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package com.sun.xml.messaging.saaj.util;
import org.apache.xerces.jaxp.SAXParserFactoryImpl;
import org.apache.xerces.util.SymbolTable;
import org.xml.sax.SAXException;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
/**
* Pool of SAXParser objects
*/
public class ParserPool {
private final BlockingQueue queue;
private SAXParserFactory factory;
private int capacity;
public ParserPool(int capacity) {
this.capacity = capacity;
queue = new ArrayBlockingQueue(capacity);
//factory = SAXParserFactory.newInstance();
factory = new SAXParserFactoryImpl();
factory.setNamespaceAware(true);
for (int i=0; i < capacity; i++) {
try {
queue.put(factory.newSAXParser());
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
throw new RuntimeException(ex);
} catch (ParserConfigurationException ex) {
throw new RuntimeException(ex);
} catch (SAXException ex) {
throw new RuntimeException(ex);
}
}
}
public SAXParser get() throws ParserConfigurationException,
SAXException {
try {
return (SAXParser) queue.take();
} catch (InterruptedException ex) {
throw new SAXException(ex);
}
}
public void put(SAXParser parser) {
queue.offer(parser);
}
public void returnParser(SAXParser saxParser) {
saxParser.reset();
resetSaxParser(saxParser);
put(saxParser);
}
/**
* SAAJ Issue 46 :https://saaj.dev.java.net/issues/show_bug.cgi?id=46
* Xerces does not provide a way to reset the SymbolTable
* So we are trying to reset it using the proprietary code below.
* Temporary Until the bug : https://jaxp.dev.java.net/issues/show_bug.cgi?id=59
* is fixed.
* @param parser the parser from the pool whose Symbol Table needs to be reset.
*/
private void resetSaxParser(SAXParser parser) {
try {
//Object obj = parser.getProperty("http://apache.org/xml/properties/internal/symbol-table");
SymbolTable table = new SymbolTable();
parser.setProperty("http://apache.org/xml/properties/internal/symbol-table", table);
//obj = parser.getProperty("http://apache.org/xml/properties/internal/symbol-table");
} catch (SAXNotRecognizedException ex) {
//nothing to do
} catch (SAXNotSupportedException ex) {
//nothing to do
}
}
}