Class: Aerospike::QueryCommand

Inherits:
StreamCommand show all
Defined in:
lib/aerospike/query/query_command.rb

Overview

:nodoc:

Instance Method Summary collapse

Methods inherited from StreamCommand

#parse_group

Methods inherited from MultiCommand

#compressed?, #get_node, #parse_group, #parse_key, #parse_record, #parse_result, #read_bytes, #stop, #valid?

Methods inherited from Command

#execute, #set_delete, #set_exists, #set_operate, #set_read, #set_read_for_key_only, #set_read_header, #set_scan, #set_touch, #set_udf, #set_write, #write_bins

Constructor Details

#initialize(node, policy, statement, recordset) ⇒ QueryCommand

Returns a new instance of QueryCommand.



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# File 'lib/aerospike/query/query_command.rb', line 26

def initialize(node, policy, statement, recordset)
  super(node)

  @policy = policy
  @statement = statement
  @recordset = recordset
end

Instance Method Details

#is_scan? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aerospike/query/query_command.rb', line 231

def is_scan?
  @statement.filters.nil? || @statement.filters.empty?
end

#write_buffer ⇒ Object 



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# File 'lib/aerospike/query/query_command.rb', line 34

def write_buffer
  fieldCount = 0
  filterSize = 0
  binNameSize = 0
  predSize = 0

  begin_cmd

  if @statement.namespace
    @data_offset += @statement.namespace.bytesize + FIELD_HEADER_SIZE
    fieldCount+=1
  end

  if @statement.index_name
    @data_offset += @statement.index_name.bytesize + FIELD_HEADER_SIZE
    fieldCount+=1
  end

  if @statement.set_name
    @data_offset += @statement.set_name.bytesize + FIELD_HEADER_SIZE
    fieldCount+=1
  end

  if !is_scan?
    col_type = @statement.filters[0].collection_type
    if col_type > 0
      @data_offset += FIELD_HEADER_SIZE + 1
      fieldCount += 1
    end

    @data_offset += FIELD_HEADER_SIZE
    filterSize+=1 # num filters

    @statement.filters.each do |filter|
      sz = filter.estimate_size
      filterSize += sz
    end
    @data_offset += filterSize
    fieldCount+=1

    if @statement.bin_names && @statement.bin_names.length > 0
      @data_offset += FIELD_HEADER_SIZE
      binNameSize+=1 # num bin names

      @statement.bin_names.each do |bin_name|
        binNameSize += bin_name.bytesize + 1
      end
      @data_offset += binNameSize
      fieldCount+=1
    end
  else
    if @policy.records_per_second > 0
      @data_offset += 4 + FIELD_HEADER_SIZE
      fieldCount += 1
    end

    # Calling query with no filters is more efficiently handled by a primary index scan.
    # Estimate scan options size.
    @data_offset += (2 + FIELD_HEADER_SIZE)
    fieldCount+=1
  end

  @statement.set_task_id

  @data_offset += 8 + FIELD_HEADER_SIZE
  fieldCount+=1

  predexp = @policy.predexp || @statement.predexp

  if predexp
    @data_offset += FIELD_HEADER_SIZE
    predSize = Aerospike::PredExp.estimate_size(predexp)
    @data_offset += predSize
    fieldCount += 1
  end

  if @statement.function_name
    @data_offset += FIELD_HEADER_SIZE + 1 # udf type
    @data_offset += @statement.package_name.bytesize + FIELD_HEADER_SIZE
    @data_offset += @statement.function_name.bytesize + FIELD_HEADER_SIZE

    if @statement.function_args && @statement.function_args.length > 0
      functionArgBuffer = Value.of(@statement.function_args).to_bytes
    else
      functionArgBuffer = ''
    end
    @data_offset += FIELD_HEADER_SIZE + functionArgBuffer.bytesize
    fieldCount += 4
  end

  if @statement.filters.nil? || @statement.filters.empty?
    if @statement.bin_names && @statement.bin_names.length > 0
      @statement.bin_names.each do |bin_name|
        estimate_operation_size_for_bin_name(bin_name)
      end
    end
  end

  size_buffer

  readAttr = @policy.include_bin_data ? INFO1_READ : INFO1_READ | INFO1_NOBINDATA
  operation_count = (is_scan? && !@statement.bin_names.nil?) ? @statement.bin_names.length : 0

  write_header(@policy, readAttr, 0, fieldCount, operation_count)

  if @statement.namespace
    write_field_string(@statement.namespace, Aerospike::FieldType::NAMESPACE)
  end

  unless @statement.index_name.nil?
    write_field_string(@statement.index_name, Aerospike::FieldType::INDEX_NAME)
  end

  if @statement.set_name
    write_field_string(@statement.set_name, Aerospike::FieldType::TABLE)
  end

  if !is_scan?
    col_type = @statement.filters[0].collection_type
    if col_type > 0
      write_field_header(1, Aerospike::FieldType::INDEX_TYPE)
      @data_buffer.write_byte(col_type, @data_offset)
      @data_offset+=1
    end

    write_field_header(filterSize, Aerospike::FieldType::INDEX_RANGE)
    @data_buffer.write_byte(@statement.filters.length, @data_offset)
    @data_offset+=1

    @statement.filters.each do |filter|
      @data_offset = filter.write(@data_buffer, @data_offset)
    end

    # Query bin names are specified as a field (Scan bin names are specified later as operations)
    if @statement.bin_names && @statement.bin_names.length > 0
      write_field_header(binNameSize, Aerospike::FieldType::QUERY_BINLIST)
      @data_buffer.write_byte(@statement.bin_names.length, @data_offset)
      @data_offset += 1

      @statement.bin_names.each do |bin_name|
        len = @data_buffer.write_binary(bin_name, @data_offset + 1)
        @data_buffer.write_byte(len, @data_offset)
        @data_offset += len + 1;
      end
    end
  else
    if @policy.records_per_second > 0
      write_field_int(@policy.records_per_second, Aerospike::FieldType::RECORDS_PER_SECOND)
    end

    # Calling query with no filters is more efficiently handled by a primary index scan.
    write_field_header(2, Aerospike::FieldType::SCAN_OPTIONS)
    priority = @policy.priority.ord
    priority = priority << 4
    @data_buffer.write_byte(priority, @data_offset)
    @data_offset+=1
    @data_buffer.write_byte(100.ord, @data_offset)
    @data_offset+=1
  end

  write_field_header(8, Aerospike::FieldType::TRAN_ID)
  @data_buffer.write_int64(@statement.task_id, @data_offset)
  @data_offset += 8

  if predexp
    write_field_header(predSize, Aerospike::FieldType::PREDEXP)
    @data_offset = Aerospike::PredExp.write(
      predexp, @data_buffer, @data_offset
    )
  end

  if @statement.function_name
    write_field_header(1, Aerospike::FieldType::UDF_OP)
    if @statement.return_data
      @data_buffer.write_byte(1, @data_offset)
      @data_offset+=1
    else
      @data_buffer.write_byte(2, @data_offset)
      @data_offset+=1
    end

    write_field_string(@statement.package_name, Aerospike::FieldType::UDF_PACKAGE_NAME)
    write_field_string(@statement.function_name, Aerospike::FieldType::UDF_FUNCTION)
    write_field_bytes(functionArgBuffer, Aerospike::FieldType::UDF_ARGLIST)
  end

  if is_scan? && !@statement.bin_names.nil?
    @statement.bin_names.each do |bin_name|
      write_operation_for_bin_name(bin_name, Aerospike::Operation::READ)
    end
  end

  end_cmd

  return nil
end