Class: Kafka::Protocol::Encoder
- Inherits:
-
Object
- Object
- Kafka::Protocol::Encoder
- Defined in:
- lib/kafka/protocol/encoder.rb
Overview
An encoder wraps an IO object, making it easy to write specific data types to it.
Class Method Summary collapse
-
.encode_with(object) ⇒ String
Encodes an object into a new buffer.
Instance Method Summary collapse
-
#initialize(io) ⇒ Encoder
constructor
Initializes a new encoder.
-
#write(bytes) ⇒ nil
Writes bytes directly to the IO object.
-
#write_array(array, &block) ⇒ nil
Writes an array to the IO object.
-
#write_bytes(bytes) ⇒ nil
Writes a byte string to the IO object.
-
#write_int16(int) ⇒ nil
Writes a 16-bit integer to the IO object.
-
#write_int32(int) ⇒ nil
Writes a 32-bit integer to the IO object.
-
#write_int64(int) ⇒ nil
Writes a 64-bit integer to the IO object.
-
#write_int8(int) ⇒ nil
Writes an 8-bit integer to the IO object.
-
#write_string(string) ⇒ nil
Writes a string to the IO object.
Constructor Details
#initialize(io) ⇒ Encoder
Initializes a new encoder.
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# File 'lib/kafka/protocol/encoder.rb', line 13 def initialize(io) @io = io @io.set_encoding(Encoding::BINARY) end |
Class Method Details
.encode_with(object) ⇒ String
Encodes an object into a new buffer.
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# File 'lib/kafka/protocol/encoder.rb', line 103 def self.encode_with(object) buffer = StringIO.new encoder = new(buffer) object.encode(encoder) buffer.string end |
Instance Method Details
#write(bytes) ⇒ nil
Writes bytes directly to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 22 def write(bytes) @io.write(bytes) nil end |
#write_array(array, &block) ⇒ nil
Writes an array to the IO object.
Each item in the specified array will be yielded to the provided block; it's the responsibility of the block to write those items using the encoder.
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# File 'lib/kafka/protocol/encoder.rb', line 68 def write_array(array, &block) write_int32(array.size) array.each(&block) end |
#write_bytes(bytes) ⇒ nil
Writes a byte string to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 90 def write_bytes(bytes) if bytes.nil? write_int32(-1) else write_int32(bytes.bytesize) write(bytes) end end |
#write_int16(int) ⇒ nil
Writes a 16-bit integer to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 40 def write_int16(int) write([int].pack("s>")) end |
#write_int32(int) ⇒ nil
Writes a 32-bit integer to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 48 def write_int32(int) write([int].pack("l>")) end |
#write_int64(int) ⇒ nil
Writes a 64-bit integer to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 56 def write_int64(int) write([int].pack("q>")) end |
#write_int8(int) ⇒ nil
Writes an 8-bit integer to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 32 def write_int8(int) write([int].pack("C")) end |
#write_string(string) ⇒ nil
Writes a string to the IO object.
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# File 'lib/kafka/protocol/encoder.rb', line 77 def write_string(string) if string.nil? write_int16(-1) else write_int16(string.bytesize) write(string) end end |