spark KVStoreSerializer 源码
spark KVStoreSerializer 代码
文件路径：/common/kvstore/src/main/java/org/apache/spark/util/kvstore/KVStoreSerializer.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.spark.util.kvstore;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.spark.annotation.Private;
/**
* Serializer used to translate between app-defined types and the disk-based stores.
*
* <p>
* The serializer is based on Jackson, so values are written as JSON. It also allows "naked strings"
* and integers to be written as values directly, which will be written as UTF-8 strings.
* </p>
*/
@Private
public class KVStoreSerializer {
/**
* Object mapper used to process app-specific types. If an application requires a specific
* configuration of the mapper, it can subclass this serializer and add custom configuration
* to this object.
*/
protected final ObjectMapper mapper;
public KVStoreSerializer() {
this.mapper = new ObjectMapper();
}
public final byte[] serialize(Object o) throws Exception {
if (o instanceof String) {
return ((String) o).getBytes(UTF_8);
} else {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
try (GZIPOutputStream out = new GZIPOutputStream(bytes)) {
mapper.writeValue(out, o);
}
return bytes.toByteArray();
}
}
@SuppressWarnings("unchecked")
public final <T> T deserialize(byte[] data, Class<T> klass) throws Exception {
if (klass.equals(String.class)) {
return (T) new String(data, UTF_8);
} else {
try (GZIPInputStream in = new GZIPInputStream(new ByteArrayInputStream(data))) {
return mapper.readValue(in, klass);
}
}
}
final byte[] serialize(long value) {
return String.valueOf(value).getBytes(UTF_8);
}
final long deserializeLong(byte[] data) {
return Long.parseLong(new String(data, UTF_8));
}
}
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