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[64];    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[64];    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);    }}//existsvoid 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[i]);    }}//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[512];    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.chinaunix.net/uid-16989284-id-2303676.html  关于引入头文件，库