Introduce lok_preinit() to preload all registered UNO implementations

Intended to be used from an application like the LibreOffice On-Line
server so that it can be called in a process that then will call
fork() several times, and much space consuming data will end up being
shared.

Change-Id: I65341c57d00308d246ec90deab8050b2c4bb3e61

4 files changed, 58 insertions, 0 deletions

diff --git a/cppuhelper/source/defaultbootstrap.cxx b/cppuhelper/source/defaultbootstrap.cxx
index bede6b518af0..c0a2c2edc6f7 100644
--- a/cppuhelper/source/defaultbootstrap.cxx
+++ b/cppuhelper/source/defaultbootstrap.cxx
@@ -18,6 +18,7 @@
 #include <com/sun/star/uno/XComponentContext.hpp>
 #include <com/sun/star/lang/XSingleComponentFactory.hpp>
 #include <cppuhelper/bootstrap.hxx>
+#include <cppuhelper/detail/preinit.hxx>
 #include <cppuhelper/component_context.hxx>
 #include <rtl/bootstrap.hxx>
 #include <rtl/ref.hxx>
@@ -107,4 +108,19 @@ cppu::defaultBootstrap_InitialComponentContext()
     return defaultBootstrap_InitialComponentContext(getUnoIniUri());
 }
 
+void
+cppu::preInitBootstrap()
+{
+    rtl::OUString iniUri(getUnoIniUri());
+    rtl::Bootstrap bs(iniUri);
+    if (bs.getHandle() == nullptr)
+        throw css::uno::DeploymentException("Cannot open uno ini " + iniUri);
+
+    // create the service manager
+    rtl::Reference< cppuhelper::ServiceManager > aManager(new cppuhelper::ServiceManager);
+    // read rdb files
+    aManager->init(getBootstrapVariable(bs, "UNO_SERVICES"));
+    aManager->loadAllImplementations();
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppuhelper/source/gcc3.map b/cppuhelper/source/gcc3.map
index 12c29834ab16..20d0e137eef6 100644
--- a/cppuhelper/source/gcc3.map
+++ b/cppuhelper/source/gcc3.map
@@ -436,3 +436,8 @@ GLIBCXX_3.4 {
         _ZGVNSt7num_put*; _ZNSt7num_put*;
         _ZNSs4_Rep20_S_empty_rep_storageE;
 };
+
+PRIVATE_1.0 { # LibO 5.2
+    global:
+        _ZN4cppu16preInitBootstrapEv;
+};
diff --git a/cppuhelper/source/servicemanager.cxx b/cppuhelper/source/servicemanager.cxx
index 2d824d4aaa3f..d89289a165a4 100644
--- a/cppuhelper/source/servicemanager.cxx
+++ b/cppuhelper/source/servicemanager.cxx
@@ -34,6 +34,7 @@
 #include <cppuhelper/implbase3.hxx>
 #include <cppuhelper/supportsservice.hxx>
 #include <osl/file.hxx>
+#include <osl/module.hxx>
 #include <rtl/ref.hxx>
 #include <rtl/uri.hxx>
 #include <rtl/ustring.hxx>
@@ -875,6 +876,40 @@ void cppuhelper::ServiceManager::loadImplementation(
     }
 }
 
+void cppuhelper::ServiceManager::loadAllImplementations()
+{
+    rtl::OUString aUri;
+    osl::MutexGuard g(rBHelper.rMutex);
+
+    for (Data::NamedImplementations::const_iterator iterator(
+            data_.namedImplementations.begin());
+            iterator != data_.namedImplementations.end(); ++iterator)
+    {
+        try
+        {
+            aUri = cppu::bootstrap_expandUri(iterator->second->info->uri);
+        }
+        catch (css::lang::IllegalArgumentException& aError)
+        {
+            throw css::uno::DeploymentException(
+                "Cannot expand URI" + iterator->second->info->uri + ": " + aError.Message,
+                static_cast< cppu::OWeakObject * >(this));
+        }
+
+        if (iterator->second->info->loader == "com.sun.star.loader.SharedLibrary" &&
+            iterator->second->status != Data::Implementation::STATUS_LOADED)
+        {
+            oslModule aModule = osl_loadModule( aUri.pData, SAL_LOADMODULE_NOW | SAL_LOADMODULE_GLOBAL );
+            SAL_INFO("lok", "loaded component library " << aUri << ( aModule ? " ok" : " no"));
+
+            // leak aModule
+            // osl_unloadModule(aModule);
+            if ( aModule )
+                iterator->second->status = Data::Implementation::STATUS_LOADED;
+        }
+    }
+}
+
 void cppuhelper::ServiceManager::disposing() {
     std::vector< css::uno::Reference<css::lang::XComponent> > sngls;
     std::vector< css::uno::Reference< css::lang::XComponent > > comps;
diff --git a/cppuhelper/source/servicemanager.hxx b/cppuhelper/source/servicemanager.hxx
index c217cbce39f5..7e8f4e66e7e6 100644
--- a/cppuhelper/source/servicemanager.hxx
+++ b/cppuhelper/source/servicemanager.hxx
@@ -203,6 +203,8 @@ public:
         css::uno::Reference< css::uno::XComponentContext > const & context,
         std::shared_ptr< Data::Implementation > & implementation);
 
+    void loadAllImplementations();
+
 private:
     virtual ~ServiceManager();