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761 lines
22 KiB
C++
761 lines
22 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program 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
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GNU General Public License for more details.
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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,
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MA 02110-1301, USA. */
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#include "we_confirmhdfsdbfile.h"
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#include <cerrno>
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#include <cstring>
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#include <iostream>
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#include <sstream>
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#include <vector>
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#include <boost/scoped_array.hpp>
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#include <boost/scoped_ptr.hpp>
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#include "we_define.h"
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#include "we_config.h"
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#include "we_fileop.h"
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#include "we_rbmetawriter.h"
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#include "IDBPolicy.h"
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#include "IDBDataFile.h"
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namespace
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{
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const int BUF_SIZE = 1024; // size of buffer used to read meta data records
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}
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namespace WriteEngine
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{
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//------------------------------------------------------------------------------
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// Constructor
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// This class should typically only be used on an HDFS system, so we could
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// hardcode this to pass HDFS to getFsi(); but it comes in handy for testing,
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// to be able to execute this class on a non-HDFS stack as well. So I rely
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// on useHdfs() to tell me which FileSystem reference to get.
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//------------------------------------------------------------------------------
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ConfirmHdfsDbFile::ConfirmHdfsDbFile()
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: fFs(idbdatafile::IDBPolicy::useHdfs() ? idbdatafile::IDBFileSystem::getFs(idbdatafile::IDBDataFile::HDFS)
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: idbdatafile::IDBPolicy::useCloud()
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? idbdatafile::IDBFileSystem::getFs(idbdatafile::IDBDataFile::CLOUD)
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: idbdatafile::IDBFileSystem::getFs(idbdatafile::IDBDataFile::BUFFERED))
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{
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}
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//------------------------------------------------------------------------------
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// Destructor
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//------------------------------------------------------------------------------
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ConfirmHdfsDbFile::~ConfirmHdfsDbFile()
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{
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}
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//------------------------------------------------------------------------------
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// Backup a cdf file and replace it with the updated tmp file.
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//------------------------------------------------------------------------------
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int ConfirmHdfsDbFile::confirmDbFileChange(const std::string& backUpFileType, const std::string& filename,
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std::string& errMsg) const
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{
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// return value
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int rc = NO_ERROR;
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// This rlc file should be renamed if success, just skip it
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if (backUpFileType.compare("rlc") == 0)
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{
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return rc;
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}
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if (backUpFileType.compare("tmp") != 0)
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{
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std::ostringstream oss;
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oss << backUpFileType << " is a bad type to confirm DbFile change: " << filename;
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errMsg = oss.str();
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rc = ERR_HDFS_BACKUP;
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return rc;
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}
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// add safety checks, just in case
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std::string tmp(filename + ".tmp");
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if (!fFs.exists(tmp.c_str())) // file already swapped
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return rc;
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if (fFs.size(tmp.c_str()) <= 0)
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{
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std::ostringstream oss;
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oss << "tmp file " << tmp << " has bad size" << fFs.size(tmp.c_str());
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errMsg = oss.str();
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rc = ERR_COMP_RENAME_FILE;
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return rc;
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}
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// remove the old orig if exists
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std::string orig(filename + ".orig");
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errno = 0;
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if ((fFs.exists(orig.c_str())) && (fFs.remove(orig.c_str())) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "remove old " << orig << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_REMOVE_FILE;
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return rc;
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}
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// backup the original
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errno = 0;
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if (fFs.rename(filename.c_str(), orig.c_str()) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "rename " << filename << " to " << orig << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_RENAME_FILE;
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return rc;
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}
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// rename the new file
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errno = 0;
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if (fFs.rename(tmp.c_str(), filename.c_str()) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "rename " << tmp << " to " << filename << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_RENAME_FILE;
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return rc;
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}
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return rc;
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}
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//------------------------------------------------------------------------------
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// Finalize the changes to a db file.
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// If success flag is true, then remove the orig
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// otherwise, move the orig back to cdf
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//------------------------------------------------------------------------------
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int ConfirmHdfsDbFile::endDbFileChange(const std::string& backUpFileType, const std::string& filename,
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bool success, std::string& errMsg) const
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{
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// return value
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int rc = NO_ERROR;
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// This rlc file should be renamed if success, it is useless if failed.
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if (backUpFileType.compare("rlc") == 0)
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{
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std::string rlc(filename + ".rlc");
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if (fFs.exists(rlc.c_str()))
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fFs.remove(rlc.c_str()); // TBD-okay to ignore failed removal?
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return rc;
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}
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if (backUpFileType.compare("tmp") != 0)
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{
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std::ostringstream oss;
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oss << backUpFileType << " is a bad type to finalize DbFile change: " << filename;
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errMsg = oss.str();
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rc = ERR_HDFS_BACKUP;
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return rc;
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}
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std::string orig(filename + ".orig");
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if (success)
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{
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// remove the orig file
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errno = 0;
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if ((fFs.exists(orig.c_str())) && (fFs.remove(orig.c_str())) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "remove " << orig << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_REMOVE_FILE;
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return rc;
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}
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}
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else
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{
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// restore the orig file
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if (fFs.exists(orig.c_str()))
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{
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errno = 0;
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// Try to remove file only if it exists
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if ((fFs.exists(filename.c_str())) && (fFs.remove(filename.c_str()) != 0))
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "failed restore; remove " << filename << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_REMOVE_FILE;
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return rc;
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}
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errno = 0;
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if (fFs.rename(orig.c_str(), filename.c_str()) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "failed restore; rename " << orig << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_RENAME_FILE;
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return rc;
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}
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}
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// remove the tmp file
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std::string tmp(filename + ".tmp");
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errno = 0;
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if ((fFs.exists(tmp.c_str())) && (fFs.remove(tmp.c_str())) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "failed restore; remove " << tmp << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_REMOVE_FILE;
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return rc;
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}
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// remove the chunk shifting helper
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std::string rlc(filename + ".rlc");
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errno = 0;
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if ((fFs.exists(rlc.c_str())) && (fFs.remove(rlc.c_str())) != 0)
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{
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int errNum = errno;
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std::ostringstream oss;
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oss << "failed restore; remove " << rlc << " failed: " << strerror(errNum);
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errMsg = oss.str();
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rc = ERR_COMP_REMOVE_FILE;
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return rc;
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}
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}
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return rc;
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}
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//------------------------------------------------------------------------------
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// Confirm the changes to the hwm DB files listed in the bulk rollback meta
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// data file corresponding to the specified table OID.
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//------------------------------------------------------------------------------
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int ConfirmHdfsDbFile::confirmDbFileListFromMetaFile(OID tableOID, std::string& errMsg)
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{
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int rc = NO_ERROR;
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try
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{
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std::vector<uint16_t> dbRoots;
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Config::getRootIdList(dbRoots);
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for (unsigned m = 0; m < dbRoots.size(); m++)
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{
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std::istringstream metaDataStream;
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openMetaDataFile(tableOID, dbRoots[m], metaDataStream);
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confirmDbFiles(metaDataStream);
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}
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}
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catch (WeException& ex)
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{
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std::ostringstream oss;
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oss << "Error confirming changes to table " << tableOID << "; " << ex.what();
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errMsg = oss.str();
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rc = ex.errorCode();
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}
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catch (std::exception& ex)
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{
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std::ostringstream oss;
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oss << "Error confirming changes to table " << tableOID << "; " << ex.what();
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errMsg = oss.str();
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rc = ERR_UNKNOWN;
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}
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return rc;
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}
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//------------------------------------------------------------------------------
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// Confirm the changes to the hwm DB files listed in the bulk rollback meta
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// data file stream stored in metaDataStream.
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//------------------------------------------------------------------------------
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void ConfirmHdfsDbFile::confirmDbFiles(std::istringstream& metaDataStream) const
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{
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char inBuf[BUF_SIZE];
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// Loop through the records in the meta-data file
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while (metaDataStream.getline(inBuf, BUF_SIZE))
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{
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// Restore Files for current DBRoot
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if (RBMetaWriter::verifyColumn1Rec(inBuf))
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{
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confirmColumnDbFile(inBuf);
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}
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else if (RBMetaWriter::verifyDStore1Rec(inBuf))
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{
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confirmDctnryStoreDbFile(inBuf);
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}
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}
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}
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//------------------------------------------------------------------------------
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// Confirm the changes to the hwm column DB file described in the bulk
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// rollback meta data file record stored in inBuf.
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//------------------------------------------------------------------------------
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void ConfirmHdfsDbFile::confirmColumnDbFile(const char* inBuf) const
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{
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char recType[100];
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OID columnOID;
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uint32_t dbRootHwm;
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uint32_t partNumHwm;
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uint32_t segNumHwm;
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HWM lastLocalHwm;
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int colTypeInt;
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char colTypeName[100];
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uint32_t colWidth;
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int compressionType = 0; // optional parameter
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// Read meta-data record
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int numFields = sscanf(inBuf, "%s %u %u %u %u %u %d %s %u %d", recType, &columnOID, &dbRootHwm, &partNumHwm,
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&segNumHwm, &lastLocalHwm, &colTypeInt, colTypeName, &colWidth, &compressionType);
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if (numFields < 9) // compressionType is optional
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{
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std::ostringstream oss;
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oss << "Invalid COLUM1 record in meta-data file " << fMetaFileName << "; record-<" << inBuf << ">";
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throw WeException(oss.str(), ERR_INVALID_PARAM);
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}
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// Construct the DB file name
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char dbFileName[FILE_NAME_SIZE];
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FileOp dbFile(false);
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int rc = dbFile.getFileName(columnOID, dbFileName, dbRootHwm, partNumHwm, segNumHwm);
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if (rc != NO_ERROR)
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{
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WErrorCodes ec;
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std::ostringstream oss;
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oss << "Error constructing column filename to confirm changes"
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<< "; columnOID-" << columnOID << "; dbRoot-" << dbRootHwm << "; partNum-" << partNumHwm
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<< "; segNum-" << segNumHwm << "; " << ec.errorString(rc);
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throw WeException(oss.str(), rc);
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}
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// Confirm the changes to the DB file name
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std::string errMsg;
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rc = confirmDbFileChange(std::string("tmp"), dbFileName, errMsg);
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if (rc != NO_ERROR)
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{
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throw WeException(errMsg, rc);
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}
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}
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//------------------------------------------------------------------------------
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// Confirm the changes to the hwm dctnry store DB file described in the bulk
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// rollback meta data file record stored in inBuf.
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//------------------------------------------------------------------------------
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void ConfirmHdfsDbFile::confirmDctnryStoreDbFile(const char* inBuf) const
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{
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char recType[100];
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OID dColumnOID;
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OID dStoreOID;
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uint32_t dbRootHwm;
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uint32_t partNumHwm;
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uint32_t segNumHwm;
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HWM localHwm;
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int compressionType = 0; // optional parameter
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// Read meta-data record
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int numFields = sscanf(inBuf, "%s %u %u %u %u %u %u %d", recType, &dColumnOID, &dStoreOID, &dbRootHwm,
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&partNumHwm, &segNumHwm, &localHwm, &compressionType);
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if (numFields < 7) // compressionType optional
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{
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std::ostringstream oss;
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oss << "Invalid DSTOR1 record in meta-data file " << fMetaFileName << "; record-<" << inBuf << ">";
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throw WeException(oss.str(), ERR_INVALID_PARAM);
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}
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// Construct the DB file name
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char dbFileName[FILE_NAME_SIZE];
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FileOp dbFile(false);
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int rc = dbFile.getFileName(dStoreOID, dbFileName, dbRootHwm, partNumHwm, segNumHwm);
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if (rc != NO_ERROR)
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{
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WErrorCodes ec;
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std::ostringstream oss;
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oss << "Error constructing dictionary store filename to confirm changes"
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<< "; columnOID-" << dStoreOID << "; dbRoot-" << dbRootHwm << "; partNum-" << partNumHwm
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<< "; segNum-" << segNumHwm << "; " << ec.errorString(rc);
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throw WeException(oss.str(), rc);
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}
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// Confirm the changes to the DB file name
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std::string errMsg;
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rc = confirmDbFileChange(std::string("tmp"), dbFileName, errMsg);
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if (rc != NO_ERROR)
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{
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throw WeException(errMsg, rc);
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}
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}
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//------------------------------------------------------------------------------
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// End the changes to the hwm DB files listed in the bulk rollback meta
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// data file corresponding to the specified table OID. Delete temp files.
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//------------------------------------------------------------------------------
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int ConfirmHdfsDbFile::endDbFileListFromMetaFile(OID tableOID, bool success, std::string& errMsg)
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{
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int rc = NO_ERROR;
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errMsg.clear();
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std::vector<uint16_t> dbRoots;
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Config::getRootIdList(dbRoots);
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for (unsigned m = 0; m < dbRoots.size(); m++)
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{
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std::istringstream metaDataStream;
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try
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{
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std::istringstream metaDataStream;
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openMetaDataFile(tableOID, dbRoots[m], metaDataStream);
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endDbFiles(metaDataStream, success);
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}
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// We catch any errors, but not deleting a temp file is not fatal,
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// so we capture the error msg and keep going if a problem occurs.
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// We return a concatenated list of error msgs if multiple errors
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// take place.
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catch (WeException& ex)
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{
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if (errMsg.size() == 0)
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{
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std::ostringstream oss;
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oss << "Error deleting temp files for table " << tableOID << "; " << ex.what();
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errMsg = oss.str();
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rc = ex.errorCode();
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}
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else
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{
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errMsg += "; ";
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errMsg += ex.what();
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}
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}
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catch (std::exception& ex)
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{
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if (errMsg.size() == 0)
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{
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std::ostringstream oss;
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oss << "Error deleting temp files for table " << tableOID << "; " << ex.what();
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errMsg = oss.str();
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rc = ERR_UNKNOWN;
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}
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else
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{
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errMsg += "; ";
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errMsg += ex.what();
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}
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}
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}
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return rc;
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}
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//------------------------------------------------------------------------------
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// End the changes to the hwm DB files listed in the bulk rollback meta
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// data file stream stored in metaDataStream. Delete temp files.
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//------------------------------------------------------------------------------
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void ConfirmHdfsDbFile::endDbFiles(std::istringstream& metaDataStream, bool success) const
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{
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char inBuf[BUF_SIZE];
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std::string errMsg;
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int rc = NO_ERROR;
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// Loop through the records in the meta-data file
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while (metaDataStream.getline(inBuf, BUF_SIZE))
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{
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try
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{
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// Delete Temp Files for current DBRoot
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if (RBMetaWriter::verifyColumn1Rec(inBuf))
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{
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endColumnDbFile(inBuf, success);
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}
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else if (RBMetaWriter::verifyDStore1Rec(inBuf))
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{
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endDctnryStoreDbFile(inBuf, success);
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}
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}
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// We catch any errors, but not deleting a temp file is not fatal,
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// so we capture the error msg and keep going if a problem occurs.
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// We return a concatenated list of error msgs if multiple errors
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// take place.
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catch (WeException& ex)
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{
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if (errMsg.size() == 0)
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{
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rc = ex.errorCode();
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}
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else
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{
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errMsg += "; ";
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}
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errMsg += ex.what();
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}
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catch (std::exception& ex)
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{
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if (errMsg.size() == 0)
|
|
{
|
|
rc = ERR_UNKNOWN;
|
|
}
|
|
else
|
|
{
|
|
errMsg += "; ";
|
|
}
|
|
|
|
errMsg += ex.what();
|
|
}
|
|
}
|
|
|
|
// Throw exception with cumulative list of any error msgs
|
|
if (errMsg.size() > 0)
|
|
{
|
|
throw WeException(errMsg, rc);
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// End the changes to the hwm column DB file described in the bulk
|
|
// rollback meta data file record stored in inBuf. Delete the temp file.
|
|
//------------------------------------------------------------------------------
|
|
void ConfirmHdfsDbFile::endColumnDbFile(const char* inBuf, bool success) const
|
|
{
|
|
char recType[100];
|
|
OID columnOID;
|
|
uint32_t dbRootHwm;
|
|
uint32_t partNumHwm;
|
|
uint32_t segNumHwm;
|
|
HWM lastLocalHwm;
|
|
int colTypeInt;
|
|
char colTypeName[100];
|
|
uint32_t colWidth;
|
|
int compressionType = 0; // optional parameter
|
|
|
|
// Read meta-data record
|
|
int numFields = sscanf(inBuf, "%s %u %u %u %u %u %d %s %u %d", recType, &columnOID, &dbRootHwm, &partNumHwm,
|
|
&segNumHwm, &lastLocalHwm, &colTypeInt, colTypeName, &colWidth, &compressionType);
|
|
|
|
if (numFields < 9) // compressionType is optional
|
|
{
|
|
std::ostringstream oss;
|
|
oss << "Invalid COLUM1 record in meta-data file " << fMetaFileName << "; record-<" << inBuf << ">";
|
|
|
|
throw WeException(oss.str(), ERR_INVALID_PARAM);
|
|
}
|
|
|
|
// Construct the DB file name
|
|
char dbFileName[FILE_NAME_SIZE];
|
|
FileOp dbFile(false);
|
|
int rc = dbFile.getFileName(columnOID, dbFileName, dbRootHwm, partNumHwm, segNumHwm);
|
|
|
|
if (rc != NO_ERROR)
|
|
{
|
|
WErrorCodes ec;
|
|
std::ostringstream oss;
|
|
oss << "Error constructing column filename to end changes"
|
|
<< "; columnOID-" << columnOID << "; dbRoot-" << dbRootHwm << "; partNum-" << partNumHwm
|
|
<< "; segNum-" << segNumHwm << "; " << ec.errorString(rc);
|
|
|
|
throw WeException(oss.str(), rc);
|
|
}
|
|
|
|
// Confirm the changes to the DB file name
|
|
std::string errMsg;
|
|
rc = endDbFileChange(std::string("tmp"), dbFileName, success, errMsg);
|
|
|
|
if (rc != NO_ERROR)
|
|
{
|
|
throw WeException(errMsg, rc);
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// End the changes to the hwm dctnry store DB file described in the bulk
|
|
// rollback meta data file record stored in inBuf. Delete the temp file.
|
|
//------------------------------------------------------------------------------
|
|
void ConfirmHdfsDbFile::endDctnryStoreDbFile(const char* inBuf, bool success) const
|
|
{
|
|
char recType[100];
|
|
OID dColumnOID;
|
|
OID dStoreOID;
|
|
uint32_t dbRootHwm;
|
|
uint32_t partNumHwm;
|
|
uint32_t segNumHwm;
|
|
HWM localHwm;
|
|
int compressionType = 0; // optional parameter
|
|
|
|
// Read meta-data record
|
|
int numFields = sscanf(inBuf, "%s %u %u %u %u %u %u %d", recType, &dColumnOID, &dStoreOID, &dbRootHwm,
|
|
&partNumHwm, &segNumHwm, &localHwm, &compressionType);
|
|
|
|
if (numFields < 7) // compressionType optional
|
|
{
|
|
std::ostringstream oss;
|
|
oss << "Invalid DSTOR1 record in meta-data file " << fMetaFileName << "; record-<" << inBuf << ">";
|
|
|
|
throw WeException(oss.str(), ERR_INVALID_PARAM);
|
|
}
|
|
|
|
// Construct the DB file name
|
|
char dbFileName[FILE_NAME_SIZE];
|
|
FileOp dbFile(false);
|
|
int rc = dbFile.getFileName(dStoreOID, dbFileName, dbRootHwm, partNumHwm, segNumHwm);
|
|
|
|
if (rc != NO_ERROR)
|
|
{
|
|
WErrorCodes ec;
|
|
std::ostringstream oss;
|
|
oss << "Error constructing dictionary store filename to end changes"
|
|
<< "; columnOID-" << dStoreOID << "; dbRoot-" << dbRootHwm << "; partNum-" << partNumHwm
|
|
<< "; segNum-" << segNumHwm << "; " << ec.errorString(rc);
|
|
|
|
throw WeException(oss.str(), rc);
|
|
}
|
|
|
|
// Confirm the changes to the DB file name
|
|
std::string errMsg;
|
|
rc = endDbFileChange(std::string("tmp"), dbFileName, success, errMsg);
|
|
|
|
if (rc != NO_ERROR)
|
|
{
|
|
throw WeException(errMsg, rc);
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Open and read the bulk rollback metadata file for the specified table OID
|
|
// and DBRoot. The contents of the metadata file is returned in the meta-
|
|
// DataStream argument.
|
|
//------------------------------------------------------------------------------
|
|
void ConfirmHdfsDbFile::openMetaDataFile(OID tableOID, uint16_t dbRoot, std::istringstream& metaDataStream)
|
|
{
|
|
std::string bulkRollbackPath(Config::getDBRootByNum(dbRoot));
|
|
|
|
// Construct file name and check for it's existence
|
|
std::ostringstream ossFileName;
|
|
ossFileName << '/' << DBROOT_BULK_ROLLBACK_SUBDIR << '/' << tableOID;
|
|
fMetaFileName = bulkRollbackPath;
|
|
fMetaFileName += ossFileName.str();
|
|
|
|
// Return if the meta-data file does not exist.
|
|
if (!fFs.exists(fMetaFileName.c_str()))
|
|
{
|
|
std::ostringstream oss;
|
|
oss << "Bulk rollback meta-data file " << fMetaFileName << " does not exist.";
|
|
|
|
throw WeException(oss.str(), ERR_FILE_NOT_EXIST);
|
|
}
|
|
|
|
// Open the file
|
|
boost::scoped_ptr<IDBDataFile> metaFile;
|
|
errno = 0;
|
|
metaFile.reset(idbdatafile::IDBDataFile::open(
|
|
idbdatafile::IDBPolicy::getType(fMetaFileName.c_str(), idbdatafile::IDBPolicy::WRITEENG),
|
|
fMetaFileName.c_str(), "rb", 0));
|
|
|
|
if (!metaFile)
|
|
{
|
|
int errRc = errno;
|
|
std::ostringstream oss;
|
|
oss << "Error opening bulk rollback meta-data file " << fMetaFileName << "; err-" << errRc << "; "
|
|
<< strerror(errRc);
|
|
|
|
throw WeException(oss.str(), ERR_FILE_OPEN);
|
|
}
|
|
|
|
// First record in the file must be a Version record.
|
|
char inBuf[BUF_SIZE];
|
|
ssize_t metaFileSize = fFs.size(fMetaFileName.c_str());
|
|
boost::scoped_array<char> buf(new char[metaFileSize]);
|
|
// retry 10 times for partial reads, just in case
|
|
ssize_t readSofar = 0; // bytes read so far
|
|
ssize_t bytes = 0; // bytes read by one pread
|
|
char* p = buf.get();
|
|
|
|
for (int i = 0; i < 10 && readSofar < metaFileSize; i++)
|
|
{
|
|
errno = 0;
|
|
bytes = metaFile->pread(p + readSofar, readSofar, metaFileSize - readSofar);
|
|
|
|
if (bytes < 0)
|
|
break;
|
|
|
|
readSofar += bytes;
|
|
}
|
|
|
|
if (readSofar != metaFileSize)
|
|
{
|
|
int errRc = errno;
|
|
std::ostringstream oss;
|
|
oss << "Error reading bulk rollback meta-data file " << fMetaFileName << "; read/expect:" << readSofar
|
|
<< "/" << metaFileSize << "; err-" << errRc << "; " << strerror(errRc);
|
|
|
|
throw WeException(oss.str(), ERR_FILE_READ);
|
|
}
|
|
|
|
// put the data in a string stream
|
|
metaDataStream.str(std::string(p, metaFileSize));
|
|
buf.reset();
|
|
|
|
// read data
|
|
metaDataStream.getline(inBuf, BUF_SIZE);
|
|
|
|
if (!RBMetaWriter::verifyVersion4(inBuf))
|
|
{
|
|
std::ostringstream oss;
|
|
oss << "Invalid version record in meta-data file " << fMetaFileName << "; record-<" << inBuf << ">";
|
|
|
|
throw WeException(oss.str(), ERR_INVALID_PARAM);
|
|
}
|
|
}
|
|
|
|
} // namespace WriteEngine
|