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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_modscm_hpp
#define tuscany_modscm_hpp
/**
* Evaluation functions used by mod-eval to evaluate implementation.scheme
* component implementations.
*/
#include <string>
#include <iostream>
#include <fstream>
#include "function.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "cache.hpp"
#include "../eval/driver.hpp"
#include "../http/httpd.hpp"
#include "mod-eval.hpp"
namespace tuscany {
namespace server {
namespace modeval {
namespace scm {
/**
* Evaluate a script component implementation function.
*/
struct evalImplementation {
const value impl;
evalImplementation(const value& impl) : impl(impl) {
}
const failable<value, std::string> operator()(const value& func, const list<value>& params) const {
const value expr = cons<value>(func, eval::quotedParameters(params));
httpd::logValue(expr, "expr");
gc_pool pool;
eval::Env globalEnv = eval::setupEnvironment(pool);
const value val = eval::evalScript(expr, impl, globalEnv, pool);
httpd::logValue(val, "val");
if (isNil(val))
return mkfailure<value, std::string>("Could not evaluate expression");
return val;
}
};
/**
* Read a script component implementation.
*/
const failable<ilambda, std::string> readLatestImplementation(const std::string path) {
std::ifstream is(path.c_str(), std::ios_base::in);
if (is.fail() || is.bad())
return mkfailure<ilambda, std::string>("Could not read implementation: " + path);
const value impl = eval::readScript(is);
if (isNil(impl))
return mkfailure<ilambda, std::string>("Could not read implementation: " + path);
return ilambda(evalImplementation(impl));
}
const cached<failable<ilambda, std::string> > readImplementation(const std::string& path) {
const lambda<failable<ilambda, std::string>(std::string)> ri(readLatestImplementation);
const lambda<unsigned long(std::string)> ft(latestFileTime);
return cached<failable<ilambda, std::string> >(curry(ri, path), curry(ft, path));
}
}
}
}
}
#endif /* tuscany_modscm_hpp */
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