/**
* 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
* regarding copyright ownership. The ASF licenses this file
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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.apache.hadoop.gateway.ha.provider.impl;
import org.apache.hadoop.gateway.ha.provider.HaDescriptor;
import org.apache.hadoop.gateway.ha.provider.HaServiceConfig;
import org.apache.hadoop.gateway.ha.provider.impl.i18n.HaMessages;
import org.apache.hadoop.gateway.i18n.messages.MessagesFactory;
import org.apache.hadoop.gateway.util.XmlUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.List;
public class HaDescriptorManager implements HaDescriptorConstants {
private static final HaMessages LOG = MessagesFactory.get(HaMessages.class);
public static void store(HaDescriptor descriptor, Writer writer) throws IOException {
try {
Document document = XmlUtils.createDocument();
Element root = document.createElement(ROOT_ELEMENT);
document.appendChild(root);
List<HaServiceConfig> serviceConfigs = descriptor.getServiceConfigs();
if (serviceConfigs != null && !serviceConfigs.isEmpty()) {
for (HaServiceConfig config : serviceConfigs) {
Element serviceElement = document.createElement(SERVICE_ELEMENT);
serviceElement.setAttribute(SERVICE_NAME_ATTRIBUTE, config.getServiceName());
serviceElement.setAttribute(MAX_FAILOVER_ATTEMPTS, Integer.toString(config.getMaxFailoverAttempts()));
serviceElement.setAttribute(FAILOVER_SLEEP, Integer.toString(config.getFailoverSleep()));
serviceElement.setAttribute(MAX_RETRY_ATTEMPTS, Integer.toString(config.getMaxRetryAttempts()));
serviceElement.setAttribute(RETRY_SLEEP, Integer.toString(config.getRetrySleep()));
serviceElement.setAttribute(ENABLED_ATTRIBUTE, Boolean.toString(config.isEnabled()));
if (config.getZookeeperEnsemble() != null) {
serviceElement.setAttribute(ZOOKEEPER_ENSEMBLE, config.getZookeeperEnsemble());
}
if (config.getZookeeperNamespace() != null) {
serviceElement.setAttribute(ZOOKEEPER_NAMESPACE, config.getZookeeperNamespace());
}
root.appendChild(serviceElement);
}
}
Transformer t = XmlUtils.getTransformer( true, true, 2, false );
XmlUtils.writeXml( document, writer, t );
} catch (ParserConfigurationException e) {
LOG.failedToWriteHaDescriptor(e);
throw new IOException(e);
} catch (TransformerException e) {
LOG.failedToWriteHaDescriptor(e);
throw new IOException(e);
}
}
public static HaDescriptor load(InputStream inputStream) throws IOException {
HaDescriptor descriptor = HaDescriptorFactory.createDescriptor();
try {
Document document = XmlUtils.readXml( inputStream );
NodeList nodeList = document.getElementsByTagName(SERVICE_ELEMENT);
if (nodeList != null && nodeList.getLength() > 0) {
for (int i = 0; i < nodeList.getLength(); i++) {
Element element = (Element) nodeList.item(i);
HaServiceConfig config = HaDescriptorFactory.createServiceConfig(element.getAttribute(SERVICE_NAME_ATTRIBUTE),
element.getAttribute(ENABLED_ATTRIBUTE),
element.getAttribute(MAX_FAILOVER_ATTEMPTS),
element.getAttribute(FAILOVER_SLEEP),
element.getAttribute(MAX_RETRY_ATTEMPTS),
element.getAttribute(RETRY_SLEEP),
element.getAttribute(ZOOKEEPER_ENSEMBLE),
element.getAttribute(ZOOKEEPER_NAMESPACE));
descriptor.addServiceConfig(config);
}
}
} catch (ParserConfigurationException e) {
LOG.failedToLoadHaDescriptor(e);
throw new IOException(e);
} catch (SAXException e) {
LOG.failedToLoadHaDescriptor(e);
throw new IOException(e);
}
return descriptor;
}
}