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README
LGPL-2.1
fasterjson - 最快的JSON解析器

1.概述
2.编译安装
3.基本使用
4.性能
5.最后

------------------------------------------------------------

1.概述

fasterjson是一个快速SAX模式的JSON解析器。它直接解析JSON文本,调用注册的事件函数,快速访问JSON中感兴趣的内容。
fasterjson主要用于只读方式挖掘JSON数据到应用对象中,如JSON配置文件解析、大型JSON报文解包。因为它不像DOM模式需要先构造一个完整的文档树,所以速度非常快,几乎接近strlen的性能。
fasterjson非常小巧,整个源代码由一对fasterjson.h,fasterjson.c组成,700行,18KB,不依赖于任何其它库,容易嵌入到您的项目中。

2.编译安装

以Linux操作系统为例,每个目录里的构造脚本均是makefile.Linux,外层目录makefile.Linux递归下级子目录
[code]
$ cd src
$ make -f makefile.Linux install
gcc -g -fPIC -O2 -Wall -Werror -fno-strict-aliasing -I.  -c fasterjson.c
gcc -g -fPIC -O2 -Wall -Werror -fno-strict-aliasing -o libfasterjson.so fasterjson.o -shared -L.
cp -f libfasterjson.so $HOME/lib/
cp -f fasterjson.h $HOME/include/fasterjson/
[/code]

3.基本使用

fasterjson使用接口函数只有三个,下面依次说明之

[code]
typedef int funcCallbackOnJsonNode( int type , char *jpath , int jpath_len , int jpath_size , char *node , int node_len , char *content , int content_len , void *p );
int TravelJsonBuffer( char *json_buffer , char *jpath , int jpath_size
		, funcCallbackOnJsonNode *pfuncCallbackOnJsonNode
		, void *p );
int TravelJsonBuffer4( char *json_buffer , char *jpath , int jpath_size
		, funcCallbackOnJsonNode *pfuncCallbackOnEnterJsonBranch
		, funcCallbackOnJsonNode *pfuncCallbackOnLeaveJsonBranch
		, funcCallbackOnJsonNode *pfuncCallbackOnEnterJsonArray
		, funcCallbackOnJsonNode *pfuncCallbackOnLeaveJsonArray
		, funcCallbackOnJsonNode *pfuncCallbackOnJsonLeaf
		, void *p );
[/code]
函数TravelJsonBuffer读入JSON文本并快速解析之,当遇到JSON树枝或JSON树叶时调用pfuncCallbackOnJsonNode呼叫应用访问,应用可根据type确定读到了树枝事件或树叶事件等,以及jpath,筛选访问感兴趣的JSON节点。
函数TravelJsonBuffer4是TravelJsonBuffer事件细分版本。

下面是一个简单的示例
[code]
funcCallbackOnJsonNode CallbackOnJsonNode ;
int CallbackOnJsonNode( int type , char *jpath , int jpath_len , int jpath_size , char *nodename , int nodename_len , char *content , int content_len , void *p )
{
	if( type & FASTERJSON_NODE_BRANCH )
	{
		if( type & FASTERJSON_NODE_ENTER )
		{
			printf( "ENTER-BRANCH p[%s] jpath[%.*s] nodename[%.*s]\n" , (char*)p , jpath_len , jpath , nodename_len , nodename );
		}
		else if( type & FASTERJSON_NODE_LEAVE )
		{
			printf( "LEAVE-BRANCH p[%s] jpath[%.*s] nodename[%.*s]\n" , (char*)p , jpath_len , jpath , nodename_len , nodename );
		}
	}
	else if( type & FASTERJSON_NODE_ARRAY )
	{
		if( type & FASTERJSON_NODE_ENTER )
		{
			printf( "ENTER-ARRAY  p[%s] jpath[%.*s] nodename[%.*s]\n" , (char*)p , jpath_len , jpath , nodename_len , nodename );
		}
		else if( type & FASTERJSON_NODE_LEAVE )
		{
			printf( "LEAVE-ARRAY  p[%s] jpath[%.*s] nodename[%.*s]\n" , (char*)p , jpath_len , jpath , nodename_len , nodename );
		}
	}
	else if( type & FASTERJSON_NODE_LEAF )
	{
		printf( "LEAF         p[%s] jpath[%.*s] nodename[%.*s] content[%.*s]\n" , (char*)p , jpath_len , jpath , nodename_len , nodename , content_len , content );
	}
	
	return 0;
}

...
char	jpath[ 1024 + 1 ] ;
char	*json_buffer = NULL ;
char	*p = "hello world" ;

memset( jpath , 0x00 , sizeof(jpath) );
nret = TravelJsonBuffer( json_buffer , jpath , sizeof(jpath) , & CallbackOnJsonNode , p ) ;
free( json_buffer );
if( nret && nret != FASTJSON_INFO_END_OF_BUFFER )
{
	printf( "TravelJsonTree failed[%d]\n" , nret );
	return nret;
}
...
[/code]

执行之,输出为
[code]
$ cat test_basic.json
{
       root :
       {
               leaf : content ,
               sub_branch:
               {
                       sub_leaf:sub_content ,
                       "sub_leaf 2":"sub_content 2"
               }
       } ,
       "root2" : "leaf2"
}
$ ./test_fasterjson test_basic.json
ENTER-BRANCH p[hello world] jpath[/root] nodename[root]
LEAF         p[hello world] jpath[/root/leaf] nodename[leaf] content[content]
ENTER-BRANCH p[hello world] jpath[/root/sub_branch] nodename[sub_branch]
LEAF         p[hello world] jpath[/root/sub_branch/sub_leaf] nodename[sub_leaf] content[sub_content]
LEAF         p[hello world] jpath[/root/sub_branch/sub_leaf 2] nodename[sub_leaf 2] content[sub_content 2]
LEAVE-BRANCH p[hello world] jpath[/root/sub_branch] nodename[sub_branch]
LEAVE-BRANCH p[hello world] jpath[/root] nodename[root]
LEAF         p[hello world] jpath[/root2] nodename[root2] content[leaf2]
[/code]

客户可以改造事件回调函数,实现快速遍历访问JSON,比如根据JSON某些JPATH数据填充一个C结构体相关成员。

对于多字节字,可设置全局变量g_fasterjson_encoding以支持对应编码,目前取值有FASTERJSON_ENCODING_UTF8和FASTERJSON_ENCODING_GB18030,默认为UTF8。
如:g_fasterjson_encoding = FASTERJSON_ENCODING_GB18030 ;

4.性能

fasterjson的性能非常高,下面是fasterjson与目前宣称最快JSON解析器rapidjson的压测比较
压测用JSON文件test_big_and_lang.json约622KB(17870行),里面包含大量节点、重复节点、各种编码以及少量注释。
[code]
~/exsrc/fasterjson-1.0.0/test $ ls -l test_big_and_lang.json
-rw-r--r-- 1 calvin calvin 622511 Sep 21 10:51 test_big_and_lang.json
~/exsrc/fasterjson-1.0.0/test $ wc test_big_and_lang.json
17870  26332 622511 test_big_and_lang.json
[/code]

首先是fasterjson开跑10次,取最好成绩
[code]
~/exsrc/fasterjson-1.0.0/test $ time ./press_fasterjson test_big.json 1000000
Elapse 3 seconds

real    0m3.445s
user    0m3.401s
sys     0m0.010s
[/code]
遍历测试JSON文件所有树枝、树叶1000000次,耗时约3秒。

然后是rapidjson开跑10次,取最好成绩
[code]
~/exsrc/fasterjson-1.0.0/test_rapidjson $ time ./press_rapidjson ../test/test_big.json 1000000
Elapse 10 seconds

real    0m9.733s
user    0m9.623s
sys     0m0.017s
[/code]
遍历测试JSON文件所有树枝、树叶1000000次,耗时约10秒。

可见fasterjson比rapidjson快了约3倍,fasterjson夺取了JSON(SAX)性能桂冠。

5.最后

欢迎使用fasterjson,如果你使用中碰到了问题请告诉我,谢谢 ^_^
首页传送门 : [url]http://git.oschina.net/calvinwilliams/fasterjson[/url]
作者邮箱   : calvinwilliams.c@gmail.com
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You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add information on how to contact you by electronic and paper mail. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the library, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the library `Frob' (a library for tweaking knobs) written by James Random Hacker. {signature of Ty Coon}, 1 April 1990 Ty Coon, President of Vice That's all there is to it!

简介

fasterjson是一个SAX模式的JSON解析器。它直接解析JSON文本,调用注册的事件函数,快速访问JSON中感兴趣的内容。 展开 收起
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