129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#include "lib/utility/utility.h"
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#include "lib/ob_define.h"
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#include "lib/utility/ob_print_utils.h"
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#include "lib/oblog/ob_log_module.h"
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#include "lib/metrics/ob_ema_v2.h"
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#include <gtest/gtest.h>
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#include <cmath>
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using namespace oceanbase::common;
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bool eq(double a, double b)
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{
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return std::abs(a-b) < OB_DOUBLE_EPSINON;
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}
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TEST(ObEMA, equal_test)
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{
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ObEMA acc(0.8);
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ASSERT_TRUE(eq(0, acc.get_value()));
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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}
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TEST(ObEMA, serial_1_test)
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{
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double alpha = 0.8;
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double expect = 0;
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int64_t val = 0;
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ObEMA acc(alpha);
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ASSERT_TRUE(eq(0, acc.get_value()));
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expect = 1;
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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val = 2;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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val = 0;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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COMMON_LOG(INFO, "acc value", "val", acc.get_value());
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}
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// serial: 1,2,3, alpha = 0.8, so the latest value has a big impact
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TEST(ObEMA, serial_recent_first_test)
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{
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double alpha = 0.8;
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double expect = 0;
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int64_t val = 0;
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ObEMA acc(alpha);
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ASSERT_TRUE(eq(0, acc.get_value()));
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// serial: 1,2,1
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expect = 1;
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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val = 2;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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val = 3;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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COMMON_LOG(INFO, "acc value", "val", acc.get_value());
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}
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// serial: 1,2,3, alpha = 0.1, so the historical value has a big impact
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TEST(ObEMA, serial_old_first_test)
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{
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double alpha = 0.1;
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double expect = 0;
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int64_t val = 0;
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ObEMA acc(alpha);
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ASSERT_TRUE(eq(0, acc.get_value()));
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expect = 1;
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acc.update(1);
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ASSERT_TRUE(eq(1, acc.get_value()));
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val = 2;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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val = 3;
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acc.update(val);
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expect = alpha * (double)val + (1 - alpha) * expect;
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ASSERT_TRUE(eq(expect, acc.get_value()));
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COMMON_LOG(INFO, "acc value", "val", acc.get_value());
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}
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int main(int argc, char **argv)
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{
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OB_LOGGER.set_log_level("INFO");
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::testing::InitGoogleTest(&argc,argv);
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return RUN_ALL_TESTS();
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}
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