亚洲色精品aⅴ一区区三区,色偷偷亚洲女人天堂观看欧,国产aⅴ无码专区亚洲av麻豆

Camunda学习�Ҏ��

stone2083 — Mon, 16 May 2022 02:10:00 GMT

摘要: 1. 主要包括�Q?
架构总览、核心概念关�p�R��场景例子、源码分�?
2. ��阅读��序
2.1 从架构总览�Q�了解整体camunda概念�Q�包括DB表结构，内心有概念和底层存储的关�p�L��?
2.2 再解核心概念关系�Q�徏立业务概��c��代码模型、表�l�构的映��关�p?
2.3 通过场景例子�Q�了解不同概�늚�使用场景�Q�配�|?
2.4 通过源码分析�Q�了解底层实玎ͼ�方便必要时对其做扩展阅读全文

stone2083 2022-05-16 10:10 发表评论

IEEE 754 ��点存储��记

stone2083 — Thu, 12 Oct 2017 03:23:00 GMT

IEEE 754:

https://zh.wikipedia.org/wiki/IEEE_754

FLOAT:

31 30 22 15 7 0

+---+----------+---------+----------+----------+

| | | |

+---+----------+---------+----------+----------+

+ S + E + M +

EXAMPLE(5.5):

=============================

int main() {

float a = 5.5;

int *p = &a;

printf("%d\n", *p);

printf("%X\n", *p);

}

gcc -o main main.c; ./main

十进�Ӟ�� 1085276160

十六�q�制�Q? 40B00000

=============================

十进�?= 二进�?= 二进制指数�Ş�?/p>

5.5 = 101.1 = 1.011 * 2^2

==> S=0 E=2 M = 11

31 30 22 15 7 0

+---+----------+---------+----------+----------+

| 0 | 10000001 | 0110000 | 00000000 | 00000000 |

+---+----------+---------+----------+----------+

+ S + E + M +

转换成INT:

二进�Ӟ�� 01000000101100000000000000000000

十进�Ӟ�� 1085276160

十六�q�制�Q? 40B00000

EXAMPLE(5.1):

===========================================

int main() {

float a = 5.1;

int *p = &a;

printf("Float�Q�\t%f\n", a);

printf("十进�Ӟ��\t%d\n", *p);

printf("十六�q�制�Q�\t%X\n", *p);

}

gcc -o main main.c; ./main

Float�Q? 5.100000

十进�Ӟ�� 1084437299

十六�q�制�Q? 40A33333

===========================================

存储形式�Q?b01000000101000110011001100110011

有效��数�Q?1000110011001100110011

表达方式�Q?.01000110011001100110011 * 2^2 ==> 101.000110011001100110011

101 ==> 5

0.000110011001100110011 ==> 2^-4 + 2^-5 + 2^-8 + 2^-9 + 2^-12 + 2^-13 + 2^-16 + 2^-17 + 2^-20 + 2^-21

实际表达�Q? 5.09999990463256836

保留6位小敎ͼ� 5.100000

stone2083 2017-10-12 11:23 发表评论

socks协议+netty实现�Q�协议部分）

stone2083 — Thu, 08 Sep 2016 04:51:00 GMT

stone2083 2016-09-08 12:51 发表评论

docker overlay network

stone2083 — Wed, 21 Oct 2015 07:14:00 GMT

摘要: docker overlay network 阅读全文

stone2083 2015-10-21 15:14 发表评论

stone2083 — Fri, 08 May 2015 05:01:00 GMT

摘要: 四张图了解iptables原理和��?nbsp; 阅读全文

stone2083 2015-05-08 13:01 发表评论

mykeepass for command line

stone2083 — Thu, 06 Nov 2014 06:45:00 GMT

命��o行下的类似keepass一个东�?

如何使用

Command line for Keep Password.
Usage:
  keepass.sh -l
  keepass.sh -e plain-text
  keepass.sh -d encoded-text
  keepass.sh -s encoded-text name

-l
展示保存下所有加密后的密码信�?br />-e
��明文密�? 加密, 密文自动保存到剪切板�?br />-d
��密文界�? 解密后的明文自动保存到剪切板�?br />-s
��密文持久化保存到文件中

代码实现

#!/bin/sh

DATA="$HOME/.password/data"
declare -a passwords

function enc()
{
    #$1: plain text
    echo "$1" | openssl enc -des | base64
}

function dec()
{
    #$1: encoded text
    echo "$1" | base64 -D | openssl enc -des -d
}

function sync()
{
    for ((loop=0;loop<${#passwords[*]};loop++))
    do
        if [ -z "${passwords[$loop]}" ];then
            continue
        fi
        value="$value\n${passwords[$loop]}"
    done
    echo $value > $DATA
}

function save()
{
    #$1 encoded password
    #$2 name
    for ((loop=0; loop<${#passwords[*]}; loop++))
    do
        info=${passwords[$loop]}
        password=$(echo $info | awk '{print $1}')
        name=$(echo $info | awk '{print $2}')
        if [ "$2" == "$name" ];then
            passwords[$loop]="$1 $2"
            return
        fi
    done
    passwords[$loop]="$1 $2"

    sync
}

function delete()
{
    #$1: name
    for ((loop=0; loop<${#passwords[*]}; loop++))
    do
        info=${passwords[$loop]}
        password=$(echo $info | awk '{print $1}')
        name=$(echo $info | awk '{print $2}')
        if [ "$1" == "$name" ];then
            passwords[$loop]=""
        fi
    done

    sync
}

function list()
{
    for ((loop=0;loop<${#passwords[*]};loop++))
    do
        echo ${passwords[$loop]}
    done
}

function help()
{
    echo "Command line for Keep Password.
Usage:
  keepass.sh -l
  keepass.sh -e plain-text
  keepass.sh -d encoded-text
  keepass.sh -s encoded-text name"
}

function init()
{
    loop=0
    while read line
    do
        if [ -z "$line" ];then
            continue
        fi
        passwords[$loop]=$line
        loop=$(echo $loop+1 | bc)
    done < $DATA
}

init
case "$1" in
    -l)
        list
        ;;
    -e)
        enc "$2" | tr -d '\n' | pbcopy
        ;;
    -d)
        dec "$2" | tr -d '\n' | pbcopy
        ;;
    -s)
        save "$2" "$3"
        ;;
    -r)
        delete "$2"
        ;;
    *)
        help
        ;;
esac

备注:
1. �U�shell打�?br />2. 目前支持Mac shell, 理论上支持linux�pȝ��(唯一的改�? 把pbcopy�Ҏ��linux下剪切板复制的命令即�?

stone2083 2014-11-06 14:45 发表评论

SCP限速逻辑实现--带中文注释的bandwidth_limit函数

stone2083 — Mon, 22 Sep 2014 09:45:00 GMT

SCP限速逻辑实现--带中文注释的bandwidth_limit函数

SCP支持限�? 通过-l参数, 指定拯��的速度

-l limit
Limits the used bandwidth, specified in Kbit/s.

具体实现, 是在misc.c中的bandwidth_limit函数
下面附上带中文注释的bandwidth_limit函数代码

1 struct bwlimit {
2     size_t buflen;                 // 每次read的buf长度
3     u_int64_t rate, thresh, lamt;  // rate:  限速速率, 单位kpbs
4                                    // thresh:�l�计周期,read长度��C��指定阈�? 触发限速统�?br /> 5                                    // lamt:  一�ơ统计周期内, read了多��长�?/span>
6     struct timeval bwstart, bwend; // bwstart: �l�计周期之开始时�?br /> 7                                    // bwend:   �l�计周期之结束时�?/span>
8 };
9
10 void bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
11 {
12     bw->buflen = buflen;          // 初始化read buf长度
13     bw->rate = kbps;              // 初始化限速速率
14     bw->thresh = bw->rate;        // 初始化统计周�?/span>
15     bw->lamt = 0;                 // 初始化当前read长度
16     timerclear(&bw->bwstart);     // 初始化统计开始时�?/span>
17     timerclear(&bw->bwend);       // 初始化统计结束时�?/span>
18 }
19
20 void bandwidth_limit(struct bwlimit *bw, size_t read_len)
21 {
22     u_int64_t waitlen;
23     struct timespec ts, rm;
24
25     // 讄��l�计开始时�? 为当前时�?/span>
26     if (!timerisset(&bw->bwstart)) {
27         gettimeofday(&bw->bwstart, NULL);
28         return;
29     }
30
31     // 讄��当前read长度
32     bw->lamt += read_len;
33     // 判断当前read长度是否到达�l�计周期的阈�?/span>
34     if (bw->lamt < bw->thresh)
35         return;
36
37     // 讄��l�计�l�束旉��,为当前时�?/span>
38     gettimeofday(&bw->bwend, NULL);
39     // bwend变量复用, �q�个时�? bwend含义�? 本次�l�计周期实际开销的时�? 既read thresh长度字节,�׃��多少旉��.
40     timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
41     if (!timerisset(&bw->bwend))
42         return;
43
44     // ��单位从Byte变成bit
45     bw->lamt *= 8;
46     // �Ҏ��限速速率, 计算理论应该��p��多少旉��
47     waitlen = (double)1000000L * bw->lamt / bw->rate;
48     // bwstart变量复用, �q�个时�? bwstart含义�? 本次�l�计周期理论开销的时�?/span>
49     bw->bwstart.tv_sec = waitlen / 1000000L;
50     bw->bwstart.tv_usec = waitlen % 1000000L;
51
52     // 如果理论开销旉�� >  实际开销旉��, 则需要做限�?/span>
53     if (timercmp(&bw->bwstart, &bw->bwend, >)) {
54         // bwend变量复用, �q�个旉��, bwend含义�? 理论开销旉�� ?nbsp;实际开销旉��的差�? 既需要sleep的时�? ��保辑ֈ�限速到指定的rate�?/span>
55         timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
56
57         // 如果差��D��C��U��, 则需要降低统计周期阈�? ��保�l�计相对�_��
58         // thresh变�ؓ原先�?/2, 但不能低于buflen�?/4
59         if (bw->bwend.tv_sec) {
60             bw->thresh /= 2;
61             if (bw->thresh < bw->buflen / 4)
62                 bw->thresh = bw->buflen / 4;
63         }
64         // 如果差值小�?0毫秒, 则需要加大统计周期阈�? ��保�l�计相对�_��
65         // thresh变�ؓ原先�?�? 但不能高于buflen�?�?/span>
66         else if (bw->bwend.tv_usec < 10000) {
67             bw->thresh *= 2;
68             if (bw->thresh > bw->buflen * 8)
69                 bw->thresh = bw->buflen * 8;
70         }
71
72         // 乖乖的睡一会吧, 以达到限速目�?/span>
73         TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
74         while (nanosleep(&ts, &rm) == -1) {
75             if (errno != EINTR)
76                 break;
77             ts = rm;
78         }
79     }
80
81     // 新的�l�计周期开�? 初始化lamt, bwstart变量
82     bw->lamt = 0;
83     gettimeofday(&bw->bwstart, NULL);
84 }

stone2083 2014-09-22 17:45 发表评论

��图片�{成HTML格式--原理&代码

stone2083 — Fri, 20 Dec 2013 06:28:00 GMT

之前的文章，因�ؓ贴了效果图，��D��无法�~�辑�?br />

@see http://www.tkk7.com/stone2083/archive/2013/12/20/407807.html

原理

使用table,tr/td作�ؓ一个像素点�Q�画炏V�?br />

代码

2 import sys, optparse, Image
3
4 TABLE='%s'
5 TR='%s'
6 TD=''
7
8 def rgb2hex(rgb):
9     return '#{:02x}{:02x}{:02x}'.format(rgb[0],rgb[1],rgb[2])
10
11 def get_image(name, thumbnail=1):
12     if(thumbnail >= 1 or thumbnail <= 0):
13         return Image.open(name)
14     else:
15         img = Image.open(name)
16         return img.resize((int(img.size[0] * thumbnail),int(img.size[1] * thumbnail)))
17
18 def convert(img):
19     trs = []
20     for height in xrange(img.size[1]):
21         tds = []
22         for width in xrange(img.size[0]):
23             tds.append(TD % rgb2hex(img.getpixel((width, height))))
24         trs.append(TR % (''.join(tds)))
25     return TABLE % (''.join(trs),)
26
27 parser = optparse.OptionParser('Usage: %prog [options] image')
28 parser.add_option('-c', '--compress', dest='thumbnail', default='1', metavar='float', help='specify the compress value (0, 1)')
29 parser.add_option('-o', '--out', dest='out', default='out.html', help='specify the output file')
30 opts, args = parser.parse_args()
31
32 if(len(args) != 1):
33     parser.print_help()
34     sys.exit(-1)
35
36 html = open(opts.out,'w')
37 html.write(convert(get_image(args[0], float(opts.thumbnail))))
38 html.close()

下蝲地址

https://code.google.com/p/stonelab/downloads/detail?name=img2html.py#makechanges

stone2083 2013-12-20 14:28 发表评论

��图片�{成HTML格式�Q�－用HTML��d��

stone2083 — Fri, 20 Dec 2013 06:18:00 GMT

摘要: 介绍 img2html�Q�将囄��转成HTML格式�?用HTML来画图�? 效果原始囄�� 转成HTML后的效果�Q�压�~?倍后的效�?-��L��Q�请查看html源码�Q�这�Ҏ��有src囄��属性，全是通过html代码渲染�Q? ... 阅读全文

stone2083 2013-12-20 14:18 发表评论

stone2083 — Mon, 19 Aug 2013 05:15:00 GMT

pystack: python stack trace. �c�M��java中的jstack功能.
使用方式:
1. https://pypi.python.org/pypi/pdbx/0.3.0 下蝲, 或者直接通过easyinstall安装
2. python scripts�? import pdbx; pdbx.enable_pystack(); 开启pystack功能
3. kill -30 pid , ��可以打印stack信息�?
�?

"CP Server Thread-10" tid=4564467712
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-9" tid=4560261120
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-1" tid=4526608384
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-7" tid=4551847936
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-4" tid=4539228160
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-2" tid=4530814976
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"MainThread" tid=140735286018432
    at app.run()(raspctl.py:173)
    at return wsgi.runwsgi(self.wsgifunc(*middleware))(application.py:313)
    at return httpserver.runsimple(func, validip(listget(sys.argv, 1, '')))(wsgi.py:54)
    at server.start()(httpserver.py:157)
    at self.tick()(__init__.py:1765)
    at s, addr = self.socket.accept()(__init__.py:1800)
    at sock, addr = self._sock.accept()(socket.py:202)
    at pystack()(pdbx.py:181)
    at for filename, lineno, _, line in traceback.extract_stack(stack):(pdbx.py:169)

"CP Server Thread-5" tid=4543434752
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-8" tid=4556054528
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-3" tid=4535021568
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

"CP Server Thread-6" tid=4547641344
    at self.__bootstrap_inner()(threading.py:525)
    at self.run()(threading.py:552)
    at conn = self.server.requests.get()(__init__.py:1367)
    at self.not_empty.wait()(Queue.py:168)
    at waiter.acquire()(threading.py:244)

核心代码:

# pystack
def pystack():
    for tid, stack in sys._current_frames().items():
        info = []
        t = _get_thread(tid)
        info.append('"%s" tid=%d' % (t.name, tid))
        for filename, lineno, _, line in traceback.extract_stack(stack):
            info.append('    at %s(%s:%d)' % (line, filename[filename.rfind('/') + 1:], lineno))
        print '\r\n'.join(info)
        print ''

def _get_thread(tid):
    for t in threading.enumerate():
        if t.ident == tid:
            return t
    return None

def _pystack(sig, frame):
    pystack()

def enable_pystack():
    signal.signal(signal.SIGUSR1, _pystack)

有需要的朋友,赶紧拿走�?

stone2083 2013-08-19 13:15 发表评论

亚洲色精品aⅴ一区区三区,色偷偷亚洲女人天堂观看欧,国产aⅴ无码专区亚洲av麻豆

Camunda学习�Ҏ��

IEEE 754 ���点存储���记

socks协议+netty实现�Q�协议部分）

docker overlay network

mykeepass for command line

SCP限速逻辑实现--带中文注释的bandwidth_limit函数

���图片�{成HTML格式--原理&代码

原理

代码

下蝲地址

���图片�{成HTML格式�Q�－用HTML��d��

IEEE 754 ��点存储��记

��图片�{成HTML格式--原理&代码

��图片�{成HTML格式�Q�－用HTML��d��