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This commit is contained in:
Guenter Obiltschnig
2007-04-27 13:25:16 +00:00
parent 5caf218376
commit 4d80e24d44
28 changed files with 244 additions and 165 deletions
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43
Foundation/include/Poco/ClassLoader.h
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@@ -1,7 +1,7 @@
//
// ClassLoader.h
//
// $Id: //poco/Main/Foundation/include/Poco/ClassLoader.h#2 $
// $Id: //poco/Main/Foundation/include/Poco/ClassLoader.h#3 $
//
// Library: Foundation
// Package: SharedLibrary
@@ -62,6 +62,15 @@ class ClassLoader
/// The Manifest for a shared library can be easily built
/// with the help of the macros in the header file
/// "Foundation/ClassLibrary.h".
///
/// Starting with POCO release 1.3, a class library can
/// export multiple manifests. In addition to the default
/// (unnamed) manifest, multiple named manifests can
/// be exported, each having a different base class.
///
/// There is one important restriction: one instance of
/// ClassLoader can only load one manifest from a class
/// library.
{
public:
typedef AbstractMetaObject<Base> Meta;
@@ -152,9 +161,9 @@ public:
}
}
void loadLibrary(const std::string& path)
/// Loads a library from the given path. Does nothing
/// if the library is already loaded.
void loadLibrary(const std::string& path, const std::string& manifest)
/// Loads a library from the given path, using the given manifest.
/// Does nothing if the library is already loaded.
/// Throws a LibraryLoadException if the library
/// cannot be loaded or does not have a Manifest.
/// If the library exports a function named "pocoInitializeLibrary",
@@ -174,20 +183,22 @@ public:
li.refCount = 1;
try
{
std::string pocoBuildManifestSymbol("pocoBuildManifest");
pocoBuildManifestSymbol.append(manifest);
if (li.pLibrary->hasSymbol("pocoInitializeLibrary"))
{
InitializeLibraryFunc initializeLibrary = (InitializeLibraryFunc) li.pLibrary->getSymbol("pocoInitializeLibrary");
initializeLibrary();
}
if (li.pLibrary->hasSymbol("pocoBuildManifest"))
if (li.pLibrary->hasSymbol(pocoBuildManifestSymbol))
{
BuildManifestFunc buildManifest = (BuildManifestFunc) li.pLibrary->getSymbol("pocoBuildManifest");
BuildManifestFunc buildManifest = (BuildManifestFunc) li.pLibrary->getSymbol(pocoBuildManifestSymbol);
if (buildManifest(const_cast<Manif*>(li.pManifest)))
_map[path] = li;
else
throw LibraryLoadException(std::string("Manifest class mismatch in ") + path);
throw LibraryLoadException(std::string("Manifest class mismatch in ") + path, manifest);
}
else throw LibraryLoadException(std::string("No manifest in ") + path);
else throw LibraryLoadException(std::string("No manifest in ") + path, manifest);
}
catch (...)
{
@@ -202,6 +213,22 @@ public:
}
}
void loadLibrary(const std::string& path)
/// Loads a library from the given path. Does nothing
/// if the library is already loaded.
/// Throws a LibraryLoadException if the library
/// cannot be loaded or does not have a Manifest.
/// If the library exports a function named "pocoInitializeLibrary",
/// this function is executed.
/// If called multiple times for the same library,
/// the number of calls to unloadLibrary() must be the same
/// for the library to become unloaded.
///
/// Equivalent to loadLibrary(path, "").
{
loadLibrary(path, "");
}
void unloadLibrary(const std::string& path)
/// Unloads the given library.
/// Be extremely cautious when unloading shared libraries.