84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
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/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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*
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* Author Jeffrey O. Hill
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* johill@lanl.gov
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* 505 665 1831
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*/
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#include "beaconAnomalyGovernor.h"
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#include "beaconTimer.h"
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#include "server.h"
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//
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// the minimum period between beacon anomalies
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// -------------------------------------------
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//
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// o Gateways imply a tradeoff towards less traffic while
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// paying a price of a less tightly coupled environment.
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// Therefore, clients should not expect instant reconnects
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// when a server is rebooted on the other side of a gateway.
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//
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// o In a quiescent system servers should not need to be
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// rebooted and network connectivity should be constant.
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//
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// o Clients will keep trying to reach channels for around
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// 15 min after the last beacon anomaly was seen.
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//
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// o The exponential backoff mechanism in the beacon timer
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// ensures that clients will detect beacon anomalies
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// continuously for around 30 seconds after each beacon
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// anomaly is requested.
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//
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static const double CAServerMinBeaconAnomalyPeriod = 60.0 * 5.0; // seconds
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beaconAnomalyGovernor::beaconAnomalyGovernor ( caServerI & casIn ) :
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timer ( fileDescriptorManager.createTimer () ), cas ( casIn ),
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anomalyPending ( false )
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{
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}
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beaconAnomalyGovernor::~beaconAnomalyGovernor()
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{
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}
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void beaconAnomalyGovernor::start ()
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{
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// order of operations here impacts thread safety
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this->anomalyPending = true;
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epicsTimer::expireInfo expInfo = this->timer.getExpireInfo ();
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if ( ! expInfo.active ) {
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this->cas.beaconTmr.generateBeaconAnomaly ();
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this->timer.start ( *this, CAServerMinBeaconAnomalyPeriod );
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this->anomalyPending = false;
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}
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}
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epicsTimerNotify::expireStatus beaconAnomalyGovernor::expire ( const epicsTime & )
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{
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if ( this->anomalyPending ) {
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this->anomalyPending = false;
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this->cas.beaconTmr.generateBeaconAnomaly ();
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}
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return noRestart;
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}
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void beaconAnomalyGovernor::show ( unsigned level ) const
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{
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printf ( "beaconAnomalyGovernor: anomalyPending = %s\n",
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this->anomalyPending ? "T": "F" );
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if ( level ) {
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this->timer.show ( level - 1 );
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}
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}
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