Class: Metriks::Reporter::Cassandra

Inherits:
Object
  • Object
show all
Defined in:
lib/metriks/reporter/cassandra.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host, options = {}) ⇒ Cassandra

Returns a new instance of Cassandra.



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# File 'lib/metriks/reporter/cassandra.rb', line 10

def initialize(host, options = {})
  @host = host
  @port = options[:port] || "9042"
  @prefix = options[:prefix]
  @source = options[:source]
  @database = options[:database]
  @table = options[:table]
  @interval = options[:interval] || 60
  @registry  = options[:registry] || Metriks::Registry.default
  @on_error  = options[:on_error] || proc { |ex| }

end

Instance Attribute Details

#prefix ⇒ Object

Returns the value of attribute prefix.



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# File 'lib/metriks/reporter/cassandra.rb', line 8

def prefix
  @prefix
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/metriks/reporter/cassandra.rb', line 8

def source
  @source
end

Instance Method Details

#close_connection ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 106

def close_connection
  connection.close
end

#connection ⇒ Object

two weeks



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# File 'lib/metriks/reporter/cassandra.rb', line 29

def connection
  @connection
end

#execute_prepared_statement(array) ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 114

def execute_prepared_statement array
  future = write_statement.async.execute(*array)
  future.on_failure do |error|
    raise error
  end
end

#open_connection ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 22

def open_connection
  @connection = Cql::Client.connect(host: @host)
  @connection.use(@database)

  @write_statement = @connection.prepare("INSERT INTO #{@table}(server,metric, time, v) VALUES
      (?, ?, ?, ?) USING TTL 1209600") # two weeks
end

#restart ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 52

def restart
  stop
  start
end

#send_metric(compound_name, metric, keys, snapshot_keys = []) ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 109

def send_metric(compound_name, metric, keys, snapshot_keys = [])
  keys.each do |key|
    execute_prepared_statement [@source,"#{compound_name}.#{key}","#{Time.now.to_i}",metric.send(key)]
  end
end

#start ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 32

def start
  @thread ||= Thread.new do
    loop do
      sleep @interval
      Thread.new do
        begin
          write
        rescue Exception => ex
          @on_error[ex] rescue nil
        end
      end
    end
  end
end

#stop ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 47

def stop
  @thread.kill if @thread
  @thread = nil
end

#write ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 57

def write
  open_connection
  @registry.each do |name, metric|
    case metric
    when Metriks::Meter
      send_metric name, metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate
      ]
    when Metriks::Counter
      send_metric name, metric, [
        :count
      ]
      metric.clear if metric.reset_on_submit
    when Metriks::Gauge
      send_metric name, metric, [
        :value
      ]
    when Metriks::UtilizationTimer
      send_metric name, metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate,
        :min, :max, :mean, :stddev,
        :one_minute_utilization, :five_minute_utilization,
        :fifteen_minute_utilization, :mean_utilization,
      ], [
        :median, :get_95th_percentile
      ]
    when Metriks::Timer
      send_metric name, metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate,
        :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
      metric.clear if metric.reset_on_submit
    when Metriks::Histogram
      send_metric name, metric, [
        :count, :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    end
  end
  sleep 2
  close_connection

end

#write_statement ⇒ Object 



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# File 'lib/metriks/reporter/cassandra.rb', line 120

def write_statement
  @write_statement
end