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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.statistics;
import org.apache.geode.*;
import org.apache.geode.internal.Assert;
import org.apache.geode.internal.ClassPathLoader;
import org.apache.geode.internal.i18n.LocalizedStrings;
import java.io.*;
import java.util.*;
import javax.xml.parsers.*;
// import javax.xml.transform.*;
// import javax.xml.transform.dom.*;
// import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.*;
// @todo davidw Use a SAX parser instead of DOM
/**
* This is an internal helper class for dealing with the SessionFactory XML configuration files.
*/
public class StatisticsTypeXml implements EntityResolver, ErrorHandler {
/** The name of the DTD file */
static final String DTD = "statisticsType.dtd";
static final String systemId = "http://www.gemstone.com/dtd/" + DTD;
static final String publicId = "-//GemStone Systems, Inc.//GemFire StatisticsType//EN";
///////////////////// Interface methods ///////////////////////
/**
* Given a publicId, attempts to resolve it to a DTD. Returns an InputSource for the
* DTD.
*/
public InputSource resolveEntity(String publicId, String systemId) throws SAXException {
// Figure out the location for the publicId. Be tolerant of other
// versions of the dtd
if (publicId.equals(StatisticsTypeXml.publicId) || systemId.equals(StatisticsTypeXml.systemId)
|| systemId.endsWith(DTD)) {
// Public ID for system config DTD
String location = "/org/apache/geode/" + DTD;
InputStream stream = ClassPathLoader.getLatest().getResourceAsStream(getClass(), location);
if (stream != null) {
return new InputSource(stream);
} else {
throw new SAXNotRecognizedException(
LocalizedStrings.StatisticsTypeXml_DTD_NOT_FOUND_0.toLocalizedString(location));
}
} else {
throw new SAXNotRecognizedException(
LocalizedStrings.StatisticsTypeXml_INVALID_PUBLIC_ID_0.toLocalizedString(publicId));
}
}
public void warning(SAXParseException exception) throws SAXException {
// We don't want to thrown an exception. We want to log it!!
// FIXME
// String s = "SAX warning while working with XML";
}
public void error(SAXParseException exception) throws SAXException {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_SAX_ERROR_WHILE_WORKING_WITH_XML.toLocalizedString(),
exception);
}
public void fatalError(SAXParseException exception) throws SAXException {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_SAX_FATAL_ERROR_WHILE_WORKING_WITH_XML
.toLocalizedString(),
exception);
}
////////////////////// Parsing XML File ////////////////////////
/**
* Parses the contents of XML data and from it creates one or more StatisticsType
* instances.
*/
public StatisticsType[] read(Reader reader, StatisticsTypeFactory statFactory) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
// factory.setValidating(validate);
DocumentBuilder parser = null;
try {
parser = factory.newDocumentBuilder();
} catch (ParserConfigurationException ex) {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_FAILED_PARSING_XML.toLocalizedString(), ex);
}
parser.setErrorHandler(this);
parser.setEntityResolver(this);
Document doc;
try {
doc = parser.parse(new InputSource(reader));
} catch (SAXException se) {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_FAILED_PARSING_XML.toLocalizedString(), se);
} catch (IOException io) {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_FAILED_READING_XML_DATA.toLocalizedString(), io);
}
if (doc == null) {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_FAILED_READING_XML_DATA_NO_DOCUMENT
.toLocalizedString());
}
Element root = doc.getDocumentElement();
if (root == null) {
throw new GemFireConfigException(
LocalizedStrings.StatisticsTypeXml_FAILED_READING_XML_DATA_NO_ROOT_ELEMENT
.toLocalizedString());
}
return extractStatistics(root, statFactory);
}
/*
*
*/
private StatisticsType[] extractStatistics(Element root, StatisticsTypeFactory statFactory) {
Assert.assertTrue(root.getTagName().equals("statistics"));
ArrayList types = new ArrayList();
NodeList typeNodes = root.getElementsByTagName("type");
for (int i = 0; i < typeNodes.getLength(); i++) {
Element typeNode = (Element) typeNodes.item(i);
types.add(extractType(typeNode, statFactory));
}
return (StatisticsType[]) types.toArray(new StatisticsType[types.size()]);
}
/**
*
*/
private StatisticsType extractType(Element typeNode, StatisticsTypeFactory statFactory) {
Assert.assertTrue(typeNode.getTagName().equals("type"));
Assert.assertTrue(typeNode.hasAttribute("name"));
final String typeName = typeNode.getAttribute("name");
ArrayList stats = new ArrayList();
NodeList statNodes = typeNode.getElementsByTagName("stat");
for (int i = 0; i < statNodes.getLength(); i++) {
Element statNode = (Element) statNodes.item(i);
stats.add(extractStat(statNode, statFactory));
}
StatisticDescriptor[] descriptors =
(StatisticDescriptor[]) stats.toArray(new StatisticDescriptor[stats.size()]);
String description = "";
{
NodeList descriptionNodes = typeNode.getElementsByTagName("description");
if (descriptionNodes.getLength() > 0) {
// descriptionNodes will contain the both our description, if it exists,
// and any nested stat descriptions. Ours will always be first
Element descriptionNode = (Element) descriptionNodes.item(0);
// but make sure the first one belongs to our node
if (descriptionNode.getParentNode().getNodeName().equals(typeNode.getNodeName())) {
description = extractDescription(descriptionNode);
}
}
}
return statFactory.createType(typeName, description, descriptors);
}
private final static int INT_STORAGE = 0;
private final static int LONG_STORAGE = 1;
private final static int DOUBLE_STORAGE = 2;
/**
*
*/
private StatisticDescriptor extractStat(Element statNode, StatisticsTypeFactory statFactory) {
Assert.assertTrue(statNode.getTagName().equals("stat"));
Assert.assertTrue(statNode.hasAttribute("name"));
final String statName = statNode.getAttribute("name");
String description = "";
String unit = "";
boolean isCounter = true;
boolean largerBetter;
int storage = INT_STORAGE;
if (statNode.hasAttribute("counter")) {
String value = statNode.getAttribute("counter");
Assert.assertTrue(value.equalsIgnoreCase("true") || value.equalsIgnoreCase("false"));
isCounter = Boolean.valueOf(value).booleanValue();
}
largerBetter = isCounter; // default
if (statNode.hasAttribute("largerBetter")) {
String value = statNode.getAttribute("largerBetter");
Assert.assertTrue(value.equalsIgnoreCase("true") || value.equalsIgnoreCase("false"));
largerBetter = Boolean.valueOf(value).booleanValue();
}
if (statNode.hasAttribute("storage")) {
String value = statNode.getAttribute("storage");
if (value.equalsIgnoreCase("int")) {
storage = INT_STORAGE;
} else if (value.equalsIgnoreCase("long")) {
storage = LONG_STORAGE;
} else {
Assert.assertTrue(value.equalsIgnoreCase("double"));
storage = DOUBLE_STORAGE;
}
}
{
NodeList descriptionNodes = statNode.getElementsByTagName("description");
Assert.assertTrue(descriptionNodes.getLength() <= 1);
if (descriptionNodes.getLength() == 1) {
Element descriptionNode = (Element) descriptionNodes.item(0);
description = extractDescription(descriptionNode);
}
}
{
NodeList unitNodes = statNode.getElementsByTagName("unit");
Assert.assertTrue(unitNodes.getLength() <= 1);
if (unitNodes.getLength() == 1) {
Element unitNode = (Element) unitNodes.item(0);
unit = extractUnit(unitNode);
}
}
if (isCounter) {
switch (storage) {
case INT_STORAGE:
return statFactory.createIntCounter(statName, description, unit, largerBetter);
case LONG_STORAGE:
return statFactory.createLongCounter(statName, description, unit, largerBetter);
case DOUBLE_STORAGE:
return statFactory.createDoubleCounter(statName, description, unit, largerBetter);
default:
throw new RuntimeException(LocalizedStrings.StatisticsTypeXml_UNEXPECTED_STORAGE_TYPE_0
.toLocalizedString(Integer.valueOf(storage)));
}
} else {
switch (storage) {
case INT_STORAGE:
return statFactory.createIntGauge(statName, description, unit, largerBetter);
case LONG_STORAGE:
return statFactory.createLongGauge(statName, description, unit, largerBetter);
case DOUBLE_STORAGE:
return statFactory.createDoubleGauge(statName, description, unit, largerBetter);
default:
throw new RuntimeException(LocalizedStrings.StatisticsTypeXml_UNEXPECTED_STORAGE_TYPE_0
.toLocalizedString(Integer.valueOf(storage)));
}
}
}
/**
*
*/
private String extractDescription(Element descriptionNode) {
Assert.assertTrue(descriptionNode.getTagName().equals("description"));
return extractText(descriptionNode);
}
/**
*
*/
private String extractUnit(Element unitNode) {
Assert.assertTrue(unitNode.getTagName().equals("unit"));
return extractText(unitNode);
}
private String extractText(Element element) {
Text text = (Text) element.getFirstChild();
return ((text == null ? "" : text.getData()));
}
}