From aeb5066cbab18532ae9d08677faea8efcd56099f Mon Sep 17 00:00:00 2001
From: Ian Hunt-Isaak <ianhuntisaak@gmail.com>
Date: Sun, 27 Feb 2022 23:13:09 -0500
Subject: [PATCH] add callbacks for device (un)loading

---
 MMCore/MMCore.cpp        | 14 ++++++++++++++
 MMCore/MMEventCallback.h | 14 ++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/MMCore/MMCore.cpp b/MMCore/MMCore.cpp
index f4f68f23e..91a150075 100644
--- a/MMCore/MMCore.cpp
+++ b/MMCore/MMCore.cpp
@@ -721,6 +721,11 @@ void CMMCore::loadDevice(const char* label, const char* moduleName, const char*
 
    LOG_INFO(coreLogger_) << "Did load device " << deviceName <<
       " from " << moduleName << "; label = " << label;
+
+   if (externalCallback_ != 0) 
+   {
+      externalCallback_->onDeviceLoaded(label);
+   }
 }
 
 void CMMCore::assignDefaultRole(boost::shared_ptr<DeviceInstance> pDevice)
@@ -783,6 +788,11 @@ void CMMCore::unloadDevice(const char* label///< the name of the device to unloa
 {
    boost::shared_ptr<DeviceInstance> pDevice = deviceManager_->GetDevice(label);
 
+   if (externalCallback_ != 0) 
+   {
+      externalCallback_->onDeviceWillBeUnloaded(label);
+   }
+
    try {
       mm::DeviceModuleLockGuard guard(pDevice);
       LOG_DEBUG(coreLogger_) << "Will unload device " << label;
@@ -819,6 +829,10 @@ void CMMCore::unloadAllDevices() throw (CMMError)
       }
 
       LOG_DEBUG(coreLogger_) << "Will unload all devices";
+      if (externalCallback_ != 0) 
+      {
+         externalCallback_->onAllDevicesWillBeUnloaded();
+      }
       deviceManager_->UnloadAllDevices();
       LOG_INFO(coreLogger_) << "Did unload all devices";
 
diff --git a/MMCore/MMEventCallback.h b/MMCore/MMEventCallback.h
index 638508808..4b05ef7d3 100644
--- a/MMCore/MMEventCallback.h
+++ b/MMCore/MMEventCallback.h
@@ -89,4 +89,18 @@ class MMEventCallback
       std::cout << "onSLMExposureChanged()" << name << " " << newExposure << "\n";
    }
 
+   virtual void onDeviceLoaded(const char* name)
+   {
+      std::cout << "onDeviceLoaded " << name;
+   }
+
+   virtual void onDeviceWillBeUnloaded(const char* name)
+   {
+      std::cout << "onDeviceWillBeUnloaded " << name;
+   }
+
+   virtual void onAllDevicesWillBeUnloaded()
+   {
+      std::cout << "onAllDevicesWillBeUnloaded ";
+   }
 };