spring DaoSupport 源码
spring DaoSupport 代码
文件路径：/spring-tx/src/main/java/org/springframework/dao/support/DaoSupport.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.dao.support;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.InitializingBean;
/**
* Generic base class for DAOs, defining template methods for DAO initialization.
*
* <p>Extended by Spring's specific DAO support classes, such as:
* JdbcDaoSupport, JdoDaoSupport, etc.
*
* @author Juergen Hoeller
* @since 1.2.2
* @see org.springframework.jdbc.core.support.JdbcDaoSupport
*/
public abstract class DaoSupport implements InitializingBean {
/** Logger available to subclasses. */
protected final Log logger = LogFactory.getLog(getClass());
@Override
public final void afterPropertiesSet() throws IllegalArgumentException, BeanInitializationException {
// Let abstract subclasses check their configuration.
checkDaoConfig();
// Let concrete implementations initialize themselves.
try {
initDao();
}
catch (Exception ex) {
throw new BeanInitializationException("Initialization of DAO failed", ex);
}
}
/**
* Abstract subclasses must override this to check their configuration.
* <p>Implementors should be marked as {@code final} if concrete subclasses
* are not supposed to override this template method themselves.
* @throws IllegalArgumentException in case of illegal configuration
*/
protected abstract void checkDaoConfig() throws IllegalArgumentException;
/**
* Concrete subclasses can override this for custom initialization behavior.
* Gets called after population of this instance's bean properties.
* @throws Exception if DAO initialization fails
* (will be rethrown as a BeanInitializationException)
* @see org.springframework.beans.factory.BeanInitializationException
*/
protected void initDao() throws Exception {
}
}
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