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/*-------------------------------------------------------------------------
*
* Copyright (c) 2005-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgjdbc/org/postgresql/core/Logger.java,v 1.3 2008/01/08 06:56:27 jurka Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.core;
import java.text.SimpleDateFormat;
import java.text.FieldPosition;
import java.sql.DriverManager;
import java.io.PrintWriter;
import java.util.Date;
import org.postgresql.Driver;
/**
* Poor man's logging infrastructure. This just deals with maintaining a per-
* connection ID and log level, and timestamping output.
*/
public final class Logger {
// For brevity we only log the time, not date or timezone (the main reason
// for the timestamp is to see delays etc. between log lines, not to pin
// down an instant in time)
private final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss.SSS ");
private final FieldPosition dummyPosition = new FieldPosition(0);
private final StringBuffer buffer = new StringBuffer();
private final String connectionIDString;
private int level = 0;
public Logger() {
connectionIDString = "(driver) ";
}
public Logger(int connectionID) {
connectionIDString = "(" + connectionID + ") ";
}
public void setLogLevel(int level) {
this.level = level;
}
public int getLogLevel() {
return level;
}
public boolean logDebug() {
return level >= Driver.DEBUG;
}
public boolean logInfo() {
return level >= Driver.INFO;
}
public void debug(String str) {
debug(str, null);
}
public void debug(String str, Throwable t) {
if (logDebug())
log(str, t);
}
public void info(String str) {
info(str, null);
}
public void info(String str, Throwable t) {
if (logInfo())
log(str, t);
}
public void log(String str, Throwable t) {
PrintWriter writer = DriverManager.getLogWriter();
if (writer == null)
return;
synchronized (this) {
buffer.setLength(0);
dateFormat.format(new Date(), buffer, dummyPosition);
buffer.append(connectionIDString);
buffer.append(str);
// synchronize to ensure that the exception (if any) does
// not get split up from the corresponding log message
synchronized (writer) {
writer.println(buffer.toString());
if (t != null)
t.printStackTrace(writer);
}
}
}
}
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