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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/* $Rev$ $Date$ */
+
+#ifndef tuscany_dlib_hpp
+#define tuscany_dlib_hpp
+
+/**
+ * Simple dynamic library access functions.
+ */
+
+#include <dlfcn.h>
+
+#include "function.hpp"
+#include "gc.hpp"
+#include "monad.hpp"
+
+namespace tuscany {
+
+/**
+ * OS specific dynamic library file extension.
+ */
+#ifdef IS_DARWIN
+const string dynlibExt(".dylib");
+#else
+const string dynlibExt(".so");
+#endif
+
+/**
+ * Represents a reference to a dynamic library.
+ */
+class lib {
+public:
+    lib() : h(NULL), owner(false) {
+    }
+
+    lib(const string& name) : name(name), h(dlopen(c_str(name), RTLD_NOW)), owner(true) {
+        if (h == NULL)
+            h = mkfailure<void*>(string("Could not load library: ") + name + ": " + dlerror());
+    }
+
+    lib(const lib& l) : name(l.name), h(l.h), owner(false) {
+    }
+
+    const lib& operator=(const lib& l) {
+        if(this == &l)
+            return *this;
+        name = l.name;
+        h = l.h;
+        owner = false;
+        return *this;
+    }
+
+    ~lib() {
+        if (!owner)
+            return;
+        if (!hasContent(h) || content(h) == NULL)
+            return;
+        dlclose(content(h));
+    }
+
+private:
+    template<typename S> friend const failable<lambda<S> > dynlambda(const string& name, const lib& l);
+
+    string name;
+    failable<void*> h;
+    bool owner;
+};
+
+/**
+ * Find a lambda function in a dynamic library.
+ */
+template<typename S> const failable<lambda<S> > dynlambda(const string& name, const lib& l) {
+    if (!hasContent(l.h))
+        return mkfailure<lambda<S>>(l.h);
+    const void* s = dlsym(content(l.h), c_str(name));
+    if (s == NULL)
+        return mkfailure<lambda<S> >(string("Could not load symbol: ") + name);
+    return lambda<S>((S*)s);
+}
+
+}
+#endif /* tuscany_dlib_hpp */