Class: Knj::Threadhandler

Inherits:
Object show all
Defined in:
lib/knj/threadhandler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Threadhandler

Returns a new instance of Threadhandler.



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# File 'lib/knj/threadhandler.rb', line 4

def initialize(args = {})
  require "#{$knjpath}errors"
  
  @args = args
  @objects = []
  @args[:timeout] = 5 if !@args[:timeout]
  @args[:max] = 50 if !@args[:max]
  @inactive_blocks = []
  @activate_blocks = []
  @mutex = Mutex.new
  
  @thread_timeout = Thread.new do
    begin
      loop do
        sleep @args[:timeout]
        break if !@mutex
        check_inactive
      end
    rescue => e
      STDOUT.print Knj::Errors.error_str(e)
    end
  end
end

Instance Attribute Details

#activate_blocks ⇒ Object (readonly)

Returns the value of attribute activate_blocks.



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# File 'lib/knj/threadhandler.rb', line 2

def activate_blocks
  @activate_blocks
end

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/knj/threadhandler.rb', line 2

def args
  @args
end

#inactive_blocks ⇒ Object (readonly)

Returns the value of attribute inactive_blocks.



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# File 'lib/knj/threadhandler.rb', line 2

def inactive_blocks
  @inactive_blocks
end

#mutex ⇒ Object (readonly)

Returns the value of attribute mutex.



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# File 'lib/knj/threadhandler.rb', line 2

def mutex
  @mutex
end

#objects ⇒ Object (readonly)

Returns the value of attribute objects.



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# File 'lib/knj/threadhandler.rb', line 2

def objects
  @objects
end

Instance Method Details

#check_inactive ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 65

def check_inactive
  raise "Destroyed Knj::Threadhandler." if !@mutex
  @mutex.synchronize do
    cur_time = Time.now.to_i - @args[:timeout]
    @objects.each do |data|
      if data[:free] and !data[:inactive] and data[:free] < cur_time
        @inactive_blocks.each do |block|
          data[:inactive] = true
          block.call(:obj => data[:object])
        end
      end
    end
  end
end

#destroy ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 43

def destroy
  return false if !@mutex
  
  @thread_timeout.kill if @thread_timeout and @thread_timeout.alive?
  @thread_timeout = nil
  
  @mutex.synchronize do
    @objects.each do |data|
      @inactive_blocks.each do |block|
        data[:inactive] = true
        block.call(:obj => data[:object])
      end
    end
  end
  
  @args = nil
  @objects = nil
  @inactive_blocks = nil
  @activate_blocks = nil
  @mutex = nil
end

#free(obj) ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 133

def free(obj)
  @mutex.synchronize do
    return false if !@mutex or !@objects #something is trying to free and object, but the handler is destroyed. Dont crash but return false.
    
    freedata = false
    @objects.each do |data|
      if data[:object] == obj
        freedata = data
        break
      end
    end
    
    raise "Could not find that object in list." if !freedata
    STDOUT.print "Freed one.\n" if @args[:debug]
    freedata[:free] = Time.now.to_i
  end
end

#get_and_lock ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 80

def get_and_lock
  raise "Destroyed Knj::Threadhandler." if !@mutex
  newobj = nil
  sleep_do = false
  
  begin
    @mutex.synchronize do
      retdata = false
      @objects.each do |data|
        if data[:free]
          retdata = data
          break
        end
      end
      
      if retdata
        #Test if object is still free - if not, try again - knj.
        return get_and_lock if !retdata[:free]
        retdata[:free] = false
        
        if retdata[:inactive]
          @activate_blocks.each do |block|
            block.call(:obj => retdata[:object])
          end
          
          retdata.delete(:inactive)
        end
        
        return retdata[:object]
      end
      
      if @objects.length >= @args[:max]
        #The maximum amount of objects has already been spawned... Sleep 0.1 sec and try to lock an object again...
        raise Knj::Errors::Retry
      else
        #No free objects, but we can spawn a new one and use that...
        newobj = @spawn_new_block.call
        @objects << {
          :free => false,
          :object => newobj
        }
        STDOUT.print "Spawned db and locked new.\n" if @args[:debug]
      end
    end
    
    return newobj
  rescue Knj::Errors::Retry
    STDOUT.print "All objects was taken - sleeping 0.1 sec and tries again.\n" #if @args[:debug]
    sleep 0.1
    retry
  end
end

#on_activate(&block) ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 38

def on_activate(&block)
  raise "Destroyed Knj::Threadhandler." if !@mutex
  @activate_blocks << block
end

#on_inactive(&block) ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 33

def on_inactive(&block)
  raise "Destroyed Knj::Threadhandler." if !@mutex
  @inactive_blocks << block
end

#on_spawn_new(&block) ⇒ Object 



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# File 'lib/knj/threadhandler.rb', line 28

def on_spawn_new(&block)
  raise "Destroyed Knj::Threadhandler." if !@mutex
  @spawn_new_block = block
end

#use ⇒ Object

Executes the given block with an element and then frees it.



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# File 'lib/knj/threadhandler.rb', line 152

def use
  raise "No block was given." if !block_given?
  
  obj = self.get_and_lock
  
  begin
    yield(obj)
  ensure
    self.free(obj)
  end
end