repos_main/log4cproj_c/Log4C/layout.c

static const char version[] = "$Id$";

/*
* layout.c
*
* Copyright 2001-2003, Meiosys (www.meiosys.com). All rights reserved.
*
* See the COPYING file for the terms of usage and distribution.
*/

#include <log4c/layout.h>
#include <log4c/layout_type_basic.h>
#include <log4c/layout_type_dated.h>
#include <log4c/layout_type_dated_r.h>
#include <log4c/layout_type_dated_threadid.h>
#include <log4c/priority.h>
#include <sd/hash.h>
#include <sd/malloc.h>
#include <sd/factory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct __log4c_layout
{
	char*						lo_name;
	const log4c_layout_type_t*	lo_type;
	void*						lo_udata;
};

sd_factory_t* log4c_layout_factory = NULL;

//////////////////////////////////////////////////////////////////////////
///以下为jesse修改的代码，将原有代码用#if 0...#endif注释掉
// 为解决log4c_layout_types中内存泄漏而将静态局部变量提升为全局局部变量 [9/8/2008 jesse]
static sd_hash_t* layout_c_gs_types = NULL;

static sd_hash_t* log4c_layout_types(void)
{
	///static sd_hash_t* types = NULL;	
	if (!layout_c_gs_types)
		layout_c_gs_types = sd_hash_new(20, NULL);

	return layout_c_gs_types;
}

/** 删除本layout.c文件中定义的全局和静态的指针指向的内存,防止内存泄漏
如：
1.layout_c_gs_types.
2.
@return void.
作者：jesse 日期:2008.09.08
*/
extern void log4c_layout_delete_global()
{
	if (NULL != layout_c_gs_types)
	{
		sd_hash_delete(layout_c_gs_types);
		layout_c_gs_types = NULL;
	}
}

//////////////////////////////////////////////////////////////////////////

#if 0
/**
* @bug log4c_appender_type hash is not freed in destructor
*/

/*******************************************************************************/
static sd_hash_t* log4c_layout_types(void)
{
	static sd_hash_t* types = NULL;

	if (!types)
		types = sd_hash_new(20, NULL);

	return types;
}
#endif

extern void log4c_layout_types_print(FILE *fp)
{
	sd_hash_iter_t* i;

	fprintf(fp, "layout types:");
	for (i = sd_hash_begin(log4c_layout_types());
		i != sd_hash_end(log4c_layout_types()); 
		i = sd_hash_iter_next(i) ) 
	{
		fprintf(fp, "'%s' ",((log4c_layout_type_t *)(i->data))->name );
	}
	fprintf(fp, "\n");
}

/*******************************************************************************/
extern const log4c_layout_type_t* log4c_layout_type_get(const char* a_name)
{
	sd_hash_iter_t* i;

	if (!a_name)
		return NULL;

	if ( (i = (sd_hash_iter_t*)sd_hash_lookup(log4c_layout_types(), a_name)) != NULL)
		return (log4c_layout_type_t*)i->data;

	return NULL;
}

/*******************************************************************************/
extern const log4c_layout_type_t* log4c_layout_type_set(const log4c_layout_type_t* a_type)
{
	sd_hash_iter_t* i = NULL;
	void* previous = NULL;

	if (!a_type)
		return NULL;

	if ( (i = sd_hash_lookadd(log4c_layout_types(), a_type->name)) == NULL)
		return NULL;

	previous = i->data;
	i->data  = (void*) a_type;

	return (log4c_layout_type_t*)previous;
}
/*******************************************************************************/
extern log4c_layout_t* log4c_layout_get(const char* a_name)
{
	static const sd_factory_ops_t log4c_layout_factory_ops = {
		/*(void*) log4c_layout_new,
		(void*) log4c_layout_delete,
		(void*) log4c_layout_print,*/
		(void *( *)(const char *))log4c_layout_new,
		(void ( *)(void *))log4c_layout_delete,
		(void ( *)(void *,FILE *))log4c_layout_print
	};

	if (!log4c_layout_factory) {
		log4c_layout_factory = sd_factory_new("log4c_layout_factory", &log4c_layout_factory_ops);
		/* build default layouts */
		log4c_layout_set_type(log4c_layout_get("dated"), &log4c_layout_type_dated);
		log4c_layout_set_type(log4c_layout_get("basic"), &log4c_layout_type_basic);

		// 添加新的layouts [7/21/2010 jesse]
		log4c_layout_set_type(log4c_layout_get("dated_r"), &log4c_layout_type_dated_r);
		log4c_layout_set_type(log4c_layout_get("dated_threadid"), &log4c_layout_type_dated_threadid);
	}

	return (log4c_layout_t *)sd_factory_get(log4c_layout_factory, a_name);
}

/*******************************************************************************/
extern log4c_layout_t* log4c_layout_new(const char* a_name)
{
	log4c_layout_t* ptrThis;

	if (!a_name)
		return NULL;

	ptrThis	    = (log4c_layout_t*)sd_calloc(1, sizeof(log4c_layout_t));
	ptrThis->lo_name   = sd_strdup(a_name);
	ptrThis->lo_type   = &log4c_layout_type_basic;
	ptrThis->lo_udata  = NULL;

	return ptrThis;
}

/*******************************************************************************/
extern void log4c_layout_delete(log4c_layout_t* ptrThis)
{
	if (!ptrThis)
		return;

	free(ptrThis->lo_name);
	free(ptrThis);
}

/*******************************************************************************/
extern const char* log4c_layout_get_name(const log4c_layout_t* ptrThis)
{
	return (ptrThis ? ptrThis->lo_name : NULL);
}

/*******************************************************************************/
extern const log4c_layout_type_t* log4c_layout_get_type(const log4c_layout_t* ptrThis)
{
	return (ptrThis ? ptrThis->lo_type : NULL);
}

/*******************************************************************************/
extern const log4c_layout_type_t* log4c_layout_set_type(log4c_layout_t*		ptrThis, const log4c_layout_type_t*	a_type)
{
	const log4c_layout_type_t* previous;

	if (!ptrThis)
		return NULL;

	previous = ptrThis->lo_type;
	ptrThis->lo_type = a_type;
	return previous;
}

/*******************************************************************************/
extern void* log4c_layout_get_udata(const log4c_layout_t* ptrThis)
{
	return (ptrThis ? ptrThis->lo_udata : NULL);
}

/*******************************************************************************/
extern void* log4c_layout_set_udata(log4c_layout_t* ptrThis, void* a_udata)
{
	void* previous;

	if (!ptrThis)
		return NULL;

	previous = ptrThis->lo_udata;
	ptrThis->lo_udata = a_udata;
	return previous;
}

/*******************************************************************************/
extern const char* log4c_layout_format(const log4c_layout_t*		ptrThis, 
									   const log4c_logging_event_t*a_event)
{
	if (!ptrThis)
		return NULL;

	if (!ptrThis->lo_type)
		return NULL;

	if (!ptrThis->lo_type->format)
		return NULL;

	return ptrThis->lo_type->format(ptrThis, a_event);
}

/*******************************************************************************/
extern void log4c_layout_print(const log4c_layout_t* ptrThis, FILE* a_stream)
{
	if (!ptrThis) 
		return;

	fprintf(a_stream, "{ name:'%s' type:'%s' udata:%p }", 
		ptrThis->lo_name, 
		ptrThis->lo_type ? ptrThis->lo_type->name : "(no set)", 
		ptrThis->lo_udata);
}