Make charset configurable in JdbcExecutionContextDao

Issue spring-projects#795

spring-batch-core/src/main/java/org/springframework/batch/core/explore/support/JobExplorerFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -16,6 +16,9 @@
 
 package org.springframework.batch.core.explore.support;
 
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+
 import javax.sql.DataSource;
 
 import org.springframework.batch.core.explore.JobExplorer;
@@ -38,6 +41,7 @@
 import org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer;
 import org.springframework.jdbc.support.incrementer.DataFieldMaxValueIncrementer;
 import org.springframework.jdbc.support.lob.LobHandler;
+import org.springframework.lang.NonNull;
 import org.springframework.util.Assert;
 
 /**
@@ -69,6 +73,8 @@ protected long getNextKey() {
 
 	private ExecutionContextSerializer serializer;
 
+	private Charset charset = StandardCharsets.UTF_8;
+
 	/**
 	 * A custom implementation of the {@link ExecutionContextSerializer}.
 	 * The default, if not injected, is the {@link Jackson2ExecutionContextStringSerializer}.
@@ -118,6 +124,18 @@ public void setLobHandler(LobHandler lobHandler) {
 		this.lobHandler = lobHandler;
 	}
 
+	/**
+	 * Set the {@link Charset} to use when deserializing the execution context.
+	 * Defaults to "UTF-8". Must not be {@code null}.
+	 * @param charset to use when deserializing the execution context.
+	 * @see JdbcExecutionContextDao#setCharset(Charset)
+	 * @since 5.0
+	 */
+	public void setCharset(@NonNull Charset charset) {
+		Assert.notNull(charset, "Charset must not be null");
+		this.charset = charset;
+	}
+
 	@Override
 	public void afterPropertiesSet() throws Exception {
 
@@ -145,6 +163,7 @@ protected ExecutionContextDao createExecutionContextDao() throws Exception {
 		dao.setLobHandler(lobHandler);
 		dao.setTablePrefix(tablePrefix);
 		dao.setSerializer(serializer);
+		dao.setCharset(charset);
 		dao.afterPropertiesSet();
 		return dao;
 	}

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/JdbcExecutionContextDao.java

@@ -19,6 +19,7 @@
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
@@ -40,6 +41,7 @@
 import org.springframework.jdbc.core.RowMapper;
 import org.springframework.jdbc.support.lob.DefaultLobHandler;
 import org.springframework.jdbc.support.lob.LobHandler;
+import org.springframework.lang.NonNull;
 import org.springframework.util.Assert;
 
 /**
@@ -75,7 +77,7 @@ public class JdbcExecutionContextDao extends AbstractJdbcBatchMetadataDao implem
 	private static final String UPDATE_STEP_EXECUTION_CONTEXT = "UPDATE %PREFIX%STEP_EXECUTION_CONTEXT "
 			+ "SET SHORT_CONTEXT = ?, SERIALIZED_CONTEXT = ? " + "WHERE STEP_EXECUTION_ID = ?";
 
-	private static final String CHARSET_NAME = StandardCharsets.UTF_8.name();
+	private Charset charset = StandardCharsets.UTF_8;
 
 	private static final int DEFAULT_MAX_VARCHAR_LENGTH = 2500;
 
@@ -109,6 +111,17 @@ public void setShortContextLength(int shortContextLength) {
 		this.shortContextLength = shortContextLength;
 	}
 
+	/**
+	 * Set the {@link Charset} to use when serializing/deserializing the execution context.
+	 * Must not be {@code null}. Defaults to "UTF-8".
+	 * @param charset to use when serializing/deserializing the execution context.
+	 * @since 5.0
+	 */
+	public void setCharset(@NonNull Charset charset) {
+		Assert.notNull(charset, "Charset must not be null");
+		this.charset = charset;
+	}
+
 	@Override
 	public ExecutionContext getExecutionContext(JobExecution jobExecution) {
 		Long executionId = jobExecution.getId();
@@ -303,7 +316,7 @@ private String serializeContext(ExecutionContext ctx) {
 
 		try {
 			serializer.serialize(m, out);
-			results = new String(out.toByteArray(), CHARSET_NAME);
+			results = new String(out.toByteArray(), charset.name());
 		}
 		catch (IOException ioe) {
 			throw new IllegalArgumentException("Could not serialize the execution context", ioe);
@@ -324,7 +337,7 @@ public ExecutionContext mapRow(ResultSet rs, int i) throws SQLException {
 
 			Map<String, Object> map;
 			try {
-				ByteArrayInputStream in = new ByteArrayInputStream(serializedContext.getBytes(CHARSET_NAME));
+				ByteArrayInputStream in = new ByteArrayInputStream(serializedContext.getBytes(charset.name()));
 				map = serializer.deserialize(in);
 			}
 			catch (IOException ioe) {

spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/JobRepositoryFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -17,6 +17,8 @@
 package org.springframework.batch.core.repository.support;
 
 import java.lang.reflect.Field;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.sql.Types;
 import javax.sql.DataSource;
 
@@ -43,6 +45,7 @@
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.support.lob.DefaultLobHandler;
 import org.springframework.jdbc.support.lob.LobHandler;
+import org.springframework.lang.NonNull;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -82,6 +85,8 @@ public class JobRepositoryFactoryBean extends AbstractJobRepositoryFactoryBean i
 
 	private Integer lobType;
 
+	private Charset charset = StandardCharsets.UTF_8;
+
 	/**
 	 * @param type a value from the {@link java.sql.Types} class to indicate the type to use for a CLOB
 	 */
@@ -167,6 +172,18 @@ public void setIncrementerFactory(DataFieldMaxValueIncrementerFactory incremente
 		this.incrementerFactory = incrementerFactory;
 	}
 
+	/**
+	 * Set the {@link Charset} to use when serializing/deserializing the execution context.
+	 * Defaults to "UTF-8". Must not be {@code null}.
+	 * @param charset to use when serializing/deserializing the execution context.
+	 * @see JdbcExecutionContextDao#setCharset(Charset)
+	 * @since 5.0
+	 */
+	public void setCharset(@NonNull Charset charset) {
+		Assert.notNull(charset, "Charset must not be null");
+		this.charset = charset;
+	}
+
 	@Override
 	public void afterPropertiesSet() throws Exception {
 
@@ -251,6 +268,7 @@ protected ExecutionContextDao createExecutionContextDao() throws Exception {
 		dao.setTablePrefix(tablePrefix);
 		dao.setClobTypeToUse(determineClobTypeToUse(this.databaseType));
 		dao.setSerializer(serializer);
+		dao.setCharset(charset);
 
 		if (lobHandler != null) {
 			dao.setLobHandler(lobHandler);