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import java.io.StringReader;
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import javax.xml.transform.sax.SAXSource;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathFactory;
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import org.xml.sax.InputSource;
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import net.sf.saxon.om.NodeInfo;
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import net.sf.saxon.xpath.XPathEvaluator;
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public class XPathTest {
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public static void main(String[] args) throws Exception {
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final String xml = "<?xml version=\"1.0\"?> <message> <headers> <header name=\"CREATED_BY\"></header> <header name=\"xx.isMultipart\">true</header> <header name=\"JMSMessageID\">ID:ffffffffcbed081a:a5ab5a1:16A9D21B12A</header> <header name=\"JMSExpiration\">0</header> <header name=\"JMS_acme_ExtendedType\">x-acmeXX-multipart</header> <header name=\"JMSRedelivered\">false</header> <header name=\"JMSTimestamp\">1557414392106</header> <header name=\"JMSDeliveryMode\">2</header> <header name=\"JMSPriority\">0</header> <header name=\"JMSDestination\">t.esb.SRIUnsolicitedInboundService1</header> <header name=\"InboundEvent\">acme.apps.po.publish</header> <header name=\"CHANNEL\">AUTOMATIC</header> <header name=\"COUNTRY_CODE\">XX</header> </headers> <parts> <part type=\"text/xml\" id=\"name\"> <WfEvent> <Name>acme.apps.po.publish</Name> <Key>acme.apps.po.publish305066</Key> <Priority> <test>123</test> <test>234</test> </Priority> <SendDate>2019/05/01 12:21:40</SendDate> <ReceiveDate>null</ReceiveDate> <CorrelationId>null</CorrelationId> <Parameters> <JMSXDeliveryCount>1</JMSXDeliveryCount> <JMS_OracleConnectionID>null</JMS_OracleConnectionID> <JMSXGroupSeq>null</JMSXGroupSeq> <JMSXAppID>null</JMSXAppID> <JMSXRecvTimestamp>1556713300401</JMSXRecvTimestamp> <JMS_OracleExcpQ>null</JMS_OracleExcpQ> <JMS_OracleHeaderOnly>null</JMS_OracleHeaderOnly> <JMS_OracleOriginalMessageID>null</JMS_OracleOriginalMessageID> <JMSXGroupID>null</JMSXGroupID> <JMSXUserID>null</JMSXUserID> <JMS_OracleDeliveryMode>null</JMS_OracleDeliveryMode> <JMS_OracleDelay>0</JMS_OracleDelay> <JMSXState>0</JMSXState> </Parameters> <Data> <EVENT_DATA> <ESB_PO_PUB> <PO_NUMBER>7340017377</PO_NUMBER> <VENDOR_NUM>205415</VENDOR_NUM> <VENDOR_SITE_CODE>ISP-FAI-734-NZD</VENDOR_SITE_CODE> <ES_REQUISITION_LINE_ID>38946630</ES_REQUISITION_LINE_ID> <QUANTITY>1</QUANTITY> <UNIT_PRICE>36</UNIT_PRICE> <CURRENCY_CODE>NZD</CURRENCY_CODE> <RATE_TYPE/> <RATE_DATE/> <RATE/> <NEED_BY_DATE>01-MAY-19</NEED_BY_DATE> <ITEM_DESCRIPTION>4970438311 RTU-MEI CASH ACCEPTOR SC66 / SCL6607R</ITEM_DESCRIPTION> <UNIT_MEAS_LOOKUP_CODE>Each</UNIT_MEAS_LOOKUP_CODE> <SHIPMENT_NUM>1</SHIPMENT_NUM> <DISTRIBUTION_NUM>1</DISTRIBUTION_NUM> <PO_LINE_NUM>1</PO_LINE_NUM> <CHARGE_ACCOUNT>734-715000000-1525-8871-000-000000-00</CHARGE_ACCOUNT> <ES_REQUISITION_LINE_NUMBER>1</ES_REQUISITION_LINE_NUMBER> <ES_REQUISITION_NUMBER>132201</ES_REQUISITION_NUMBER> <CATEGORY>00000000</CATEGORY> <ES_INSTANCE>WORLD</ES_INSTANCE> </ESB_PO_PUB> </EVENT_DATA> </Data> <FromAgent> <Name>acme_PO_QAGENT</Name> <System>ER64R06.WORLD</System> </FromAgent> </WfEvent> </part> </parts> </message> ";
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final String expression = "/message/headers/header [@name=\"COUNTRY_CODE\"]=\"GB\" or /message/headers/header [@name=\"COUNTRY_CODE\"]=\"IE\" or /message/headers/header [@name=\"COUNTRY_CODE\"]=\"IN\" or /message/headers/header [@name=\"COUNTRY_CODE\"]=\"BE\" or /message/headers/header [@name=\"COUNTRY_CODE\"]=\"JP\"";
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// XPathFactory xpathFactory =
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// XPathFactory.newInstance(XPathConstants.DOM_OBJECT_MODEL);
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XPathFactory xpathFactory = new net.sf.saxon.xpath.XPathFactoryImpl();
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XPath xpath = xpathFactory.newXPath();
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// xpath.setNamespaceContext(nc);
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final XPathEvaluator xpathEvaluator_ = (XPathEvaluator) xpath;
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for (int i = 0; i < 20; i++) {
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new Thread() {
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public void run() {
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try {
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for (int c = 0; c < 10000; c++) {
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InputSource source = new InputSource(new StringReader(xml));
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XPathExpression xpathExpression = xpathEvaluator_.compile(expression);
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NodeInfo doc = xpathEvaluator_.getConfiguration().buildDocumentTree(new SAXSource(source))
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.getRootNode();
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Boolean result = (Boolean) xpathExpression.evaluate(doc, XPathConstants.BOOLEAN);
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// This seems to reduce/solve it but not sure why
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// Runtime.getRuntime().gc();
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// ran it with -Xmx1g -XX:+UseG1GC
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System.out.println(Runtime.getRuntime().totalMemory()/1024/1000);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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};
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}.run();
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}
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}
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}
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