Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Troubleshooting Guide Page 66
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BlackBerry Java Development Environment Development Guide
Manage persistent data
Data integrity To maintain the integrity of data in persistent storage, partial updates are not made if an error occurs during
a commit. Data in the
PersistentObject retains the values from the last commit in order to preserve data
integrity.
If the JVM performs an emergency garbage collection operation due to low memory, outstanding transactions
are committed immediately to avoid compromising data integrity. If the BlackBerry device fails during this
operation, partially completed transactions are committed when the BlackBerry device starts. Outstanding
transactions are not committed during a normal garbage collection operation.
Task Steps
Create a unique long key. Each PersistentObject has a unique long key.
1. In the BlackBerry® Integrated Development Environment, type a string value, such as
com.rim.samples.docs.userinfo.
2. Select this string.
3. Right-click this string and click Convert ‘com.rim.samples.docs.userinfo’ to long.
4. Include a comment in your code to indicate the string that you used to generate the unique long key.
Create a persistent data
store.
1. Create a single static PersistentObject.
static PersistentObject store;
2. Invoke PersistentStore.getPersistentObject, using the unique long key as a parameter.
static {
store = PersistentStore.getPersistentObject( 0xa1a569278238dad2L );}
Store an object persistently. 1. Invoke setContents() on a PersistentObject. This method replaces existing content with the new
content.
2. To save the new content to the persistent store, invoke commit().
String[] userinfo = {username, password};
synchronized(store) {
store.setContents(userinfo);
store.commit();}
Store objects in a batch
transaction.
1. To use a batch transaction to commit objects to the persistent store, invoke
PersistentStore.getSynchObject(). This method retrieves the persistent store monitor that locks
the object.
2. Synchronize on the object.
3. Invoke commit() as necessary. If any commit in the batch fails, the entire batch transaction fails.
Commit a monitor object
separately from a batch
transaction.
>Invoke forceCommit() while synchronizing the monitor object.
Feature Description
- BlackBerry Java Development 1
- Environment 1
- Contents 5
- Creating UIs 13
- UI components 14
- Create a screen 15
- Creating custom UI components 17
- Create a custom field 18
- 1: Creating UIs 19
- Create custom context menus 26
- Create custom layout managers 29
- Example: DiagonalManager.java 30
- return index; 32
- Create custom lists 33
- Create a menu item 36
- Register a menu item 36
- Example: DemoAppMenuItem.java 37
- Arrange UI components 38
- Respond to UI events 40
- Manage foreground events 43
- Manage drawing areas 43
- Using graphics and multimedia 45
- Use encoded images 46
- Example: ImageDemo.java 47
- Drawing and rendering images 48
- Example: DrawDemo.java 50
- Using audio 51
- Example: Sequence of tones 52
- Play media 54
- Using rich media 55
- Example: MediaSample.java 56
- Listen for rich media events 57
- Example: MediaSample2.java 60
- Storing data 65
- Manage persistent data 66
- 3: Storing data 67
- Example: UserInfo.java 67
- Manage custom objects 69
- Example: Restaurants.java 71
- Use the MIDP record store 75
- Managing data 77
- Backing up and restoring data 78
- 4: Managing data 79
- Access a SyncCollection 80
- Using SyncObjects 82
- Example: RestaurantsSync.java 89
- Using smart cards 97
- 5: Using smart cards 101
- Managing memory 115
- Use the LMM 116
- Free persistent objects 116
- Creating connections 117
- Use HTTP connections 118
- Example: HTTPFetch.java 119
- 7: Creating connections 119
- Use HTTP authentication 122
- Use HTTPS connections 125
- Use socket connections 125
- Datagram connections 126
- Using port connections 128
- Creating notifications 135
- Add a new event source 136
- Code sample: 137
- Triggering events 139
- Respond to deferred events 140
- Cancel events 141
- 8: Creating notifications 143
- Example: ConsequenceDemo.java 143
- Managing applications 147
- Managing code modules 149
- Retrieve module information 150
- Create code modules 150
- Runtime store 151
- Share runtime objects 151
- Create new messages 153
- Work with a message 155
- Send a message 156
- Reply to a message 157
- Work with folders 158
- Working with attachments 160
- Using PIM applications 163
- Use the calendar 164
- 11: Using PIM applications 165
- ContactsDemo.java 167
- Using the address book 170
- Example: ContactsDemo.java 175
- Using tasks 178
- Use tasks 179
- Using the phone application 185
- BlackBerry DTMF tones 186
- Listen for phone events 187
- Access and use call logs 187
- Example: PhoneLogsDemo.java 188
- Using the BlackBerry Browser 191
- Using location information 199
- Location document tags 200
- Location document structure 200
- Creating push applications 215
- Types of push requests 216
- Example: HTTPPushDemo.java 218
- Create a RIM push request 225
- Create a PAP push request 226
- BlackBerry device 227
- Localizing applications 235
- Add localization support 236
- 16: Localizing applications 237
- Example: CountryInfo.java 237
- Testing applications 245
- Debugging applications 246
- 17: Testing applications 247
- Manage a debugging session 248
- Locate a memory leak 250
- Display format 251
- View local variables 252
- View static data 252
- View threads 253
- View the call stack 254
- View event logs 254
- View classes 255
- Generate profile data 256
- Analyze code coverage 257
- Run the Coverage tool 258
- View source code 258
- Approve HTTP connections 258
- Load and remove applications 260
- View application information 261
- Preverify applications 263
- Request code signatures 265
- View signature status 266
- Distribute applications 267
- Software 269
- Specify optional components 270
- WAP Push DTDs 276
- Appendix: .alx files 277
- Appendix: .alx files 279
- Set .cod file dependencies 281
- Acronym list 283
- Published in Canada 286
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