From 9e115470654bf67fbb4720ab3bfb3768b9331e55 Mon Sep 17 00:00:00 2001
From: Alan Conway <aconway@apache.org>
Date: Thu, 26 Jun 2008 21:39:28 +0000
Subject: Plugin framework change: single PluginFactory creates per-target
 Plugin instances.

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@672032 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/Plugin.cpp | 55 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 36 insertions(+), 19 deletions(-)

(limited to 'cpp/src/qpid/Plugin.cpp')

diff --git a/cpp/src/qpid/Plugin.cpp b/cpp/src/qpid/Plugin.cpp
index 733d134334..84dc5a0107 100644
--- a/cpp/src/qpid/Plugin.cpp
+++ b/cpp/src/qpid/Plugin.cpp
@@ -19,36 +19,53 @@
  */
 
 #include "Plugin.h"
-#include "qpid/Options.h"
+#include <qpid/shared_ptr.h>
+#include <qpid/Options.h>
+#include <qpid/sys/Mutex.h>
 
 namespace qpid {
 
-namespace {
-Plugin::Plugins& thePlugins() {
-    // This is a single threaded singleton implementation so
-    // it is important to be sure that the first use of this
-    // singleton is when the program is still single threaded
-    static Plugin::Plugins plugins;
-    return plugins;
-}
+Plugin::Target::~Target() {}
+
+void Plugin::Target::createPlugins() {
+    typedef std::vector<Plugin::Factory*>::const_iterator Iter; 
+    for (Iter i = Factory::getList().begin(); i != Factory::getList().end(); ++i) {
+        boost::shared_ptr<Plugin> plugin = (**i).create(*this);
+        if (plugin)
+            plugins.push_back(plugin);
+    }
 }
 
-Plugin::Plugin() {
-    // Register myself.
-    thePlugins().push_back(this);
+void Plugin::Target::initializePlugins() {
+    typedef std::vector<boost::shared_ptr<Plugin> >::iterator Iter; 
+    for (Iter i = plugins.begin(); i != plugins.end(); ++i) 
+        (**i).initialize(*this);
 }
 
-Plugin::~Plugin() {}
+void Plugin::Target::releasePlugins() { plugins.clear(); }
+
+Plugin::Factory::~Factory() {}
 
-Options*  Plugin::getOptions() { return 0; }
+Plugin::Factory::Factory() {
+    const_cast<std::vector<Plugin::Factory*>& >(getList()).push_back(this);
+}
+
+static sys::PODMutex PluginFactoryGetListLock;
 
-const Plugin::Plugins& Plugin::getPlugins() { return thePlugins(); }
+const std::vector<Plugin::Factory*>& Plugin::Factory::getList() {
+    sys::PODMutex::ScopedLock l(PluginFactoryGetListLock);
+    static std::vector<Plugin::Factory*> list;
+    return list;
+}
 
-void Plugin::addOptions(Options& opts) {
-    for (Plugins::const_iterator i = getPlugins().begin(); i != getPlugins().end(); ++i) {
-        if ((*i)->getOptions())
-            opts.add(*(*i)->getOptions());
+void Plugin::Factory::addOptions(Options& opts) {
+    typedef std::vector<Plugin::Factory*>::const_iterator Iter; 
+    for (Iter i = Factory::getList().begin(); i != Factory::getList().end(); ++i) {
+        if ((**i).getOptions())
+            opts.add(*(**i).getOptions());
     }
 }
 
+Plugin::~Plugin() {}
+
 } // namespace qpid
-- 
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