com.ibm.jbatch.container.services.impl.DelegatingJobXMLLoaderServiceImpl Maven / Gradle / Ivy
/*
* 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.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.ibm.jbatch.container.exception.BatchContainerRuntimeException;
import com.ibm.jbatch.container.exception.BatchContainerServiceException;
import com.ibm.jbatch.container.servicesmanager.ServicesManagerImpl;
import com.ibm.jbatch.spi.services.IBatchConfig;
import com.ibm.jbatch.spi.services.IJobXMLLoaderService;
public class DelegatingJobXMLLoaderServiceImpl implements IJobXMLLoaderService {
private final static Logger logger = Logger.getLogger(DelegatingBatchArtifactFactoryImpl.class.getName());
private final static String CLASSNAME = DelegatingBatchArtifactFactoryImpl.class.getName();
protected static IJobXMLLoaderService preferredJobXmlLoader = ServicesManagerImpl.getInstance().getPreferredJobXMLLoaderService();
public static final String PREFIX = "META-INF/batch-jobs/";
@Override
public String loadJSL(String id) {
String method = "loadJob";
logger.entering(CLASSNAME, method);
String jobXML = null;
if (!preferredJobXmlLoader.getClass().equals(this.getClass())) {
jobXML = preferredJobXmlLoader.loadJSL(id);
} else {
if (logger.isLoggable(Level.FINER)) {
logger.log(Level.FINER, "No preferred job xml loader is detected in configuration");
}
}
if (jobXML != null) {
if (logger.isLoggable(Level.FINER)) {
logger.log(Level.FINER, "Preferred job xml loader loaded job with id " + id +".");
}
return jobXML;
}
if (logger.isLoggable(Level.FINER)) {
logger.log(Level.FINER, "Preferred job xml loader failed to load " + id +". Defaulting to " + PREFIX);
}
jobXML = loadJobFromBatchJobs(id);
if (jobXML == null) {
if (logger.isLoggable(Level.FINER)) {
logger.log(Level.FINER, "Failed to load " + id +" from " + PREFIX);
}
throw new BatchContainerServiceException("Could not load job xml with id: " + id);
}
if (logger.isLoggable(Level.FINER)) {
logger.log(Level.FINER, "Loaded job xml with " + id +" from " + PREFIX);
}
return jobXML;
}
private static String loadJobFromBatchJobs(String id) {
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
String relativePath = PREFIX + id + ".xml";
InputStream stream = tccl.getResourceAsStream(relativePath);
if (stream == null) {
throw new BatchContainerRuntimeException(new FileNotFoundException(
"Cannot find an XML file under " + PREFIX + " with the following name " + id + ".xml"));
}
return readJobXML(stream);
}
private static String readJobXML(InputStream stream) {
StringBuffer out = new StringBuffer();
try {
byte[] b = new byte[4096];
for (int i; (i = stream.read(b)) != -1;) {
out.append(new String(b, 0, i));
}
} catch (FileNotFoundException e) {
throw new BatchContainerServiceException(e);
} catch (IOException e) {
throw new BatchContainerServiceException(e);
}
return out.toString();
}
@Override
public void init(IBatchConfig batchConfig) throws BatchContainerServiceException {
// TODO Auto-generated method stub
}
@Override
public void shutdown() throws BatchContainerServiceException {
// TODO Auto-generated method stub
}
}