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Add "warmup with rate limiting" implementation for traffic shaping (a…
…libaba#220) - Add a new kind of control behavior `warm up + rate limiter`, behaving as both warm up and pace control
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85 changes: 85 additions & 0 deletions
85
...ava/com/alibaba/csp/sentinel/slots/block/flow/controller/WarmUpRateLimiterController.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /* | ||
| * Copyright 1999-2018 Alibaba Group Holding Ltd. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
| package com.alibaba.csp.sentinel.slots.block.flow.controller; | ||
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| import java.util.concurrent.atomic.AtomicLong; | ||
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| import com.alibaba.csp.sentinel.node.Node; | ||
| import com.alibaba.csp.sentinel.util.TimeUtil; | ||
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| /** | ||
| * @author jialiang.linjl | ||
| */ | ||
| public class WarmUpRateLimiterController extends WarmUpController { | ||
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| final int timeOutInMs; | ||
| final AtomicLong latestPassedTime = new AtomicLong(-1); | ||
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| /** | ||
| * @param count | ||
| * @param warmUpPeriodSec | ||
| */ | ||
| public WarmUpRateLimiterController(double count, int warmUpPeriodSec, int timeOutMs, int coldFactor) { | ||
| super(count, warmUpPeriodSec, coldFactor); | ||
| this.timeOutInMs = timeOutMs; | ||
| } | ||
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| @Override | ||
| public boolean canPass(Node node, int acquireCount) { | ||
| long previousQps = node.previousPassQps(); | ||
| syncToken(previousQps); | ||
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| long currentTime = TimeUtil.currentTimeMillis(); | ||
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| long restToken = storedTokens.get(); | ||
| long costTime = 0; | ||
| long expectedTime = 0; | ||
| if (restToken >= warningToken) { | ||
| long aboveToken = restToken - warningToken; | ||
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| // current interval = restToken*slope+1/count | ||
| double warmingQps = Math.nextUp(1.0 / (aboveToken * slope + 1.0 / count)); | ||
| costTime = Math.round(1.0 * (acquireCount) / warmingQps * 1000); | ||
| } else { | ||
| costTime = Math.round(1.0 * (acquireCount) / count * 1000); | ||
| } | ||
| expectedTime = costTime + latestPassedTime.get(); | ||
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| if (expectedTime <= currentTime) { | ||
| latestPassedTime.set(currentTime); | ||
| return true; | ||
| } else { | ||
| long waitTime = costTime + latestPassedTime.get() - currentTime; | ||
| if (waitTime >= timeOutInMs) { | ||
| return false; | ||
| } else { | ||
| long oldTime = latestPassedTime.addAndGet(costTime); | ||
| try { | ||
| waitTime = oldTime - TimeUtil.currentTimeMillis(); | ||
| if (waitTime >= timeOutInMs) { | ||
| latestPassedTime.addAndGet(-costTime); | ||
| return false; | ||
| } | ||
| Thread.sleep(waitTime); | ||
| return true; | ||
| } catch (InterruptedException e) { | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
| } | ||
|
|
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49 changes: 49 additions & 0 deletions
49
.../test/java/com/alibaba/csp/sentinel/slots/block/flow/WarmUpRateLimiterControllerTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package com.alibaba.csp.sentinel.slots.block.flow; | ||
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| import com.alibaba.csp.sentinel.node.Node; | ||
| import com.alibaba.csp.sentinel.node.StatisticNode; | ||
| import com.alibaba.csp.sentinel.slots.block.flow.controller.WarmUpRateLimiterController; | ||
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| import org.junit.Test; | ||
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| import static org.junit.Assert.assertFalse; | ||
| import static org.junit.Assert.assertTrue; | ||
| import static org.mockito.Mockito.mock; | ||
| import static org.mockito.Mockito.when; | ||
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| /** | ||
| * @author CarpenterLee | ||
| */ | ||
| public class WarmUpRateLimiterControllerTest { | ||
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| @Test | ||
| public void testPace() throws InterruptedException { | ||
| WarmUpRateLimiterController controller = new WarmUpRateLimiterController(10, 10, 1000, 3); | ||
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| Node node = mock(Node.class); | ||
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| when(node.passQps()).thenReturn(100L); | ||
| when(node.previousPassQps()).thenReturn(100L); | ||
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| assertTrue(controller.canPass(node, 1)); | ||
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| long start = System.currentTimeMillis(); | ||
| assertTrue(controller.canPass(node, 1)); | ||
| long cost = System.currentTimeMillis() - start; | ||
| assertTrue(cost >= 100 && cost <= 110); | ||
| } | ||
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| @Test | ||
| public void testPaceCanNotPass() throws InterruptedException { | ||
| WarmUpRateLimiterController controller = new WarmUpRateLimiterController(10, 10, 10, 3); | ||
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| Node node = mock(Node.class); | ||
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| when(node.passQps()).thenReturn(100L); | ||
| when(node.previousPassQps()).thenReturn(100L); | ||
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| assertTrue(controller.canPass(node, 1)); | ||
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| assertFalse(controller.canPass(node, 1)); | ||
| } | ||
| } |
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