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// -*- mode: c++; c-basic-offset:4 -*-
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// This file is part of libdap, A C++ implementation of the OPeNDAP Data
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// Access Protocol.
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// Copyright (c) 2002,2003 OPeNDAP, Inc.
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// Author: James Gallagher <jgallagher@opendap.org>
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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 Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 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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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; 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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// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
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#ifndef http_cache_interrupt_handler_h
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#define http_cache_interrupt_handler_h
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#include <signal.h>
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#include <cassert>
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#include <iostream>
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#include <algorithm>
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#include "HTTPCache.h"
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#include "EventHandler.h"
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#include "debug.h"
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namespace libdap
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{
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static void
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unlink_file(const string &f)
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{
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unlink(f.c_str());
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}
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/** Handle SIGINT for HTTPCache. When the cache is in use and the process is
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sent SIGINT, we must make sure that the cache is left in a consistent
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state. This includes removing the lock file, updating the index file and
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making sure no partially written data or meta data files exist.
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@see EventHandler
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@see SignalHandler
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@see HTTPCache
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@author James Gallagher <jgallagher@opendap.org> */
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class HTTPCacheInterruptHandler : public EventHandler
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{
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private:
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public:
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///
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HTTPCacheInterruptHandler()
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{}
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///
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virtual ~HTTPCacheInterruptHandler()
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{}
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/** Handle SIGINT. This handler first deletes any files opened but not
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added to the cache index files and then calls
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HTTPCache::delete_instance().
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@param signum We know it is SIGINT; included here as a check and only
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when NDEBUG is not defined.
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@return Never returns. */
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virtual void handle_signal(int signum)
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{
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assert(signum == SIGINT);
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DBG(cerr << "Inside the HTTPCacheInterruptHandler." << endl);
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vector<string> *of = &HTTPCache::_instance->d_open_files;
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DBG(copy(of->begin(), of->end(),
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ostream_iterator<string>(cerr, "\n")));
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for_each(of->begin(), of->end(), unlink_file);
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HTTPCache::delete_instance();
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}
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};
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} // namespace libdap
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#endif // http_cache_interrupt_handler_h
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