/**
* Set the memory layout to store something into a shared memory
* segment. The layout should always follow the regular expression
* '[variable][serialize($sth)]'. If the layout differs, e.g. if
* one wants to implement anything more complex like a group chat
* this layout needs to be adjusted to an regular expression like
* '[from_uid][to_uid][msg_type][serialize(message)]'.
* Some examples on how to use this function
* <pre>
* set_shm_seg_layout(array("[a-z]+", "[^\\[\\]]"));
* set_shm_seg_layout(array("[a-z]+", "[1-9]+[0-9]*", "[^\[\]]+"));
* </pre>
* The last should always be something like '[^\[\]]+' as the last
* element stored in a shared memory segment belonging to this layout
* should be a serialized object/variable which MUST NOT contain the
* encapsulators defined above.
*/
public function set_shm_seg_layout($lparams = array())
{
// set the layout parameters if
if (strncmp(gettype($lparams), "array", 5) == 0 && count($lparams) > 2) {
foreach ($lparams as $lp) {
$this->shm_seg_layout = $this->shm_seg_layout . StringUtil::escape($this->shm_seg_var_eleft) . $lp . StringUtil::escape($this->shm_seg_var_eright);
}
$this->shm_seg_layout = $this->shm_seg_layout . $this->shm_seg_var_delimiter;
// otherwise set the default layout to simply store variables
} else {
// default layout looks like '[varname][varvalue]'
$this->shm_seg_layout = $this->shm_seg_layout . StringUtil::escape($this->shm_seg_var_eleft) . "[a-z]+" . StringUtil::escape($this->shm_seg_var_eright) . StringUtil::escape($this->shm_seg_var_eleft) . "[^" . StringUtil::escape($this->shm_seg_var_eleft) . StringUtil::escape($this->shm_seg_var_eright) . "]*" . StringUtil::escape($this->shm_seg_var_eright) . $this->shm_seg_var_delimiter;
}
}
