TMidasOnline Class Reference

MIDAS online connection, including access to online ODB. More...

#include <TMidasOnline.h>

Inheritance diagram for TMidasOnline:

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Collaboration diagram for TMidasOnline:

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List of all members.

Public Types
typedef void(*	TransitionHandler )(int transition, int run_number, int trans_time)
	User handler for run state transition events.
typedef void(*	EventHandler )(const void header, const void data, int length)
	User handler for data events.
Public Member Functions
int	connect (const char hostname, const char exptname, const char *progname)
	Connect to MIDAS experiment.
int	disconnect ()
	Disconnect from MIDAS.
bool	poll (int mdelay)
	Check for MIDAS events (run transitions, data requests).
void	registerTransitions ()
	Ask MIDAS to tell us about run transitions.
void	setTransitionHandlers (TransitionHandler start, TransitionHandler stop, TransitionHandler pause, TransitionHandler resume)
	Specify user handlers for run transitions.
bool	checkTransitions ()
	Check for pending transitions, call user handlers. Returns "true" if there were transitions.
void	setEventHandler (EventHandler handler)
	Specify user handler for data events.
int	eventRequest (const char *bufferName, int eventId, int triggerMask, int samplingType, bool poll=false)
	Request data for delivery via callback (setEventHandler) or by polling (via receiveEvent).
void	deleteEventRequest (int requestId)
	Delete data request.
int	receiveEvent (int requestId, void *pevent, int size, bool async)
	Receive event by polling.
int	getBufferLevel ()
	Get buffer level (ie the number of bytes in buffer).
int	getBufferSize ()
	Get buffer size.
int	odbReadArraySize (const char *name)
	Read size of an array.
int	odbReadAny (const char name, int index, int tid, void buf, int bufsize=0)
	Read value of arbitrary type.
int	odbReadInt (const char *name, int index=0, int defaultValue=0)
	Read an integer value, midas type TID_INT.
uint32_t	odbReadUint32 (const char *name, int index=0, uint32_t defaultValue=0)
	Read an unsigned 32-bit integer value, midas type TID_DWORD.
double	odbReadDouble (const char *name, int index=0, double defaultValue=0)
	Read an 64-bit floating point value, midas type TID_DOUBLET.
float	odbReadFloat (const char *name, int index=0, float defaultValue=0)
	Read an 32-bit floating point value, midas type TID_FLOAT.
bool	odbReadBool (const char *name, int index=0, bool defaultValue=false)
	Read a boolean value, midas type TID_BOOL.
const char *	odbReadString (const char name, int index=0, const char defaultValue=NULL)
	Read a string value, midas type TID_STRING.
Static Public Member Functions
static TMidasOnline *	instance ()
Public Attributes
std::string	fHostname
	hostname where the mserver is running, blank if using shared memory
std::string	fExptname
	experiment name, blank if only one experiment defined in exptab
int	fDB
	ODB handle.
TransitionHandler	fStartHandler
TransitionHandler	fStopHandler
TransitionHandler	fPauseHandler
TransitionHandler	fResumeHandler
EventRequest *	fEventRequests
EventHandler	fEventHandler
Private Member Functions
	TMidasOnline ()
	default constructor is private for singleton classes
virtual	~TMidasOnline ()
	destructor is private for singleton classes
Static Private Attributes
static TMidasOnline *	gfMidas = NULL

Detailed Description

MIDAS online connection, including access to online ODB.

Definition at line 36 of file TMidasOnline.h.

Member Typedef Documentation

typedef void(* TMidasOnline::EventHandler)(const void *header, const void *data, int length)

User handler for data events.

Definition at line 44 of file TMidasOnline.h.

typedef void(* TMidasOnline::TransitionHandler)(int transition, int run_number, int trans_time)

User handler for run state transition events.

Definition at line 41 of file TMidasOnline.h.

Constructor & Destructor Documentation

TMidasOnline::TMidasOnline ( ) [private]

default constructor is private for singleton classes

Definition at line 22 of file TMidasOnline.cxx.

References fDB, fEventHandler, fEventRequests, fPauseHandler, fResumeHandler, fStartHandler, and fStopHandler.

Referenced by instance().

00023 {
00024   fDB = 0;
00025   fStartHandler  = 0;
00026   fStopHandler   = 0;
00027   fPauseHandler  = 0;
00028   fResumeHandler = 0;
00029   fEventRequests = 0;
00030   fEventHandler  = 0;
00031 }

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TMidasOnline::~TMidasOnline ( ) [private, virtual]

destructor is private for singleton classes

Definition at line 33 of file TMidasOnline.cxx.

References disconnect().

00034 {
00035   disconnect();
00036 }

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Member Function Documentation

bool TMidasOnline::checkTransitions ( )

Check for pending transitions, call user handlers. Returns "true" if there were transitions.

Definition at line 120 of file TMidasOnline.cxx.

References fPauseHandler, fResumeHandler, fStartHandler, and fStopHandler.

Referenced by poll().

00121 {
00122   int transition, run_number, trans_time;
00123   
00124   int status = cm_query_transition(&transition, &run_number, &trans_time);
00125   if (status != CM_SUCCESS)
00126     return false;
00127   
00128   //printf("cm_query_transition: status %d, tr %d, run %d, time %d\n",status,transition,run_number,trans_time);
00129   
00130   if (transition == TR_START)
00131     {
00132       if (fStartHandler)
00133         (*fStartHandler)(transition,run_number,trans_time);
00134       return true;
00135     }
00136   else if (transition == TR_STOP)
00137     {
00138       if (fStopHandler)
00139         (*fStopHandler)(transition,run_number,trans_time);
00140       return true;
00141       
00142     }
00143   else if (transition == TR_PAUSE)
00144     {
00145       if (fPauseHandler)
00146         (*fPauseHandler)(transition,run_number,trans_time);
00147       return true;
00148       
00149     }
00150   else if (transition == TR_RESUME)
00151     {
00152       if (fResumeHandler)
00153         (*fResumeHandler)(transition,run_number,trans_time);
00154       return true;
00155     }
00156   
00157   return false;
00158 }

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int TMidasOnline::connect	(	const char *	hostname,
		const char *	exptname,
		const char *	progname
	)

Connect to MIDAS experiment.

Definition at line 46 of file TMidasOnline.cxx.

References fDB, fExptname, and fHostname.

Referenced by main().

00047 {
00048   int status;
00049   
00050   char xhostname[HOST_NAME_LENGTH];
00051   char xexptname[NAME_LENGTH];
00052   
00053   /* get default from environment */
00054   status = cm_get_environment(xhostname, sizeof(xhostname), xexptname, sizeof(xexptname));
00055   assert(status == CM_SUCCESS);
00056   
00057   if (hostname)
00058     strlcpy(xhostname,hostname,sizeof(xhostname));
00059   
00060   if (exptname)
00061     strlcpy(xexptname,exptname,sizeof(xexptname));
00062   
00063   fHostname = xhostname;
00064   fExptname = xexptname;
00065 
00066   fprintf(stderr, "TMidasOnline::connect: Connecting to experiment \"%s\" on host \"%s\"\n", fExptname.c_str(), fHostname.c_str());
00067   
00068   //int watchdog = DEFAULT_WATCHDOG_TIMEOUT;
00069   int watchdog = 60*1000;
00070 
00071   status = cm_connect_experiment1((char*)fHostname.c_str(), (char*)fExptname.c_str(), (char*)progname, NULL, DEFAULT_ODB_SIZE, watchdog);
00072   
00073   if (status == CM_UNDEF_EXP)
00074     {
00075       fprintf(stderr, "TMidasOnline::connect: Error: experiment \"%s\" not defined.\n", fExptname.c_str());
00076       return -1;
00077     }
00078   else if (status != CM_SUCCESS)
00079     {
00080       fprintf(stderr, "TMidasOnline::connect: Cannot connect to MIDAS, status %d.\n", status);
00081       return -1;
00082     }
00083   
00084   status = cm_get_experiment_database(&fDB, NULL);
00085   assert(status == CM_SUCCESS);
00086   
00087   cm_set_watchdog_params(true, 60*1000);
00088 
00089   return 0;
00090 }

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void TMidasOnline::deleteEventRequest ( int requestId )

Delete data request.

Definition at line 314 of file TMidasOnline.cxx.

References fEventRequests, and EventRequest::fNext.

00315 {
00316   for (EventRequest* r = fEventRequests; r != NULL; r = r->fNext)
00317     if (r->fRequestId == requestId)
00318       {
00319         int status = bm_delete_request(r->fRequestId);
00320         assert(status == BM_SUCCESS);
00321         
00322         r->fBufferHandle = -1;
00323         r->fRequestId    = -1;
00324       }
00325 }

int TMidasOnline::disconnect ( )

Disconnect from MIDAS.

Definition at line 92 of file TMidasOnline.cxx.

References fDB, fExptname, and fHostname.

Referenced by poll(), and ~TMidasOnline().

00093 {
00094   if (fDB)
00095     {
00096       fprintf(stderr, "TMidasOnline::disconnect: Disconnecting from experiment \"%s\" on host \"%s\"\n", fExptname.c_str(), fHostname.c_str());
00097       cm_disconnect_experiment();
00098       fDB = 0;
00099     }
00100   
00101   return 0;
00102 }

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int TMidasOnline::eventRequest	(	const char *	bufferName,
		int	eventId,
		int	triggerMask,
		int	samplingType,
		bool	poll = `false`
	)

Request data for delivery via callback (setEventHandler) or by polling (via receiveEvent).

Definition at line 250 of file TMidasOnline.cxx.

References EVENT_BUFFER_SIZE, eventCallback(), EventRequest::fBufferHandle, EventRequest::fBufferName, EventRequest::fEventId, fEventRequests, EventRequest::fNext, EventRequest::fRequestId, EventRequest::fSamplingType, and EventRequest::fTriggerMask.

00251 {
00252   int status;
00253   EventRequest* r = new EventRequest();
00254 
00255   if (bufferName == NULL)
00256     bufferName = EVENT_BUFFER_NAME;
00257   
00258   r->fNext         = NULL;
00259   r->fBufferName   = bufferName;
00260   r->fEventId      = eventId;
00261   r->fTriggerMask  = triggerMask;
00262   r->fSamplingType = samplingType;
00263   
00264   
00265   /*---- open event buffer ---------------------------------------*/
00266   status = bm_open_buffer((char*)bufferName, EVENT_BUFFER_SIZE, &r->fBufferHandle);
00267   if (status!=SUCCESS && status!=BM_CREATED)
00268     {
00269       fprintf(stderr, "TMidasOnline::eventRequest: Cannot find data buffer \"%s\", bm_open_buffer() error %d\n", bufferName, status);
00270       return -1;
00271     }
00272   
00273   /* set the default buffer cache size (but not GET_RECENT sampling type*/
00274         if(samplingType != GET_RECENT){
00275                 status = bm_set_cache_size(r->fBufferHandle, 100000, 0);
00276                 assert(status == BM_SUCCESS);
00277         }
00278 
00279   if (poll)
00280     status = bm_request_event(r->fBufferHandle, r->fEventId, r->fTriggerMask, r->fSamplingType, &r->fRequestId, NULL);
00281   else
00282     status = bm_request_event(r->fBufferHandle, r->fEventId, r->fTriggerMask, r->fSamplingType, &r->fRequestId, eventCallback);
00283   assert(status == BM_SUCCESS);
00284   
00285   fprintf(stderr, "TMidasOnline::eventRequest: Event request: buffer \"%s\" (%d), event id 0x%x, trigger mask 0x%x, sample %d, request id: %d\n",bufferName,r->fBufferHandle,r->fEventId,r->fTriggerMask,r->fSamplingType,r->fRequestId);
00286   
00287   r->fNext = fEventRequests;
00288   fEventRequests = r;
00289   
00290   return r->fRequestId;
00291 };

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int TMidasOnline::getBufferLevel ( )

Get buffer level (ie the number of bytes in buffer).

Definition at line 293 of file TMidasOnline.cxx.

References EventRequest::fBufferHandle, and fEventRequests.

00293                                 {
00294 
00295   if(!fEventRequests || !fEventRequests->fBufferHandle) return -1;
00296 
00297   int n_bytes;
00298   bm_get_buffer_level(fEventRequests->fBufferHandle, &n_bytes);
00299 
00300   return n_bytes;
00301 
00302 }

int TMidasOnline::getBufferSize ( )

Get buffer size.

Definition at line 304 of file TMidasOnline.cxx.

References EventRequest::fBufferHandle, and fEventRequests.

00304                                {
00305 
00306   if(!fEventRequests || !fEventRequests->fBufferHandle) return -1;
00307 
00308   BUFFER_HEADER buffer_header;
00309   bm_get_buffer_info(fEventRequests->fBufferHandle,&buffer_header);      
00310 
00311   return buffer_header.size;
00312 
00313 }

TMidasOnline * TMidasOnline::instance ( ) [static]

TMidasOnline is a singleton class. Call instance() to get a reference to the one instance of this class.

Definition at line 38 of file TMidasOnline.cxx.

References gfMidas, and TMidasOnline().

Referenced by eventCallback(), and main().

00039 {
00040   if (!gfMidas)
00041     gfMidas = new TMidasOnline();
00042   
00043   return gfMidas;
00044 }

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int TMidasOnline::odbReadAny	(	const char *	name,
		int	index,
		int	tid,
		void *	buf,
		int	bufsize = `0`
	)			`[virtual]`

Read value of arbitrary type.

Implements VirtualOdb.

Definition at line 403 of file TMidasOnline.cxx.

References fDB.

Referenced by odbReadBool(), odbReadDouble(), odbReadFloat(), odbReadInt(), odbReadString(), and odbReadUint32().

00404 {
00405   int status;
00406   int size = bufsize; 
00407   HNDLE hdir = 0;
00408   HNDLE hkey;
00409 
00410   if (size == 0)
00411     size = rpc_tid_size(tid);
00412 
00413   status = db_find_key (fDB, hdir, (char*)name, &hkey);
00414   if (status == SUCCESS)
00415     {
00416       status = db_get_data_index(fDB, hkey, buf, &size, index, tid);
00417       if (status != SUCCESS)
00418         {
00419           cm_msg(MERROR, "TMidasOnline", "Cannot read \'%s\'[%d] of type %d from odb, db_get_data_index() status %d", name, index, tid, status);
00420           return -1;
00421         }
00422 
00423       return 0;
00424     }
00425   else if (status == DB_NO_KEY)
00426     {
00427       cm_msg(MINFO, "TMidasOnline", "Creating \'%s\'[%d] of type %d", name, index, tid);
00428 
00429       status = db_create_key(fDB, hdir, (char*)name, tid);
00430       if (status != SUCCESS)
00431         {
00432           cm_msg (MERROR, "TMidasOnline", "Cannot create \'%s\' of type %d, db_create_key() status %d", name, tid, status);
00433           return -1;
00434         }
00435 
00436       status = db_find_key (fDB, hdir, (char*)name, &hkey);
00437       if (status != SUCCESS)
00438         {
00439           cm_msg(MERROR, "TMidasOnline", "Cannot create \'%s\', db_find_key() status %d", name, status);
00440           return -1;
00441         }
00442 
00443       status = db_set_data_index(fDB, hkey, buf, size, index, tid);
00444       if (status != SUCCESS)
00445         {
00446           cm_msg(MERROR, "TMidasOnline", "Cannot write \'%s\'[%d] of type %d to odb, db_set_data_index() status %d", name, index, tid, status);
00447           return -1;
00448         }
00449 
00450       return 0;
00451     }
00452   else
00453     {
00454       cm_msg(MERROR, "TMidasOnline", "Cannot read \'%s\'[%d] from odb, db_find_key() status %d", name, index, status);
00455       return -1;
00456     }
00457 };

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int TMidasOnline::odbReadArraySize ( const char * name ) [virtual]

Read size of an array.

Implements VirtualOdb.

Definition at line 385 of file TMidasOnline.cxx.

References fDB.

00386 {
00387   int status;
00388   HNDLE hdir = 0;
00389   HNDLE hkey;
00390   KEY key;
00391 
00392   status = db_find_key (fDB, hdir, (char*)name, &hkey);
00393   if (status != SUCCESS)
00394     return 0;
00395 
00396   status = db_get_key(fDB, hkey, &key);
00397   if (status != SUCCESS)
00398     return 0;
00399 
00400   return key.num_values;
00401 }

bool TMidasOnline::odbReadBool	(	const char *	name,
		int	index = `0`,
		bool	defaultValue = `false`
	)			`[virtual]`

Read a boolean value, midas type TID_BOOL.

Implements VirtualOdb.

Definition at line 348 of file TMidasOnline.cxx.

References odbReadAny().

00349 {
00350   uint32_t value = defaultValue;
00351   if (odbReadAny(name,index,TID_BOOL,&value) == 0)
00352     return value;
00353   else
00354     return defaultValue;
00355 };

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double TMidasOnline::odbReadDouble	(	const char *	name,
		int	index = `0`,
		double	defaultValue = `0`
	)			`[virtual]`

Read an 64-bit floating point value, midas type TID_DOUBLET.

Implements VirtualOdb.

Definition at line 366 of file TMidasOnline.cxx.

References odbReadAny().

00367 {
00368   double value = defaultValue;
00369   if (odbReadAny(name,index,TID_DOUBLE,&value) == 0)
00370     return value;
00371   else
00372     return defaultValue;
00373 };

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float TMidasOnline::odbReadFloat	(	const char *	name,
		int	index = `0`,
		float	defaultValue = `0`
	)			`[virtual]`

Read an 32-bit floating point value, midas type TID_FLOAT.

Implements VirtualOdb.

Definition at line 357 of file TMidasOnline.cxx.

References odbReadAny().

00358 {
00359   float value = defaultValue;
00360   if (odbReadAny(name,index,TID_FLOAT,&value) == 0)
00361     return value;
00362   else
00363     return defaultValue;
00364 };

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int TMidasOnline::odbReadInt	(	const char *	name,
		int	index = `0`,
		int	defaultValue = `0`
	)			`[virtual]`

Read an integer value, midas type TID_INT.

Implements VirtualOdb.

Definition at line 330 of file TMidasOnline.cxx.

References odbReadAny().

00331 {
00332   int value = defaultValue;
00333   if (odbReadAny(name,index,TID_INT,&value) == 0)
00334     return value;
00335   else
00336     return defaultValue;
00337 };

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const char * TMidasOnline::odbReadString	(	const char *	name,
		int	index = `0`,
		const char *	defaultValue = `NULL`
	)			`[virtual]`

Read a string value, midas type TID_STRING.

Implements VirtualOdb.

Definition at line 375 of file TMidasOnline.cxx.

References odbReadAny().

00376 {
00377   const int bufsize = 1024;
00378   static char buf[bufsize];
00379   if (odbReadAny(name, index, TID_STRING, buf, bufsize) == 0)
00380     return buf;
00381   else
00382     return defaultValue;
00383 };

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uint32_t TMidasOnline::odbReadUint32	(	const char *	name,
		int	index = `0`,
		uint32_t	defaultValue = `0`
	)			`[virtual]`

Read an unsigned 32-bit integer value, midas type TID_DWORD.

Implements VirtualOdb.

Definition at line 339 of file TMidasOnline.cxx.

References odbReadAny().

00340 {
00341   uint32_t value = defaultValue;
00342   if (odbReadAny(name,index,TID_DWORD,&value) == 0)
00343     return value;
00344   else
00345     return defaultValue;
00346 };

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bool TMidasOnline::poll ( int mdelay )

Check for MIDAS events (run transitions, data requests).

Definition at line 160 of file TMidasOnline.cxx.

References checkTransitions(), and disconnect().

00161 {
00162   //printf("poll!\n");
00163   
00164   if (checkTransitions())
00165     return true;
00166   
00167   int status = cm_yield(mdelay);
00168   if (status == RPC_SHUTDOWN || status == SS_ABORT)
00169     {
00170       fprintf(stderr, "TMidasOnline::poll: cm_yield(%d) status %d, shutting down.\n",mdelay,status);
00171       disconnect();
00172       return false;
00173     }
00174   
00175   return true;
00176 }

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int TMidasOnline::receiveEvent	(	int	requestId,
		void *	pevent,
		int	size,
		bool	async
	)

Receive event by polling.

Definition at line 202 of file TMidasOnline.cxx.

References EventRequest::fBufferHandle, fEventRequests, EventRequest::fNext, and EventRequest::fRequestId.

00203 {
00204   EventRequest* r = fEventRequests;
00205 
00206   while (1)
00207     {
00208       if (!r)
00209         {
00210           fprintf(stderr, "TMidasOnline::receiveEvent: Cannot find request %d\n", requestId);
00211           return -1;
00212         }
00213 
00214       if (r->fRequestId == requestId)
00215         break;
00216 
00217       r = r->fNext;
00218     }
00219 
00220   int flag = 0;
00221   if (async){
00222 #ifdef BM_NO_WAIT
00223     flag = BM_NO_WAIT;
00224 #else
00225     flag = ASYNC;
00226 #endif
00227   }
00228 
00229 
00230   int status = bm_receive_event(r->fBufferHandle, pevent, &size, flag);
00231 
00232   if (status == BM_ASYNC_RETURN)
00233     {
00234       return 0;
00235     }
00236 
00237   if (status != BM_SUCCESS)
00238     {
00239       fprintf(stderr, "TMidasOnline::receiveEvent: bm_receive_event() error %d\n", status);
00240       return -1;
00241     }
00242 
00243   return size;
00244 }

void TMidasOnline::registerTransitions ( )

Ask MIDAS to tell us about run transitions.

Definition at line 104 of file TMidasOnline.cxx.

00105 {
00106   cm_register_transition(TR_START,  NULL, 300);
00107   cm_register_transition(TR_PAUSE,  NULL, 700);
00108   cm_register_transition(TR_RESUME, NULL, 300);
00109   cm_register_transition(TR_STOP,   NULL, 700);
00110 }

void TMidasOnline::setEventHandler ( EventHandler handler )

Specify user handler for data events.

Definition at line 178 of file TMidasOnline.cxx.

References fEventHandler.

00179 {
00180   fEventHandler  = handler;
00181 }

void TMidasOnline::setTransitionHandlers	(	TransitionHandler	start,
		TransitionHandler	stop,
		TransitionHandler	pause,
		TransitionHandler	resume
	)

Specify user handlers for run transitions.

Definition at line 112 of file TMidasOnline.cxx.

References fPauseHandler, fResumeHandler, fStartHandler, and fStopHandler.

00113 {
00114   fStartHandler  = start;
00115   fStopHandler   = stop;
00116   fPauseHandler  = pause;
00117   fResumeHandler = resume;
00118 }

Member Data Documentation

int TMidasOnline::fDB

ODB handle.

Definition at line 51 of file TMidasOnline.h.

Referenced by connect(), disconnect(), odbReadAny(), odbReadArraySize(), and TMidasOnline().

EventHandler TMidasOnline::fEventHandler

Definition at line 59 of file TMidasOnline.h.

Referenced by eventCallback(), setEventHandler(), and TMidasOnline().

EventRequest* TMidasOnline::fEventRequests

Definition at line 58 of file TMidasOnline.h.

Referenced by deleteEventRequest(), eventRequest(), getBufferLevel(), getBufferSize(), receiveEvent(), and TMidasOnline().

std::string TMidasOnline::fExptname

experiment name, blank if only one experiment defined in exptab

Definition at line 49 of file TMidasOnline.h.

Referenced by connect(), and disconnect().

std::string TMidasOnline::fHostname

hostname where the mserver is running, blank if using shared memory

Definition at line 48 of file TMidasOnline.h.

Referenced by connect(), and disconnect().

TransitionHandler TMidasOnline::fPauseHandler

Definition at line 55 of file TMidasOnline.h.

Referenced by checkTransitions(), setTransitionHandlers(), and TMidasOnline().

TransitionHandler TMidasOnline::fResumeHandler

Definition at line 56 of file TMidasOnline.h.

Referenced by checkTransitions(), setTransitionHandlers(), and TMidasOnline().

TransitionHandler TMidasOnline::fStartHandler

Definition at line 53 of file TMidasOnline.h.

Referenced by checkTransitions(), setTransitionHandlers(), and TMidasOnline().

TransitionHandler TMidasOnline::fStopHandler

Definition at line 54 of file TMidasOnline.h.

Referenced by checkTransitions(), setTransitionHandlers(), and TMidasOnline().

TMidasOnline * TMidasOnline::gfMidas = NULL [static, private]

TMidasOnline is a singleton class: only one instance is allowed at any time

Definition at line 64 of file TMidasOnline.h.

Referenced by instance().

The documentation for this class was generated from the following files:

libMidasInterface/TMidasOnline.h
libMidasInterface/TMidasOnline.cxx

TMidasOnline Class Reference

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Private Member Functions

Static Private Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation