kafka TimestampRandomPayloadGenerator 源码
kafka TimestampRandomPayloadGenerator 代码
文件路径:/trogdor/src/main/java/org/apache/kafka/trogdor/workload/TimestampRandomPayloadGenerator.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;
import java.nio.ByteOrder;
import java.util.Random;
import java.nio.ByteBuffer;
/**
* A PayloadGenerator which generates a timestamped uniform random payload.
*
* This generator generates pseudo-random payloads that can be reproduced from run to run.
* The guarantees are the same as those of java.util.Random.
*
* The timestamp used for this class is in milliseconds since epoch, encoded directly to the first several bytes of the
* payload.
*
* This should be used in conjunction with TimestampRecordProcessor in the Consumer to measure true end-to-end latency
* of a system.
*
* `size` - The size in bytes of each message.
* `seed` - Used to initialize Random() to remove some non-determinism.
*
* Here is an example spec:
*
* {
* "type": "timestampRandom",
* "size": 512
* }
*
* This will generate a 512-byte random message with the first several bytes encoded with the timestamp.
*/
public class TimestampRandomPayloadGenerator implements PayloadGenerator {
private final int size;
private final long seed;
private final byte[] randomBytes;
private final ByteBuffer buffer;
private final Random random = new Random();
@JsonCreator
public TimestampRandomPayloadGenerator(@JsonProperty("size") int size,
@JsonProperty("seed") long seed) {
this.size = size;
this.seed = seed;
if (size < Long.BYTES) {
throw new RuntimeException("The size of the payload must be greater than or equal to " + Long.BYTES + ".");
}
random.setSeed(seed);
this.randomBytes = new byte[size - Long.BYTES];
buffer = ByteBuffer.allocate(Long.BYTES);
buffer.order(ByteOrder.LITTLE_ENDIAN);
}
@JsonProperty
public int size() {
return size;
}
@JsonProperty
public long seed() {
return seed;
}
@Override
public synchronized byte[] generate(long position) {
// Generate out of order to prevent inclusion of random number generation in latency numbers.
byte[] result = new byte[size];
if (randomBytes.length > 0) {
random.setSeed(seed + position);
random.nextBytes(randomBytes);
System.arraycopy(randomBytes, 0, result, Long.BYTES, randomBytes.length);
}
// Do the timestamp generation as the very last task.
buffer.clear();
buffer.putLong(Time.SYSTEM.milliseconds());
buffer.rewind();
System.arraycopy(buffer.array(), 0, result, 0, Long.BYTES);
return result;
}
}
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