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Manual Reference Pages  -  SCRAPPY::QUEUE (3)

.ds Aq ’

NAME

Scrappy::Queue - Scrappy HTTP Request Flow-Control System

CONTENTS

VERSION

version 0.94112090

SYNOPSIS



    #!/usr/bin/perl
    use Scrappy::Queue;

    my  $queue = Scrappy::Queue->new;
   
        $queue->add($url);
       
        while (my $url = $queue->next) {
            ... $queue->add(...);
        }



DESCRIPTION

Scrappy::Queue provides a system for saving URLs to a recordset/queue and iterating of them using the Scrappy framework.

METHODS

    list

The list method return the list of URLs in the queue. This is returned in list context.



    my  $queue = Scrappy::Queue->new;
   
    ...
   
    my  @list = $queue->list;



    add

The add method adds new URLs to the queue. Duplicate URLs will be ignored.



    my  $queue = Scrappy::Queue->new;
        $queue->add($url);



    clear

The clear method completely empties the queue and resets the cursor (loop position).



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
   
        $queue->clear;



    reset

The reset method resets the cursor (loop position).



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        while (my $url = $queue->next) {
            $queue->reset if ...; # beware the infinate loop
        }
       
        $queue->reset;



    current

The current method returns the URL in the current loop position.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        while (my $url = $queue->next) {
            last if ...;
        }
       
        print great if $url eq $queue->current;



    next

The next method moves the cursor to the next loop position and returns the URL.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        while (my $url = $queue->next) {
            ...
        }



    previous

The previous method moves the cursor to the previous loop position and returns the URL.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        while (my $url = $queue->next) {
            ...
        }
       
        print $queue->previous;



    first

The first method moves the cursor to the first loop position and returns the URL.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        print $queue->first;



    last

The last method moves the cursor to the last loop position and returns the URL.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        print $queue->last;



    index

The index method moves the cursor to the specified loop position and returns the URL. The loop position is a standard array index position.



    my  $queue = Scrappy::Queue->new;
   
        $queue->add(...);
        $queue->add(...);
        $queue->add(...);
       
        print $queue->index(1);



    cursor

The cursor method returns the current loop position.



    my  $queue = Scrappy::Queue->new;
        print $queue->cursor;



AUTHOR

Al Newkirk <awncorp@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by awncorp.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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perl v5.20.3 SCRAPPY::QUEUE (3) 2011-07-28

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