org.springframework.data.gemfire.config.DiskStoreBeanPostProcessor Maven / Gradle / Ivy
/*
* Copyright 2010-2013 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
*
* http://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.data.gemfire.config;
import java.io.File;
import java.lang.reflect.Field;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.data.gemfire.DiskStoreFactoryBean.DiskDir;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* The DiskStoreBeanPostProcessor class post processes any GemFire Disk Store DiskDir Spring beans defined
* in the application context to ensure that the Disk Store directory location (disk-dir) actually exists
* before creating the Disk Store.
*
* @author John Blum
* @see org.springframework.beans.factory.config.BeanPostProcessor
* @see org.springframework.data.gemfire.DiskStoreFactoryBean.DiskDir
* @since 1.5.0
*/
@SuppressWarnings("unused")
public class DiskStoreBeanPostProcessor implements BeanPostProcessor {
protected final Log log = LogFactory.getLog(getClass());
@Override
public Object postProcessBeforeInitialization(final Object bean, final String beanName) throws BeansException {
if (log.isDebugEnabled()) {
log.debug(String.format("Post Processing Bean (%1$s) of Type (%2$s) with Name (%3$s)...%n", bean,
ObjectUtils.nullSafeClassName(bean), beanName));
}
if (bean instanceof DiskDir) {
createIfNotExists((DiskDir) bean);
}
return bean;
}
private void createIfNotExists(final DiskDir diskDirectory) {
String location = readField(diskDirectory, "location");
File diskDirectoryFile = new File(location);
Assert.isTrue(diskDirectoryFile.isDirectory() || diskDirectoryFile.mkdirs(),
String.format("Failed to create Disk Directory (%1$s)%n!", location));
if (log.isInfoEnabled()) {
log.info(String.format("The Disk Directory either exists or was created @ Location (%1$s).%n", location));
}
}
@SuppressWarnings("unchecked")
private T readField(final Object obj, final String fieldName) {
try {
Class type = obj.getClass();
Field field;
do {
field = type.getDeclaredField(fieldName);
type = type.getSuperclass(); // traverse up the object class hierarchy
}
while (field == null && !Object.class.equals(type));
if (field == null) {
throw new NoSuchFieldException(String.format("Field (%1$s) does not exist on Object of type (%2$s)!",
fieldName, ObjectUtils.nullSafeClassName(obj)));
}
field.setAccessible(true);
return (T) field.get(obj);
}
catch (Exception e) {
throw new RuntimeException(String.format("Failed to read field (%1$s) on Object of type (%2$s)!",
fieldName, ObjectUtils.nullSafeClassName(obj)), e);
}
}
@Override
public Object postProcessAfterInitialization(final Object bean, final String beanName) throws BeansException {
return bean;
}
}