kafka UniformRandomPayloadGenerator 源码

kafka UniformRandomPayloadGenerator 代码

文件路径：/trogdor/src/main/java/org/apache/kafka/trogdor/workload/UniformRandomPayloadGenerator.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 java.util.Random;

/**
 * A PayloadGenerator which generates a 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.
 *
 * This payload generator also has the option to append padding bytes at the end of the payload.
 * The padding bytes are always the same, no matter what the position is.  This is useful when
 * simulating a partly-compressible stream of user data.
 */
public class UniformRandomPayloadGenerator implements PayloadGenerator {
    private final int size;
    private final long seed;
    private final int padding;
    private final Random random = new Random();
    private final byte[] padBytes;
    private final byte[] randomBytes;

    @JsonCreator
    public UniformRandomPayloadGenerator(@JsonProperty("size") int size,
                                         @JsonProperty("seed") long seed,
                                         @JsonProperty("padding") int padding) {
        this.size = size;
        this.seed = seed;
        this.padding = padding;
        if (padding < 0 || padding > size) {
            throw new RuntimeException("Invalid value " + padding + " for " +
                "padding: the number of padding bytes must not be smaller than " +
                "0 or greater than the total payload size.");
        }
        this.padBytes = new byte[padding];
        random.setSeed(seed);
        random.nextBytes(padBytes);
        this.randomBytes = new byte[size - padding];
    }

    @JsonProperty
    public int size() {
        return size;
    }

    @JsonProperty
    public long seed() {
        return seed;
    }

    @JsonProperty
    public int padding() {
        return padding;
    }

    @Override
    public synchronized byte[] generate(long position) {
        byte[] result = new byte[size];
        if (randomBytes.length > 0) {
            random.setSeed(seed + position);
            random.nextBytes(randomBytes);
            System.arraycopy(randomBytes, 0, result, 0, Math.min(randomBytes.length, result.length));
        }
        if (padBytes.length > 0) {
            System.arraycopy(padBytes, 0, result, randomBytes.length, result.length - randomBytes.length);
        }
        return result;
    }
}

相关信息

kafka 源码目录

相关文章

kafka ConfigurableProducerSpec 源码

kafka ConfigurableProducerWorker 源码

kafka ConnectionStressSpec 源码

kafka ConnectionStressWorker 源码

kafka ConstantFlushGenerator 源码

kafka ConstantPayloadGenerator 源码

kafka ConstantThroughputGenerator 源码

kafka ConsumeBenchSpec 源码

kafka ConsumeBenchWorker 源码

kafka ExternalCommandSpec 源码