| /** |
| * 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.client.processor; |
| |
| import io.netty.buffer.ByteBuf; |
| import lombok.AllArgsConstructor; |
| import lombok.Getter; |
| import org.apache.pulsar.client.api.Schema; |
| import org.apache.pulsar.common.allocator.PulsarByteBufAllocator; |
| |
| /** |
| * A batch message whose format is customized. |
| * |
| * 1. First 2 bytes represent the number of messages. |
| * 2. Each message is a string, whose format is |
| * 1. First 2 bytes represent the length `N`. |
| * 2. Followed N bytes are the bytes of the string. |
| */ |
| public class CustomBatchFormat { |
| |
| public static final String KEY = "entry.format"; |
| public static final String VALUE = "custom"; |
| |
| @AllArgsConstructor |
| @Getter |
| public static class Metadata { |
| private final int numMessages; |
| } |
| |
| public static ByteBuf serialize(Iterable<String> strings) { |
| final ByteBuf buf = PulsarByteBufAllocator.DEFAULT.buffer(1024); |
| buf.writeShort(0); |
| short numMessages = 0; |
| for (String s : strings) { |
| writeString(buf, s); |
| numMessages++; |
| } |
| buf.setShort(0, numMessages); |
| return buf; |
| } |
| |
| private static void writeString(final ByteBuf buf, final String s) { |
| final byte[] bytes = Schema.STRING.encode(s); |
| buf.writeShort(bytes.length); |
| buf.writeBytes(bytes); |
| } |
| |
| public static Metadata readMetadata(final ByteBuf buf) { |
| return new Metadata(buf.readShort()); |
| } |
| |
| public static byte[] readMessage(final ByteBuf buf) { |
| final short length = buf.readShort(); |
| final byte[] bytes = new byte[length]; |
| buf.readBytes(bytes); |
| return bytes; |
| } |
| } |