dc15dc32bb
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1052740 13f79535-47bb-0310-9956-ffa450edef68
104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/* $Rev$ $Date$ */
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#ifndef tuscany_modcpp_hpp
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#define tuscany_modcpp_hpp
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/**
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* Evaluation functions used by mod-eval to evaluate C++
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* component implementations.
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*/
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#include "string.hpp"
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#include "stream.hpp"
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#include "function.hpp"
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#include "list.hpp"
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#include "element.hpp"
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#include "value.hpp"
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#include "monad.hpp"
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#include "dynlib.hpp"
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#include "../scheme/driver.hpp"
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namespace tuscany {
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namespace server {
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namespace modcpp {
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/**
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* Apply a C++ component implementation function.
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*/
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const list<value> failableResult(const value& func, const list<value>& v) {
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if (isNil(cdr(v)))
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return v;
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// Report a failure with an empty reason as 'function not supported'
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// Except for the start, and stop functions, which are optional
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const value reason = cadr(v);
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if (length(reason) == 0) {
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if (func == "start" || func == "stop")
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return mklist<value>(lambda<value(const list<value>&)>());
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return mklist<value>(value(), string("Function not supported: ") + func);
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}
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return v;
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}
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struct applyImplementation {
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const lib ilib;
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const lambda<value(const list<value>&)> impl;
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const list<value> px;
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applyImplementation(const lib& ilib, const lambda<value(const list<value>&)>& impl, const list<value>& px) : ilib(ilib), impl(impl), px(px) {
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}
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const value operator()(const list<value>& params) const {
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debug(params, "modeval::cpp::applyImplementation::input");
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// Apply the component implementation function
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const value val = failableResult(car(params), impl(append(params, px)));
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debug(val, "modeval::cpp::applyImplementation::result");
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return val;
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}
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};
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/**
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* Evaluate a C++ component implementation and convert it to
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* an applicable lambda function.
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*/
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const failable<lambda<value(const list<value>&)> > evalImplementation(const string& path, const value& impl, const list<value>& px) {
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// Configure the implementation's lambda function
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const value ipath(attributeValue("path", impl));
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const value iname(attributeValue("library", impl));
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const string fpath(isNil(ipath)? path + iname : path + ipath + "/" + iname);
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const lib ilib(*(new (gc_new<lib>()) lib(fpath + dynlibExt)));
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const failable<lambda<value(const list<value>&)> > evalf(dynlambda<value(const list<value>&)>("apply", ilib));
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if (!hasContent(evalf))
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return evalf;
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const lambda<value(const list<value>&)> l(applyImplementation(ilib, content(evalf), px));
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return l;
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}
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}
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}
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}
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#endif /* tuscany_modcpp_hpp */
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