Cache Library for Android

This is a wrapper that eases the use of Google's HttpResponseCache.

Usage

Components

• Cache - Class that you call to handle getting data.
• Serializer - Interface that your serializers will implement. Once you get data from the you need to turn that data into a java object, this class is where that happens.
• Cachable - Interface that your class will implement. You have urls that are endpoints to data you want to consume, you will have a class for every URL, or one enum that implements Cachable.

Serializer

This is where you want to convert server response into real java objects. This is an example where the server is returning JSON array of user objects.

public class UsersSerializer implements Serializer
{
  private ArrayList users;

  @Override
  public <T> T getData ()
  {
    return (T) users;
  }

  @Override
  public void decode (byte[] data)
  {
    users = new ArrayList<>();
    JSONTokener decoder = new JSONTokener(new String(data));
    try
    {
      JSONArray array = (JSONArray) decoder.nextValue();

      for (int i = 0; i < array.length(); i++)
      {
        User user = new User();
        JSONObject obj = (JSONObject) array.get(i);
        user.setName(obj.getString("name"));
        user.setEmail(obj.getString("email"));
        users.add(user);
      }
    }
    catch(JSONException e)
    {
      
    }
  }
}

Cachable

This is an example of how you can define your endpoints in a organized fashion.

public enum EndPoints implements Cachable
{
    USERS("http://example.com/users")
    {
        @Override
        public long expiration ()
        {
         return Cachable.ALWAYS;
        }
        
        @Override
        public Serializer getSerializer ()
        {
         return new UserSerializer();
        } 
    };
        
    public URL url ()
    {
        try
        {
          return new URL(url); 
        }
        catch(MalformedURLException e)
        {
          e.printStackTrace();
        }
        
        return null;
    }
  
    private final String url;
    
    public Dataset url (String s)
    {
      this.url = s;
      return this;
    }
}

Cache

First initialize, by installing a cache. This should really only be called once.

Cache.init(getApplicationContext());

Now you're ready to use it! The return of getData() is generic

EndPoints mCachableData = EndPoints.Users;
List<User> data = Cache.getInstance().getData(mCachableData);

Author

Name: Javier C

Email: javier@javierc.io