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I'm lost or just tired from guessing.

I need to make an hash I can call by hostname as the key and some random
amount of data after that as the values. now a hash works great for 1
to 1 maps (h[serverX] ==> result) but I need
h[serverX][query|result|time]

so how would I write a hash that would give me access to

in:
h[host_to_query]["query"]] = @query
h[host_to_query]["result"]] = queryhost(host_to_query,@query)

out:
for h.each |host| puts h[[host]["result"]]

thanks

zaq

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Alle venerd=C3=AC 30 marzo 2007, Zac Elston ha scritto:
> I'm lost or just tired from guessing.
>
> I need to make an hash I can call by hostname as the key and some random
> amount of data after that as the values. now a hash works great for 1
> to 1 maps (h[serverX] =3D=3D> result) but I need
> h[serverX][query|result|time]
>
> so how would I write a hash that would give me access to
>
> in:
> h[host_to_query]["query"]] =3D @query
> h[host_to_query]["result"]] =3D queryhost(host_to_query,@query)
>
> out:
> for h.each |host| puts h[[host]["result"]]
>
> thanks
>
> zaq

If I understand correctly, you can create a class with the required instanc=
es
variables (or use Struct or OpenStruct) and store query and result there. F=
or
instance, using OpenStruct:

require 'ostruct'

h[host_to_query] =3DOpenStruct.new(:query=3D> @query, :result=3D queryhost(=
host_to_query,@query)

then

h.each_value{|v| puts v.result}

=46or more information, you can look at the ri documentation for Hash, Stru=
ct=20
and OpenStruct (ri Hash, ri Struct, ri OpenStruct).

I hope this helps

Stefano

Zac Elston wrote:
> I'm lost or just tired from guessing.
>
> I need to make an hash I can call by hostname as the key and some random
> amount of data after that as the values. now a hash works great for 1
> to 1 maps (h[serverX] ==> result) but I need
> h[serverX][query|result|time]
>
> so how would I write a hash that would give me access to
>
> in:
> h[host_to_query]["query"]] = @query
> h[host_to_query]["result"]] = queryhost(host_to_query,@query)
>
> out:
> for h.each |host| puts h[[host]["result"]]
>
> thanks
>
> zaq
>
>
Hey Zac,

Would a nested hash do the trick?

hash = { :host1 => {
:query => @query,
:result => queryhost(...),
:time => time} }


then for output, you'd do something like
for hash.each_value do |value| puts value[:result] end

Hopefully that does the trick,
Keith

On 30.03.2007 18:54, Zac Elston wrote:
> I'm lost or just tired from guessing.
>
> I need to make an hash I can call by hostname as the key and some random
> amount of data after that as the values. now a hash works great for 1
> to 1 maps (h[serverX] ==> result) but I need
> h[serverX][query|result|time]
>
> so how would I write a hash that would give me access to
>
> in:
> h[host_to_query]["query"]] = @query
> h[host_to_query]["result"]] = queryhost(host_to_query,@query)

This is syntactically incorrect since oyu have one closing bracket too much.

> out:
> for h.each |host| puts h[[host]["result"]]

Here's an alternative:

Info = Struct.new :query, :result, :time
h = Hash.new {|h,k| h[k] = Info.new}
h[serverX].query = @query
h[serverX].result = queryhost(host_to_query,@query)
h.each {|ho,inf| puts inf.result}

Of course you can use Arrays instead of Info but the code with Info is
more readable and less error prone.

Kind regards

robert

first, thanks for the responses, ruby really is a great language.

My delima is that I'm trying to multithread the actions and store the
results in a hash with the hostname as key

to redefine the issue, for each host I need a thread and I expect a
result, then I'd like to be able to see the result in a
hash[host][result]

but I'm having trouble mixing the hash with the thread. maybe I'm going
about this all wrong. (this is outputting to a rails view, which is why
i have "@vars"

I have

@threads = []
@resulthash = Hash.new(0)
@hostarray.each do |host|
threads << Thread.new(host) do |myhost|
@resulthash = { :myhost => {
ackages => @mypackages,
:result => doXMLquery(host,@mypackages)} }
logger.info("host = " + host + ", result = " +
@resulthash[:myhost][:result])
end
end

@threads.each {|thr| thr.join }

logger.info("result of threads..")
@hostarray.each do |myhost|
logger.info("host = " + myhost + ", result = " +
@resulthash[:myhost][:result])
end

logger output

host = hostX, result = --data returned from hostX--
host = hostY, result = --data returned from hostY--
result of threads..
host = hostX, result = --data returned from hostY--
host = hostY, result = --data returned from hostY--

I'm clearly loosing context of the [:host][:result] in the final two
lines.

any pointers?

thanks
-zaq

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I used Openstruct and it appears to give me what I want. I'm still
interested in why a nested hash didn't work if anyone knows.

thanks again
-zaq

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