Added abstract service factory for logger component to provide several loggers for application.

[andrei-stsiapanau]

Added support for multiple loggers in application.
Configuration should be like this:

'logger' => array(
    'Backend\Logger' => array(
        'writers' => array(
            array(
                'name' => 'stream',
                'priority' => 1,
                'options' => array(
                    'stream' => __DIR__ . '/data/log/backend.log',
                ),
                'filters' => array(
                    array(
                        'name' => 'priority',
                        'options' => array(
                            'priority' => E_STRICT | E_WARNING | E_NOTICE
                        ),
                    ),
                ),
                'formatter' => array(
                    'name' => 'base',
                    'options' => 'Y-m-d H:i:s',
                ),
            ),
        ),
    ),
    'Frontend\Logger' => array(
        'writers' => array(
            array(
                'name' => 'stream',
                'priority' => 1,
                'options' => array(
                    'stream' => __DIR__ . '/data/log/frontend.log',
                ),
            ),
        ),
    ),
)

[blanchonvincent]

delete the "else", finish with "return false" without else

[andrei-stsiapanau]

@blanchonvincent done.

[blanchonvincent]

@Stephanoff ok, now you must add unit tests with the PR

[andrei-stsiapanau]

@blanchonvincent Test case added.

[weierophinney]

@Stephanoff This is brilliant. I'd like to see this approach adopted in more places, to be honest!

[localheinz]

Teset?

[steptom]

I have recently migrate to the 2.2.0 version of Zend Framework and I can't add a filters and formatter to the writer by using the configuration you give as example.
Is it normal ?

(It would be unfortunate to be able to create loggers without being able to specify filters and formatter)

[andrei-stsiapanau]

Hi @steptom,

Try to use 'log' section name instead of 'logger'.
It changes due to compatibility with LoggerServiceFactory.

[steptom]

Hi @Stephanoff ,
thanks for your answer, this allowed me to partially solve my problem.

In fact, the example has a lot of errors ;)
(For example the formatter and filters parameters are writer options)