From cd292163113134ccb7e037da70718bb6aaf6567c Mon Sep 17 00:00:00 2001
From: randomdan <randomdan@localhost>
Date: Fri, 13 Sep 2013 17:34:05 +0000
Subject: Add a module for preloading libraries, which supersedes that in
 daemon

---
 project2/basics/Jamfile.jam           |  2 ++
 project2/basics/preload.cpp           | 52 +++++++++++++++++++++++++++++++++++
 project2/daemon/p2daemonAppEngine.cpp | 18 ++----------
 project2/daemon/p2daemonAppEngine.h   |  4 ---
 4 files changed, 56 insertions(+), 20 deletions(-)
 create mode 100644 project2/basics/preload.cpp

diff --git a/project2/basics/Jamfile.jam b/project2/basics/Jamfile.jam
index b276ba1..02de4c3 100644
--- a/project2/basics/Jamfile.jam
+++ b/project2/basics/Jamfile.jam
@@ -3,6 +3,7 @@ alias glibmm : : : :
 	<linkflags>"`pkg-config --libs glibmm-2.4`"
 	;
 lib boost_filesystem : : <name>boost_filesystem ;
+lib dl ;
 
 cpp-pch pch : pch.hpp :
 	<include>../../libmisc
@@ -16,6 +17,7 @@ lib p2basics :
 	<include>.
 	<include>../../libmisc
 	<library>glibmm
+	<library>dl
 	<library>boost_filesystem
 	<library>../common//p2common
 	;
diff --git a/project2/basics/preload.cpp b/project2/basics/preload.cpp
new file mode 100644
index 0000000..e8aa6e9
--- /dev/null
+++ b/project2/basics/preload.cpp
@@ -0,0 +1,52 @@
+#include <pch.hpp>
+#include <options.h>
+#include <boost/filesystem/path.hpp>
+#include <map>
+#include <dlfcn.h>
+
+using namespace boost::filesystem;
+
+class Preload {
+	public:
+		INITOPTIONS;
+
+	private:
+		typedef boost::shared_ptr<void> Library;
+		typedef std::map<path, Library> Libraries;
+
+		static void LoadLibrary(const VariableType & librarypath)
+		{
+			const auto beforeOpts = *Plugable::ComponentType<Options>::components();
+
+			void * handle = dlopen(librarypath, RTLD_NOW); 
+			if (handle) {
+				Logger()->messagebf(LOG_DEBUG, "Loaded library '%s'", librarypath.as<std::string>());
+			}
+			else {
+				Logger()->messagebf(LOG_ERR, "Failed to load library '%s' (%s)", librarypath.as<std::string>(), dlerror());
+				throw std::runtime_error("module load failed");
+			}
+			libs[librarypath.as<std::string>()] = boost::shared_ptr<void>(handle, &dlclose);
+
+			const auto afterOpts = Plugable::ComponentType<Options>::components();
+			BOOST_FOREACH(const auto & opt, *afterOpts) {
+				if (std::find(beforeOpts.begin(), beforeOpts.end(), opt) == beforeOpts.end()) {
+					opt->reset();
+				}
+			}
+		}
+
+		static void UnloadLibraries()
+		{
+			libs.clear();
+		}
+
+		static Libraries libs;
+};
+
+Preload::Libraries Preload::libs;
+
+DECLARE_OPTIONS(Preload, "Library preload options")
+("library", Options::functions(Preload::LoadLibrary, Preload::UnloadLibraries), "Libraries to preload")
+END_OPTIONS(Preload)
+
diff --git a/project2/daemon/p2daemonAppEngine.cpp b/project2/daemon/p2daemonAppEngine.cpp
index cb414c5..7daed70 100644
--- a/project2/daemon/p2daemonAppEngine.cpp
+++ b/project2/daemon/p2daemonAppEngine.cpp
@@ -1,20 +1,18 @@
 #include "p2daemonAppEngine.h"
 #include <logger.h>
+#include <optionsSource.h>
 #include <dlfcn.h>
 
 std::string DaemonAppEngine::daemonType;
-boost::optional<std::string> DaemonAppEngine::libraryPath;
 Glib::ustring DaemonAppEngine::reqPlatform;
 DaemonPtr DaemonAppEngine::daemon;
 
 DECLARE_OPTIONS(DaemonAppEngine, "Project2 Daemon options")
 ("daemon.type", Options::value(&daemonType), "The core daemon module to run")
-("daemon.library", Options::value(&libraryPath), "The optional library containing the core daemon to load")
 ("daemon.platform", Options::value(&reqPlatform), "Platform")
 END_OPTIONS(DaemonAppEngine);
 
-DaemonAppEngine::DaemonAppEngine(int argc, char ** argv) :
-	library(!!libraryPath ? loadLibrary(*libraryPath) : boost::shared_ptr<void>())
+DaemonAppEngine::DaemonAppEngine(int argc, char ** argv)
 {
 	daemon = DaemonLoader::createNew(daemonType, argc, argv);
 }
@@ -54,15 +52,3 @@ DaemonAppEngine::process() const
 	Logger()->message(LOG_INFO, "Daemon exitted.");
 }
 
-boost::shared_ptr<void>
-DaemonAppEngine::loadLibrary(const std::string & path)
-{
-	void * handle = dlopen(path.c_str(), RTLD_NOW); 
-	if (!handle) {
-		Logger()->messagebf(LOG_ERR, "Failed to load library '%s' (%s)", path, dlerror());
-		throw std::runtime_error("module load failed");
-	}
-	return boost::shared_ptr<void>(handle, &dlclose);
-}
-
-
diff --git a/project2/daemon/p2daemonAppEngine.h b/project2/daemon/p2daemonAppEngine.h
index 236bef6..e6632f2 100644
--- a/project2/daemon/p2daemonAppEngine.h
+++ b/project2/daemon/p2daemonAppEngine.h
@@ -16,12 +16,8 @@ class DaemonAppEngine {
 
 		static Glib::ustring reqPlatform;
 		static std::string daemonType;
-		static boost::optional<std::string> libraryPath;
 
 	private:
-		static boost::shared_ptr<void> loadLibrary(const std::string & path);
-
-		boost::shared_ptr<void> library;
 		static void shutdown(int);
 		static DaemonPtr daemon;
 };
-- 
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