private void updateConnections(PropertyChangeEvent ev) {

		PluginTool tool = (PluginTool) ev.getSource();
		updateConnectMap(tool);

		// notify listeners of tool change
		firePropertyChangeEvent(ev);
	}
Get the key for the connection map.

@param producer tool producing an event
@param consumer tool consuming an event
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/tool/ToolManagerImpl.java