Class: Aerospike::ReadCommand
- Inherits:
-
SingleCommand
- Object
- Command
- SingleCommand
- Aerospike::ReadCommand
- Defined in:
- lib/aerospike/command/read_command.rb
Overview
:nodoc:
Direct Known Subclasses
Constant Summary collapse
- BIN_NAME_ENCODING =
'utf-8'
Instance Attribute Summary collapse
-
#policy ⇒ Object
readonly
Returns the value of attribute policy.
-
#record ⇒ Object
readonly
Returns the value of attribute record.
Instance Method Summary collapse
- #get_node ⇒ Object
- #handle_udf_error(result_code) ⇒ Object
-
#initialize(cluster, policy, key, bin_names) ⇒ ReadCommand
constructor
A new instance of ReadCommand.
- #parse_record(op_count, field_count, generation, expiration) ⇒ Object
- #parse_result ⇒ Object
- #write_buffer ⇒ Object
Methods inherited from Command
#execute, #set_delete, #set_exists, #set_operate, #set_query, #set_read, #set_read_for_key_only, #set_read_header, #set_scan, #set_touch, #set_udf, #set_write, #write_bins
Constructor Details
#initialize(cluster, policy, key, bin_names) ⇒ ReadCommand
Returns a new instance of ReadCommand.
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# File 'lib/aerospike/command/read_command.rb', line 35 def initialize(cluster, policy, key, bin_names) super(cluster, key) @bin_names = bin_names @policy = policy self end |
Instance Attribute Details
#policy ⇒ Object (readonly)
Returns the value of attribute policy.
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# File 'lib/aerospike/command/read_command.rb', line 33 def policy @policy end |
#record ⇒ Object (readonly)
Returns the value of attribute record.
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# File 'lib/aerospike/command/read_command.rb', line 33 def record @record end |
Instance Method Details
#get_node ⇒ Object
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# File 'lib/aerospike/command/read_command.rb', line 44 def get_node @cluster.read_node(@partition, @policy.replica, @sequence) end |
#handle_udf_error(result_code) ⇒ Object
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# File 'lib/aerospike/command/read_command.rb', line 147 def handle_udf_error(result_code) ret = @record.bins['FAILURE'] raise Aerospike::Exceptions::Aerospike.new(result_code, ret, [@node]) if ret raise Aerospike::Exceptions::Aerospike.new(result_code, nil, [@node]) end |
#parse_record(op_count, field_count, generation, expiration) ⇒ Object
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# File 'lib/aerospike/command/read_command.rb', line 153 def parse_record(op_count, field_count, generation, expiration) bins = op_count > 0 ? {} : nil receive_offset = 0 single_bin_value = !policy.is_a?(OperatePolicy) || policy.record_bin_multiplicity == RecordBinMultiplicity::SINGLE # There can be fields in the response (setname etc). # But for now, ignore them. Expose them to the API if needed in the future. if field_count > 0 # Just skip over all the fields i = 0 while i < field_count field_size = @data_buffer.read_int32(receive_offset) receive_offset += (4 + field_size) i = i.succ end end i = 0 while i < op_count op_size = @data_buffer.read_int32(receive_offset) particle_type = @data_buffer.read(receive_offset+5).ord name_size = @data_buffer.read(receive_offset+7).ord name = @data_buffer.read(receive_offset+8, name_size).force_encoding(BIN_NAME_ENCODING) receive_offset += 4 + 4 + name_size particle_bytes_size = op_size - (4 + name_size) value = Aerospike.bytes_to_particle(particle_type, @data_buffer, receive_offset, particle_bytes_size) receive_offset += particle_bytes_size if single_bin_value || !bins.has_key?(name) bins[name] = value elsif (prev = bins[name]).is_a?(OpResults) prev << value else bins[name] = OpResults.new << prev << value end i = i.succ end Record.new(@node, @key, bins, generation, expiration) end |
#parse_result ⇒ Object
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# File 'lib/aerospike/command/read_command.rb', line 52 def parse_result # Read header. begin @conn.read(@data_buffer, 8) rescue => e Aerospike.logger.error("parse result error: #{e}") raise e end # inflate if compressed compressed_sz = compressed_size if compressed_sz begin # waste 8 size bytes @conn.read(@data_buffer, 8) # read compressed message @conn.read(@data_buffer, compressed_sz - 8) # inflate the results # TODO: reuse the current buffer uncompressed = Zlib.inflate(@data_buffer.buf) @data_buffer = Buffer.new(-1, uncompressed) rescue => e Aerospike.logger.error("parse result error: #{e}") raise e end else begin bytes_read = @conn.read(@data_buffer, MSG_TOTAL_HEADER_SIZE - 8, 8) rescue => e Aerospike.logger.error("parse result error: #{e}") raise e end end # A number of these are commented out because we just don't care enough to read # that section of the header. If we do care, uncomment and check! sz = @data_buffer.read_int64(0) header_length = @data_buffer.read(8).ord result_code = @data_buffer.read(13).ord & 0xFF generation = @data_buffer.read_int32(14) expiration = @data_buffer.read_int32(18) field_count = @data_buffer.read_int16(26) # almost certainly 0 op_count = @data_buffer.read_int16(28) receive_size = (sz & 0xFFFFFFFFFFFF) - header_length # Read remaining message bytes. if compressed_sz @data_buffer.eat!(MSG_TOTAL_HEADER_SIZE) elsif receive_size > 0 size_buffer_sz(receive_size) begin @conn.read(@data_buffer, receive_size) rescue => e Aerospike.logger.error("parse result error: #{e}") raise e end end if result_code == 0 if op_count == 0 @record = Record.new(@node, @key, nil, generation, expiration) return end @record = parse_record(op_count, field_count, generation, expiration) return end return nil if result_code == Aerospike::ResultCode::KEY_NOT_FOUND_ERROR if result_code == Aerospike::ResultCode::FILTERED_OUT if @policy.fail_on_filtered_out raise Aerospike::Exceptions::Aerospike.new(result_code, nil, [@node]) end return end if result_code == Aerospike::ResultCode::UDF_BAD_RESPONSE begin @record = parse_record(op_count, field_count, generation, expiration) handle_udf_error(result_code) rescue => e Aerospike.logger.error("UDF execution error: #{e}") raise e end end raise Aerospike::Exceptions::Aerospike.new(result_code, nil, [@node]) end |
#write_buffer ⇒ Object
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# File 'lib/aerospike/command/read_command.rb', line 48 def write_buffer set_read(@policy, @key, @bin_names) end |