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package jpos.util.tracing;

///////////////////////////////////////////////////////////////////////////////
//
// This software is provided "AS IS".  The JavaPOS working group (including
// each of the Corporate members, contributors and individuals)  MAKES NO
// REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE,
// EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED 
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
// NON-INFRINGEMENT. The JavaPOS working group shall not be liable for
// any damages suffered as a result of using, modifying or distributing this
// software or its derivatives. Permission to use, copy, modify, and distribute
// the software and its documentation for any purpose is hereby granted. 
//
// The JavaPOS Config/Loader (aka JCL) is now under the CPL license, which 
// is an OSS Apache-like license.  The complete license is located at:
//    http://www.ibm.com/developerworks/library/os-cpl.html
//
///////////////////////////////////////////////////////////////////////////////

import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;

import jpos.util.*;

/**
 * This is a singleton factory used to create Tracer objects and access the
 * global tracer.  This implementation has the following semantics:
 * 
    *
  1. Its a Singleton class but can be subclassed if necessary
  2. *
  3. It caches the default no-named Tracer. This is the global Tracer
  4. *
  5. * It caches the Tracer objects according to name and any access for the * same named Tracer will return the same Tracer object *
  6. *
* @see com.ibm.jutil.tracing.Tracer#getInstance * @author E. Michael Maximilien * @since 2.1.0 */ public class TracerFactory extends Object { //------------------------------------------------------------------------- // Ctor // /** Make ctor protected to avoid construction (this is a Singleton class) */ protected TracerFactory() {} //------------------------------------------------------------------------- // Public class methods // /** @return the sole instance of this class (creating it if necessary) */ public static TracerFactory getInstance() { if( instance == null ) { instance = new TracerFactory(); instance.init(); } return instance; } //------------------------------------------------------------------------- // Public methods // /** * Sets the File that all subsequently created Tracer objects will print to * if these Tracer objects are turned on. Successfully calling this method * overrides the current setting for TracerOutput to files * @throws java.io.IOException if a PrintStream could not be created from File */ public void setOutputFile( File file ) throws IOException { // } /** * @return the global no named Tracer object -- creates it if necessary * Its state is determined by the jutil.properties value */ public Tracer createGlobalTracer() { return globalTracer; } /** * @return the global no named Tracer object -- creates it if necessary * Its state is determined by the jutil.properties value * @param b the boolean parameter for the initial state of the tracer */ public Tracer createGlobalTracer( boolean b ) { globalTracer.setOn( b ); return globalTracer; } /** * @return creates (if necessary) and return the Tracer with named specified * Its state is determined by the jutil.properties value * @param name the Tracer name */ public Tracer createTracer( String name ) { if( tracerMap.containsKey( name ) ) return (Tracer)tracerMap.get( name ); Tracer tracer = new Tracer( name ); if( namedTracerState.containsKey( name ) ) tracer.setOn( ( (Boolean)namedTracerState.get( name ) ).booleanValue() ); else tracer.setOn( false ); if( turnOnAllNamedTracers ) tracer.setOn( true ); tracerMap.put( name, tracer ); return tracer; } /** * @return creates (if necessary) and return the Tracer with named specified * Its state is determined by the jutil.properties value * @param name the Tracer name * @param b the boolean parameter for the initial state of the tracer */ public Tracer createTracer( String name, boolean b ) { Tracer tracer = createTracer( name ); tracer.setOn( b ); return tracer; } //------------------------------------------------------------------------- // Protected methods // /** * Finalizes this Tracer by closing the TracerOutput. This is useful * if the TracerOutput is printing to a file. This method would then * close that file * @throws java.lang.Thowable any exception occuring while finalizing */ protected void finalize() { if( printStream != null ) printStream.close(); } //------------------------------------------------------------------------- // Private methods // /** * @return true if the propertyValue passed is valid and is equals (ignoring * case) to TRUE or YES * @param propValue the property value to check */ private boolean isPropertyTrue( String propValue ) { if( propValue == null ) return false; if( propValue. equalsIgnoreCase( JposProperties.TRACING_ON_PROP_VALUE ) || propValue. equalsIgnoreCase( JposProperties.TRACING_TRUE_PROP_VALUE ) ) return true; return false; } /** Intialize the current instance using the DefaultProperties class */ private void init() { JposProperties props = new DefaultProperties(); props.loadJposProperties(); initGlobalTracer( props ); initTurnedOnTracers( props ); initNamedTracers( props ); initTracerOutput(); } /** * Initializes the state of the globalTracer -not named * @param props the JposProperties instance */ private void initGlobalTracer( JposProperties props ) { if( !props.isPropertyDefined( TRACING_PROP_NAME ) ) globalTracer.setOn( false ); else { String tracingPropValue = props.getPropertyString( TRACING_PROP_NAME ); if( isPropertyTrue( tracingPropValue ) ) globalTracer.setOn( true ); } } /** * Sets to on all named tracers listed in the value of the... * TurnOnNamedTracers property * @param props the JposProperties instance */ private void initTurnedOnTracers( JposProperties props ) { if( props.isPropertyDefined( TURN_ON_ALL_NAMED_TRACERS_PROP_NAME ) ) { String turnOnAllNamedTracersValue = props. getPropertyString( TURN_ON_ALL_NAMED_TRACERS_PROP_NAME ); if( isPropertyTrue( turnOnAllNamedTracersValue ) ) turnOnAllNamedTracers = true; else turnOnAllNamedTracers = false; } else if( props.isPropertyDefined( TURN_ON_NAMED_TRACERS_PROP_NAME ) ) { List turnOnNamedTracersList = props.getStringListProperty( TURN_ON_NAMED_TRACERS_PROP_NAME ); for( int i = 0; i < turnOnNamedTracersList.size(); ++i ) { String tracerName = turnOnNamedTracersList.get( i ).toString(); namedTracerState.put( tracerName, Boolean.TRUE ); } } } /** * Initializes the state of all named Tracer objects * @param props the JposProperties instance */ private void initNamedTracers( JposProperties props ) { Enumeration propNames = props.getPropertyNames(); while( propNames.hasMoreElements() ) { String propName = (String)propNames.nextElement(); if( propName.startsWith( TRACER_PROP_NAME ) ) { String name = propName. substring( ( TRACER_PROP_NAME + "." ).length(), propName.length() ); if( props.isPropertyDefined( propName ) ) { String propValue = (String)props. getPropertyString( propName ); if( propValue.equalsIgnoreCase( JposProperties. TRACING_ON_PROP_VALUE ) || propValue.equalsIgnoreCase( JposProperties. TRACING_TRUE_PROP_VALUE ) ) namedTracerState.put( name, Boolean.TRUE ); else namedTracerState.put( name, Boolean.FALSE ); } } } } /** * Initializes whether TracerOutput will be to a file or System.err and * if to a file its location and name. By default TracerOutput is to * System.err for all tracers that are turned on */ private void initTracerOutput() { // } //------------------------------------------------------------------------- // Private instance variables // private HashMap tracerMap = new HashMap(); private HashMap namedTracerState = new HashMap(); private Tracer globalTracer = Tracer.getInstance(); private PrintStream printStream = null; private boolean turnOnAllNamedTracers = false; //------------------------------------------------------------------------- // Private class variables // private static TracerFactory instance = null; //------------------------------------------------------------------------- // Class constants // public static final String TRACING_PROP_NAME = "jpos.tracing"; public static final String TRACER_PROP_NAME = "jpos.util.tracing.Tracer"; public static final String TURN_ON_NAMED_TRACERS_PROP_NAME = "jpos.util.tracing.TurnOnNamedTracers"; public static final String TURN_ON_ALL_NAMED_TRACERS_PROP_NAME = "jpos.util.tracing.TurnOnAllNamedTracers"; public static final String TRACER_OUTPUT_TO_FILE_PROP_NAME = "jpos.util.tracing.TracerOutputToFile"; public static final String TRACER_OUTPUT_FILE_NAME_PROP_NAME = "jpos.util.tracing.TracerOutputFileName"; public static final String TRACER_OUTPUT_FILE_LOCATION = "jpos.util.tracing.TracerOutputFileLocation"; public static final String USER_HOME_LOCATION_VALUE = ""; }




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