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Pulsar Test Client
There is a newer version: 3.3.1
/*
 * 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.pulsar.testclient;

import java.nio.charset.StandardCharsets;
import java.util.Random;
import org.apache.commons.lang3.RandomStringUtils;

public class DefaultMessageFormatter implements IMessageFormatter {
    private final Random r  = new Random();


    @Override
    public byte[] formatMessage(String producerName, long msgId, byte[] message) {
        String sMessage = new String(message, StandardCharsets.UTF_8);
        if (producerName != null && !producerName.isEmpty()) {
            sMessage = sMessage.replaceAll("%p", producerName);
        }
        sMessage = sMessage.replaceAll("%i", String.valueOf(msgId));
        sMessage = sMessage.replaceAll("%t", String.valueOf(System.nanoTime()));

        int idx = sMessage.indexOf("%");
        while (idx > 0) {

            float size = 0;
            int i = 1;
            for (; idx + i < sMessage.length(); i++) {
                char c = sMessage.charAt(idx + i);
                if (Character.isDigit(c) && c != '.') {
                    continue;
                }
                if (c == '.' || c == '-') {
                    continue;
                }
                break;
            }
            if (i != 1) {
                size = Float.parseFloat(sMessage.substring(idx + 1, idx + i));
            }

            String sub = sMessage.substring(idx, idx + i + 1);

            if (sMessage.charAt(idx + i) == 'f') {
                sMessage = sMessage.replaceFirst(sub, getFloatValue(size));
            } else if (sMessage.charAt(idx + i) == 'l') {
                sMessage = sMessage.replaceFirst(sub, getLongValue(size));
            } else if (sMessage.charAt(idx + i) == 'd') {
                sMessage = sMessage.replaceFirst(sub, getIntValue(size));
            } else if (sMessage.charAt(idx + i) == 's') {
                sMessage = sMessage.replaceFirst(sub, getStringValue(size));
            }
            idx = sMessage.indexOf("%", idx);
        }
        return sMessage.getBytes(StandardCharsets.UTF_8);
    }

    private float get_FloatValue(float size) {
        float f = r.nextFloat();
        int mag = (int) Math.abs(size);
        f = f * (float) Math.pow(10, mag);
        if (size < 0 && ((int) f) % 2 == 1) {
            return f * -1;
        }
        return f;
    }

    private String getStringValue(float size) {
        return RandomStringUtils.randomAlphabetic((int) size);
    }

    private String getFloatValue(float size) {
        if (size == 0) {
            return String.valueOf(r.nextFloat());
        }
        String format = "%" + size + "f";

        return String.format(format, get_FloatValue(size));
    }

    private String getIntValue(float size) {
        if (size == 0) {
            return String.valueOf(r.nextInt());
        }

        return String.valueOf((int) get_FloatValue(size));
    }
    private String getLongValue(float size) {
        if (size == 0) {
            return String.valueOf(r.nextLong());
        }
        return String.valueOf((long) get_FloatValue(size));
    }
}