Class: Async::Container::Generic

Inherits:
Object
  • Object
show all
Defined in:
lib/async/container/generic.rb

Overview

A base class for implementing containers.

Direct Known Subclasses

Forked, Threaded

Constant Summary collapse

UNNAMED = 
"Unnamed"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**options) ⇒ Generic

Returns a new instance of Generic.



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# File 'lib/async/container/generic.rb', line 42

def initialize(**options)
	@group = Group.new
	@running = true
	
	@state = {}
	
	@statistics = Statistics.new
	@keyed = {}
end

Instance Attribute Details

#group ⇒ Object (readonly)

Returns the value of attribute group.



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# File 'lib/async/container/generic.rb', line 52

def group
  @group
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/async/container/generic.rb', line 54

def state
  @state
end

#statistics ⇒ Object

Statistics relating to the behavior of children instances.



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# File 'lib/async/container/generic.rb', line 70

def statistics
  @statistics
end

Class Method Details

.run(*arguments, **options, &block) ⇒ Object 



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# File 'lib/async/container/generic.rb', line 36

def self.run(*arguments, **options, &block)
	self.new.run(*arguments, **options, &block)
end

Instance Method Details

#[](key) ⇒ Object

Look up a child process by key. A key could be a symbol, a file path, or something else which the child instance represents.



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# File 'lib/async/container/generic.rb', line 64

def [] key
	@keyed[key]&.value
end

#async(**options, &block) ⇒ Object

Deprecated.

Please use #spawn or run instead.



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# File 'lib/async/container/generic.rb', line 194

def async(**options, &block)
	spawn(**options) do |instance|
		Async::Reactor.run(instance, &block)
	end
end

#failed? ⇒ Boolean

Whether any failures have occurred within the container.

Returns:

  • (Boolean) 


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# File 'lib/async/container/generic.rb', line 74

def failed?
	@statistics.failed?
end

#key?(key) ⇒ Boolean

Whether a child instance exists for the given key.

Returns:

  • (Boolean) 


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# File 'lib/async/container/generic.rb', line 229

def key?(key)
	if key
		@keyed.key?(key)
	end
end

#mark?(key) ⇒ Boolean

Mark the container’s keyed instance which ensures that it won’t be discarded.

Returns:

  • (Boolean) 


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# File 'lib/async/container/generic.rb', line 216

def mark?(key)
	if key
		if value = @keyed[key]
			value.mark!
			
			return true
		end
	end
	
	return false
end

#reload ⇒ Object

Reload the container’s keyed instances.



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# File 'lib/async/container/generic.rb', line 201

def reload
	@keyed.each_value(&:clear!)
	
	yield
	
	dirty = false
	
	@keyed.delete_if do |key, value|
		value.stop? && (dirty = true)
	end
	
	return dirty
end

#run(count: Container.processor_count, **options, &block) ⇒ Object

Run multiple instances of the same block in the container.



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# File 'lib/async/container/generic.rb', line 185

def run(count: Container.processor_count, **options, &block)
	count.times do
		spawn(**options, &block)
	end
	
	return self
end

#running? ⇒ Boolean

Whether the container has running children instances.

Returns:

  • (Boolean) 


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# File 'lib/async/container/generic.rb', line 79

def running?
	@group.running?
end

#sleep(duration = nil) ⇒ Object

Sleep until some state change occurs.



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# File 'lib/async/container/generic.rb', line 85

def sleep(duration = nil)
	@group.sleep(duration)
end

#spawn(name: nil, restart: false, key: nil, &block) ⇒ Object

Spawn a child instance into the container.



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# File 'lib/async/container/generic.rb', line 139

def spawn(name: nil, restart: false, key: nil, &block)
	name ||= UNNAMED
	
	if mark?(key)
		Console.logger.debug(self) {"Reusing existing child for #{key}: #{name}"}
		return false
	end
	
	@statistics.spawn!
	
	fiber do
		while @running
			child = self.start(name, &block)
			
			state = insert(key, child)
			
			begin
				status = @group.wait_for(child) do |message|
					state.update(message)
				end
			ensure
				delete(key, child)
			end
			
			if status.success?
				Console.logger.debug(self) {"#{child} exited with #{status}"}
			else
				@statistics.failure!
				Console.logger.error(self) {status}
			end
			
			if restart
				@statistics.restart!
			else
				break
			end
		end
	# ensure
	# 	Console.logger.error(self) {$!} if $!
	end.resume
	
	return true
end

#status?(flag) ⇒ Boolean

Returns true if all children instances have the specified status flag set. e.g. ‘:ready`. This state is updated by the process readiness protocol mechanism. See Notify::Client for more details.

Returns:

  • (Boolean) 


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# File 'lib/async/container/generic.rb', line 98

def status?(flag)
	# This also returns true if all processes have exited/failed:
	@state.all?{|_, state| state[flag]}
end

#stop(timeout = true) ⇒ Object

Stop the children instances.



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# File 'lib/async/container/generic.rb', line 124

def stop(timeout = true)
	@running = false
	@group.stop(timeout)
	
	if @group.running?
		Console.logger.warn(self) {"Group is still running after stopping it!"}
	end
ensure
	@running = true
end

#to_s ⇒ Object

A human readable representation of the container.



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# File 'lib/async/container/generic.rb', line 58

def to_s
	"#{self.class} with #{@statistics.spawns} spawns and #{@statistics.failures} failures."
end

#wait ⇒ Object

Wait until all spawned tasks are completed.



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# File 'lib/async/container/generic.rb', line 90

def wait
	@group.wait
end

#wait_until_ready ⇒ Object

Wait until all the children instances have indicated that they are ready.



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# File 'lib/async/container/generic.rb', line 105

def wait_until_ready
	while true
		Console.logger.debug(self) do |buffer|
			buffer.puts "Waiting for ready:"
			@state.each do |child, state|
				buffer.puts "\t#{child.class}: #{state.inspect}"
			end
		end
		
		self.sleep
		
		if self.status?(:ready)
			return true
		end
	end
end