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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() : dl(NULL) {
}
lib(const string& name) : dl(new (gc_new<DynLib>()) DynLib(name)) {
}
~lib() {
}
private:
class DynLib {
public:
DynLib(const string& name) : name(name), h(dlopen(c_str(name), RTLD_NOW)) {
}
~DynLib() {
if (h == NULL)
return;
dlclose(h);
}
const string name;
void* h;
};
gc_ptr<DynLib> dl;
friend const failable<lib> dynlib(const string& name);
template<typename S> friend const failable<lambda<S> > dynlambda(const string& name, const lib& l);
};
/**
* Load a dynamic library.
*/
const failable<lib> dynlib(const string& name) {
const lib l(name);
if (l.dl->h == NULL)
return mkfailure<lib>(string("Could not load library: ") + name + ": " + dlerror());
return l;
}
/**
* Find a lambda function in a dynamic library.
*/
template<typename S> const failable<lambda<S> > dynlambda(const string& name, const lib& l) {
const void* s = dlsym(l.dl->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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