zookeeper C API实例
之前一直用zookeeper的java API，最近要用C开发，所以看了C的API及实现使用zookeeper C API 的步骤：
（1）安装zookeeper，直接下载，解压，配置文件即可
（2）安装C API
进入./zookeeper/src/c目录
./configure
make
make install
（3）编写调用函数，可以参考下面的例子
（4）编译的时候注意引入所在的头文件和动态库，默认安装时头文件在/usr/local/include/c-client-src中，动态库在/usr/local/lib中，使用多线程时注意-DTHREAD
具体的编译:gcc a.c -DTHREAD -I/usr/local/include/c-client-src/usr/local/lib/libzookeeper_mt.so-o a
#include<stdio.h>
#include<string.h>
#include"zookeeper.h"
#include"zookeeper_log.h"
void zktest_watcher_g(zhandle_t* zh, int type, int state, const char* path, void* watcherCtx)
{
printf("Something happened.\n");
printf("type: %d\n", type);
printf("state: %d\n", state);
printf("path: %s\n", path);
printf("watcherCtx: %s\n", (char *)watcherCtx);
}
//自己的监听函数
void watcher_myself(zhandle_t *zh,int type,int state,const char *path,void *watcherCtx)
{
printf("just for testing\n");
printf("path:%s\n",path);
}
//同步方式创建节点
void create(zhandle_t *zkhandle,char *str)
{
char path_buffer;
int bufferlen=sizeof(path_buffer);
printf("同步方式创建节点-----------------------\n");
int flag = zoo_create(zkhandle,str,"hahah",5,
&ZOO_OPEN_ACL_UNSAFE,0,
path_buffer,bufferlen);
if (flag!=ZOK)
{
printf("节点创建失败 \n");
exit(EXIT_FAILURE);
}
else
{
printf("创建的节点名称为：%s\n",path_buffer);
}
}
//同步方式获取节点数据
void get(zhandle_t* zkhandle)
{
printf("同步方式获取节点数据-----------------------\n");
char buffer1;
int bufferlen1=sizeof(buffer1);
int flag1=zoo_get(zkhandle,"/xyz3",0,
buffer1,&bufferlen1,NULL);
if (flag1 ==ZOK)
{
printf("节点/xyz3的数据为: %s\n",buffer1);
}
}
//exists
void exists(zhandle_t *zkhandle,char *str)
{
int flag = zoo_exists(zkhandle,str,1,NULL);
}
void wexists(zhandle_t *zkhandle,char *str)
{
int flag=zoo_wexists(zkhandle,str,watcher_myself,"test",NULL);
}
//同步方式获得子节点信息
void getChildren(zhandle_t *zkhandle,char *str)
{
struct String_vector strings;
struct Stat stat;
int flag = zoo_wget_children2(zkhandle,str,
watcher_myself,"testgetChildren",
&strings,&stat);
if (flag==ZOK)
{
int32_t i=0;
for (;i<strings.count;++i)
printf("%s\n",strings.data);
}
}
//获取ACL信息
void getACL(zhandle_t *zkhandle,char *str)
{
struct ACL_vector acl;
struct Stat stat;
int flag = zoo_get_acl(zkhandle,str,&acl,&stat);
if (flag==ZOK)
{
printf("-----------------the ACL of %s:\n------------",str);
printf("%d\n",acl.count);
printf("%d\n",acl.data->perms);
printf("%s\n",acl.data->id.scheme);
printf("%s\n",acl.data->id.id);
}
}
//删除节点
void delete(zhandle_t *zkhandle,char *str)
{
int flag = zoo_delete(zkhandle,str,-1);
if (flag==ZOK)
{
printf("delete node success\n");
}
}
int main(int argc, const char *argv[])
{
const char* host = "192.168.0.187:2181";
int timeout = 30000;
char buffer;
int *bufferlen;
zoo_set_debug_level(ZOO_LOG_LEVEL_WARN); //设置日志级别,避免出现一些其他信息
zhandle_t* zkhandle = zookeeper_init(host,zktest_watcher_g, timeout, 0, "hello zookeeper.", 0);
if (zkhandle ==NULL)
{
fprintf(stderr, "Error when connecting to zookeeper servers...\n");
exit(EXIT_FAILURE);
}
char str[]="/xyz30000000014";
// wexists(zkhandle,str);
// printf("---------------\n");
//create(zkhandle,str);
//get(zkhandle);
// getChildren(zkhandle,str);
//getACL(zkhandle,str);
delete(zkhandle,str);
}
参考：
（1）http://www.cnblogs.com/haippy/archive/2013/02/21/2919365.html Zookeeper
C API 指南一(准备工作)
（2）http://blog.iyunv.com/uid-16989284-id-2303676.html关于引入头文件，库
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