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The Core Camel Java DSL based router
/**
* 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
*
* 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.apache.camel.management.mbean;
import java.io.InputStream;
import java.util.Stack;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.camel.CamelContext;
import org.apache.camel.api.management.mbean.ManagedProcessorMBean;
import org.apache.camel.api.management.mbean.ManagedRouteMBean;
/**
* An XML parser that uses SAX to enrich route stats in the route dump.
*
* The coverage details:
*
* - exchangesTotal - Total number of exchanges
* - totalProcessingTime - Total processing time in millis
*
* Is included as attributes on the route nodes.
*/
public final class RouteCoverageXmlParser {
private RouteCoverageXmlParser() {
}
/**
* Parses the XML.
*
* @param camelContext the CamelContext
* @param is the XML content as an input stream
* @return the DOM model of the routes with coverage information stored as attributes
* @throws Exception is thrown if error parsing
*/
public static Document parseXml(final CamelContext camelContext, final InputStream is) throws Exception {
final SAXParserFactory factory = SAXParserFactory.newInstance();
final SAXParser parser = factory.newSAXParser();
final DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
final DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
final Document doc = docBuilder.newDocument();
final Stack elementStack = new Stack();
final StringBuilder textBuffer = new StringBuilder();
final DefaultHandler handler = new DefaultHandler() {
@Override
public void setDocumentLocator(final Locator locator) {
// noop
}
@Override
public void startElement(final String uri, final String localName, final String qName, final Attributes attributes) throws SAXException {
addTextIfNeeded();
final Element el = doc.createElement(qName);
// add other elements
for (int i = 0; i < attributes.getLength(); i++) {
el.setAttribute(attributes.getQName(i), attributes.getValue(i));
}
String id = el.getAttribute("id");
if (id != null) {
try {
if ("route".equals(qName)) {
ManagedRouteMBean route = camelContext.getManagedRoute(id, ManagedRouteMBean.class);
if (route != null) {
long total = route.getExchangesTotal();
el.setAttribute("exchangesTotal", "" + total);
long totalTime = route.getTotalProcessingTime();
el.setAttribute("totalProcessingTime", "" + totalTime);
}
} else if ("from".equals(qName)) {
// grab statistics from the parent route as from would be the same
Element parent = elementStack.peek();
if (parent != null) {
String routeId = parent.getAttribute("id");
ManagedRouteMBean route = camelContext.getManagedRoute(routeId, ManagedRouteMBean.class);
if (route != null) {
long total = route.getExchangesTotal();
el.setAttribute("exchangesTotal", "" + total);
long totalTime = route.getTotalProcessingTime();
el.setAttribute("totalProcessingTime", "" + totalTime);
// from is index-0
el.setAttribute("index", "0");
}
}
} else {
ManagedProcessorMBean processor = camelContext.getManagedProcessor(id, ManagedProcessorMBean.class);
if (processor != null) {
long total = processor.getExchangesTotal();
el.setAttribute("exchangesTotal", "" + total);
long totalTime = processor.getTotalProcessingTime();
el.setAttribute("totalProcessingTime", "" + totalTime);
int index = processor.getIndex();
el.setAttribute("index", "" + index);
}
}
} catch (Exception e) {
// ignore
}
}
// we do not want customId in output of the EIPs
if (!"route".equals(qName)) {
el.removeAttribute("customId");
}
elementStack.push(el);
}
@Override
public void endElement(final String uri, final String localName, final String qName) {
addTextIfNeeded();
final Element closedEl = elementStack.pop();
if (elementStack.isEmpty()) {
// is this the root element?
doc.appendChild(closedEl);
} else {
final Element parentEl = elementStack.peek();
parentEl.appendChild(closedEl);
}
}
@Override
public void characters(final char ch[], final int start, final int length) throws SAXException {
textBuffer.append(ch, start, length);
}
/**
* outputs text accumulated under the current node
*/
private void addTextIfNeeded() {
if (textBuffer.length() > 0) {
final Element el = elementStack.peek();
final Node textNode = doc.createTextNode(textBuffer.toString());
el.appendChild(textNode);
textBuffer.delete(0, textBuffer.length());
}
}
};
parser.parse(is, handler);
return doc;
}
}