C语言责任链模式示例代码

#include <stdio.h>
#include <assert.h>
#include "list.h"


static LIST_HEAD(chain_head);

enum
{
    PASS,
    REFUSE,
};

typedef struct
{
    int money;
    char* files;
} info_t;

typedef int (*request_handle)(info_t* info);

typedef struct
{
    request_handle func;
    ListObj list;
}chain_node_t;


int leader(info_t* info)
{
    assert(info != NULL);
    if(info->money < 1000) //金额小于1000就行
    {
        return PASS;
    }
    return REFUSE;
}


int hr(info_t* info)
{
    assert(info != NULL);
    if(info->money < 2000 && info->files != NULL) //金额小于2000且材料齐全
    {
        return PASS;
    }
    return REFUSE;
}


int boss(info_t* info)
{
    assert(info != NULL);
    if(info->files != NULL) //材料齐全就行，不差钱
    {
        return PASS;
    }
    return REFUSE;
}

//审批流程： leader->hr->boss
chain_node_t req_table[] = { {.func = leader}, {.func = hr}, {.func = boss} };

void main(void)
{
    /*将审批节点添加到责任链上*/
    for(int i = 0; i < sizeof(req_table) / sizeof(req_table[0]); i++)
    {
        list_insert_before(&chain_head, &(req_table[i].list));
    }

    /*报销内容*/
    info_t info = {.money = 900, .files = "files"};

    ListObj *node;
    list_for_each(node, &chain_head)
    {
        chain_node_t* req = list_entry(node, chain_node_t, list);
        if(req->func(&info) != PASS)
        {
            /*报销失败*/
            printf("Failed\r\n");
            return;
        }
    }
    /*报销成功*/
    printf("Success\r\n");
    return;
}