NAME

POE::Component::WWW::Google::PageRank - A non-blocking wrapper for WWW::Google::PageRank

SYNOPSIS

use strict;
use warnings;

use POE qw(Component::WWW::Google::PageRank);

my $poco
    = POE::Component::WWW::Google::PageRank->spawn( alias => 'ranker' );

POE::Session->create(
    package_states => [
        'main' => [
            qw( _start got_rank )
        ],
    ],
);

$poe_kernel->run;

sub _start {
    $poe_kernel->post( ranker => rank => {
            page => 'http://zoffix.com',
            event   => 'got_rank',
            _random => 'foos',
        }
    );
}

sub got_rank {
    my ( $kernel, $result ) = @_[ KERNEL, ARG0 ];
    
    if ( $result->{error} ) {
        print "ZOMG! An error: $result->{error}\n";
    }
    else {
        print "The rank for $result->{page} is $result->{rank}\n";
    }
    
    print "Oh, BTW: $result->{_random}\n";
    
    $poco->shutdown;
}

DESCRIPTION

Module is a simple non-blocking POE wrapper around WWW::Google::PageRank

CONSTRUCTOR

my $poco = POE::Component::WWW::Google::PageRank->spawn;

POE::Component::WWW::Google::PageRank->spawn( alias => 'ranker' );

Takes three optional arguments:

alias

POE::Component::WWW::Google::PageRank->spawn( alias => 'ranker' );

Specifies a POE Kernel alias for the component

options

POE::Component::WWW::Google::PageRank->spawn(
    options => {
        trace => 1,
        default => 1,
    },
);

A hashref of POE Session options to pass to the component's session.

debug

POE::Component::WWW::Google::PageRank->spawn( debug => 1 );

When set to a true value turns on output of debug messages.

METHODS

These are the object-oriented methods of the components.

rank

$poco->rank( {
        page  => 'http://zoffix.com',
        event => 'got_rank',
    }
);

Takes hashref of options. See rank event below for description.

session_id

my $ranker_id = $poco->session_id;

Takes no arguments. Returns component's session ID.

shutdown

$poco->shutdown;

Takes no arguments. Shuts down the component.

ACEPTED EVENTS

rank

$poe_kernel->post( ranker => rank => {
        page          => 'http://zoffix.com',
        event         => 'got_rank',
        session       => $some_other_session,
        _random       => 'foos',
        options       => {
            ua      => 'Better not touch this',
            timeout => 10,
        }
    }
);

Instructs the component to get a page rank. Options are passed in a hashref with keys as follows:

page

{ page => 'http://zoffix.com' }

Mandatory. The page for which we need to get the rank.

event

{ event => 'got_rank' }

Mandatory. An event to send the result to.

session

{ session => $some_other_session_ref }

{ session => 'some_alias' }

{ session => $session->ID }

Optional. An alternative session alias, reference or ID that the response should be sent to, defaults to sending session.

options

{ options => { timeout => 10 } }

Optional. The value must be a hashref and these options will go directly to WWW::Google::PageRank new() method. See documentation for WWW::Google::PageRank for more information.

user defined

Optional. Any keys starting with _ (underscore) will not affect the component and will be passed back in the result intact.

shutdown

$poe_kernel->post( ranker => 'shutdown' );

Takes no arguments. Tells the component to shut itself down.

OUTPUT

sub got_rank {
    my ( $kernel, $result ) = @_[ KERNEL, ARG0 ];
    
    if ( $result->{error} ) {
        print "ZOMG! An error: $result->{error}\n";
    }
    else {
        print "The rank for $result->{page} is $result->{rank}\n";
    }
    
    print "Oh, BTW: $result->{_random}\n";
    
    $poco->shutdown;
}

The result will be posted to the event and (optional) session specified in the arguments to the rank (event or method). The result, in the form of a hashref, will be passed in ARG0. The keys of that hashref are as follows

rank

print "Rank is: $result->{rank}\n";

The rank key will contain the page rank of the page passed to rank event/method (note that the page is also in $result->{page}). If an error occured it will be undefined and error key will also be present.

error

if ( $result->{error} ) {
    print "Error while fetching :( $result->{error}\n";
}
else {
    print "Rank: $result->{rank}\n";
}

If an error occured during the query the error key will be present with LWP::UserAgent status_line()'s message.

response

print "The status of request: " .
    $result->{response}->status_line . "\n";

This key contains an HTTP::Response object returned by LWP::UserAgent when we were fetching for page rank.

user defined

print "$result->{_name}, the answer is $result->{out}\n";

Any arguments beginning with _ (underscore) passed into the calc event/method will be present intact in the result.

PREREQUISITES

Needs POE and WWW::Google::PageRank

BUGS

None that I know of.

SEE ALSO

POE WWW::Google::PageRank

AUTHOR

Zoffix Znet, <zoffix@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2008 by Zoffix Znet

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

cpanm POE::Component::WWW::Google::PageRank

perl -MCPAN -e shell
install POE::Component::WWW::Google::PageRank