a {@link BackupAgent} implementation during an
		* ongoing restore operation or during any delayed restore actions the package had scheduled
		* earlier (e.g. complete the restore once a certain dependency becomes available on the
		* device).
		*
		* @param dataType the type of data being restored.
		* @param count number of items of the given type that have been successfully restored.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logItemsRestored(@NonNull @BackupRestoreDataType String dataType, int count) {
		return true;
		}

		/**
		* Report errors during a restore operation. Call this method whenever items of a certain data
		* type failed to restore. Repeated calls to this method with the same {@code dataType} /
		* {@code error} will increase the total count of items associated with this data type / error
		* by {@code count}.
		*
		* This method should either be called from a {@link BackupAgent} implementation during an
		* ongoing restore operation or during any delayed restore actions the package had scheduled
		* earlier (e.g. complete the restore once a certain dependency becomes available on the
		* device).
		*
		* @param dataType the type of data being restored.
		* @param count number of items of the given type that have failed to restore.
		* @param error optional, the error that has caused the failure.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logItemsRestoreFailed(@NonNull @BackupRestoreDataType String dataType, int count,
		@Nullable @BackupRestoreError String error) {
		return true;
		}

		/**
		* Report metadata associated with a data type that is currently being restored, e.g. name of
		* the selected wallpaper file / package. Repeated calls to this method with the same
		* {@code dataType} will overwrite the previously supplied {@code metaData} value.
		*
		* The logger does not store or transmit the provided metadata value. Instead, it’s replaced
		* with the SHA-256 hash of the provided string.
		*
		* This method should either be called from a {@link BackupAgent} implementation during an
		* ongoing restore operation or during any delayed restore actions the package had scheduled
		* earlier (e.g. complete the restore once a certain dependency becomes available on the
		* device).
		*
		* @param dataType the type of data being restored.
		* @param metadata the metadata associated with the data type.
		*
		* @return boolean, indicating whether the log has been accepted.
		*/
		public boolean logRestoreMetadata(@NonNull @BackupRestoreDataType String dataType,
		@NonNull String metadata) {
		return true;
		}

		/**
		* Get the contents of this logger. This method should only be used by B&R code in Android
		* Framework.
		*
		* @hide
		*/
		public List<DataTypeResult> getLoggingResults() {
		return Collections.emptyList();
		}

		/**
		* Get the operation type for which this logger was created. This method should only be used
		* by B&R code in Android Framework.
		*
		* @hide
		*/
		public @OperationType int getOperationType() {
		return mOperationType;
		}

		/**
		* Encapsulate logging results for a single data type.
		*/
		public static class DataTypeResult {
		@BackupRestoreDataType
		private final String mDataType;
		private final int mSuccessCount;
		private final Map<String, Integer> mErrors;
		private final byte[] mMetadataHash;

		public DataTypeResult(String dataType, int successCount,
		Map<String, Integer> errors, byte[] metadataHash) {
		mDataType = dataType;
		mSuccessCount = successCount;
		mErrors = errors;
		mMetadataHash = metadataHash;
		}

		@NonNull
		@BackupRestoreDataType
		public String getDataType() {
		return mDataType;
		}

		/**
		* @return number of items of the given data type that have been successfully backed up or
		* restored.
		*/
		public int getSuccessCount() {
		return mSuccessCount;
		}

		/**
		* @return mapping of {@link BackupRestoreError} to the count of items that are affected by
		* the error.
		*/
		@NonNull
		public Map<String, Integer> getErrors() {
		return mErrors;
		}

		/**
		* @return SHA-256 hash of the metadata or {@code null} of no metadata has been logged for
		* this data type.
		*/
		@Nullable
		public byte[] getMetadataHash() {
		return mMetadataHash;
		}
		}
		}