Fix: erroneous iadd operator for Stats.IO

[deliverable/lttng-analyses.git] / lttnganalyses / core / stats.py

# The MIT License (MIT)
#
# Copyright (C) 2015 - Antoine Busque <abusque@efficios.com>
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from collections import namedtuple


PrioEvent = namedtuple('PrioEvent', ['timestamp', 'prio'])


class Stats():
    def reset(self):
        raise NotImplementedError()


class Process(Stats):
    def __init__(self, pid, tid, comm):
        self.pid = pid
        self.tid = tid
        self.comm = comm
        self.prio_list = []

    @classmethod
    def new_from_process(cls, proc):
        return cls(proc.pid, proc.tid, proc.comm)

    def update_prio(self, timestamp, prio):
        self.prio_list.append(PrioEvent(timestamp, prio))

    def reset(self):
        if self.prio_list:
            # Keep the last prio as the first for the next period
            self.prio_list = self.prio_list[-1:]


class IO(Stats):
    def __init__(self):
        # Number of bytes read or written
        self.read = 0
        self.write = 0

    def reset(self):
        self.read = 0
        self.write = 0

    def __iadd__(self, other):
        self.read += other.read
        self.write += other.write
        return self