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.IBackupCallback; 20 import android.app.backup.IBackupManager; 21 import android.os.ParcelFileDescriptor; 22 23 /** 24 * Interface presented by applications being asked to participate in the 25 * backup & restore mechanism. End user code will not typically implement 26 * this interface directly; they subclass BackupAgent instead. 27 * 28 * {@hide} 29 */ 30 oneway interface IBackupAgent { 31 /** 32 * Request that the app perform an incremental backup. 33 * 34 * @param oldState Read-only file containing the description blob of the 35 * app's data state as of the last backup operation's completion. 36 * This file is empty or invalid when a full backup is being 37 * requested. 38 * 39 * @param data Read-write file, empty when onBackup() is called, that 40 * is the data destination for this backup pass's incrementals. 41 * 42 * @param newState Read-write file, empty when onBackup() is called, 43 * where the new state blob is to be recorded. 44 * 45 * @param quota Quota reported by the transport for this backup operation (in bytes). 46 * 47 * @param token Opaque token identifying this transaction. This must 48 * be echoed back to the backup service binder once the new 49 * data has been written to the data and newState files. 50 * 51 * @param callbackBinder Binder on which to indicate operation completion. 52 * 53 * @param transportFlags Flags with additional information about the transport. 54 */ 55 void doBackup(in ParcelFileDescriptor oldState, 56 in ParcelFileDescriptor data, 57 in ParcelFileDescriptor newState, 58 long quotaBytes, IBackupCallback callbackBinder, int transportFlags); 59 60 /** 61 * Restore an entire data snapshot to the application. 62 * 63 * @param data Read-only file containing the full data snapshot of the 64 * app's backup. This is to be a <i>replacement</i> of the app's 65 * current data, not to be merged into it. 66 * 67 * @param appVersionCode The android:versionCode attribute of the application 68 * that created this data set. This can help the agent distinguish among 69 * various historical backup content possibilities. 70 * 71 * @param newState Read-write file, empty when onRestore() is called, 72 * that is to be written with the state description that holds after 73 * the restore has been completed. 74 * 75 * @param token Opaque token identifying this transaction. This must 76 * be echoed back to the backup service binder once the agent is 77 * finished restoring the application based on the restore data 78 * contents. 79 * 80 * @param callbackBinder Binder on which to indicate operation completion, 81 * passed here as a convenience to the agent. 82 */ 83 void doRestore(in ParcelFileDescriptor data, 84 long appVersionCode, in ParcelFileDescriptor newState, 85 int token, IBackupManager callbackBinder); 86 87 /** 88 * Perform a "full" backup to the given file descriptor. The output file is presumed 89 * to be a socket or other non-seekable, write-only data sink. When this method is 90 * called, the app should write all of its files to the output. 91 * 92 * @param data Write-only file to receive the backed-up file content stream. 93 * The data must be formatted correctly for the resulting archive to be 94 * legitimate, so that will be tightly controlled by the available API. 95 * 96 * @param quota Quota reported by the transport for this backup operation (in bytes). 97 * 98 * @param token Opaque token identifying this transaction. This must 99 * be echoed back to the backup service binder once the agent is 100 * finished restoring the application based on the restore data 101 * contents. 102 * 103 * @param callbackBinder Binder on which to indicate operation completion, 104 * passed here as a convenience to the agent. 105 * 106 * @param transportFlags Flags with additional information about transport. 107 */ 108 void doFullBackup(in ParcelFileDescriptor data, long quotaBytes, int token, 109 IBackupManager callbackBinder, int transportFlags); 110 111 /** 112 * Estimate how much data a full backup will deliver 113 */ 114 void doMeasureFullBackup(long quotaBytes, int token, IBackupManager callbackBinder, 115 int transportFlags); 116 117 /** 118 * Tells the application agent that the backup data size exceeded current transport quota. 119 * Later calls to {@link #onBackup(ParcelFileDescriptor, BackupDataOutput, ParcelFileDescriptor)} 120 * and {@link #onFullBackup(FullBackupDataOutput)} could use this information 121 * to reduce backup size under the limit. 122 * However, the quota can change, so do not assume that the value passed in here is absolute, 123 * similarly all subsequent backups should not be restricted to this size. 124 * This callback will be invoked before data has been put onto the wire in a preflight check, 125 * so it is relatively inexpensive to hit your quota. 126 * Apps that hit quota repeatedly without dealing with it can be subject to having their backup 127 * schedule reduced. 128 * The {@code quotaBytes} is a loose guideline b/c of metadata added by the backupmanager 129 * so apps should be more aggressive in trimming their backup set. 130 * 131 * @param backupDataBytes Expected or already processed amount of data. 132 * Could be less than total backup size if backup process was interrupted 133 * before finish of processing all backup data. 134 * @param quotaBytes Current amount of backup data that is allowed for the app. 135 * @param callbackBinder Binder on which to indicate operation completion. 136 */ 137 void doQuotaExceeded(long backupDataBytes, long quotaBytes, IBackupCallback callbackBinder); 138 139 /** 140 * Restore a single "file" to the application. The file was typically obtained from 141 * a full-backup dataset. The agent reads 'size' bytes of file content 142 * from the provided file descriptor. 143 * 144 * @param data Read-only pipe delivering the file content itself. 145 * 146 * @param size Size of the file being restored. 147 * @param type Type of file system entity, e.g. FullBackup.TYPE_DIRECTORY. 148 * @param domain Name of the file's semantic domain to which the 'path' argument is a 149 * relative path. e.g. FullBackup.DATABASE_TREE_TOKEN. 150 * @param path Relative path of the file within its semantic domain. 151 * @param mode Access mode of the file system entity, e.g. 0660. 152 * @param mtime Last modification time of the file system entity. 153 * @param token Opaque token identifying this transaction. This must 154 * be echoed back to the backup service binder once the agent is 155 * finished restoring the application based on the restore data 156 * contents. 157 * @param callbackBinder Binder on which to indicate operation completion, 158 * passed here as a convenience to the agent. 159 */ 160 void doRestoreFile(in ParcelFileDescriptor data, long size, 161 int type, String domain, String path, long mode, long mtime, 162 int token, IBackupManager callbackBinder); 163 164 /** 165 * Provide the app with a canonical "all data has been delivered" end-of-restore 166 * callback so that it can do any postprocessing of the restored data that might 167 * be appropriate. This is issued after both key/value and full data restore 168 * operations have completed. 169 * 170 * @param token Opaque token identifying this transaction. This must 171 * be echoed back to the backup service binder once the agent is 172 * finished restoring the application based on the restore data 173 * contents. 174 * @param callbackBinder Binder on which to indicate operation completion, 175 * passed here as a convenience to the agent. 176 */ 177 void doRestoreFinished(int token, IBackupManager callbackBinder); 178 179 /** 180 * Out of band: instruct the agent to crash within the client process. This is used 181 * when the backup infrastructure detects a semantic error post-hoc and needs to 182 * pass the problem back to the app. 183 * 184 * @param message The message to be passed to the agent's application in an exception. 185 */ 186 void fail(String message); 187 } 188
