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Redis消息通知系统的实现 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ontent content3
再把这三条消息发送给某个用户，其<USRID>是123：
redis> SADD usr:123:msg 1
redis> SADD usr:123:msg 2
redis> SADD usr:123:msg 3
此时如果简单查询用户有哪些消息的话，无疑只能查到一些<MSGID>：
redis> SMEMBERS usr:123:msg
1) "1"
2) "2...
Assert an object is a specific type
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Javascript : natural sort of alphanumerical strings
...ebeckennebec
89.8k2828 gold badges9696 silver badges123123 bronze badges
...
C# DateTime to “YYYYMMDDHHMMSS” format
...e has great examples check it out
// create date time 2008-03-09 16:05:07.123
DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);
String.Format("{0:y yy yyy yyyy}", dt); // "8 08 008 2008" year
String.Format("{0:M MM MMM MMMM}", dt); // "3 03 Mar March" month
String.Format("{0:d ...
grepping using the “|” alternative operator
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
TypeError: got multiple values for argument
...ass Example():
def is_overlapping(x1, x2, y1, y2):
# Thanks to https://stackoverflow.com/a/12888920/940592
return max(x1, y1) <= min(x2, y2)
Fails calling it like self.is_overlapping(x1=2, x2=4, y1=3, y2=5)
with:
{TypeError} is_overlapping() got multiple values for argu...
Check if an element is a child of a parent
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Remove/hide a preference from the screen
...pp:isPreferenceVisible="false" />
...
The attribute is documented at https://developer.android.com/guide/topics/ui/settings/components-and-attributes
Adding PreferenceFragmentCompat is documented at https://developer.android.com/guide/topics/ui/settings/#inflate_the_hierarchy
Example:
publi...
Calculating frames per second in a game
...
I think it's the simplest and preferred way. You just to keep track of
cn: counter of how many frames you've rendered
time_start: the time since you've started counting
time_now: the current time
Calculating the fps in this case is as simple as evaluating this formula:
FPS = cn / (time_now -...
How to convert an Int to a String of a given length with leading zeros to align?
How can I convert an Int to a 7-character long String , so that 123 is turned into "0000123" ?
7 Answers
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