Component development: Cache questions - Joomla! Forum - community, help and support

i've searched , searched , struggled find resource explaining how use joomla's caching system.

can recommend resource reading how start using joomla's cache?

i'm developing component , want cache single view. view returns json object , can take little while (10 seconds~) complete, prime candidate caching. i've got working, seems ignoring 'setlifetime' value i'm setting.

i won't post entire code, basics of following:

view.json.php
pulls javascript object model, json encodes , echoes browser.

with no cache, relevant code looked like:

code: select all

$result = $this->get('something');
echo json_encode($result);


i've managed cache working changing to:

code: select all

        $cache = & jfactory::getcache();
        $cache->setcaching(1);
        $cache->setlifetime(5);

        $result =  $cache->call(array($this, 'get'), 'something'');
        echo json_encode($result);


now, above works, sort of. output of function cached , it's much, quicker because of it. ignores 'setlifetime'. in example above, i've set 5, in actual code it's pulling in value component parameters equivalent 3 days (3 * 60 * 24).

however, after few minutes if try reloading page (that calls function) re-executes function without using cache.

what doing wrong?

thanks help,

tom