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package com.sun.jts.trace;
import java.io.*;
import java.util.logging.*;
import javax.transaction.xa.XAException;
import com.sun.jts.CosTransactions.*;
import org.omg.CosTransactions.*;
/**
* This class is used to set trace properties and print trace statements. The print method does the printing.
* All the methods are unsynchronized. Since setting of properties doesn't happen simultaneously with print
* in current usage, this is fine. The tracing should be enabled/disabled by calling
* <code> Configuration.enableTrace()/disableTrace()</code>
* prior to any operation on TraceUtil.
* It uses TraceRecordFormatter for formatting the trace record.
*
* @author <a href="mailto:kannan.srinivasan@sun.com">Kannan Srinivasan</a>
* @version 1.0
*/
public class TraceUtil
{
private static int m_currentTraceLevel = TraceLevel.IAS_JTS_TRACE_TRIVIAL ;
private static char m_fieldDelimiter = ':';
private static String m_traceRecordTag = "iAS_JTS_Trace> ";
private static PrintWriter m_traceWriter = null ;
static
{
m_traceWriter = new PrintWriter(System.out);
}
/**
* Initialises the trace class with given output writer.
*
* @param traceWriter an <code>PrintWriter</code> value
*/
public static void init(PrintWriter traceWriter)
{
setTraceWriter(traceWriter);
}
/**
* Sets the output writer. By default the output writer is set to Stdout.
*
* @param traceWriter an <code>PrintWriter</code> value
*/
public static void setTraceWriter(PrintWriter traceWriter)
{
m_traceWriter = traceWriter;
}
/**
* Gets the current output writer.
*
* @return an <code>PrintWriter</code> value
*/
public static PrintWriter getTraceWriter()
{
return m_traceWriter;
}
/**
* Gets the current trace level. Returns an integer as per the TraceLevel constants.
*
* @return an <code>int</code> value
*/
public static int getCurrentTraceLevel()
{
return m_currentTraceLevel;
}
/**
* Sets the current trace level. The argument is tested for its validity and trace level is set.
* Else an exception is raised.
*
* @param traceLevel an <code>int</code> value
* @exception InvalidTraceLevelException if an error occurs
*/
public static void setCurrentTraceLevel(int traceLevel) throws InvalidTraceLevelException
{
if(Configuration.isTraceEnabled())
{
int i;
boolean traceLevelSet = false;
for(i = 0; i <= TraceLevel.IAS_JTS_MAX_TRACE_LEVEL; i++)
{
if(traceLevel == i)
{
m_currentTraceLevel = traceLevel;
traceLevelSet = true;
break;
}
}
if(!traceLevelSet)
throw new InvalidTraceLevelException();
}
}
/**
* This method formats and writes the trace record to output writer. The method is called
* with a tracelevel, which is checked with current trace level and if found equal or higher,
* the print is carried out. This method takes an PrintWriter also, which is used to write the
* output. This given outputWriter would override the set outputWriter. The origin object is printed
* using its toString() method.
* @param traceLevel an <code>int</code> value
* @param outWriter an <code>PrintWriter</code> value
* @param tid an <code>Object</code> value
* @param origin an <code>Object</code> value
* @param msg a <code>String</code> value
*/
public static void print(int traceLevel, PrintWriter outWriter, Object tid, Object origin, String msg)
{
if( traceLevel <= m_currentTraceLevel )
{
String traceRecord = TraceRecordFormatter.createTraceRecord(tid, origin, msg);
outWriter.println(traceRecord);
}
}
/**
* This method formats and writes the trace record to current output writer. The method is
* called with a tracelevel, which is checked with current trace level and if found equal
* or higher, the print is carried out. This method doesn't take a otid and tries to recover
* it from current obejct asscociated with this thread
* @param traceLevel an <code>int</code> value
* @param origin an <code>Object</code> value
* @param msg a <code>String</code> value
*/
public static void print(int traceLevel, Object origin, String msg)
{
try{
print(traceLevel,
((com.sun.jts.CosTransactions.TopCoordinator)
com.sun.jts.CosTransactions.CurrentTransaction.getCurrent().get_localCoordinator()).get_transaction_name(),
origin,
msg
);
}catch(Exception e){
print(traceLevel,null,origin,msg);
}
}
/**
* This method formats and writes the trace record to current output writer. The method is called
* with a tracelevel, which is checked with current trace level and if found equal or higher,
* the print is carried out. This uses the currently set output writer to write the trace output.
* @param traceLevel an <code>int</code> value
* @param tid an <code>Object</code> value
* @param origin an <code>Object</code> value
* @param msg a <code>String</code> value
*/
public static void print(int traceLevel, Object tid, Object origin, String msg)
{
print(traceLevel,m_traceWriter,tid,origin,msg);
}
/**
* Gets the current field delimiter used in formatting trace record. The default is ':'.
*
* @return a <code>char</code> value
*/
public static char getFieldDelimiter()
{
return m_fieldDelimiter;
}
/**
* Sets the current field delimiter.
*
* @param delimiter a <code>char</code> value
*/
public static void setFieldDelimiter(char delimiter)
{
m_fieldDelimiter = delimiter;
}
/**
* Gets the current trace record tag used in formatting of trace record. The default is
* 'iAS_JTS_Trace> '.
*
* @return a <code>String</code> value
*/
public static String getTraceRecordTag()
{
return m_traceRecordTag;
}
/**
* Sets the trace record tag.
*
* @param traceRecordTag a <code>String</code> value
*/
public static void setTraceRecordTag(String traceRecordTag)
{
m_traceRecordTag = traceRecordTag;
}
/**
* Returns details about Oracle XAException if available.
* Returns an default message if it is not Oracle XAException
*
* @param exception an <code>XAException</code> to get info from
* @param logger the <code>Logger</code> to use to report errors extracting the data
* @return a <code>String</code> value
*/
public static String getXAExceptionInfo(XAException exception, Logger logger) {
Class<? extends XAException> aClass = exception.getClass();
if (aClass.getName().indexOf("OracleXAException") < 0) {
return exception.getMessage();
}
StringBuffer msg = new StringBuffer();
try {
String oracleError = "" + invokeMethod(exception, aClass, "getOracleError", logger);
String oracleSQLError = "" + invokeMethod(exception, aClass, "getOracleSQLError", logger);
String xaError = "" + invokeMethod(exception, aClass, "getXAError", logger);
msg.append("\n XAException = ").append(exception.getMessage()).
append("\n OracleError = ").append(oracleError).
append("\n OracleSQLError = ").append(oracleSQLError).
append("\n XAError = ").append(xaError);
} catch (Exception e) {
logger.log(Level.WARNING, "getXAExceptionInfo failed with exception:", e);
}
return msg.toString();
}
/**
* Invokes specified no-arg method on the specified instance.
*
* @param instance the instance to invoke the method on
* @param clz the <code>Class</code> that the method is defined on
* @param method the method name
* @param logger the <code>Logger</code> to use to report errors extracting the data
* @return result of the method invocation
*/
private static Object invokeMethod(Object instance, Class clz, String mname, Logger logger) {
try {
java.lang.reflect.Method m = clz.getMethod(mname, null);
return m.invoke(instance, null);
} catch (Exception e) {
logger.log(Level.FINE, "", e);
}
return null;
}
}