1 /* 2 * Copyright 2009, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.app; 18 19 import android.app.backup.IBackupManager; 20 import android.os.ParcelFileDescriptor; 21 22 /** 23 * Interface presented by applications being asked to participate in the 24 * backup & restore mechanism. End user code will not typically implement 25 * this interface directly; they subclass BackupAgent instead. 26 * 27 * {@hide} 28 */ 29 oneway interface IBackupAgent { 30 /** 31 * Request that the app perform an incremental backup. 32 * 33 * @param oldState Read-only file containing the description blob of the 34 * app's data state as of the last backup operation's completion. 35 * This file is empty or invalid when a full backup is being 36 * requested. 37 * 38 * @param data Read-write file, empty when onBackup() is called, that 39 * is the data destination for this backup pass's incrementals. 40 * 41 * @param newState Read-write file, empty when onBackup() is called, 42 * where the new state blob is to be recorded. 43 * 44 * @param token Opaque token identifying this transaction. This must 45 * be echoed back to the backup service binder once the new 46 * data has been written to the data and newState files. 47 * 48 * @param callbackBinder Binder on which to indicate operation completion, 49 * passed here as a convenience to the agent. 50 */ doBackup(in ParcelFileDescriptor oldState, in ParcelFileDescriptor data, in ParcelFileDescriptor newState, int token, IBackupManager callbackBinder)51 void doBackup(in ParcelFileDescriptor oldState, 52 in ParcelFileDescriptor data, 53 in ParcelFileDescriptor newState, 54 int token, IBackupManager callbackBinder); 55 56 /** 57 * Restore an entire data snapshot to the application. 58 * 59 * @param data Read-only file containing the full data snapshot of the 60 * app's backup. This is to be a <i>replacement</i> of the app's 61 * current data, not to be merged into it. 62 * 63 * @param appVersionCode The android:versionCode attribute of the application 64 * that created this data set. This can help the agent distinguish among 65 * various historical backup content possibilities. 66 * 67 * @param newState Read-write file, empty when onRestore() is called, 68 * that is to be written with the state description that holds after 69 * the restore has been completed. 70 * 71 * @param token Opaque token identifying this transaction. This must 72 * be echoed back to the backup service binder once the agent is 73 * finished restoring the application based on the restore data 74 * contents. 75 * 76 * @param callbackBinder Binder on which to indicate operation completion, 77 * passed here as a convenience to the agent. 78 */ doRestore(in ParcelFileDescriptor data, int appVersionCode, in ParcelFileDescriptor newState, int token, IBackupManager callbackBinder)79 void doRestore(in ParcelFileDescriptor data, 80 int appVersionCode, in ParcelFileDescriptor newState, 81 int token, IBackupManager callbackBinder); 82 83 /** 84 * Perform a "full" backup to the given file descriptor. The output file is presumed 85 * to be a socket or other non-seekable, write-only data sink. When this method is 86 * called, the app should write all of its files to the output. 87 * 88 * @param data Write-only file to receive the backed-up file content stream. 89 * The data must be formatted correctly for the resulting archive to be 90 * legitimate, so that will be tightly controlled by the available API. 91 * 92 * @param token Opaque token identifying this transaction. This must 93 * be echoed back to the backup service binder once the agent is 94 * finished restoring the application based on the restore data 95 * contents. 96 * 97 * @param callbackBinder Binder on which to indicate operation completion, 98 * passed here as a convenience to the agent. 99 */ doFullBackup(in ParcelFileDescriptor data, int token, IBackupManager callbackBinder)100 void doFullBackup(in ParcelFileDescriptor data, int token, IBackupManager callbackBinder); 101 102 /** 103 * Estimate how much data a full backup will deliver 104 */ doMeasureFullBackup(int token, IBackupManager callbackBinder)105 void doMeasureFullBackup(int token, IBackupManager callbackBinder); 106 107 /** 108 * Tells the application agent that the backup data size exceeded current transport quota. 109 * Later calls to {@link #onBackup(ParcelFileDescriptor, BackupDataOutput, ParcelFileDescriptor)} 110 * and {@link #onFullBackup(FullBackupDataOutput)} could use this information 111 * to reduce backup size under the limit. 112 * However, the quota can change, so do not assume that the value passed in here is absolute, 113 * similarly all subsequent backups should not be restricted to this size. 114 * This callback will be invoked before data has been put onto the wire in a preflight check, 115 * so it is relatively inexpensive to hit your quota. 116 * Apps that hit quota repeatedly without dealing with it can be subject to having their backup 117 * schedule reduced. 118 * The {@code quotaBytes} is a loose guideline b/c of metadata added by the backupmanager 119 * so apps should be more aggressive in trimming their backup set. 120 * 121 * @param backupDataBytes Expected or already processed amount of data. 122 * Could be less than total backup size if backup process was interrupted 123 * before finish of processing all backup data. 124 * @param quotaBytes Current amount of backup data that is allowed for the app. 125 */ doQuotaExceeded(long backupDataBytes, long quotaBytes)126 void doQuotaExceeded(long backupDataBytes, long quotaBytes); 127 128 /** 129 * Restore a single "file" to the application. The file was typically obtained from 130 * a full-backup dataset. The agent reads 'size' bytes of file content 131 * from the provided file descriptor. 132 * 133 * @param data Read-only pipe delivering the file content itself. 134 * 135 * @param size Size of the file being restored. 136 * @param type Type of file system entity, e.g. FullBackup.TYPE_DIRECTORY. 137 * @param domain Name of the file's semantic domain to which the 'path' argument is a 138 * relative path. e.g. FullBackup.DATABASE_TREE_TOKEN. 139 * @param path Relative path of the file within its semantic domain. 140 * @param mode Access mode of the file system entity, e.g. 0660. 141 * @param mtime Last modification time of the file system entity. 142 * @param token Opaque token identifying this transaction. This must 143 * be echoed back to the backup service binder once the agent is 144 * finished restoring the application based on the restore data 145 * contents. 146 * @param callbackBinder Binder on which to indicate operation completion, 147 * passed here as a convenience to the agent. 148 */ doRestoreFile(in ParcelFileDescriptor data, long size, int type, String domain, String path, long mode, long mtime, int token, IBackupManager callbackBinder)149 void doRestoreFile(in ParcelFileDescriptor data, long size, 150 int type, String domain, String path, long mode, long mtime, 151 int token, IBackupManager callbackBinder); 152 153 /** 154 * Provide the app with a canonical "all data has been delivered" end-of-restore 155 * callback so that it can do any postprocessing of the restored data that might 156 * be appropriate. This is issued after both key/value and full data restore 157 * operations have completed. 158 * 159 * @param token Opaque token identifying this transaction. This must 160 * be echoed back to the backup service binder once the agent is 161 * finished restoring the application based on the restore data 162 * contents. 163 * @param callbackBinder Binder on which to indicate operation completion, 164 * passed here as a convenience to the agent. 165 */ doRestoreFinished(int token, IBackupManager callbackBinder)166 void doRestoreFinished(int token, IBackupManager callbackBinder); 167 168 /** 169 * Out of band: instruct the agent to crash within the client process. This is used 170 * when the backup infrastructure detects a semantic error post-hoc and needs to 171 * pass the problem back to the app. 172 * 173 * @param message The message to be passed to the agent's application in an exception. 174 */ fail(String message)175 void fail(String message); 176 } 177