Android Open Source - couchdbsyncer-android Syncer Service

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License

The source code is released under:
Apache License
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Java Source Code

package au.com.team2moro.couchdbsyncer;
//from w  w  w. j a va 2  s.c  o  m
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Observable;
import java.util.Observer;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

public abstract class SyncerService extends IntentService {
  private static final String TAG = "SyncerService";
  public static final String SYNCER_PROGRESS_INTENT = "au.com.team2moro.couchdbsyncer.SYNCER_PROGRESS";
  public static final String SYNCER_PROGRESS_DOCUMENTS = "documents";
  public static final String SYNCER_PROGRESS_ATTACHMENTS = "attachments";
  public static final String SYNCER_PROGRESS_OVERALL = "overall";
  public static final String SYNCER_FINISHED = "finished";
  public static final String SYNCER_SEQUENCE_ID = "sequenceId";
  
  private Syncer syncer;
  private Database database;
  
  public SyncerService() {
    super(TAG);

    Log.d(TAG, "SyncerService constructed");
  }
  
  /**
   * Get the connection settings to use to synchronize with the remote database.  Returns null by default
   * @return the connection settings
   */
  protected ConnectionSettings getConnectionSettings() {
    return null;
  }
  
  /**
   * Get the database store to synchronize.
   * @return the DatabaseStore object to sync
   */
  protected abstract DatabaseStore getDatabaseStore();
  
  /**
   * Get the database to synchronize.  This is initialised based on the "database_name" string extra sent to the IntentService.
   * @return the Database to sync
   */
  protected Database getDatabase() {
    return database;
  }
  
  /**
   * Get the download policy implementation for this sync. Returns null by default
   * @return An object implementing StoreDownloadPolicy
   */
  protected DownloadPolicy getDownloadPolicy() {
    return null;
  }
  
  /**
   * Runs Syncer against the database. Broadcast Intents are sent regularly with details of sync progress.
   */
  @Override
  protected void onHandleIntent(Intent arg0) {
    String dbname = arg0.getStringExtra("database_name");
    DatabaseStore dbstore = getDatabaseStore();
    if(dbstore == null) {
      Log.d(TAG, "database store not defined");
      return;
    }
    database = dbstore.getDatabase(dbname);
    if(database == null) {
      // database not found, return
      Log.d(TAG, "database " + dbname + " not found");
      return;
    }

    try {
      syncer = new Syncer(dbstore, database, getConnectionSettings());
      syncer.addObserver(new SyncerObserver());
      syncer.update(getDownloadPolicy());
      syncer.deleteObservers();
    } catch(Exception e) {
      Log.d(TAG, "syncer error: " + getStackTraceAsString(e));
      //send a broadcast so they know its failed
      Intent intent = new Intent(SYNCER_PROGRESS_INTENT);
      intent.putExtra(SYNCER_FINISHED, true);
      sendBroadcast(intent);
    }
  }

  private class SyncerObserver implements Observer {
    
    public void update(Observable arg0, Object arg1) {
      // broadcast syncer progress
      Intent intent = new Intent(SYNCER_PROGRESS_INTENT);
      intent.putExtra(SYNCER_PROGRESS_DOCUMENTS, syncer.getProgressDocuments());
      intent.putExtra(SYNCER_PROGRESS_ATTACHMENTS, syncer.getProgressAttachments());
      intent.putExtra(SYNCER_PROGRESS_OVERALL, syncer.getProgress());
      intent.putExtra(SYNCER_FINISHED, syncer.isFinished());
      intent.putExtra(SYNCER_SEQUENCE_ID, database.getSequenceId());
      sendBroadcast(intent);
    }
  }
  
  private String getStackTraceAsString(Exception exception) { 
    StringWriter sw = new StringWriter(); 
    PrintWriter pw = new PrintWriter(sw); 
    pw.print(" [ "); 
    pw.print(exception.getClass().getName()); 
    pw.print(" ] "); 
    pw.println(exception.getMessage()); 
    exception.printStackTrace(pw); 
    return sw.toString(); 
  }
}
Java Source Code List
