zf2-cache-logger

A plugin for Zend\Cache\Storage which logs events (eg read/write/remove/exception) to a PSR-3 compliant logger. This can be useful for development, or to get an idea of your cache effectiveness if your cache adapter doesn't natively provide such information.

Options

EventLoggerOptions accepts the following:

logger

A PSR-3 compliant logger (eg monolog, Zend\Log)

activeListeners (optional, default all)

Classes of listeners which are active and will respond to events. Available classes are:

• EventLogger::LISTENERS_ALL (the default)
• EventLogger::LISTENERS_READ
• EventLogger::LISTENERS_WRITE
• EventLogger::LISTENERS_REMOVE
• EventLogger::LISTENERS_EXCEPTION

These options can be bitwise-OR'd to activate multiple classes of listeners.

Example usage

use Deakin\Zend\Cache\Storage\Plugin\EventLoggerOptions;
use Deakin\Zend\Cache\Storage\Plugin\EventLogger;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
use Zend\Cache\Storage\Adapter\Filesystem;

$logger = new Logger('cache-logger');
$log->pushHandler(new StreamHandler('path/to/your.log', Logger::INFO));
/* log write operations and exceptions only */
$options = new EventLoggerOptions(
    array(
        'logger' => $logger,
        'activeListeners' => EventLogger::LISTENERS_EXCEPTION | EventLogger::LISTENERS_WRITE,
    )
);

$eventLogger = new EventLogger();
$eventLogger->setOptions($options);

$cache = new Filesystem();
$cache->addPlugin($eventLogger);
$cache->addItem('key', 'value');

Output

Example logged output of a fairly standard missed read, successful write, successful read:

[2014-02-07 15:00:11] cache-logger.INFO: read miss {"operation":"read","success":"false","key":"F1B349595E0B2322E043BCE1440AB5A7","event":"getItem.post","adapter":"Zend\\Cache\\Storage\\Adapter\\Filesystem","namespace":"my.namespace"} []
[2014-02-07 15:00:11] cache-logger.INFO: write success {"operation":"write","key":"F1B349595E0B2322E043BCE1440AB5A7","success":"true","event":"setItem.post","adapter":"Zend\\Cache\\Storage\\Adapter\\Filesystem","namespace":"my.namespace","ttl":300} []
[2014-02-07 15:00:12] cache-logger.INFO: read hit {"operation":"read","success":"true","key":"F1B349595E0B2322E043BCE1440AB5A7","event":"getItem.post","adapter":"Zend\\Cache\\Storage\\Adapter\\Filesystem","namespace":"my.namespace"} []

Notes

• Messages are logged at INFO level, the exception being exceptions which are logged at ERROR level.
• Depending on your usage, logging READ operations can log a lot of messages