#330

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Build # #330

Build Type

Pull #187

github

Committed by

web-flow

Commit Message

Merge b3aa7e284 into 359e3da7b

Pull Request Pull Request #187: Update dependency org.mybatis:mybatis-parent to v37

Run Details

163 of 199 relevant lines covered (81.91%)

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81.48

/src/main/java/org/mybatis/caches/redis/KryoSerializer.java

/*
 *    Copyright 2015-2022 the original author or authors.
 *
 *    Licensed 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
 *
 *       https://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.mybatis.caches.redis;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * SerializeUtil with Kryo, which is faster and more space consuming.
 *
 * @author Lei Jiang(ladd.cn@gmail.com)
 */
public enum KryoSerializer implements Serializer {
  // Enum singleton, which is preferred approach since Java 1.5
  INSTANCE;

  /**
   * kryo is thread-unsafe, use ThreadLocal.
   */
  private ThreadLocal<Kryo> kryos = ThreadLocal.withInitial(() -> new Kryo());

  /**
   * Classes which can not resolved by default kryo serializer, which occurs very
   * rare(https://github.com/EsotericSoftware/kryo#using-standard-java-serialization) For these classes, we will use
   * fallbackSerializer(use JDKSerializer now) to resolve.
   */
  private Set<Class<?>> unnormalClassSet;

  /**
   * Hash codes of unnormal bytes which can not resolved by default kryo serializer, which will be resolved by
   * fallbackSerializer
   */
  private Set<Integer> unnormalBytesHashCodeSet;
  private Serializer fallbackSerializer;

  private KryoSerializer() {
    unnormalClassSet = ConcurrentHashMap.newKeySet();
    unnormalBytesHashCodeSet = ConcurrentHashMap.newKeySet();
    fallbackSerializer = JDKSerializer.INSTANCE;// use JDKSerializer as fallback
  }

  public byte[] serialize(Object object) {
    if (!unnormalClassSet.contains(object.getClass())) {
      /**
       * In the following cases: 1. This class occurs for the first time. 2. This class have occurred and can be
       * resolved by default kryo serializer
       */
      try {
        Output output = new Output(200, -1);
        kryos.get().writeClassAndObject(output, object);
        return output.toBytes();
      } catch (Exception e) {
        // For unnormal class occurred for the first time, exception will be thrown
        unnormalClassSet.add(object.getClass());
        return fallbackSerializer.serialize(object);// use fallback Serializer to resolve
      }
    } else {
      // For unnormal class
      return fallbackSerializer.serialize(object);
    }
  }

  public Object unserialize(byte[] bytes) {
    if (bytes == null) {
      return null;
    }
    int hashCode = Arrays.hashCode(bytes);
    if (!unnormalBytesHashCodeSet.contains(hashCode)) {
      /**
       * In the following cases: 1. This bytes occurs for the first time. 2. This bytes have occurred and can be
       * resolved by default kryo serializer
       */
      try {
        Input input = new Input();
        input.setBuffer(bytes);
        return kryos.get().readClassAndObject(input);
      } catch (Exception e) {
        // For unnormal bytes occurred for the first time, exception will be thrown
        unnormalBytesHashCodeSet.add(hashCode);
        return fallbackSerializer.unserialize(bytes);// use fallback Serializer to resolve
      }
    } else {
      // For unnormal bytes
      return fallbackSerializer.unserialize(bytes);
    }
  }

}

1	/*
2	* Copyright 2015-2022 the original author or authors.
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* https://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package org.mybatis.caches.redis;
17
18	import com.esotericsoftware.kryo.Kryo;
19	import com.esotericsoftware.kryo.io.Input;
20	import com.esotericsoftware.kryo.io.Output;
21
22	import java.util.Arrays;
23	import java.util.Set;
24	import java.util.concurrent.ConcurrentHashMap;
25
26	/**
27	* SerializeUtil with Kryo, which is faster and more space consuming.
28	*
29	* @author Lei Jiang(ladd.cn@gmail.com)
30	*/
31	public enum KryoSerializer implements Serializer {	1✔
32	// Enum singleton, which is preferred approach since Java 1.5
33	INSTANCE;	1✔
34
35	/**
36	* kryo is thread-unsafe, use ThreadLocal.
37	*/
38	private ThreadLocal<Kryo> kryos = ThreadLocal.withInitial(() -> new Kryo());	1✔
39
40	/**
41	* Classes which can not resolved by default kryo serializer, which occurs very
42	* rare(https://github.com/EsotericSoftware/kryo#using-standard-java-serialization) For these classes, we will use
43	* fallbackSerializer(use JDKSerializer now) to resolve.
44	*/
45	private Set<Class<?>> unnormalClassSet;
46
47	/**
48	* Hash codes of unnormal bytes which can not resolved by default kryo serializer, which will be resolved by
49	* fallbackSerializer
50	*/
51	private Set<Integer> unnormalBytesHashCodeSet;
52	private Serializer fallbackSerializer;
53
54	private KryoSerializer() {	1✔
55	unnormalClassSet = ConcurrentHashMap.newKeySet();	1✔
56	unnormalBytesHashCodeSet = ConcurrentHashMap.newKeySet();	1✔
57	fallbackSerializer = JDKSerializer.INSTANCE;// use JDKSerializer as fallback	1✔
58	}	1✔
59
60	public byte[] serialize(Object object) {
61	if (!unnormalClassSet.contains(object.getClass())) {	1✔
62	/**
63	* In the following cases: 1. This class occurs for the first time. 2. This class have occurred and can be
64	* resolved by default kryo serializer
65	*/
66	try {
67	Output output = new Output(200, -1);	1✔
68	kryos.get().writeClassAndObject(output, object);	1✔
69	return output.toBytes();	1✔
70	} catch (Exception e) {	×
71	// For unnormal class occurred for the first time, exception will be thrown
72	unnormalClassSet.add(object.getClass());	×
73	return fallbackSerializer.serialize(object);// use fallback Serializer to resolve	×
74	}
75	} else {
76	// For unnormal class
77	return fallbackSerializer.serialize(object);	×
78	}
79	}
80
81	public Object unserialize(byte[] bytes) {
82	if (bytes == null) {	1✔
83	return null;	1✔
84	}
85	int hashCode = Arrays.hashCode(bytes);	1✔
86	if (!unnormalBytesHashCodeSet.contains(hashCode)) {	1✔
87	/**
88	* In the following cases: 1. This bytes occurs for the first time. 2. This bytes have occurred and can be
89	* resolved by default kryo serializer
90	*/
91	try {
92	Input input = new Input();	1✔
93	input.setBuffer(bytes);	1✔
94	return kryos.get().readClassAndObject(input);	1✔
95	} catch (Exception e) {	1✔
96	// For unnormal bytes occurred for the first time, exception will be thrown
97	unnormalBytesHashCodeSet.add(hashCode);	1✔
98	return fallbackSerializer.unserialize(bytes);// use fallback Serializer to resolve	1✔
99	}
100	} else {
101	// For unnormal bytes
102	return fallbackSerializer.unserialize(bytes);	×
103	}
104	}
105
106	}

mybatis / redis-cache / #330

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