Class: Orchestrator::Status

Inherits:
Object
  • Object
show all
Defined in:
lib/orchestrator/status.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(thread) ⇒ Status

Returns a new instance of Status.



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# File 'lib/orchestrator/status.rb', line 34

def initialize(thread)
    @thread = thread
    @controller = ::Orchestrator::Control.instance

    @find_subscription = method(:find_subscription)

    # {:mod_id => {status => Subscriptions}}
    @subscriptions = {}
    # {:system_id => Subscriptions}
    @systems = {}
end

Instance Attribute Details

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/orchestrator/status.rb', line 47

def thread
  @thread
end

Instance Method Details

#exec_unsubscribe(sub) ⇒ Object

NOTE

Only to be called from subscription thread



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# File 'lib/orchestrator/status.rb', line 177

def exec_unsubscribe(sub)
    # Update the system lookup if a system was specified
    if sub.sys_id
        subscriptions = @systems[sub.sys_id]
        if subscriptions
            subscriptions.delete(sub)

            if subscriptions.empty?
                @systems.delete(sub.sys_id)
            end
        end
    end

    # Update the module lookup
    statuses = @subscriptions[sub.mod_id]
    if statuses
        subscriptions = statuses[sub.status]
        if subscriptions
            subscriptions.delete(sub)

            if subscriptions.empty?
                statuses.delete(sub.status)

                if statuses.empty?
                    @subscriptions.delete(sub.mod_id)
                end
            end
        end
    end
end

#move(mod_id, to_thread) ⇒ Object

Used to maintain subscriptions where module is moved to another thread or even another server.



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# File 'lib/orchestrator/status.rb', line 102

def move(mod_id, to_thread)
    return if to_thread == self

    @thread.schedule do
        subs = @subscriptions.delete(mod_id)
        if subs
            # Remove the system references
            subs.each do |sub|
                @systems[sub.sys_id].delete(sub) if sub.sys_id
            end

            # Transfer the subscriptions
            to_thread.transfer(mod_id, subs)
        end
    end
end

#reloaded_system(sys_id, sys) ⇒ Object

The System class contacts each of the threads to let them know of an update



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# File 'lib/orchestrator/status.rb', line 133

def reloaded_system(sys_id, sys)
    subscriptions = @systems[sys_id]
    if subscriptions
        subscriptions.each do |sub|
            old_id = sub.mod_id

            # re-index the subscription
            mod = sys.get(sub.mod_name, sub.index - 1)
            sub.mod_id = mod ? mod.settings.id.to_sym : nil

            # Check for changes (order, removal, replacement)
            if old_id != sub.mod_id
                @subscriptions[old_id][sub.status].delete(sub)

                # Update to the new module
                if sub.mod_id
                    @subscriptions[sub.mod_id] ||= {}
                    @subscriptions[sub.mod_id][sub.status] ||= Set.new
                    @subscriptions[sub.mod_id][sub.status].add(sub)

                    # Check for existing status to send to subscriber
                    value = mod.status[sub.status]
                    sub.notify(value) unless value.nil?
                end

                # Transfer the subscription if on a different thread
                if mod.thread != @thread
                    move(sub.mod_id.to_sym, mod.thread)
                end

                # Perform any required cleanup
                if @subscriptions[old_id][sub.status].empty?
                    @subscriptions[old_id].delete(sub.status)
                    if @subscriptions[old_id].empty?
                        @subscriptions.delete(old_id)
                    end
                end
            end
        end
    end
end

#subscribe(opt) ⇒ Object

Subscribes to updates from a system module Modules do not have to exist and updates will be triggered as soon as they are



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# File 'lib/orchestrator/status.rb', line 52

def subscribe(opt)     # sys_name, mod_name, index, status, callback, on_thread
    if opt[:sys_name] && !opt[:sys_id]
        @thread.work(proc {
            id = ::Orchestrator::ControlSystem.bucket.get("sysname-#{sys_name}")
            opt[:sys_id] = id

            # Grabbing system here as thread-safe and has the potential to block
            ::Orchestrator::System.get(id)
        }).then(proc { |sys|
            mod = sys.get(opt[:mod_name], opt[:index] - 1)
            if mod
                opt[:mod_id] = mod.settings.id.to_sym
                opt[:mod] = mod
            end

            do_subscribe(opt)
        })
    else
        do_subscribe(opt)
    end
end

#transfer(mod_id, subs) ⇒ Object 



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# File 'lib/orchestrator/status.rb', line 119

def transfer(mod_id, subs)
    @thread.schedule do
        @subscriptions[mod_id] = subs

        subs.each do |sub|
            if sub.sys_id
                @systems[sub.sys_id] ||= Set.new
                @systems[sub.sys_id] << sub
            end
        end
    end
end

#unsubscribe(sub) ⇒ Object

Removes subscription callback from the lookup



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# File 'lib/orchestrator/status.rb', line 75

def unsubscribe(sub)
    if sub.is_a? ::Libuv::Q::Promise 
        sub.then @find_subscription
    else
        find_subscription(sub)
    end
end

#update(mod_id, status, value) ⇒ Object

Triggers an update to be sent to listening callbacks



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# File 'lib/orchestrator/status.rb', line 84

def update(mod_id, status, value)
    mod = @subscriptions[mod_id]
    if mod
        subscribed = mod[status]
        if subscribed
            subscribed.each do |subscription|
                begin
                    subscription.notify(value)
                rescue => e
                    @controller.log_unhandled_exception(e)
                end
            end
        end
    end
end