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/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2011 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#pragma once
#ifndef moses_OutputCollector_h
#define moses_OutputCollector_h
#ifdef WITH_THREADS
#include <boost/thread/mutex.hpp>
#endif
#ifdef BOOST_HAS_PTHREADS
#include <pthread.h>
#endif
#include <iostream>
#include <map>
#include <ostream>
#include <fstream>
#include <string>
#include "Util.h"
#include "util/exception.hh"
namespace Moses
{
/**
* Makes sure output goes in the correct order when multi-threading
**/
class OutputCollector
{
public:
OutputCollector(std::ostream* outStream= &std::cout,
std::ostream* debugStream=&std::cerr)
: m_nextOutput(0)
, m_outStream(outStream)
, m_debugStream(debugStream)
, m_isHoldingOutputStream(false)
, m_isHoldingDebugStream(false) {}
OutputCollector(std::string xout, std::string xerr = "")
: m_nextOutput(0) {
// TO DO open magic streams instead of regular ofstreams! [UG]
if (xout == "/dev/stderr") {
m_outStream = &std::cerr;
m_isHoldingOutputStream = false;
} else if (xout.size() && xout != "/dev/stdout" && xout != "-") {
m_outStream = new std::ofstream(xout.c_str());
UTIL_THROW_IF2(!m_outStream->good(), "Failed to open output file"
<< xout);
m_isHoldingOutputStream = true;
} else {
m_outStream = &std::cout;
m_isHoldingOutputStream = false;
}
if (xerr == "/dev/stdout") {
m_debugStream = &std::cout;
m_isHoldingDebugStream = false;
} else if (xerr.size() && xerr != "/dev/stderr") {
m_debugStream = new std::ofstream(xerr.c_str());
UTIL_THROW_IF2(!m_debugStream->good(), "Failed to open debug stream"
<< xerr);
m_isHoldingDebugStream = true;
} else {
m_debugStream = &std::cerr;
m_isHoldingDebugStream = false;
}
}
~OutputCollector() {
if (m_isHoldingOutputStream)
delete m_outStream;
if (m_isHoldingDebugStream)
delete m_debugStream;
}
void HoldOutputStream() {
m_isHoldingOutputStream = true;
}
void HoldDebugStream() {
m_isHoldingDebugStream = true;
}
bool OutputIsCout() const {
return (m_outStream == &std::cout);
}
/**
* Write or cache the output, as appropriate.
**/
void Write(int sourceId,const std::string& output,const std::string& debug="") {
#ifdef WITH_THREADS
boost::mutex::scoped_lock lock(m_mutex);
#endif
if (sourceId == m_nextOutput) {
//This is the one we were expecting
*m_outStream << output << std::flush;
*m_debugStream << debug << std::flush;
++m_nextOutput;
//see if there's any more
std::map<int,std::string>::iterator iter;
while ((iter = m_outputs.find(m_nextOutput)) != m_outputs.end()) {
*m_outStream << iter->second << std::flush;
++m_nextOutput;
std::map<int,std::string>::iterator debugIter = m_debugs.find(iter->first);
m_outputs.erase(iter);
if (debugIter != m_debugs.end()) {
*m_debugStream << debugIter->second << std::flush;
m_debugs.erase(debugIter);
}
}
} else {
//save for later
m_outputs[sourceId] = output;
m_debugs[sourceId] = debug;
}
}
private:
std::map<int,std::string> m_outputs;
std::map<int,std::string> m_debugs;
int m_nextOutput;
std::ostream* m_outStream;
std::ostream* m_debugStream;
bool m_isHoldingOutputStream;
bool m_isHoldingDebugStream;
#ifdef WITH_THREADS
boost::mutex m_mutex;
#endif
public:
void SetOutputStream(std::ostream* outStream) {
m_outStream = outStream;
}
};
} // namespace Moses
#endif
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