Class: OMF::SFA::AM::AMScheduler

Inherits:
Base::LObject
  • Object
show all
Defined in:
lib/omf-sfa/am/am_scheduler.rb

Overview

This class implements a default resource scheduler

Instance Method Summary collapse

Constructor Details

#initialize ⇒ AMScheduler

Returns a new instance of AMScheduler.



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# File 'lib/omf-sfa/am/am_scheduler.rb', line 139

def initialize()
  @nil_account = OMF::SFA::Resource::OAccount.new(:name => '__default__', :valid_until => Time.now + 1E10)
  @am_liaison = OMF::SFA::AM::AMLiaison.new
end

Instance Method Details

#create_resource(resource_descr, type_to_create, oproperties, authorizer) ⇒ OResource

Create a resource of specific type given its description in a hash. If the type or the resource is physical then we create a clone of itself and assign it to the user who asked for it (conceptually a physical resource even though it is exclusive, is never given to the user but instead we provide him a clone of the resource). If the type is a ‘lease’ then we normally create a lease object.

Parameters:

  • resource_descr (Hash) —

    contains the properties of the new resource

  • The (String) —

    type of the resource we want to create

  • oproperties (Hash) —

    is a hash with all the OProperty values of the new resource

  • Defines (Authorizer) —

    context for authorization decisions

Returns:

  • (OResource) —

    Returns the created resource



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# File 'lib/omf-sfa/am/am_scheduler.rb', line 30

def create_resource(resource_descr, type_to_create, oproperties, authorizer)
  debug "create_resource: resource_descr:'#{resource_descr}' type_to_create:'#{type_to_create}' oproperties:'#{oproperties}' authorizer:'#{authorizer.inspect}'"
  if type_to_create.eql?('node')
    desc = resource_descr.dup
    desc[:account] = ()

    type = type_to_create.camelize

    base_resource = eval("OMF::SFA::Resource::#{type}").first(desc)

    if base_resource.nil? || !base_resource.available
      raise UnknownResourceException.new "Resource '#{desc.inspect}' is not available or doesn't exist"
    end

    # create a clone
    vr = base_resource.clone

    vr. = authorizer.
    vr.provided_by = base_resource
    vr.save

    base_resource.provides << vr
    base_resource.save

    return vr
  elsif type_to_create.eql?('OLease')
    resource_descr[:resource_type] = type_to_create
    lease = OMF::SFA::Resource::OLease.create(resource_descr)
    lease.valid_from = oproperties[:valid_from]
    lease.valid_until = oproperties[:valid_until]
    #lease.status = :pending
    raise UnavailableResourceException.new "Cannot create '#{resource_descr.inspect}'" unless lease.save
    return lease
  else
    raise "Uknown type of resource '#{type_to_create}'. Expected one of 'Node' or 'OLease'"
  end
end

#get_nil_account ⇒ OAccount

It returns the default account, normally used for admin account.

Returns:

  • (OAccount) —

    returns the default account object



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# File 'lib/omf-sfa/am/am_scheduler.rb', line 135

def ()
    @nil_account
end

#lease_component(lease, component) ⇒ Boolean

Accept or reject the reservation of the component

Parameters:

  • lease (OLease) —

    contains the corresponding reservation window

  • component (OComponent) —

    is the resource we want to reserve

Returns:

  • (Boolean) —

    returns true or false depending on the outcome of the request



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# File 'lib/omf-sfa/am/am_scheduler.rb', line 107

def lease_component(lease, component)
  # TODO: Implement a basic FCFS for the competing leases of a component.
  # Basic Component provides itself(clones) so many times as the accepted leases on it.
  debug "lease_component: lease:'#{lease.name}' to component:'#{component.name}'"

  base = component.provided_by
  base.leases.each do |l|
    if (lease.valid_from >= l.valid_until || lease.valid_until <= l.valid_from)
      #all ok, do nothing
    elsif (lease.valid_from <= l.valid_from && lease.valid_until > l.valid_from)#overlapping time
      raise UnavailableResourceException.new "Cannot lease '#{component.name}', because it is unavailable for the requested time."
    elsif (lease.valid_from >= l.valid_from && lease.valid_from <= l.valid_until)#overlapping time
      raise UnavailableResourceException.new "Cannot lease '#{component.name}', because it is unavailable for the requested time."
    end
  end
  lease.status = "accepted"
  base.leases << lease
  base.save
  component.leases << lease
  component.save
  #@am_liaison.enable_lease(lease, component)
  return true
end

#release_resource(resource, authorizer) ⇒ Boolean

Releases/destroys the given resource

Parameters:

  • The (OResource) —

    actual resource we want to destroy

  • Defines (Authorizer) —

    context for authorization decisions

Returns:

  • (Boolean) —

    Returns true for success otherwise false



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# File 'lib/omf-sfa/am/am_scheduler.rb', line 74

def release_resource(resource, authorizer)
  debug "release_resource: resource-> '#{resource.to_json}'"
  unless resource.is_a? OMF::SFA::Resource::OResource
    raise "Expected OResource but got '#{resource.inspect}'"
  end

  base = resource.provided_by

  unless resource.leases.empty?
    base.leases.each do |l|
      if (l.id == resource.leases.first.id)
        time = Time.now
        if (l.valid_until <= time)
          l.status = "past"
        else
          l.status = "cancelled"
        end
      end
    end
    msg = resource.leases.first.component_leases.destroy!
    raise "Failed to destroy component_leases" unless msg
  end
  resource = resource.destroy!
  raise "Failed to destroy resource" unless resource
  resource
end