Class: HBase::HTable

Inherits:
Object
  • Object
show all
Includes:
XmlDecoder
Defined in:
lib/mandy/ruby-hbase/hbase_table.rb

Constant Summary collapse

DEFAULT_GET_OPTIONS =

Standard CRUD ops

{:timestamp => nil, :columns => nil}

Instance Method Summary collapse

Methods included from XmlDecoder

#parse_row_result

Constructor Details

#initialize(table_uri) ⇒ HTable

Returns a new instance of HTable.



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 11

def initialize(table_uri)
  @table_uri = table_uri

  @uri = URI.parse(table_uri)
  
  @host, @table_name = @uri.host, @uri.path.split("/").last
end

Instance Method Details

#column_descriptors ⇒ Object 



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 31

def column_descriptors
  column_families = []
  
  # get the xml for the column descriptors
  response = Net::HTTP.get_response(@uri.host, "/api/#{@table_name}", @uri.port)
  body = response.body
  
  # parse the xml into a document
  doc = XML::Parser.string(body).parse
  
  doc.find("/table/columnfamilies/columnfamily").each do |node|
    colfam = {}
    colfam[:name] = node.find_first("name").content.strip.chop
    column_families << colfam
  end
  column_families
end

#delete(row, columns = nil, timestamp = nil) ⇒ Object 



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 110

def delete(row, columns = nil, timestamp = nil)
  Net::HTTP.start(@uri.host, @uri.port) do |session|
    columns_query = Array(columns).compact.map{ |name| "column=#{name}" }.join("&")
    
    response = session.delete("/api/#{@table_name}/row/#{row}?#{columns_query}")  
    case response.code.to_i
      when 202
        return true
      else
        unexpected_response(response)
    end

  end
end

#get(key, options = {}) ⇒ Object 



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 55

def get(key, options = {})
  opts = DEFAULT_GET_OPTIONS.merge(options)
  
  columns = Array(opts.delete(:columns)).compact
  timestamp = opts.delete(:timestamp)
  timestamp = (timestamp.to_f * 1000).to_i.to_s if timestamp
  
  Net::HTTP.start(@uri.host, @uri.port) do |session|
    columns_query = columns.map{ |name| "column=#{name}" }.join("&")

    ts_section = timestamp ? "/#{timestamp}" : ""

    query_string = "?" + columns_query
                  
    query = "/api/#{@table_name}/row/#{url_encode(key)}#{ts_section}#{query_string}"
    response = session.get(query, {"Accept" => "*/*"})

    case response.code.to_i
      when 200 #success!
        body = response.body
        parse_row_result(body).last
      when 204 #no data - probably an incorrect colname
        raise "Didn't get any data back - check your column names!"
      when 404
        raise RowNotFound, "Could not find row '#{key}'"
      else
        nil
    end
  end
end

#get_scanner(start_row, end_row, timestamp = nil, columns = nil) ⇒ Object

Scanning interface



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 128

def get_scanner(start_row, end_row, timestamp = nil, columns = nil)
  start_row_query = start_row ? "start_row=#{start_row}" : nil
  end_row_query = end_row ? "end_row=#{end_row}" : nil      
  timestamp_section = timestamp ? "/#{(timestamp.to_f * 1000).to_i}" : nil
  columns_section = columns ? columns.map{ |col| "column=#{col}" }.join("&") : nil

  query_string = [start_row_query, end_row_query, 
                  timestamp_section, columns_section].compact.join("&")

  path = ""

  # open the scanner
  Net::HTTP.start(@uri.host, @uri.port) do |session|
    response = session.post("/api/#{@table_name}/scanner?#{query_string}", 
      "", {"Accept" => "text/xml"}
    )
    
    case response.code.to_i
      when 201
        # redirect - grab the path and send
        Scanner.new(self, "http://#{@uri.host}:#{@uri.port}" + response["Location"])
      else
        unexpected_response(response)
    end
  end      
end

#name ⇒ Object 



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 19

def name
  @table_name
end

#put(key, keys_and_values, timestamp = nil) ⇒ Object 



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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 86

def put(key, keys_and_values, timestamp = nil)
  Net::HTTP.start(@uri.host, @uri.port) do |session|
    xml = "<columns>"
    
    ts_section = timestamp ? "/#{(timestamp.to_f * 1000).to_i}" : ""
    
    keys_and_values.each do |name, value|
      xml << "<column><name>#{name}</name><value>#{[value.to_s].pack("m")}</value></column>"          
    end
    
    xml << "</columns>"
    
    query = "/api/#{@table_name}/row/#{url_encode(key)}#{ts_section}"
    response = session.post(query, xml, {"Content-type" => "text/xml"})
    
    case response.code.to_i
      when 200
        true
      else
        unexpected_response(response)
    end
  end
end

#start_keys ⇒ Object

Meta-type requests

Raises:

  • (NotImplementedError) 


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# File 'lib/mandy/ruby-hbase/hbase_table.rb', line 26

def start_keys
  raise NotImplementedError
end