Class: MassiveRecord::Wrapper::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/massive_record/wrapper/connection.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Connection

Returns a new instance of Connection.



7
8
9
10
11
 
# File 'lib/massive_record/wrapper/connection.rb', line 7

def initialize(opts = {})
  @timeout = 4000
  @host    = opts[:host]
  @port    = opts[:port] || 9090
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

Wrapp HBase API to be able to catch errors and try reconnect



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
 
# File 'lib/massive_record/wrapper/connection.rb', line 53

def method_missing(method, *args)
  begin
    open if not @client
    client.send(method, *args) if @client
  rescue IOError
    @client = nil
    open
    client.send(method, *args) if @client
  rescue Thrift::TransportException
    @transport = nil
    @client = nil
    open
    client.send(method, *args) if @client
  end
end

Instance Attribute Details

#host ⇒ Object

Returns the value of attribute host.



5
6
7
 
# File 'lib/massive_record/wrapper/connection.rb', line 5

def host
  @host
end

#port ⇒ Object

Returns the value of attribute port.



5
6
7
 
# File 'lib/massive_record/wrapper/connection.rb', line 5

def port
  @port
end

#timeout ⇒ Object

Returns the value of attribute timeout.



5
6
7
 
# File 'lib/massive_record/wrapper/connection.rb', line 5

def timeout
  @timeout
end

Instance Method Details

#active? ⇒ Boolean

Returns:

  • (Boolean) 


37
38
39
 
# File 'lib/massive_record/wrapper/connection.rb', line 37

def active?
  @transport.open?
end

#client ⇒ Object 



33
34
35
 
# File 'lib/massive_record/wrapper/connection.rb', line 33

def client
  @client
end

#close ⇒ Object 



29
30
31
 
# File 'lib/massive_record/wrapper/connection.rb', line 29

def close
  @transport.close.nil?
end

#load_table(table_name) ⇒ Object 



48
49
50
 
# File 'lib/massive_record/wrapper/connection.rb', line 48

def load_table(table_name)
  MassiveRecord::Wrapper::Table.new(self, table_name)
end

#open ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/massive_record/wrapper/connection.rb', line 17

def open
  protocol = Thrift::BinaryProtocol.new(transport)
  @client = Apache::Hadoop::Hbase::Thrift::Hbase::Client.new(protocol)
  
  begin
    transport.open()
    true
  rescue
    raise MassiveRecord::ConnectionException.new, "Unable to connect to HBase on #{@host}, port #{@port}"
  end
end

#tables ⇒ Object 



41
42
43
44
45
46
 
# File 'lib/massive_record/wrapper/connection.rb', line 41

def tables
  collection = TablesCollection.new
  collection.connection = self
  getTableNames().each{|table_name| collection.push(table_name)}
  collection
end

#transport ⇒ Object 



13
14
15
 
# File 'lib/massive_record/wrapper/connection.rb', line 13

def transport
  @transport ||= Thrift::BufferedTransport.new(Thrift::Socket.new(@host, @port, @timeout))
end