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PHP MongoCursor::tailable

PHP original manual for MongoCursor::tailable [ show | php.net ]

MongoCursor::tailable

(PECL mongo >=0.9.4)

MongoCursor::tailable — Sets whether this cursor will be left open after fetching the last results

Description

public MongoCursor MongoCursor::tailable ([ bool $tail = TRUE ] )

Mongo has a feature known as tailable cursors which are similar to the Unix "tail -f" command.

Tailable means cursor is not closed when the last data is retrieved. Rather, the cursor marks the final object's position. you can resume using the cursor later, from where it was located, if more data were received.

Like any "latent cursor", the cursor may become invalid at some point -- for example if that final object it references were deleted. Thus, you should be prepared to requery if the cursor is MongoCursor::dead().

Parameters

tail

If the cursor should be tailable.

Return Values

Returns this cursor.

Errors/Exceptions

Throws MongoCursorException if this cursor has started iterating.

Examples

Example #1 MongoCursor::tailable() example

<?php

$cursor = $collection->find()->tailable();

$results = array();

while (1) {
    if (!$cursor->hasNext()) {
        // we've read all the results, exit
        if ($cursor->dead()) {
            break;
        }
        // read all results so far, wait for more
        sleep(10);
    }
    else {
        $results[] = $cursor->getNext();
    }
}

?>

See Also

MongoDB core docs on » tailable cursors.