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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_modcpp_hpp
#define tuscany_modcpp_hpp
/**
* Evaluation functions used by mod-eval to evaluate C++
* component implementations.
*/
#include "string.hpp"
#include "stream.hpp"
#include "function.hpp"
#include "list.hpp"
#include "element.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "dynlib.hpp"
#include "../scheme/driver.hpp"
namespace tuscany {
namespace server {
namespace modcpp {
/**
* Apply a C++ component implementation function.
*/
const list<value> failableResult(const value& func, const list<value>& v) {
if (isNil(cdr(v)))
return v;
// Report a failure with an empty reason as 'function not supported'
// Except for the start, and stop functions, which are optional
const value reason = cadr(v);
if (length(reason) == 0) {
if (func == "start" || func == "stop")
return mklist<value>(lambda<value(const list<value>&)>());
return mklist<value>(value(), string("Function not supported: ") + func);
}
return v;
}
struct applyImplementation {
const lib ilib;
const lambda<value(const list<value>&)> impl;
const list<value> px;
applyImplementation(const lib& ilib, const lambda<value(const list<value>&)>& impl, const list<value>& px) : ilib(ilib), impl(impl), px(px) {
}
const value operator()(const list<value>& params) const {
debug(params, "modeval::cpp::applyImplementation::input");
// Apply the component implementation function
const value val = failableResult(car(params), impl(append(params, px)));
debug(val, "modeval::cpp::applyImplementation::result");
return val;
}
};
/**
* Evaluate a C++ component implementation and convert it to
* an applicable lambda function.
*/
const failable<lambda<value(const list<value>&)> > evalImplementation(const string& path, const value& impl, const list<value>& px) {
// Configure the implementation's lambda function
const value ipath(attributeValue("path", impl));
const value iname(attributeValue("library", impl));
const string fpath(isNil(ipath)? path + iname : path + ipath + "/" + iname);
const lib ilib(*(new (gc_new<lib>()) lib(fpath + dynlibExt)));
const failable<lambda<value(const list<value>&)> > evalf(dynlambda<value(const list<value>&)>("apply", ilib));
if (!hasContent(evalf))
return evalf;
const lambda<value(const list<value>&)> l(applyImplementation(ilib, content(evalf), px));
return l;
}
}
}
}
#endif /* tuscany_modcpp_hpp */
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