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# Copyright 2021 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from collections import deque
from . import base
class SequenceProc(base.TestProc):
"""Processor ensuring heavy tests are sent sequentially into the execution
pipeline.
The class keeps track of the number of tests in the pipeline marked heavy
and permits only a configurable amount. An excess amount is queued and sent
as soon as other heavy tests return.
"""
def __init__(self, max_heavy):
"""Initialize the processor.
Args:
max_heavy: The maximum number of heavy tests that will be sent further
down the pipeline simultaneously.
"""
super(SequenceProc, self).__init__()
assert max_heavy > 0
self.max_heavy = max_heavy
self.n_heavy = 0
self.buffer = deque()
def next_test(self, test):
if test.is_heavy:
if self.n_heavy < self.max_heavy:
# Enough space to send more heavy tests. Check if the test is not
# filtered otherwise.
used = self._send_test(test)
if used:
self.n_heavy += 1
return used
else:
# Too many tests in the pipeline. Buffer the test and indicate that
# this test didn't end up in the execution queue (i.e. test loader
# will try to send more tests).
self.buffer.append(test)
return False
else:
return self._send_test(test)
def result_for(self, test, result):
if test.is_heavy:
# A heavy test finished computing. Try to send one from the buffer.
self.n_heavy -= 1
while self.buffer:
next_test = self.buffer.popleft()
if self._send_test(next_test):
self.n_heavy += 1
break
self._send_result(test, result)
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