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/*
* Copyright 2012 International Business Machines Corp.
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. 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 com.ibm.jbatch.container.services.impl;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import com.ibm.jbatch.container.exception.BatchContainerServiceException;
import com.ibm.jbatch.spi.services.IBatchArtifactFactory;
import com.ibm.jbatch.spi.services.IBatchConfig;
import com.ibm.jbatch.container.cdi.BatchXMLMapper;
import jakarta.enterprise.inject.AmbiguousResolutionException;
import jakarta.enterprise.inject.spi.Bean;
import jakarta.enterprise.inject.spi.BeanManager;
public class CDIBatchArtifactFactoryImpl implements IBatchArtifactFactory {
private final static Logger logger = Logger.getLogger(CDIBatchArtifactFactoryImpl.class.getName());
private final static String CLASSNAME = CDIBatchArtifactFactoryImpl.class.getName();
@Override
public Object load(String batchId) {
String methodName = "load";
if (logger.isLoggable(Level.FINER)) {
logger.entering(CLASSNAME, methodName, "Loading batch artifact id = " + batchId);
}
Object loadedArtifact = getArtifactById(batchId);
if (loadedArtifact != null) {
if (logger.isLoggable(Level.FINER)) {
logger.exiting(CLASSNAME, methodName, "For batch artifact id = " + batchId + ", loaded artifact instance: " + loadedArtifact
+ " of type: " + loadedArtifact.getClass().getCanonicalName());
}
} else {
if (logger.isLoggable(Level.FINER)) {
logger.exiting(CLASSNAME, methodName, "For batch artifact id = " + batchId + ", FAILED to load artifact instance");
}
}
return loadedArtifact;
}
protected BeanManager obtainBeanManager() throws NamingException {
InitialContext initialContext = new InitialContext();
return (BeanManager) initialContext.lookup("java:comp/BeanManager");
}
private Object getArtifactById(String id) {
Object artifactInstance = null;
try {
final BeanManager bm = obtainBeanManager();
final Bean bean = (bm != null) ? getBeanById(bm, id) : null;
final Class clazz = bean.getBeanClass();
artifactInstance = bm.getReference(bean, clazz, bm.createCreationalContext(bean));
} catch (Exception e) {
// Don't throw an exception but simply return null;
logger.fine("Tried but failed to load artifact with id: " + id + ", Exception = " + e);
}
return artifactInstance;
}
/**
* @param id Either the EL name of the bean, its id in batch.xml, or its fully qualified class name.
*
* @return the bean for the given artifact id.
*/
protected Bean getBeanById(BeanManager bm, String id) {
Bean match = getUniqueBeanByBeanName(bm, id);
if (match == null) {
match = getUniqueBeanForBatchXMLEntry(bm, id);
}
if (match == null) {
match = getUniqueBeanForClassName(bm, id);
}
return match;
}
/**
* Use the given BeanManager to lookup a unique CDI-registered bean
* with bean name equal to 'batchId', using EL matching rules.
*
* @return the bean with the given bean name, or 'null' if there is an ambiguous resolution
*/
protected Bean getUniqueBeanByBeanName(BeanManager bm, String batchId) {
Bean match = null;
// Get all beans with the given EL name (id). EL names are applied via @Named.
// If the bean is not annotated with @Named, then it does not have an EL name
// and therefore can't be looked up that way.
Set> beans = bm.getBeans(batchId);
try {
match = bm.resolve(beans);
} catch (AmbiguousResolutionException e) {
return null;
}
return match;
}
/**
* Use the given BeanManager to lookup a unique CDI-registered bean
* with bean class equal to the batch.xml entry mapped to be the batchId parameter
*
* @return the bean with the given className. It returns null if there are zero matches or if there is no umabiguous resolution (i.e. more than 1 match)
*/
protected Bean getUniqueBeanForBatchXMLEntry(BeanManager bm, String batchId) {
ClassLoader loader = getContextClassLoader();
BatchXMLMapper batchXMLMapper = new BatchXMLMapper(loader);
Class clazz = batchXMLMapper.getArtifactById(batchId);
if (clazz != null) {
try {
return findUniqueBeanForClass(bm, clazz);
} catch (AmbiguousResolutionException e) {
if (logger.isLoggable(Level.FINER)) {
logger.finer("getBeanForBatchXML: BatchCDIAmbiguousResolutionCheckedException: " + e.getMessage());
}
return null;
}
} else {
return null;
}
}
protected Bean getUniqueBeanForClassName(BeanManager bm, String className) {
// Ignore exceptions since will just failover to another loading mechanism
try {
Class clazz = getContextClassLoader().loadClass(className);
return findUniqueBeanForClass(bm, clazz);
} catch (AmbiguousResolutionException e) {
if (logger.isLoggable(Level.FINER)) {
logger.finer("getBeanForClassName: BatchCDIAmbiguousResolutionCheckedException: " + e.getMessage());
}
return null;
} catch (ClassNotFoundException cnfe) {
if (logger.isLoggable(Level.FINER)) {
logger.finer("getBeanForClassName: ClassNotFoundException for " + className + ": " + cnfe);
}
return null;
}
}
/**
* @return the bean within the given set whose class matches the given clazz.
* @throws BatchCDIAmbiguousResolutionCheckedException if more than one match is found
*/
protected Bean findUniqueBeanForClass(BeanManager beanManager, Class clazz) throws AmbiguousResolutionException {
Set> matches = new HashSet>();
Bean retVal = null;
Set> beans = beanManager.getBeans(clazz);
if (beans == null || beans.isEmpty()) {
if (logger.isLoggable(Level.FINER)) {
logger.finer("In findBeanForClass: found empty set or null for class: " + clazz);
}
return null;
}
if (logger.isLoggable(Level.FINER)) {
logger.finer("In findBeanForClass: found non-empty set: " + beans + " for class: " + clazz);
}
for (Bean bean : beans) {
if (bean.getBeanClass().equals(clazz)) {
matches.add(bean);
}
}
try {
retVal = beanManager.resolve(matches);
} catch (AmbiguousResolutionException e) {
throw new AmbiguousResolutionException("Found beans = " + matches + ", and could not resolve unambiguously");
}
return retVal;
}
/**
* @return thread context classloader
*/
protected ClassLoader getContextClassLoader() {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
});
}
@Override
public void init(IBatchConfig batchConfig) throws BatchContainerServiceException {
logger.fine("Initializing CDIBatchArtifactFactoryImpl");
}
@Override
public void shutdown() throws BatchContainerServiceException {
logger.fine("Shutdown CDIBatchArtifactFactoryImpl");
}
}
