1 files changed, 53 insertions, 0 deletions
diff --git a/indra/llcommon/lazyeventapi.cpp b/indra/llcommon/lazyeventapi.cpp
new file mode 100644
index 0000000000..aefc2db6da
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+++ b/indra/llcommon/lazyeventapi.cpp
@@ -0,0 +1,53 @@
+/**
+ * @file   lazyeventapi.cpp
+ * @author Nat Goodspeed
+ * @date   2022-06-17
+ * @brief  Implementation for lazyeventapi.
+ * 
+ * $LicenseInfo:firstyear=2022&license=viewerlgpl$
+ * Copyright (c) 2022, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "lazyeventapi.h"
+// STL headers
+// std headers
+// external library headers
+// other Linden headers
+#include "llevents.h"
+
+LL::LazyEventAPIBase::LazyEventAPIBase(
+    const std::string& name, const std::string& desc, const std::string& field)
+{
+    // populate embedded LazyEventAPIParams instance
+    mParams.name = name;
+    mParams.desc = desc;
+    mParams.field = field;
+    // mParams.init and mOperations are populated by subsequent add() calls.
+
+    // Our raison d'etre: register as an LLEventPumps::PumpFactory
+    // so obtain() will notice any request for this name and call us.
+    // Of course, our subclass constructor must finish running (making add()
+    // calls) before mParams will be fully populated, but we expect that to
+    // happen well before the first LLEventPumps::obtain(name) call.
+    mRegistered = LLEventPumps::instance().registerPumpFactory(
+        name,
+        [this](const std::string& name){ return construct(name); });
+}
+
+LL::LazyEventAPIBase::~LazyEventAPIBase()
+{
+    // If our constructor's registerPumpFactory() call was unsuccessful, that
+    // probably means somebody else claimed the name first. If that's the
+    // case, do NOT unregister their name out from under them!
+    // If this is a static instance being destroyed at process shutdown,
+    // LLEventPumps will probably have been cleaned up already.
+    if (mRegistered && ! LLEventPumps::wasDeleted())
+    {
+        // unregister the callback to this doomed instance
+        LLEventPumps::instance().unregisterPumpFactory(mParams.name);
+    }
+}