spring AbstractColumnMaxValueIncrementer 源码
spring AbstractColumnMaxValueIncrementer 代码
文件路径：/spring-jdbc/src/main/java/org/springframework/jdbc/support/incrementer/AbstractColumnMaxValueIncrementer.java
/*
* Copyright 2002-2018 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.springframework.jdbc.support.incrementer;
import javax.sql.DataSource;
import org.springframework.util.Assert;
/**
* Abstract base class for {@link DataFieldMaxValueIncrementer} implementations that use
* a column in a custom sequence table. Subclasses need to provide the specific handling
* of that table in their {@link #getNextKey()} implementation.
*
* @author Juergen Hoeller
* @since 2.5.3
*/
public abstract class AbstractColumnMaxValueIncrementer extends AbstractDataFieldMaxValueIncrementer {
/** The name of the column for this sequence. */
private String columnName;
/** The number of keys buffered in a cache. */
private int cacheSize = 1;
/**
* Default constructor for bean property style usage.
* @see #setDataSource
* @see #setIncrementerName
* @see #setColumnName
*/
public AbstractColumnMaxValueIncrementer() {
}
/**
* Convenience constructor.
* @param dataSource the DataSource to use
* @param incrementerName the name of the sequence/table to use
* @param columnName the name of the column in the sequence table to use
*/
public AbstractColumnMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName) {
super(dataSource, incrementerName);
Assert.notNull(columnName, "Column name must not be null");
this.columnName = columnName;
}
/**
* Set the name of the column in the sequence table.
*/
public void setColumnName(String columnName) {
this.columnName = columnName;
}
/**
* Return the name of the column in the sequence table.
*/
public String getColumnName() {
return this.columnName;
}
/**
* Set the number of buffered keys.
*/
public void setCacheSize(int cacheSize) {
this.cacheSize = cacheSize;
}
/**
* Return the number of buffered keys.
*/
public int getCacheSize() {
return this.cacheSize;
}
@Override
public void afterPropertiesSet() {
super.afterPropertiesSet();
if (this.columnName == null) {
throw new IllegalArgumentException("Property 'columnName' is required");
}
}
}
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