Introduce serializeToByteArray/deserializeFromByteArray on (De)Serializer

Closes gh-25117

spring-context/src/main/java/org/springframework/cache/concurrent/ConcurrentMapCache.java

@@ -16,9 +16,6 @@
 
 package org.springframework.cache.concurrent;
 
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -45,6 +42,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.1
+ * @see ConcurrentMapCacheManager
  */
 public class ConcurrentMapCache extends AbstractValueAdaptingCache {
 
@@ -190,7 +188,7 @@ public class ConcurrentMapCache extends AbstractValueAdaptingCache {
 		Object storeValue = super.toStoreValue(userValue);
 		if (this.serialization != null) {
 			try {
-				return serializeValue(this.serialization, storeValue);
+				return this.serialization.serializeToByteArray(storeValue);
 			}
 			catch (Throwable ex) {
 				throw new IllegalArgumentException("Failed to serialize cache value '" + userValue +
@@ -202,17 +200,11 @@ public class ConcurrentMapCache extends AbstractValueAdaptingCache {
 		}
 	}
 
-	private static Object serializeValue(SerializationDelegate serialization, Object storeValue) throws IOException {
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		serialization.serialize(storeValue, out);
-		return out.toByteArray();
-	}
-
 	@Override
 	protected Object fromStoreValue(@Nullable Object storeValue) {
 		if (storeValue != null && this.serialization != null) {
 			try {
-				return super.fromStoreValue(deserializeValue(this.serialization, storeValue));
+				return super.fromStoreValue(this.serialization.deserializeFromByteArray((byte[]) storeValue));
 			}
 			catch (Throwable ex) {
 				throw new IllegalArgumentException("Failed to deserialize cache value '" + storeValue + "'", ex);
@@ -221,12 +213,6 @@ public class ConcurrentMapCache extends AbstractValueAdaptingCache {
 		else {
 			return super.fromStoreValue(storeValue);
 		}
-
-	}
-
-	private static Object deserializeValue(SerializationDelegate serialization, Object storeValue) throws IOException {
-		ByteArrayInputStream in = new ByteArrayInputStream((byte[]) storeValue);
-		return serialization.deserialize(in);
 	}
 
 }

spring-core/src/main/java/org/springframework/core/serializer/Deserializer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.core.serializer;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
@@ -24,8 +25,10 @@ import java.io.InputStream;
  *
  * @author Gary Russell
  * @author Mark Fisher
+ * @author Juergen Hoeller
  * @since 3.0.5
  * @param <T> the object type
+ * @see Serializer
  */
 @FunctionalInterface
 public interface Deserializer<T> {
@@ -41,4 +44,15 @@ public interface Deserializer<T> {
 	 */
 	T deserialize(InputStream inputStream) throws IOException;
 
+	/**
+	 * Read (assemble) an object of type T from the given byte array.
+	 * @param serialized the byte array
+	 * @return the deserialized object
+	 * @throws IOException in case of deserialization failure
+	 * @since 5.2.7
+	 */
+	default T deserializeFromByteArray(byte[] serialized) throws IOException {
+		return deserialize(new ByteArrayInputStream(serialized));
+	}
+
 }

spring-core/src/main/java/org/springframework/core/serializer/Serializer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.core.serializer;
 
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 
@@ -24,8 +25,10 @@ import java.io.OutputStream;
  *
  * @author Gary Russell
  * @author Mark Fisher
+ * @author Juergen Hoeller
  * @since 3.0.5
  * @param <T> the object type
+ * @see Deserializer
  */
 @FunctionalInterface
 public interface Serializer<T> {
@@ -41,4 +44,17 @@ public interface Serializer<T> {
 	 */
 	void serialize(T object, OutputStream outputStream) throws IOException;
 
+	/**
+	 * Turn an object of type T into a serialized byte array.
+	 * @param object the object to serialize
+	 * @return the resulting byte array
+	 * @throws IOException in case of serialization failure
+	 * @since 5.2.7
+	 */
+	default byte[] serializeToByteArray(T object) throws IOException {
+		ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
+		serialize(object, out);
+		return out.toByteArray();
+	}
+
 }

spring-core/src/main/java/org/springframework/core/serializer/support/SerializingConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,8 +16,6 @@
 
 package org.springframework.core.serializer.support;
 
-import java.io.ByteArrayOutputStream;
-
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.serializer.DefaultSerializer;
 import org.springframework.core.serializer.Serializer;
@@ -58,10 +56,8 @@ public class SerializingConverter implements Converter<Object, byte[]> {
 	 */
 	@Override
 	public byte[] convert(Object source) {
-		ByteArrayOutputStream byteStream = new ByteArrayOutputStream(1024);
 		try  {
-			this.serializer.serialize(source, byteStream);
+			return this.serializer.serializeToByteArray(source);
-			return byteStream.toByteArray();
 		}
 		catch (Throwable ex) {
 			throw new SerializationFailedException("Failed to serialize object using " +