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Diffstat (limited to '')
-rw-r--r-- | sca-cpp/trunk/modules/server/mod-scm.hpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sca-cpp/trunk/modules/server/mod-scm.hpp b/sca-cpp/trunk/modules/server/mod-scm.hpp new file mode 100644 index 0000000000..386d032695 --- /dev/null +++ b/sca-cpp/trunk/modules/server/mod-scm.hpp @@ -0,0 +1,92 @@ +/* + * 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 */ |