1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
require_relative "streaming-pull-reader"
module ArrowFormat
class StreamingReader
include Enumerable
attr_reader :schema
def initialize(input)
@input = input
@schema = nil
end
def each
return to_enum(__method__) unless block_given?
reader = StreamingPullReader.new do |record_batch|
@schema ||= reader.schema
yield(record_batch)
end
buffer = "".b
loop do
next_size = reader.next_required_size
break if next_size.zero?
next_chunk = @input.read(next_size, buffer)
break if next_chunk.nil?
reader.consume(IO::Buffer.for(next_chunk))
end
end
end
end
|
