From: Robert Klemme <shortcutter@...>
Date: 2008-05-20T15:40:06+09:00
Subject: Re: how to serialize hash to a file?

On 20.05.2008 07:46, hurcan solter wrote:
> i have an xml file that goes like;
> 
> <objectClass name="EmitterBeam" >
> <attribute name="BeamElevationCenter" dataType="Float1"/>
> <attribute name="BeamIdentifier" dataType="HLAoctet"/>
> </objectClass>
> 
> at some point i need the look up the data type for different
> attributes.
> I can get the data type using a Xpath query in the form using REXML
> 
> node = $fom_file.elements["//attribute [@name = '#{attribute_name}']"]
> 
> it works okay, the thing is ,it takes ages (which is about ten
> seconds)
> 
> so I have a mind to cache the attribute-datatype pairs in a hash for
> faster lookup.
> So can you guys tell me a simple and elegant way to do serialize
> deserialize that hash to a file?
> TIA
> Hurcan Solter

irb(main):012:0> hash={1=>2}
=> {1=>2}
irb(main):013:0> hash.object_id
=> 1073423700
irb(main):014:0> File.open("foo", "wb") {|io| Marshal.dump(hash, io)}
=> #<File:foo (closed)>
irb(main):015:0> hash = File.open("foo", "rb") {|io| Marshal.load(io)}
=> {1=>2}
irb(main):016:0> hash.object_id
=> 134268870

Kind regards

	robert