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POAppEngine Persist object delay?
 

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    <p>My situation is as followed:<br> I have a list of Session in my table. <BR> In my code i do a check if the last Session in the datastore has room for an aditional player.<BR> If not create a new Session.</p> <p>It goes a little something like this:</p> <pre><code>public Session getEligeableSession(){ Session session; session = ds.getLastSession(); if(session.numPlayers &gt; 3){ newSession(); session = ds.getLastSession(); } return session; } </code></pre> <p>This works flawlessly on local but it doesn't on AppEngine's AppSpot.<br> On AppSpot i just get a filled up session back , i have to conclude from this that my code doesn't wait for the new session to get fully persisted and just get's the old session again.</p> <p>Is my conclusion right? if so how would i go about solving this graciously.<BR> Searching for this 'delay' has resulted in nothing on Google/SO which makes me believe there is no such a thing(aka it's synchronous) and there is a different fail in my code.(perhaps getting the last object from the list works differently on AppEngine)</p> <p>Any and all help/advice is much appreciated.</p> <p>Summary:</p> <p>Session(Object) has(List) 4 Players(Object) <BR> <B>getLastSession()</B> retrieves the whole list from the datastore and get the last one(<I>size-1</I>).<BR> <B>newSession()</B> creates a new Session object and persists it.</p> <p>EDIT per request:</p> <pre><code>public List&lt;Session&gt; getAll(){ pm = PMF.get().getPersistenceManager(); String query = "select from " + Session.class.getName(); @SuppressWarnings("unchecked") List&lt;Session&gt; sessions = (List&lt;Session&gt;) pm.newQuery(query).execute(); return sessions; } public Session getLastSession(){ List&lt;Session&gt; sessions = getAll(); Session session = sessions.get(sessions.size()-1); session.activeGame = session.numPlayers == 4 ? true : false; pm.close(); return session; } public int insert(Session session){ pm = PMF.get().getPersistenceManager(); int status = 0; try { pm.makePersistent(session); } finally { pm.close(); } return status; } </code></pre> <p>The code seems 'Reasonable', no funny stuff happening afaik. I'm using the master-slave option.</p>
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    1. USRohan
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    1. COWhat's the implementation of newSession and getLastSession? Actual code is important here! And, are you using the high-replication datastore?
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      1. USNick Johnson
    2. CO@Nick Johnson I've updated my post as requested. Forgot: NewSession is just insert(new Session);
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      1. USRohan
    3. COHave you tried passing in a single persistence manager to all functions, rather than creating a new one in each?
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      1. USNick Johnson
 

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