org.apache.causeway.persistence.jdo.spring.support.OpenPersistenceManagerInViewInterceptor Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
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* to you 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.causeway.persistence.jdo.spring.support;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.ui.ModelMap;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.context.request.WebRequestInterceptor;
import org.apache.causeway.persistence.jdo.spring.integration.PersistenceManagerFactoryUtils;
import org.apache.causeway.persistence.jdo.spring.integration.PersistenceManagerHolder;
/**
* Spring web request interceptor that binds a JDO PersistenceManager to the
* thread for the entire processing of the request. Intended for the "Open
* PersistenceManager in View" pattern, i.e. to allow for lazy loading in
* web views despite the original transactions already being completed.
*
* This interceptor makes JDO PersistenceManagers available via the current thread,
* which will be autodetected by transaction managers. It is suitable for service
* layer transactions via {@link org.apache.causeway.persistence.jdo.spring.integration.JdoTransactionManager}
* or {@link org.springframework.transaction.jta.JtaTransactionManager} as well
* as for non-transactional read-only execution.
*
*
In contrast to {@link OpenPersistenceManagerInViewFilter}, this interceptor
* is set up in a Spring application context and can thus take advantage of
* bean wiring.
*
* @see OpenPersistenceManagerInViewFilter
* @see org.apache.causeway.persistence.jdo.spring.integration.JdoTransactionManager
* @see org.apache.causeway.persistence.jdo.spring.integration.PersistenceManagerFactoryUtils#getPersistenceManager
* @see org.springframework.transaction.support.TransactionSynchronizationManager
*/
public class OpenPersistenceManagerInViewInterceptor implements WebRequestInterceptor {
/**
* Suffix that gets appended to the PersistenceManagerFactory toString
* representation for the "participate in existing persistence manager
* handling" request attribute.
* @see #getParticipateAttributeName
*/
public static final String PARTICIPATE_SUFFIX = ".PARTICIPATE";
protected final Log logger = LogFactory.getLog(getClass());
private PersistenceManagerFactory persistenceManagerFactory;
/**
* Set the JDO PersistenceManagerFactory that should be used to create
* PersistenceManagers.
*/
public void setPersistenceManagerFactory(PersistenceManagerFactory pmf) {
this.persistenceManagerFactory = pmf;
}
/**
* Return the JDO PersistenceManagerFactory that should be used to create
* PersistenceManagers.
*/
public PersistenceManagerFactory getPersistenceManagerFactory() {
return persistenceManagerFactory;
}
@Override
public void preHandle(WebRequest request) throws DataAccessException {
if (TransactionSynchronizationManager.hasResource(getPersistenceManagerFactory())) {
// Do not modify the PersistenceManager: just mark the request accordingly.
String participateAttributeName = getParticipateAttributeName();
Integer count = (Integer) request.getAttribute(participateAttributeName, WebRequest.SCOPE_REQUEST);
int newCount = (count != null ? count + 1 : 1);
request.setAttribute(getParticipateAttributeName(), newCount, WebRequest.SCOPE_REQUEST);
}
else {
logger.debug("Opening JDO PersistenceManager in OpenPersistenceManagerInViewInterceptor");
PersistenceManager pm =
PersistenceManagerFactoryUtils.getPersistenceManager(getPersistenceManagerFactory(), true);
TransactionSynchronizationManager.bindResource(
getPersistenceManagerFactory(), new PersistenceManagerHolder(pm));
}
}
@Override
public void postHandle(WebRequest request, ModelMap model) {
}
@Override
public void afterCompletion(WebRequest request, Exception ex) throws DataAccessException {
String participateAttributeName = getParticipateAttributeName();
Integer count = (Integer) request.getAttribute(participateAttributeName, WebRequest.SCOPE_REQUEST);
if (count != null) {
// Do not modify the PersistenceManager: just clear the marker.
if (count > 1) {
request.setAttribute(participateAttributeName, count - 1, WebRequest.SCOPE_REQUEST);
}
else {
request.removeAttribute(participateAttributeName, WebRequest.SCOPE_REQUEST);
}
}
else {
PersistenceManagerHolder pmHolder = (PersistenceManagerHolder)
TransactionSynchronizationManager.unbindResource(getPersistenceManagerFactory());
logger.debug("Closing JDO PersistenceManager in OpenPersistenceManagerInViewInterceptor");
PersistenceManagerFactoryUtils.releasePersistenceManager(
pmHolder.getPersistenceManager(), getPersistenceManagerFactory());
}
}
/**
* Return the name of the request attribute that identifies that a request is
* already filtered. Default implementation takes the toString representation
* of the PersistenceManagerFactory instance and appends ".FILTERED".
* @see #PARTICIPATE_SUFFIX
*/
protected String getParticipateAttributeName() {
return getPersistenceManagerFactory().toString() + PARTICIPATE_SUFFIX;
}
}