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All fibers
########################
# First example
def find_in_batches
index = 0
chunk_size = 2
while batch = query_batch(index, chunk_size)
return if batch.length == 0
yield batch
index += 1
end
end
def query_batch(index, chunk_size)
range_beginning = index * chunk_size
large_dataset[range_beginning...(range_beginning+2)]
end
def large_dataset
[
"Vhils",
"AKACORLEONE",
"Pixel Pancho",
"+-",
"Kruella D'Enfer",
"Tamara Alves",
"Add Fuel",
"MAR",
"Eime",
"Bordalo II",
"Felipe Pantone",
"Ernest Zacharevic",
"Wasted Rita",
"Sainer"
]
end
########################
# Second example
def process_batch(batch)
p batch
end
# this method runs in a background job
def complex_operation_in_background
find_in_batches do |batch|
# the complex operation on the given batch
process_batch(batch)
end
end
# Execution in the terminal
# >> complex_operation_in_background
# ["Vhils", "AKACORLEONE"]
# ["Pixel Pancho", "+-"]
# ["Kruella D'Enfer", "Tamara Alves"]
# ["Add Fuel", "MAR"]
# ["Eime", "Bordalo II"]
# ["Felipe Pantone", "Ernest Zacharevic"]
# ["Wasted Rita", "Sainer"]
########################
# Third example
def complex_operation_in_background_with_recursion(batch_index = 0)
chunk_size = 2
batch = query_batch(batch_index, chunk_size)
return if batch.length == 0
process_batch(batch)
complex_operation_in_background_with_recursion(batch_index + 1)
end
# Execution in the terminal
# >> complex_operation_in_background_with_recursion
# ["Vhils", "AKACORLEONE"]
# ["Pixel Pancho", "+-"]
# ["Kruella D'Enfer", "Tamara Alves"]
# ["Add Fuel", "MAR"]
# ["Eime", "Bordalo II"]
# ["Felipe Pantone", "Ernest Zacharevic"]
# ["Wasted Rita", "Sainer"]
########################
# Fourth example
require "fiber"
def find_in_batches_with_fiber
Fiber.new do
index = 0
chunk_size = 2
while batch = query_batch(index, chunk_size)
break if batch.length == 0
Fiber.yield batch
index += 1
end
end
end
def complex_operation_in_background_with_fibers(fiber = nil)
fiber ||= find_in_batches_with_fiber
if fiber.alive? && (batch = fiber.resume)
process_batch(batch)
complex_operation_in_background_with_fibers(fiber)
end
end
# Execution in the terminal
# >> complex_operation_in_background_with_fibers
# ["Vhils", "AKACORLEONE"]
# ["Pixel Pancho", "+-"]
# ["Kruella D'Enfer", "Tamara Alves"]
# ["Add Fuel", "MAR"]
# ["Eime", "Bordalo II"]
# ["Felipe Pantone", "Ernest Zacharevic"]
# ["Wasted Rita", "Sainer"]
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