(PECL mongo >=1.2.11)
Sets whether this cursor will wait for a while for a tailable cursor to return more data
public MongoCursor MongoCursor::awaitData ([ bool $wait = true ] )
This method is to be used with tailable cursors. If we are at the end of the data, block for a while rather than returning no data. After a timeout period, we do return as normal.
Parameters:
wait
If the cursor should wait for more data to become available.
Returns:
Returns this cursor.
Exception:
Throws MongoCursorException if this cursor has started iterating.
Examples:
MongoCursor::awaitData() example
In this example we tail the "oplog" and instead of sleeping during every iteration, we set the MongoCursor::awaitData() option. MongoCursor::hasNext() will now block until there is more data available.
<?php $m = new MongoClient( 'mongodb://localhost:13000', array( 'replSet' => 'seta' ) ); $c = $m->local->selectCollection( 'oplog.rs' ); $cursor = $c->find( array( 'ns' => 'demo.article', 'op' => 'i' ) ); $cursor->tailable( true ); $cursor->awaitData( true ); while (true) { if (!$cursor->hasNext()) { // we've read all the results, exit if ($cursor->dead()) { break; } } else { var_dump( $cursor->getNext() ); } } ?>
See also:
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