Michael Davidsaver
6d1216daad
add pvalink json schema avoid JSON5 in testpvalink for portability. fixup build with pvalink trap bad_weak_ptr open during dtor Not sure why this is happening, but need not be CRIT. c++11, cleanup, and notes fix pvalink test sync fix test cleanup on exit pvalink disconnected link is always INVALID pvalink logging pvalink capture Disconnect time pvalink eliminate providerName restrict local to dbChannelTest() aka. no qsrv groups pvalink onTypeChange when attaching link to existing channel pvalink eliminate unused Connecting state pvalink add InstCounter pvalink AfterPut can be const pvalink add atomic jlif flag include epicsStdio.h later avoid #define printf troubles assert cleanup state on exit pvalink add newer lset functions test link disconnect testpvalink redo testPutAsync() pvalink fill out meta-data fetch pvalink fix FLNK pvalink cache putReq pvalink test atomic monitor pvalink test enum handling pvalink handle scalar read of empty array make it well defined anyway... pvalink test array of strings handle db_add_event() failure handle record._options.DBE
84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is 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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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#ifndef PVXS_SUBSCRIPTIONCTX_H
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#define PVXS_SUBSCRIPTIONCTX_H
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#include <memory>
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#include <stdexcept>
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#include <type_traits>
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#include <dbEvent.h>
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#include "channel.h"
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#include "dbeventcontextdeleter.h"
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namespace pvxs {
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namespace ioc {
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class Subscription {
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std::shared_ptr<std::remove_pointer<dbEventSubscription>::type> sub; // holds void* returned by db_add_event()
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public:
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/* Add a subscription event by calling db_add_event using the given subscriptionCtx
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* and selecting the correct elements based on the given type of event being added.
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* You need to specify the correct options that correspond to the event type.
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* Adds a deleter to clean up the subscription by calling db_cancel_event.
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*/
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void subscribe(dbEventCtx context,
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const Channel& pChan,
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EVENTFUNC *user_sub, void *user_arg, unsigned select)
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{
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auto chan(pChan); // bind by value
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sub.reset(db_add_event(context, chan,
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user_sub, user_arg, select),
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[chan](dbEventSubscription sub) mutable
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{
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if(sub)
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db_cancel_event(sub);
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chan = Channel(); // dbChannel* must outlive subscription
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});
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if(!sub)
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throw std::runtime_error("Failed to create db subscription");
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}
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void cancel() {
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sub.reset();
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}
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void enable() {
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if(sub) {
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db_event_enable(sub.get());
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db_post_single_event(sub.get());
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}
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}
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void disable() {
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if(sub)
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db_event_disable(sub.get());
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}
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};
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/**
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* A subscription context
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*/
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class SubscriptionCtx {
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public:
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// For locking access to subscription context
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Subscription pValueEventSubscription;
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Subscription pPropertiesEventSubscription;
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bool hadValueEvent = false;
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bool hadPropertyEvent = false;
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void cancel() {
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pValueEventSubscription.cancel();
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pPropertiesEventSubscription.cancel();
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}
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};
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} // ioc
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} // pvxs
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#endif //PVXS_SUBSCRIPTIONCTX_H
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