tracer.h

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

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#ifndef Pegasus_Tracer_h
#define Pegasus_Tracer_h

#include <stdarg.h>
#include <Pegasus/Common/String.h>
#include <Pegasus/Common/System.h>
#include <Pegasus/Common/Logger.h>
#include <Pegasus/Common/InternalException.h>
#include <Pegasus/Common/TraceComponents.h>
#include <Pegasus/Common/TraceFileHandler.h>
#include <Pegasus/Common/Linkage.h>
#include <Pegasus/Common/AutoPtr.h>

PEGASUS_NAMESPACE_BEGIN

/** Token used for tracing functions.
*/
struct TracerToken
{
    Uint32 component;
    const char* method;
};

/** Tracer implements tracing of messages to a defined file
 */
class PEGASUS_COMMON_LINKAGE Tracer
{
public:

    /** Levels of trace
        Trace messages are written to the trace file only if they are at or
        above a given trace level
        LEVEL1 - Function Entry/Exit
        LEVEL2 - Basic flow trace messages, low data detail
        LEVEL3 - Inter-function logic flow, medium data detail
        LEVEL4 - High data detail
     */
    static const Uint32 LEVEL1;
    static const Uint32 LEVEL2;
    static const Uint32 LEVEL3;
    static const Uint32 LEVEL4;

    /** Traces the specified number of bytes in a given buffer
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param data            buffer to be traced
        @param size            number of bytes to be traced
     */
    static void traceBuffer(
        const Uint32 traceComponent,
        const Uint32 level,
        const char*  data,
        const Uint32 size);

    /** Traces the specified number of bytes in a given buffer
        Overloaded to include the filename and the line number
        of trace origin.
        @param fileName        filename of the trace originator
        @param lineNum         line number of the trace originator
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param data            buffer to be traced
        @param size            size of the buffer
     */
    static void traceBuffer(
        const char*  fileName,
        const Uint32 lineNum,
        const Uint32 traceComponent,
        const Uint32 level,
        const char*  data,
        const Uint32 size);

    /** Traces the given message
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param *fmt            printf style format string
        @param ...             variable argument list
     */
    static void trace(
        const Uint32 traceComponent,
        const Uint32 level,
        const char *fmt,
        ...);

    /** Traces the given message. Overloaded to include the filename and
        the line number of trace origin.
        @param fileName        filename of the trace originator
        @param lineNum         line number of the trace originator
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param *fmt            printf style format string
        @param ...             variable argument list
     */
    static void trace(
        const char* fileName,
        const Uint32 lineNum,
        const Uint32 traceComponent,
        const Uint32 level,
        const char* fmt,
        ...);

    /** Traces the given string.  Overloaded to include the filename
        and line number of trace origin.
        @param fileName        filename of the trace originator
        @param lineNum         line number of the trace originator
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param string          the string to be traced
     */
    static void trace(
        const char* fileName,
        const Uint32 lineNum,
        const Uint32 traceComponent,
        const Uint32 level,
        const String& string);

    /** Traces the given string.
        @param fileName        filename of the trace originator
        @param lineNum         line number of the trace originator
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param string          the string to be traced
     */
    static void trace(
        const Uint32 traceComponent,
        const Uint32 level,
        const String& string);

    /** Traces the message in the given CIMException object.  The message
        written to the trace file will include the source filename and
        line number of the CIMException originator.
        @param traceComponent  component being traced
        @param level           trace level of the trace message
        @param CIMException    the CIMException to be traced.
     */
    static void traceCIMException(
        const Uint32 traceComponent,
        const Uint32 level,
        const CIMException& cimException);

    /** Set the trace file to the given file
        @param  traceFile  full path of the trace file
        @return 0          if the filepath is valid
                1          if the traceFile is an empty string or
                           if an error occurs while opening the file
                           in append mode
    */
    static Uint32 setTraceFile(const char* traceFile);

    /** Set the trace level to the given level
        @param  level  trace level to be set
        @return 0      if trace level is valid
                1      if trace level is invalid
    */
    static Uint32 setTraceLevel(const Uint32 level);

    /** Set components to be traced
        @param traceComponents list of components to be traced,
               components should be separated by ','
    */
    static void setTraceComponents(
       const String& traceComponents);

    /** Traces method entry.
        @param token           TracerToken
        @param traceComponent  component being traced
        @param methodName      method being traced
     */
    static void traceEnter(
        TracerToken& token,
        Uint32 component,
        const char* method);

    /** Traces method exit.
        @param token TracerToken containing component and method
    */
    static void traceExit(
        TracerToken& token);

    /** Traces method entry.
        @param token           TracerToken
        @param fileName        filename of the trace originator
        @param lineNum         line number of the trace originator
        @param traceComponent  component being traced
        @param methodName      method being traced
     */
    static void traceEnter(
        TracerToken& token,
        const char* file,
        size_t line,
        Uint32 component,
        const char* method);

    /** Traces method exit.
        @param token    TracerToken containing component and method
        @param fileName filename of the trace originator
        @param lineNum  line number of the trace originator
     */
    static void traceExit(
        TracerToken& token,
        const char* file,
        size_t line);

    /** Validates the File Path for the trace File
        @param  filePath full path of the file
        @return 1        if the file path is valid
                0        if the file path is invalid
     */
    static Boolean isValidFileName(const char* filePath);

    /** Validates the trace components
        @param  traceComponents   comma separated list of trace components
        @return 1        if the components are valid
                0        if one or more components are invalid
     */
    static Boolean isValidComponents(const String& traceComponents);

    /** Validates the trace components
        @param  traceComponents   comma separated list of trace components
        @param  invalidComponents comma separated list of invalid components
        @return 1        if the components are valid
                0        if one or more components are invalid
     */
    static Boolean isValidComponents(
        const String& traceComponents,
        String& invalidComponents);

    /** Specify the name of the module being traced.  If non-empty, this
        value is used as an extension to the name of the trace file.
        @param  moduleName Name of the module being traced.
     */
    static void setModuleName(const String& moduleName);

    /**
    */
    static Boolean isTraceOn() { return _traceOn; }

private:

    /** A static single indicator if tracing is turned on allowing to
        determine the state of trace quickly without many instructions.
        Used to wrap the public static trace interface methods to avoid
        obsolete calls when tracing is turned off.
     */
    static Boolean _traceOn;

    static const char   _COMPONENT_SEPARATOR;
    static const Uint32 _NUM_COMPONENTS;
    static const Uint32 _STRLEN_MAX_UNSIGNED_INT;
    static const Uint32 _STRLEN_MAX_PID_TID;
    static const Boolean _SUCCESS;
    static const Boolean _FAILURE;
    AutoArrayPtr<Boolean> _traceComponentMask;
    Uint32              _traceLevelMask;
    AutoPtr<TraceFileHandler> _traceHandler;
    String              _moduleName;
    static Tracer*      _tracerInstance;

    // Message Strings for function Entry and Exit
    static const char _METHOD_ENTER_MSG[];
    static const char _METHOD_EXIT_MSG[];

    // Message Strings for Logger
    static const char _LOG_MSG[];

    // Checks if trace is enabled for the given component and trace level
    // @param    traceComponent  component being traced
    // @param    level      level of the trace message