学步园

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);
    }
}
//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[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);


}

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