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.\" ========================================================================
.\"
.IX Title "Message::Passing::Role::Filter 3pm"
.TH Message::Passing::Role::Filter 3pm "2012-08-22" "perl v5.18.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Message::Passing::Role::Filter \- Simple abstraction for filtering messages
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    package My::Filter;
\&    use Moo;
\&    use namespace::clean \-except => \*(Aqmeta\*(Aq;
\&
\&    with \*(AqMessage::Passing::Role::Filter\*(Aq;
\&
\&    sub filter {
\&        my ($self, $message) = @_;
\&        # Do something with $message
\&        return $message; # Or return undef to halt message!
\&    }
\&
\&    1;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Both a producer and a consumer of messages, able to filter out messages based upon their contents,
or permute the structure of messages.
.SH "REQUIRED METHODS"
.IX Header "REQUIRED METHODS"
.SS "filter"
.IX Subsection "filter"
Called to filter the message. Returns the mangled message.
.PP
Note if you return undef then the message is not propagated further up the chain, which may be used
for filtering out unwanted messages.
.SH "REQUIRED ATTRIBUTES"
.IX Header "REQUIRED ATTRIBUTES"
.SS "output_to"
.IX Subsection "output_to"
From Message::Passing::Role::Input.
.SH "METHODS"
.IX Header "METHODS"
.SS "consume"
.IX Subsection "consume"
Consumers a message, calling the filter method provided by the user with the message.
.PP
In the case where the filter returns a message, outputs the message to the next step in the chain.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "Message::Passing" 4
.IX Item "Message::Passing"
.PD 0
.IP "Message::Passing::Manual::Concepts" 4
.IX Item "Message::Passing::Manual::Concepts"
.PD
.SH "SPONSORSHIP"
.IX Header "SPONSORSHIP"
This module exists due to the wonderful people at Suretec Systems Ltd.
<http://www.suretecsystems.com/> who sponsored its development for its
VoIP division called SureVoIP <http://www.surevoip.co.uk/> for use with
the SureVoIP \s-1API \- \s0
<http://www.surevoip.co.uk/support/wiki/api_documentation>
.SH "AUTHOR, COPYRIGHT AND LICENSE"
.IX Header "AUTHOR, COPYRIGHT AND LICENSE"
See Message::Passing.