Test the RMS listener methods : Database Persistence « J2ME « Java
Test the RMS listener methods
/*--------------------------------------------------
* RmsListener.java
*
* Test the RMS listener methods
*
* No GUI interface, all output is to the console
*
* Example from the book: Core J2ME Technology
* Copyright John W. Muchow http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.rms.*;
public class RmsListener extends MIDlet
{
private RecordStore rs = null;
static final String REC_STORE = "db_8";
public RmsListener()
{
// Open record store and add listener
openRecStore();
rs.addRecordListener(new TestRecordListener());
// Initiate actions that will wake up the listener
writeRecord("J2ME and MIDP");
updateRecord("MIDP and J2ME");
deleteRecord();
closeRecStore(); // Close record store
deleteRecStore(); // Remove the record store
}
public void destroyApp( boolean unconditional )
{
}
public void startApp()
{
// There is no user interface, go ahead and shutdown
destroyApp(false);
notifyDestroyed();
}
public void pauseApp()
{
}
public void openRecStore()
{
try
{
// The second parameter indicates that the record store
// should be created if it does not exist
rs = RecordStore.openRecordStore(REC_STORE, true);
}
catch (Exception e)
{
db(e.toString());
}
}
public void closeRecStore()
{
try
{
rs.closeRecordStore();
}
catch (Exception e)
{
db(e.toString());
}
}
public void deleteRecStore()
{
if (RecordStore.listRecordStores() != null)
{
try
{
RecordStore.deleteRecordStore(REC_STORE);
}
catch (Exception e)
{
db(e.toString());
}
}
}
public void writeRecord(String str)
{
byte[] rec = str.getBytes();
try
{
rs.addRecord(rec, 0, rec.length);
}
catch (Exception e)
{
db(e.toString());
}
}
public void updateRecord(String str)
{
try
{
rs.setRecord(1, str.getBytes(), 0, str.length());
}
catch (Exception e)
{
db(e.toString());
}
}
public void deleteRecord()
{
try
{
rs.deleteRecord(1);
}
catch (Exception e)
{
db(e.toString());
}
}
/*--------------------------------------------------
* Simple message to console for debug/errors
* When used with Exceptions we should handle the
* error in a more appropriate manner.
*-------------------------------------------------*/
public void db(String str)
{
System.err.println("Msg: " + str);
}
}
/*--------------------------------------------------
* Listen for updates to the record store
*-------------------------------------------------*/
class TestRecordListener implements RecordListener
{
public void recordAdded(RecordStore recordStore, int recordId)
{
try
{
System.out.println("Record with ID#: " + recordId +
" added to RecordStore: " + recordStore.getName());
}
catch (Exception e)
{
System.err.println(e);
}
}
public void recordDeleted(RecordStore recordStore, int recordId)
{
try
{
System.out.println("Record with ID#: " + recordId +
" deleted from RecordStore: " + recordStore.getName());
}
catch (Exception e)
{
System.err.println(e);
}
}
public void recordChanged(RecordStore recordStore, int recordId)
{
try
{
System.out.println("Record with ID#: " + recordId +
" changed in RecordStore: " + recordStore.getName());
}
catch (Exception e)
{
System.err.println(e);
}
}
}
