103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/** \file BufferedLogCallback.cxx
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* Buffer certain log messages permanently for later retrieval and display
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*/
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// Copyright (C) 2013 James Turner zakalawe@mac.com
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#include <simgear_config.h>
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#include <simgear/debug/BufferedLogCallback.hxx>
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#include <simgear/sg_inlines.h>
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#include <simgear/threads/SGThread.hxx>
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#include <cstdlib> // for malloc
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#include <cstring>
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#include <mutex>
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namespace simgear
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{
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class BufferedLogCallback::BufferedLogCallbackPrivate
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{
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public:
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std::mutex m_mutex;
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vector_cstring m_buffer;
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unsigned int m_stamp;
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unsigned int m_maxLength;
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};
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BufferedLogCallback::BufferedLogCallback(sgDebugClass c, sgDebugPriority p) :
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simgear::LogCallback(c,p),
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d(new BufferedLogCallbackPrivate)
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{
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d->m_stamp = 0;
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d->m_maxLength = 0xffff;
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}
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BufferedLogCallback::~BufferedLogCallback()
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{
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for (auto msg : d->m_buffer) {
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free(msg);
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}
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}
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void BufferedLogCallback::operator()(sgDebugClass c, sgDebugPriority p,
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const char* file, int line, const std::string& aMessage)
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{
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SG_UNUSED(file);
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SG_UNUSED(line);
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if (!shouldLog(c, p)) return;
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vector_cstring::value_type msg;
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if (aMessage.size() >= d->m_maxLength) {
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msg = (vector_cstring::value_type) malloc(d->m_maxLength);
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if (msg) {
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strncpy((char*) msg, aMessage.c_str(), d->m_maxLength - 1);
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msg[d->m_maxLength - 1] = 0; // add final NULL byte
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}
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} else {
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msg = (vector_cstring::value_type) strdup(aMessage.c_str());
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}
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std::lock_guard<std::mutex> g(d->m_mutex);
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d->m_buffer.push_back(msg);
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d->m_stamp++;
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}
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unsigned int BufferedLogCallback::stamp() const
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{
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return d->m_stamp;
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}
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unsigned int BufferedLogCallback::threadsafeCopy(vector_cstring& aOutput)
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{
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std::lock_guard<std::mutex> g(d->m_mutex);
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size_t sz = d->m_buffer.size();
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aOutput.resize(sz);
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memcpy(aOutput.data(), d->m_buffer.data(), sz * sizeof(vector_cstring::value_type));
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return d->m_stamp;
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}
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void BufferedLogCallback::truncateAt(unsigned int t)
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{
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d->m_maxLength = t;
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}
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} // of namespace simgear
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