Refactored httpd server integration, split http support and server logic in two modules. Added functions to load component implementations packaged as dynamic libraries. Minor monad code cleanup, converted cast operators to separate functions.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@883249 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 102 insertions, 0 deletions

diff --git a/sca-cpp/trunk/kernel/dynlib.hpp b/sca-cpp/trunk/kernel/dynlib.hpp
new file mode 100644
index 0000000000..10a5a030cb
--- /dev/null
+++ b/sca-cpp/trunk/kernel/dynlib.hpp
@@ -0,0 +1,102 @@
+/*
+ * 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 std::string dynlibExt(".dylib");
+#else
+const std::string dynlibExt(".so");
+#endif
+
+/**
+ * Represents a reference to a dynamic library.
+ */
+class lib {
+public:
+    lib() : dl(NULL) {
+    }
+
+    lib(const std::string& name) : dl(new DynLib(name)) {
+    }
+
+    ~lib() {
+    }
+
+private:
+    class DynLib {
+    public:
+        DynLib(const std::string& name) : name(name), h(dlopen(name.c_str(), RTLD_NOW)) {
+        }
+        ~DynLib() {
+            if (h == NULL)
+                return;
+            dlclose(h);
+        }
+
+        const std::string name;
+        void* h;
+    };
+
+    gc_ptr<DynLib> dl;
+
+    friend const failable<lib, std::string> dynlib(const std::string& name);
+    template<typename S> friend const failable<lambda<S>, std::string> dynlambda(const std::string& name, const lib& l);
+};
+
+/**
+ * Load a dynamic library.
+ */
+const failable<lib, std::string> dynlib(const std::string& name) {
+    const lib l(name);
+    if (l.dl->h == NULL)
+        return mkfailure<lib, std::string>("Could not load library: " + name + ": " + dlerror());
+    return l;
+}
+
+/**
+ * Find a lambda function in a dynamic library.
+ */
+template<typename S> const failable<lambda<S>, std::string> dynlambda(const std::string& name, const lib& l) {
+    const void* s = dlsym(l.dl->h, name.c_str());
+    if (s == NULL)
+        return mkfailure<lambda<S>, std::string>(std::string("Could not load symbol: " + name));
+    return lambda<S>((S*)s);
+}
+
+}
+#endif /* tuscany_dlib_hpp */