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105
pinot-common/src/main/java/org/apache/pinot/common/utils/MapUtils.java
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| @@ -0,0 +1,105 @@ | ||
| /** | ||
| * 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.pinot.common.utils; | ||
|
|
||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.google.common.base.Preconditions; | ||
| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
| import java.util.Map; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| import static java.nio.charset.StandardCharsets.UTF_8; | ||
|
|
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|
|
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| public class MapUtils { | ||
|
|
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| private static final Logger LOGGER = LoggerFactory.getLogger(MapUtils.class); | ||
|
|
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| private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); | ||
|
|
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| private MapUtils() { | ||
| } | ||
|
|
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| public static byte[] serializeMap(Map<String, Object> map) | ||
| throws JsonProcessingException { | ||
| int size = map.size(); | ||
|
|
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| // Directly return the size (0) for empty map | ||
| if (size == 0) { | ||
| return new byte[Integer.BYTES]; | ||
| } | ||
|
|
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| // Besides the value bytes, we store: size, length for each key, length for each value | ||
| long bufferSize = (1 + 2 * (long) size) * Integer.BYTES; | ||
| byte[][] keyBytesArray = new byte[size][]; | ||
| byte[][] valueBytesArray = new byte[size][]; | ||
|
|
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| int index = 0; | ||
| for (Map.Entry<String, Object> entry : map.entrySet()) { | ||
| byte[] keyBytes = entry.getKey().getBytes(UTF_8); | ||
| bufferSize += keyBytes.length; | ||
| keyBytesArray[index] = keyBytes; | ||
| byte[] valueBytes = OBJECT_MAPPER.writeValueAsBytes(entry.getValue()); | ||
| bufferSize += valueBytes.length; | ||
| valueBytesArray[index++] = valueBytes; | ||
| } | ||
| Preconditions.checkState(bufferSize <= Integer.MAX_VALUE, "Buffer size exceeds 2GB"); | ||
| byte[] bytes = new byte[(int) bufferSize]; | ||
| ByteBuffer byteBuffer = ByteBuffer.wrap(bytes); | ||
| byteBuffer.putInt(size); | ||
| for (int i = 0; i < index; i++) { | ||
| byte[] keyBytes = keyBytesArray[i]; | ||
| byteBuffer.putInt(keyBytes.length); | ||
| byteBuffer.put(keyBytes); | ||
| byte[] valueBytes = valueBytesArray[i]; | ||
| byteBuffer.putInt(valueBytes.length); | ||
| byteBuffer.put(valueBytes); | ||
| } | ||
| return bytes; | ||
| } | ||
|
|
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| public static Map<String, Object> deserializeMap(ByteBuffer byteBuffer) { | ||
| int size = byteBuffer.getInt(); | ||
| if (size == 0) { | ||
| return Map.of(); | ||
| } | ||
|
|
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| Map<String, Object> map = new java.util.HashMap<>(size); | ||
| for (int i = 0; i < size; i++) { | ||
| int keyLength = byteBuffer.getInt(); | ||
| byte[] keyBytes = new byte[keyLength]; | ||
| byteBuffer.get(keyBytes); | ||
| String key = new String(keyBytes, UTF_8); | ||
| int valueLength = byteBuffer.getInt(); | ||
| byte[] valueBytes = new byte[valueLength]; | ||
| byteBuffer.get(valueBytes); | ||
| Object value = null; | ||
| try { | ||
| value = OBJECT_MAPPER.readValue(valueBytes, Object.class); | ||
| } catch (IOException e) { | ||
| LOGGER.error("Caught exception while deserializing value for key: {}", key, e); | ||
| } | ||
| map.put(key, value); | ||
| } | ||
| return map; | ||
| } | ||
| } |
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