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xalan objects freed up [introducing Pool::register_cleanup]

/** @file
	Parser: stylesheet fstylesheet decl.

	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)

	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)

	$Id: pa_stylesheet_connection.h,v 1.2 2001/09/15 11:48:41 parser Exp $
*/

#ifndef PA_STYLESHEET_CONNECTION_H
#define PA_STYLESHEET_CONNECTION_H

#include "pa_config_includes.h"
#include "pa_pool.h"
#include "pa_xslt_stylesheet_manager.h"
#include "pa_exception.h"
#include "pa_common.h"

#include <XalanTransformer/XalanTransformer.hpp>

// defines

#define STYLESHEET_FILENAME_STAMP_SUFFIX ".stamp"

/**	Connection with stylesheet: 
	remembers time and can figure out that it needs recompilation
*/
class Stylesheet_connection : public Pooled {

public:

	Stylesheet_connection(Pool& pool, const String& afile_spec) : Pooled(pool),
		ftransformer(new XalanTransformer),

		ffile_spec(afile_spec),
		time_used(0),
		prev_disk_time(0),
		fservices_pool(0) {
	}
	
	const String& file_spec() { return ffile_spec; }

	void set_services(Pool *aservices_pool) {
		time_used=time(0); // they started to use at this time
		fservices_pool=aservices_pool;
	}
	bool expired(time_t older_dies) {
		return time_used<older_dies;
	}

	void close() {
		XSLT_stylesheet_manager->close_connection(ffile_spec, *this);
	}

	void disconnect() { 
		/*ignore error*/ftransformer->destroyStylesheet(fstylesheet);  fstylesheet=0; 

		// connection effectively useless now, free up some memory
		delete ftransformer; 
	}

	bool connected() { return fstylesheet!=0; }

	XalanCompiledStylesheet& stylesheet() { 
		if(time_t new_disk_time=get_new_disk_time())
			load(new_disk_time);
		return *fstylesheet; 
	}

private:

	time_t get_new_disk_time() {
		time_t now_disk_time=get_disk_time();
		return now_disk_time>prev_disk_time?now_disk_time:0;
	}

	void load(time_t new_disk_time) {
		Pool& pool=*fservices_pool;

		int error=ftransformer->compileStylesheet(ffile_spec.cstr(String::UL_FILE_SPEC), fstylesheet);
		if(error)
			PTHROW(0, 0,
				&ffile_spec,
				ftransformer->getLastError());

		prev_disk_time=new_disk_time;
	}

	time_t get_disk_time() {
		size_t size;
		time_t atime, mtime, ctime;
		String stamp_file_spec(ffile_spec); 
		stamp_file_spec << STYLESHEET_FILENAME_STAMP_SUFFIX;
		// {file_spec}.stamp modification time OR {file_spec} mtime 
		if(!file_stat(file_readable(stamp_file_spec)?stamp_file_spec:ffile_spec, 
			size,
			atime, mtime, ctime,
			false/*no exceptions on global pool, please*/))
			mtime=0; // no file=no time
		return mtime;
	}

private:

	const String& ffile_spec;
	XalanCompiledStylesheet *fstylesheet;
	time_t time_used;
	time_t prev_disk_time;

private:

	XalanTransformer *ftransformer;

	Pool *fservices_pool;
};

#endif