Zend log filter sample

[corentin-larose]

This filter is intended to sample events by a given factor for events intensive scripts.

Never forget this is a random based sampling, thus, you never exactly know which event will be logged.

Usage:

$logger = new Zend\Log\Logger();

$writer = new Zend\Log\Writer\Stream('/path/to/first/logfile');
$logger->addWriter($writer);

// No event is logged
$filter = new Zend\Log\Filter\Sample(0);
$writer->addFilter($filter);

// All events are logged
$filter = new Zend\Log\Filter\Sample(1);
$writer->addFilter($filter);

// 2 random events among 3 are logged
$filter = new Zend\Log\Filter\Sample(2/3);
$writer->addFilter($filter);

[coveralls]

Coverage remained the same when pulling 9530e34 on qapa:zend-log-filter-sample into 1166733 on zendframework:develop.

[coveralls]

Coverage remained the same when pulling 9530e34 on qapa:zend-log-filter-sample into 1166733 on zendframework:develop.

[coveralls]

Coverage remained the same when pulling 9530e34 on qapa:zend-log-filter-sample into 1166733 on zendframework:develop.

[corentin-larose]

I don't understand why Travis failed (only for PHP 5.3.3), it seems to be related to the test logic itself.

[weierophinney]

@corentin-larose The failure doesn't seem to be based on your test - the Log tests are passing. I'll review today.

[weierophinney]

We no longer underscore-prefix non-public members; I can change this during merge.