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POImplementing news feed on GAE - Should I use Prospective Search?
 

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    <p>I have an issue i'm struggling with for some time now. Im trying to implement a news feed feature in my app using GAE cloud endpoints and java. The common concept is of followers and followees, where an action of a followee can be seen by his followers. A new follower should also see his followees past actions, not only from the time he started following.</p> <p>I made a few tries with the following components. Each try worked great but was lacking something:</p> <ol> <li>On each user action i added a 'log' entity into the datastore with the user id included. When a user was displaying his news feed i just queried for all those entities by their user ids according to the user's followees list. Everything was fine until i realized that a 'IN' query cannot be cursored. So this option was gone.</li> <li>On this try, which is also the current state of the application, im using the Search API. Upon every user action im not storing a 'log' entity into the datastore anymore but a document into a search index. Complex queries can be cursored here and the world is smiling again. But... im not too sure that, billing wise, this is a smart descision. It seems that the costs of searching/adding/deleting documents along side the <a href="https://developers.google.com/appengine/docs/java/search/#Java_Search_API_quotas_and_pricing" rel="nofollow noreferrer">documented </a>daily limitations is making the whole thing a bit too sketchy.</li> <li>The next try should be Prospective Search API. From what i'm reading in the <a href="https://developers.google.com/appengine/docs/java/prospectivesearch/" rel="nofollow noreferrer">documents</a> it seems the right component to pick for that purpose. Unfortunately, the documentation is really poor and give very little examples. Also the billing information is unclear.</li> </ol> <p>So im asking for the advice of the stackoverflow community. Can you please advise me about this matter ? and if Prospective Search is the right option to choose, can you please provide some clear sample java code that uses cloud endpoints?</p> <p><strong>EDIT :</strong> Just to emphasize the main design requirement here - The news feed feature need to have the ability to fetch sorted followees actions using a cursor (in order avoid querying the whole batch).</p>
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