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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:
inline lib() : h(NULL), owner(false) {
}
inline lib(const string& name) : name(name), h(open(name)), owner(true) {
}
inline lib(const lib& l) : name(l.name), h(l.h), owner(false) {
}
lib& operator=(const lib& l) = delete;
inline ~lib() {
if (!owner)
return;
if (!hasContent(h) || content(h) == NULL)
return;
dlclose(content(h));
}
private:
const failable<void*> open(const string& name) {
void * h = dlopen(c_str(name), RTLD_NOW);
return h != NULL? failable<void*>(h) : mkfailure<void*>(string("Could not load library: ") + name + ": " + dlerror());
}
template<typename S> friend const failable<lambda<S> > dynlambda(const string& name, const lib& l);
const string name;
const failable<void*> h;
const bool owner;
};
/**
* Find a lambda function in a dynamic library.
*/
template<typename S> inline 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 */
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