Class: Dolphin::DataStore::Cassandra

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/dolphin/data_stores/cassandra.rb

Defined Under Namespace

Classes: UnAvailableNodeException

Constant Summary collapse

PATH_SEPARATOR = 
':'.freeze

Instance Method Summary collapse

Methods included from Util

#logger

Constructor Details

#initialize(config) ⇒ Cassandra

Returns a new instance of Cassandra.



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# File 'lib/dolphin/data_stores/cassandra.rb', line 27

def initialize(config)
  @keyspace = config[:keyspace]
  raise "database hosts is blank" if config[:hosts].blank?
  @hosts = config[:hosts].split(',')
  @port = config[:port]
  @max_retry_count = config[:max_retry_count] || 3
  @retry_interval = config[:retry_interval] || 3
  @retry_count = 0
end

Instance Method Details

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dolphin/data_stores/cassandra.rb', line 63

def closed?
  @connection.nil?
end

#connect ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 37

def connect
  begin
    if @connection.nil?
      @connection = ::Cassandra.new(@keyspace, seeds)

      # test connecting..
      @connection.ring
      return @connection
    end
  rescue ThriftClient::NoServersAvailable => e
    logger :error, e
    @connection = nil
    if @retry_count < @max_retry_count
      @retry_count += 1
      logger :error, "retry connection..#{@retry_count}"
      sleep @retry_interval
      retry
    end
  rescue UnAvailableNodeException => e
    logger :error, e
  rescue CassandraThrift::InvalidRequestException => e
    logger :error, e
  end
  @connection
end

#delete_notification(notification) ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 87

def delete_notification(notification)
  n = Dolphin::Models::Cassandra::Notification.new(@connection)
  n.delete(notification)
end

#get_event(params) ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 77

def get_event(params)
  e = Dolphin::Models::Cassandra::Event.new(@connection)
  e.get(params)
end

#get_notification(id) ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 67

def get_notification(id)
  n = Dolphin::Models::Cassandra::Notification.new(@connection)
  n.get(id)
end

#put_event(event) ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 72

def put_event(event)
  e = Dolphin::Models::Cassandra::Event.new(@connection)
  e.put(event)
end

#put_notification(id, methods) ⇒ Object 



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# File 'lib/dolphin/data_stores/cassandra.rb', line 82

def put_notification(id, methods)
  n = Dolphin::Models::Cassandra::Notification.new(@connection)
  n.put(id, methods)
end