kafka SequentialPayloadGenerator 源码
kafka SequentialPayloadGenerator 代码
文件路径：/trogdor/src/main/java/org/apache/kafka/trogdor/workload/SequentialPayloadGenerator.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.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* A PayloadGenerator which generates a sequentially increasing payload.
*
* The generated number will wrap around to 0 after the maximum value is reached.
* Payloads bigger than 8 bytes will always just be padded with zeros after byte 8.
*/
public class SequentialPayloadGenerator implements PayloadGenerator {
private final int size;
private final long startOffset;
private final ByteBuffer buf;
@JsonCreator
public SequentialPayloadGenerator(@JsonProperty("size") int size,
@JsonProperty("offset") long startOffset) {
this.size = size;
this.startOffset = startOffset;
this.buf = ByteBuffer.allocate(8);
// Little-endian byte order allows us to support arbitrary lengths more easily,
// since the first byte is always the lowest-order byte.
this.buf.order(ByteOrder.LITTLE_ENDIAN);
}
@JsonProperty
public int size() {
return size;
}
@JsonProperty
public long startOffset() {
return startOffset;
}
@Override
public synchronized byte[] generate(long position) {
buf.clear();
buf.putLong(position + startOffset);
byte[] result = new byte[size];
System.arraycopy(buf.array(), 0, result, 0, Math.min(buf.array().length, result.length));
return result;
}
}
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