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Windows fixes
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Jack Andersen
174
gmm/gmm_feedback_management.h
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174
gmm/gmm_feedback_management.h
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/* -*- c++ -*- (enables emacs c++ mode) */
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/*===========================================================================
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Copyright (C) 2002-2017 Yves Renard
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This file is a part of GetFEM++
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GetFEM++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version along with the GCC Runtime Library
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Exception either version 3.1 or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License and GCC Runtime Library Exception for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, you may use this file as it is a part of a free
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software library without restriction. Specifically, if other files
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instantiate templates or use macros or inline functions from this file,
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or you compile this file and link it with other files to produce an
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executable, this file does not by itself cause the resulting executable
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to be covered by the GNU Lesser General Public License. This exception
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does not however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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===========================================================================*/
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/** @file gmm_feedback_management.h
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@date July 03, 2017.
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@brief Support for run time management of trace, warning and assert
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feedback.
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*/
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#ifndef GMM_FEEDBACK_MANAGEMENT_H__
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#define GMM_FEEDBACK_MANAGEMENT_H__
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#include <iostream>
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#include <string>
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#include <memory>
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namespace gmm {
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/* *********************************************************************** */
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/* GetFEM++ warnings. */
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/* *********************************************************************** */
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// This allows to dynamically hide warnings
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struct warning_level {
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static int level(int l = -2)
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{ static int level_ = 3; return (l != -2) ? (level_ = l) : level_; }
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};
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inline void set_warning_level(int l) { warning_level::level(l>0 ? l : 0); }
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inline int get_warning_level(void) { return warning_level::level(-2); }
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/* *********************************************************************** */
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/* GetFEM++ traces. */
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/* *********************************************************************** */
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// This allows to dynamically hide traces
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struct traces_level {
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static int level(int l = -2)
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{ static int level_ = 3; return (l != -2) ? (level_ = l) : level_; }
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};
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inline void set_traces_level(int l) { traces_level::level(l>0 ? l : 0); }
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inline int get_traces_level(void) { return traces_level::level(); }
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/* *********************************************************************** */
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/* GetFEM++ feedback management */
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/* *********************************************************************** */
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enum class FeedbackType {
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TRACE = 0,
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WARNING,
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ASSERT
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};
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// Abstract class providing feedback management interface.
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// The interface consist of three functions:
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// * for sending feedback message
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// * for getting traces level
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// * for getting warning level
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// * for action to be done after feedback is handled
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struct base_feedback_handler {
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virtual ~base_feedback_handler() = default;
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virtual void send(const std::string &message, FeedbackType messageType, size_t level) = 0;
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virtual size_t traces_level() { return get_traces_level(); }
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virtual size_t warning_level() { return get_warning_level(); }
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virtual void terminating_action() = 0;
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};
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// Provides the default implementation of feedback handling.
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struct default_feedback_handler final : public base_feedback_handler {
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void send(const std::string &message, FeedbackType, size_t) override {
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std::cerr << message << std::endl;
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}
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void terminating_action() override {
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std::exit(1);
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}
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};
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// This class acts as a run-time dispatcher for sending feedback
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// messages and getting trace and warning levels.
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class feedback_manager {
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public:
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// Management actions
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enum Action {
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SET, // Sets the feedback handler, releasing the one previously set.
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GET, // Returns currently managed handler (it is still managed).
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REPLACE, // Replace manager with a new one, stop managing the old one
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// and returns it unmanaged to the caller. The caller is
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// then responsible for managing the memory of the handler.
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};
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// Steals the pointer to a messenger object that provides
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// feedback handling implementation.
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//
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// Example:
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// feedback_manager::manage(new default_feedback_handler);
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//
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static base_feedback_handler* manage(enum Action action=GET, base_feedback_handler *pHandler=nullptr);
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static void send(const std::string &message, FeedbackType type, size_t level);
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static size_t traces_level();
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static size_t warning_level();
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// Action to be taken when feedback handling is done
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static void terminating_action();
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};
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// Depending on action either gets, sets or replaces feedback handler. Setting handler to null resets
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// it to gmm::default_feedback_handler.
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inline base_feedback_handler* feedback_manager::manage(enum Action action, base_feedback_handler *pHandler) {
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static std::unique_ptr<base_feedback_handler> pHandler_ =
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std::move(std::unique_ptr<base_feedback_handler>(new default_feedback_handler));
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base_feedback_handler *rethandler = nullptr;
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switch(action) {
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case SET:
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pHandler_.reset(pHandler != nullptr ? pHandler : new default_feedback_handler);
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rethandler = pHandler_.get();
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break;
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case GET:
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rethandler = pHandler_.get();
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break;
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case REPLACE:
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rethandler = pHandler_.release();
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pHandler_.reset(pHandler != nullptr ? pHandler : new default_feedback_handler);
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break;
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}
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return rethandler;
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}
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inline void feedback_manager::send(const std::string &message, FeedbackType type, size_t level) {
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feedback_manager::manage()->send(message, type, level);
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}
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inline void feedback_manager::terminating_action() {
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feedback_manager::manage()->terminating_action();
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}
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inline size_t feedback_manager::traces_level() {
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return feedback_manager::manage()->traces_level();
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}
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inline size_t feedback_manager::warning_level() {
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return feedback_manager::manage()->warning_level();
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}
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} // namespace gmm
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#endif /* GMM_FEEDBACK_MANAGEMENT_H__ */
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