Android Open Source - sana Queue Manager

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License

The source code is released under:

Copyright (c) 2010, Moca All rights reserved. The source code for Moca is licensed under the BSD license as follows: Redistribution and use in source and binary forms, with or without modification, ...

Java Source Code

package org.moca.service;
/*  w ww  .j  a v  a 2  s . c o m*/
import java.util.Collection;
import java.util.PriorityQueue;

import org.moca.db.MocaDB.SavedProcedureSQLFormat;

import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.util.Log;

public class QueueManager {
  private static final String TAG = QueueManager.class.toString();

  public static final int UPLOAD_STATUS_NOT_IN_QUEUE = -1;
  public static final int UPLOAD_STATUS_WAITING = 1;
  public static final int UPLOAD_STATUS_SUCCESS = 2;
  public static final int UPLOAD_STATUS_IN_PROGRESS = 3;
  public static final int UPLOAD_NO_CONNECTIVITY = 4;
  public static final int UPLOAD_STATUS_FAILURE = 5;
  public static final int UPLOAD_STATUS_CREDENTIALS_INVALID = 6;
  
  private static final String[] PROJECTION = { SavedProcedureSQLFormat._ID,
    SavedProcedureSQLFormat.GUID, SavedProcedureSQLFormat.PROCEDURE_ID,
    SavedProcedureSQLFormat.UPLOAD_QUEUE };
  
  /**
   * Initializes the in-memory queue with what is stored in the database.
   */
  public static PriorityQueue<Uri> initQueue(Context c) {
    PriorityQueue<Uri> queue = new PriorityQueue<Uri>();
    Cursor cursor = null;
    try {
      // Initialize the queue from the database
      Log.i(TAG, "In initQueue - getting queue from database");
      cursor = c.getContentResolver().query(
          SavedProcedureSQLFormat.CONTENT_URI, PROJECTION,
          SavedProcedureSQLFormat.UPLOAD_QUEUE + " >= 0", null,
          SavedProcedureSQLFormat.QUEUE_SORT_ORDER);
      cursor.moveToFirst();

      int position = 0;
      while (!cursor.isAfterLast()) {
        int savedProcedureId = cursor.getInt(0);
        Uri savedProcedureUri = ContentUris.withAppendedId(
            SavedProcedureSQLFormat.CONTENT_URI, savedProcedureId);
        Log.i(TAG, "Queue item #" + position + " has URI " + savedProcedureUri);
        queue.add(savedProcedureUri);
        cursor.moveToNext();
        position++;
      }
      Log.i(TAG, "Queue has been extracted from database. Here is the queue: " + queue);
    } catch (Exception e) {
      Log.e(TAG, "Exception in getting queue from database: "
          + e.toString());
      e.printStackTrace();
    } finally {
      if (cursor != null)
        cursor.deactivate();
    }
    return queue;
  }
  
  public static void updateQueueInDB(Context c, PriorityQueue<Uri> queue) {
    Log.i(TAG, "Updating queue information in the database");
    Log.i(TAG, "Queue is now: " + queue.toString());
    
    // Reset all saved procedure to have -1 for UPLOAD_QUEUE. This takes
    // everything out of the queue, then we re-add everything that is in the
    // in-memory queue.
    ContentValues cv = new ContentValues();
    cv.put(SavedProcedureSQLFormat.UPLOAD_QUEUE, -1);
    c.getContentResolver().update(SavedProcedureSQLFormat.CONTENT_URI, cv, null, null);
    
    // TODO(XXX) This loop is inefficient -- O(n^2) when it could be O(n)
    for (Uri procedureUri : queue) {
      cv = new ContentValues();
      int index = queueIndex(queue, procedureUri);
      Log.i(TAG, "In updateQueueInDB, queueIndex(" + procedureUri
          + ") returns: " + index);
      cv.put(SavedProcedureSQLFormat.UPLOAD_QUEUE, index);
      c.getContentResolver().update(procedureUri, cv, null, null);
    }
  }
  
  public static void addToQueue(Context c, PriorityQueue<Uri> queue, Uri procedureUri) {
    queue.add(procedureUri);
    setProcedureUploadStatus(c, procedureUri, UPLOAD_STATUS_WAITING);
    updateQueueInDB(c, queue);
  }
  
  public static boolean removeFromQueue(Context c, PriorityQueue<Uri> queue, Uri procedureUri) {
    return removeFromQueue(c, queue, procedureUri, QueueManager.UPLOAD_STATUS_NOT_IN_QUEUE);
  }
  
  
  public static boolean removeFromQueue(Context c, PriorityQueue<Uri> queue, Uri procedureUri, int newStatus) {
    if (QueueManager.isInQueue(queue, procedureUri)) {
      queue.remove(procedureUri);
      QueueManager.updateQueueInDB(c, queue);
      QueueManager.setProcedureUploadStatus(c, procedureUri, newStatus);
      return true;
    }
    return false;
  }

  public static boolean isInQueue(PriorityQueue<Uri> queue, Uri procedureUri) {
    return queue.contains(procedureUri);
  }

  public static int queueIndex(PriorityQueue<Uri> queue, Uri procedureUri) {
    if (isInQueue(queue, procedureUri)) {
      int index = 0;
      for (Uri uri : queue) {
        if (uri.equals(procedureUri)) {
          return index;
        }
        index++;
      }
    }
    return -1;
  }
  
  public static void setProcedureUploadStatus(Context c, Uri procedureUri, int status) {
    Log.v(TAG, "Setting upload status for " + procedureUri + " to " + status);
    ContentValues cv = new ContentValues();
    cv.put(SavedProcedureSQLFormat.UPLOAD_STATUS, status); 
    c.getContentResolver().update(procedureUri, cv, null, null); 
  }

  public static void setProceduresUploadStatus(Context c, Collection<Uri> procedureUris, int status) {
    ContentValues cv = new ContentValues();
    cv.put(SavedProcedureSQLFormat.UPLOAD_STATUS, status);
    for (Uri uri : procedureUris) {
      c.getContentResolver().update(uri, cv, null, null);
    }
  }

}

Java Source Code List

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