Quadcap Embeddable Server

com/quadcap/util/Debug.java

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package com.quadcap.util;

/* Copyright 1997 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

import java.util.Date;
import java.util.Hashtable;

import java.sql.SQLException;

import java.text.SimpleDateFormat;

import com.quadcap.sql.file.DatafileException;

/**
 * Common functions for debug and log output.
 *
 * @author Stan Bailes
 */
public class Debug {
    static public PrintStream           debugStream     = System.out;
    static public int                   printLevel      = 0;

    private static String               debugFileName   = null;
    private static FileOutputStream     debugFileStream = null;

    static Hashtable                    debugMap        = new Hashtable();
    static NullSecurityManager          sm              = null;

    static public final int             debugOff        = 0;
    static public final int             debugSome       = 1;
    static public final int             debugAll        = 3;
    static public final int             debugPackage    = 4;

    static public int                   debugMode       = debugAll;

    static public final int             debugNoTime     = 0;
    static public final int             debugElap       = 1;
    static public final int             debugInterval   = 2;
    static public final int             debugShowTime   = 3;

    static public int                   debugTime       = debugShowTime;

    static public long                  start           = new Date().getTime();
    static public long                  last            = start;

    static SimpleDateFormat             sdf             =
    new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");


    /*{com.quadcap.util.Config-vars.xml-0}
     *
     * <config>
     */

    /*{com.quadcap.util.Config-vars.xml-999999}
     *
     * </config>
     */

    /*{com.quadcap.util.Config-vars.xml-10}
     *
     * <config-var>
     *   <config-name>debug.file</config-name>
     *   <config-dflt>stderr</config-dflt>
     *   <config-desc>Specify the name of the debug log file.  The default
     *         value, <code>stderr</code>, causes debug information to
     *         be written to <code>System.err</code>.</config-desc>
     * </config-var>
     *
     * <config-var>
     *   <config-name>debug.level</config-name>
     *   <config-dflt>0</config-dflt>
     *   <config-desc>Specify the level of debugging output.  Level zero,
     *       the lowest level, essentially turns debug output off (though
     *       errors/exceptions will still be reported.)  Increasing levels
     *       will result in more debug output.  The maximum debug level is
     *       five (5).</config-desc>
     * </config-var>
     */
    static {
        //System.setSecurityManager(sm = new NullSecurityManager());
        try {
            ConfigString file = ConfigString.find("debug.file", "stderr");
            if (file != null) {
                setLogFile(file.toString());
            }
            ConfigNumber level = ConfigNumber.find("debug.level", "0");
            if (level != null) {
                printLevel = level.intValue();
            }
        } catch (IOException e) {
            Debug.print(e);
        }
    }

    static public Class[] getClassContext() {
        return sm.pubGetClassContext();
    }

    static public void setDebugLevel(String name, String level) {
        debugMap.put(name, level);
    }
    
    static public void print(Throwable e) {
        if (e == null) return;
        if (!(e instanceof SQLException)) {
            Debug.println(0, 2, e.getClass().getName());
        }
        debugStream.print(hdr());
        e.printStackTrace(debugStream);
        if (e instanceof SQLException) {
            printSQLException((SQLException)e);
        } else if (e.getCause() != null) {
            Debug.println("Cause of this exception:");
            print(e.getCause());
        }
    }

    static void printSQLException(SQLException e) {
        StringBuffer sb = new StringBuffer(e.toString());
        int idx;
        while ((idx = sb.toString().indexOf("Exception:")) >= 0) {
            sb.setCharAt(idx + 9, ',');
        }
        Debug.println(0, 3, sb.toString() + ", SQLState = " + e.getSQLState() +
                      ", errorCode = " + e.getErrorCode());
        SQLException next = e.getNextException();
        if (next != null) {
            Debug.println("Next SQL Exception:");
            printSQLException(next);
        } else if (e.getCause() != null) {
            Debug.println("Cause of this exception:");
            print(e);
        }
    }

    static public void println(String s) {
        println(0, 1, s);
    }

    static public String getInterval() {
        String ret = null;
        Date d = new Date();
        long now = d.getTime();

        switch (debugTime) {
        case debugInterval:
            ret = "" + (now - last);
            last = now;
            break;
        case debugElap:
            ret = "" + (now - start);
            break;
        case debugShowTime:
            ret = "" + sdf.format(d);
            break;
        }
        return ret;
    }

    /**
     * Specify the file to be used for debug/log output.  If there is
     * already a debug file open with a different name, it is closed first,
     * and if the name specified is <code>"stdout"</code>, then debug
     * output is directed to <code>System.out</code>.
     *
     * @param name the name of the debug log file.
     * @exception IOException may be thrown.
     */
    static public void setLogFile(String name) throws IOException {
        if (name.equals("stdout")) {
            if (debugFileStream != null) {
                debugFileStream.close();
                debugFileStream = null;
            }
            debugStream = System.out;
        } else if (name.equals("stderr")) {
            if (debugFileStream != null) {
                debugFileStream.close();
                debugFileStream = null;
            }
            debugStream = System.err;
        } else {
            boolean append = name.startsWith("append:");
            if (append) name = name.substring(7).trim();
            name = new File(name).getAbsolutePath();
            if (debugFileName == null || !name.equals(debugFileName)) {
                debugFileName = name;
                if (debugFileStream != null) {
                    debugFileStream.close();
                    debugFileStream = null;
                }
                debugFileStream = new FileOutputStream(name, append);
                debugStream = new PrintStream(debugFileStream);
                println("---- [Debug started]");
            }
        }
    }

    /**
     * Specify the 'level' for debugging output.  Only debug statements
     * satisfying <code>level &lt;= printLevel</code> result in output.
     *
     * @param printLevel the new debug output level.
     */
    static public void setLogLevel(int printLevel) {
        if (printLevel != Debug.printLevel) {
            Debug.println(0, "Changing log level from " + Debug.printLevel +
                          " to " + printLevel);
            Debug.printLevel = printLevel;
        }
    }

    /**
     * Specify the debug mode using the convenient string representation
     *
     * @param mode the debug mode.
     */
    static public void setDebugMode(String mode) {
        if (mode.equals("off")) {
            Debug.debugMode = Debug.debugOff;
        } else if (mode.equals("some")) {
            Debug.debugMode = Debug.debugSome;
        } else if (mode.equals("all")) {
            Debug.debugMode = Debug.debugAll;
        } else if (mode.equals("package")) {
            Debug.debugMode = Debug.debugPackage;
        }
    }

    /**
     * Debug output at level <code>level</code>.
     */
    static synchronized public void println(int level, String s) {
        println(level, 1, s);
    }

    static String hdr() {
        StringBuffer sb = new StringBuffer();
        if (debugTime != debugNoTime) {
            sb.append(getInterval());
            sb.append(": ");
        }
        sb.append("[");
        sb.append(Thread.currentThread().getName());
        sb.append("] ");
        return sb.toString();
    }
    
    /**
     * Debug output at level <code>level</code>.
     */
    static synchronized public void println(int level, int depth, String s) {
        if (level > printLevel) return;
        debugStream.print(hdr());
        if (sm != null) {
            String className = debugSite(level, depth+1);
            debugStream.print(className + ": ");
        }
        debugStream.println(s);
    }

    static String debugSite(int level, int depth) {
        if (debugMode == debugOff || level > printLevel) return null;
        boolean print = true;
        Class[] classes = sm.pubGetClassContext();

        String className = "";
        String packageName = "";
        if (classes.length > 2 + depth) {
            Class caller = classes[2 + depth];
            className = caller.getName();
            int pos = className.lastIndexOf('.');
            if (pos >= 0) {
                packageName = className.substring(0, pos);
                className = className.substring(pos+1);
            }
        }

        String debugVal;
        
        switch (debugMode) {
        case debugSome:
            debugVal = (String)debugMap.get(className);
            if (debugVal != null && level <= Integer.parseInt(debugVal)) {
                print = debugMode == debugSome;
            }
            break;
        case debugPackage:
            debugVal = (String)debugMap.get(packageName);
            if (debugVal != null && level <= Integer.parseInt(debugVal)) {
                print = debugMode == debugPackage;
            }
            break;          
        }
    
        if (print) return className;
        return null;
    }   

}