kafka ConstantThroughputGenerator 源码
kafka ConstantThroughputGenerator 代码
文件路径:/trogdor/src/main/java/org/apache/kafka/trogdor/workload/ConstantThroughputGenerator.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.kafka.trogdor.workload;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.kafka.common.utils.Time;
/**
* This throughput generator configures constant throughput.
*
* The lower the window size, the smoother the traffic will be. Using a 100ms window offers no noticeable spikes in
* traffic while still being long enough to avoid too much overhead.
*
* Here is an example spec:
*
* {
* "type": "constant",
* "messagesPerWindow": 50,
* "windowSizeMs": 100
* }
*
* This will produce a workload that runs 500 messages per second, with a maximum resolution of 50 messages per 100
* millisecond.
*
* If `messagesPerWindow` is less than or equal to 0, `throttle` will not throttle at all and will return immediately.
*/
public class ConstantThroughputGenerator implements ThroughputGenerator {
private final int messagesPerWindow;
private final long windowSizeMs;
private long nextWindowStarts = 0;
private int messageTracker = 0;
@JsonCreator
public ConstantThroughputGenerator(@JsonProperty("messagesPerWindow") int messagesPerWindow,
@JsonProperty("windowSizeMs") long windowSizeMs) {
// Calculate the default values.
if (windowSizeMs <= 0) {
windowSizeMs = 100;
}
this.windowSizeMs = windowSizeMs;
this.messagesPerWindow = messagesPerWindow;
calculateNextWindow();
}
@JsonProperty
public long windowSizeMs() {
return windowSizeMs;
}
@JsonProperty
public int messagesPerWindow() {
return messagesPerWindow;
}
private void calculateNextWindow() {
// Reset the message count.
messageTracker = 0;
// Calculate the next window start time.
long now = Time.SYSTEM.milliseconds();
if (nextWindowStarts > 0) {
while (nextWindowStarts <= now) {
nextWindowStarts += windowSizeMs;
}
} else {
nextWindowStarts = now + windowSizeMs;
}
}
@Override
public synchronized void throttle() throws InterruptedException {
// Run unthrottled if messagesPerWindow is not positive.
if (messagesPerWindow <= 0) {
return;
}
// Calculate the next window if we've moved beyond the current one.
if (Time.SYSTEM.milliseconds() >= nextWindowStarts) {
calculateNextWindow();
}
// Increment the message tracker.
messageTracker += 1;
// Compare the tracked message count with the throttle limits.
if (messageTracker >= messagesPerWindow) {
// Wait the difference in time between now and when the next window starts.
while (nextWindowStarts > Time.SYSTEM.milliseconds()) {
wait(nextWindowStarts - Time.SYSTEM.milliseconds());
}
}
}
}
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