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crypt::random::source::base::handle

Crypt::Random::Source::Base::Handle(3pm)		User Contributed Perl Documentation		  Crypt::Random::Source::Base::Handle(3pm)

NAME

       Crypt::Random::Source::Base::Handle - IO::Handle based random data sources

SYNOPSIS

	   use Moose;
	   extends qw(Crypt::Random::Source::Base::Handle);

	   sub open_handle {
	       # invoked as needed
	   }

	   # this class can also be used directly
	   Crypt::Random::Source::Base::Handle->new( handle => $file_handle );

	   # it supports some standard methods:

	   $p->blocking(0);

	   $p->read( my $buf, $n ); # no error handling here

DESCRIPTION

       This is a concrete base class for all IO::Handle based random data sources.

       It implements error handling

ATTRIBUTES

   handle
       An IO::Handle or file handle to read from.

   blocking
       This is actually handled by "handle", and is documented in IO::Handle.

   allow_under_read
       Whether or not under reading is considered an error.

       Defaults to false.

   reread_attempts
       The number of attempts to make at rereading if the handle did not provide enough bytes on the first attempt.

       Defaults to 1.

       Only used if "allow_under_read" is enabled.

METHODS

   get
       See "get" in Crypt::Random::Source::Base.

       When "blocking" or "allow_under_read" are set to a true value this method may return fewer bytes than requested.

   read
       This delegates directly to "handle".

       It DOES NOT provide the same validation as "get" would have, so no checking for underreads is done.

   close
       Close the handle and clear it.

   _read
       "$self->handle->read" but with additional error checking and different calling conventions.

   _read_too_short
       Called by "_read" when not enough data was read from the handle. Normally it will either die with an error or attempt to reread. When
       "allow_under_read" is true it will just return the partial buffer.

   open_handle
       Abstract method, should return an IO::Handle to use.

AUTHOR

	 Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2011 by Yuval Kogman.

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

perl v5.14.2							    2011-01-05				  Crypt::Random::Source::Base::Handle(3pm)

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