From 5adde094541b74abf79a902dc4b63141d281b818 Mon Sep 17 00:00:00 2001
From: Regina Kleinhappel <regibabe@gmail.com>
Date: Mon, 14 May 2012 16:44:40 +0200
Subject: [PATCH] ...

---
 CMakeLists.txt  |   5 +-
 configcache.cpp | 187 ++++++++++++++++++++++++++++++++++++++++++++++++
 configcache.h   |  67 +++++++++++++++++
 3 files changed, 258 insertions(+), 1 deletion(-)
 create mode 100644 configcache.cpp
 create mode 100644 configcache.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ef5aae..117984c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,6 @@
 project(latlib)
 
-add_library(obs obs.cpp)
\ No newline at end of file
+add_library(obs obs.cpp)
+add_library(configcache configcache.cpp)
+
+target_link_libraries(configcache boost_iostreams)
\ No newline at end of file
diff --git a/configcache.cpp b/configcache.cpp
new file mode 100644
index 0000000..1c4aa05
--- /dev/null
+++ b/configcache.cpp
@@ -0,0 +1,187 @@
+#include "configcache.h"
+
+#include <stdlib.h>
+#include <iostream>
+#include <time.h>
+#include <dirent.h>
+#include <string.h>
+
+configcache::configcache(const string& cacheid, const int& nequi, const int& nskip, const string& datadir, char **configmem, const int& configMemSize){
+  NEQUI = nequi;
+  NSKIP = nskip;
+  DATADIR = datadir;
+  CACHEID = cacheid;
+
+  configMem = (char*)malloc(configMemSize);
+  tmpConfig = (char*)malloc(configMemSize);
+
+  *configmem = configMem;
+  configSize = configMemSize;
+
+  outBuffer = NULL;
+  inBuffer = NULL;
+
+  refetchDataFiles = false;
+}
+
+string configcache::getFileId(const bool& shortid)
+{
+  stringstream fileid;
+
+  if(!shortid) fileid << CACHEID << "_" << NEQUI << "_" << NSKIP;
+  for(int ipara=0; ipara<Paras.size(); ipara++)
+    fileid << "_" << Paras[ipara].id << Paras[ipara].val;
+
+  return fileid.str();
+}
+
+void configcache::fetchDataFiles()
+{
+  struct dirent *de=NULL;
+  DIR *d=NULL;
+  
+  d=opendir(DATADIR.c_str());
+  if(d != NULL){
+    while(de = readdir(d)){
+      string filename = de->d_name;
+      if(isValidInFile(filename)) 
+	{
+	  inFiles.push_back(filename);
+	}
+    }
+  }
+}
+
+bool configcache::isValidInFile(const string& infile)
+{
+  char *inchar, *inParts;
+  string truncIn, truncOut;
+
+  if( infile.size() < 4 ) return false;
+
+  if( infile.substr(infile.size()-3) != "dat" ) return false;
+
+  inchar = new char [infile.size()+1];
+  strcpy (inchar, infile.c_str());
+  
+  inParts = strtok( inchar, "_" );
+  for(int iPart=0; inParts!=NULL; iPart++)
+    {
+      if( iPart>3 ) { truncIn += "_"; truncIn += inParts; }
+
+      switch(iPart)
+	{
+	case 1: if(inParts != CACHEID) return false; break;
+	case 2: if(atoi(inParts) < NEQUI) return false; break;
+	case 3: if(atoi(inParts) < NSKIP) return false; break;
+	}
+      inParts = strtok( NULL, "_");
+    }
+  truncIn = truncIn.substr(0, truncIn.size()-4);
+
+  delete[] inchar;
+
+  if( truncIn.find( getFileId(true) ) == string::npos ) return false;
+
+  return true;
+}
+
+bool configcache::readConfig()
+{
+  if(DATADIR == "") return false;
+
+  if(refetchDataFiles){
+    refetchDataFiles = false;
+    fetchDataFiles();
+  }
+
+  while(true)
+    {
+      if( (!inFile.is_open()) && inFiles.size() == 0 ) return false;
+
+      while( (!inFile.is_open()) && inFiles.size() > 0 )
+	{
+	  inFile.open( (DATADIR + "/" + inFiles.back()).c_str(), std::ios::binary );
+	  inFiles.pop_back();
+
+	  if( !inFile.is_open() ) continue;
+
+	  inBuffer = new boost::iostreams::filtering_istreambuf;
+	  inBuffer->push( boost::iostreams::bzip2_decompressor() );
+	  inBuffer->push(inFile);
+	}
+
+      if( inFile.is_open() ) 
+	{
+	  if( boost::iostreams::read(*inBuffer, tmpConfig, configSize) == configSize )
+	    {
+	      memcpy(configMem, tmpConfig, configSize);
+	      return true;
+	    }
+	  else inFile.close();
+	}
+    }
+}
+
+void configcache::writeConfig()
+{
+  if( DATADIR == "") return;
+
+  if(!outFile.is_open()){
+    time_t secstamp = time(NULL);
+
+    outFileName.str("");
+    outFileName << DATADIR << "/" << secstamp << "_" << getFileId() << ".dat.tmp";    
+    outFile.open( outFileName.str().c_str(), std::ios::binary );
+
+    outBuffer = new boost::iostreams::filtering_ostreambuf;
+    outBuffer->push(boost::iostreams::bzip2_compressor());
+    outBuffer->push(outFile);
+  }
+
+  boost::iostreams::write(*outBuffer, configMem, configSize);
+}
+
+void configcache::addPara(const string& parid, const double& val){
+  parameter newPara;
+  newPara.id = parid;
+  newPara.val = val;
+  Paras.push_back(newPara);
+}
+
+int configcache::getParIndex(const string& parid){
+  for(int ipara=0; ipara<Paras.size(); ipara++)
+    if(Paras[ipara].id == parid) return ipara;
+}
+
+void configcache::setPara(const string& parid, const double& value){
+  Paras[getParIndex(parid)].val = value;
+  finishOutFile();
+  if(inBuffer != NULL) { delete inBuffer; inBuffer=NULL; } 
+  inFile.close();
+  inFiles.clear();
+
+  refetchDataFiles = true;
+}
+
+configcache::~configcache()
+{
+  finishOutFile();
+  delete inBuffer;
+  inBuffer = NULL;
+}
+
+void configcache::finishOutFile()
+{
+  if( outBuffer != NULL )
+    {
+      delete outBuffer;
+      outBuffer = NULL;
+    }
+
+  if( outFile.is_open() )
+    {
+      outFile.close();
+      rename( outFileName.str().c_str(), outFileName.str().substr(0, outFileName.str().size()-4).c_str() );
+    }
+}
diff --git a/configcache.h b/configcache.h
new file mode 100644
index 0000000..3227233
--- /dev/null
+++ b/configcache.h
@@ -0,0 +1,67 @@
+#ifndef CONFIGCACHE_H
+#define CONFIGCACHE_H
+
+#include <vector>
+#include <string>
+#include <fstream>
+#include <sstream>
+
+#include <boost/iostreams/filtering_streambuf.hpp>
+#include <boost/iostreams/stream.hpp>
+#include <boost/iostreams/filter/bzip2.hpp>
+#include <boost/iostreams/device/array.hpp>
+#include <boost/iostreams/copy.hpp>
+
+using namespace std;
+
+struct parameter{
+  string id;
+  double val;
+};
+
+class configcache{
+ public:
+  ~configcache();
+  configcache(const string& cacheid, const int& nequi, const int& nskip, const string& datadir, char **configmem, const int& configMemSize);
+  bool readConfig();
+  void writeConfig();
+  void addPara(const string& parid, const double& val=0);
+  void setPara(const string& parid, const double& value);
+  
+ private:
+  void finishOutFile();
+  int getParIndex(const string& parid);
+  int NEQUI;
+  int NSKIP;
+  string DATADIR;
+  string CACHEID;
+  string getFileId(const bool& shortid=false);
+
+  ofstream outFile;
+  ifstream inFile;
+
+  stringstream outFileName;
+
+  int readnum;
+
+  boost::iostreams::filtering_istreambuf *inBuffer;
+  boost::iostreams::filtering_ostreambuf *outBuffer;
+
+  int inSize;
+
+  int configSize;
+  char *configMem;
+  char *tmpConfig;
+
+  bool refetchDataFiles;
+
+  void fetchDataFiles();
+  
+  bool isValidInFile(const string& infile);
+
+  vector<string> inFiles;
+
+  vector<parameter> Paras;
+};
+
+#endif
-- 
2.39.5