thresholdmonitorthread.h

270的linux说明

/*

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//==============================================================================
// ThresholdMonitorThread.h 
//       Declaration of the class ThresholdMonitorThread
//==============================================================================
// This is a utility class that ThresholdManager uses to manage the thread that 
// periodically checks the thresholds on a property.
// It contains a thread-safe list of all of the thresholds. When the list contains items, a thread runs on
// the LPTHREAD_START_ROUTINE parameter provided to the constructor, and the 'this' ThresholdMonitorThread object
// is passed as the Parameter to the thread. The LPTHREAD_START_ROUTINE should REGULARLY call the IsThreadActive method
// because when there are not Thresholds in the list, the ThresholdMonitorThread object shuts down the thread, and 
// TERMNIATES it if it does not shut itself down within the period specified by ShutdownWaitLength().
//
// This class also provides a pointer to the ThresholdManager so that 
// ThresholdEvents can be fired to the subscribers.
//==============================================================================
#ifndef _THRESHOLDMONITORTHREAD_H
#define _THRESHOLDMONITORTHREAD_H

#include "inc/framework/win2linux.h"
#include "inc/framework/base_LoggerBase.h"

class ThresholdManager;

//==============================================================================
// ThresholdMonitorThread

class ThresholdMonitorThread : public LoggerBase
{
protected:
    ThresholdManager* m_pThresholdManager;     // ThresholdManager ownes the vector of thresholds
	HANDLE            m_hThreadHandle;
	bool              m_bThreadActive;
	long              m_lCheckInterval;
	long              m_lThreadWaitInterval;

public:
	ThresholdMonitorThread( CLog&             theLog, 
                            ThresholdManager* pManager  = NULL,
                            long              lInterval = 10000, // Default = 10 sec.
                            long              lWait     = 3000 );
	~ThresholdMonitorThread();


    void SetManager( ThresholdManager* pManager ) { m_pThresholdManager = pManager; }

    static DWORD MonitorProc( LPVOID pParam ); // The thread start routine
    bool                   Monitor();                    // The main processing method

    // Sets the interval in ms at which the loop calls the check routine. 
    long SetCheckInterval( long  lInterval );

    // Gets the interval in ms at which the loop calls the check routine. 
    long GetCheckInterval();

    // Allows the caller to determine how long the ThresholdMonitorThread object 
    // will wait before Terminating the monitor thread. 
    // More specifically, it is the time between IsThreadActive() returns true, 
    // and the time the thread is terminated and not allowed to clean up. 
    // This time is 3000 by default, but may need to be lengthened depending
	// on how many thresholds are being monitored and how long it takes to obtain 
    // the current value of a property.
	void  SetShutdownWaitLength ( long lMilliSeconds );
	long  GetShutdownWaitLength ();

	// The ThresholdManager will call this method to determine if it needs to
	// start or stop the thread.
	bool    IsThreadActive();

	HRESULT StartThread();
	HRESULT StopThread ();
};

//==============================================================================
#endif