Singleton Class

Using Singleton class, we allow creation of asingle object only for a given class.
How to create it??

- Make constructor private
- Create a reference of class and make it static
- Call the constructor through a function which is public and static
- put condition inside this function to call the constructor only once by checking if the reference had been initialized or not.

Note: If we have two threads accessing the same code then it's possible that we get two objects in two different threads which are competing to get that object. So we can synchronize the code snippet inside the function for assuring the creation of a single object only.

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VBA MAcro to generate "table of contents with hyperlinks" automatically in a ppt

VBA MAcro to generate "table of contents with hyperlinks" automatically in a ppt:

Function TableOfContent(count As Integer)
'count is the no. of slides in ppt
Dim var As Integer
Dim i As Integer, scount As Integer
Dim strSel As String, strTitle As String, strb As String, strtemp As String, str As String
Dim arr() As String
Dim index As Integer, indexcount As Integer, slidecount As Integer
Dim summary As Slide
Dim para As Integer
Dim slideOrder() As Integer

'To generate the Table of contents slide
ReDim slideOrder(count - 2)

'Collect all the IDs of the selected slides
For i = 1 To count - 2
slideOrder(i) = i + 2
Next

'Iterate over the slides in Index order
slidecount = UBound(slideOrder)
For scount = 1 To slidecount
If ActivePresentation.Slides(slideOrder(scount)).Shapes.HasTitle Then
'Build up the ToC Text
strTitle = ActivePresentation.Slides(slideOrder(scount)).Shapes("UseCase").TextFrame.TextRange.Text + ": "
str = ActivePresentation…

How to do mass insert in redis

A basic and fairly easy way to do mass insert in redis:

Command to use: echo -e "$(cat redis_mass_insert.txt)" | redis-cli --pipe
Content of file "redis_mass_insert.txt": *3\r\n$5\r\nlpush\r\n$5\r\nu:m:1\r\n$5\r\nvalu1\r\n*3\r\n$5\r\nlpush\r\n$5\r\nu:m:1\r\n$7\r\nmyvalue\r\n

Result: All data transferred. Waiting for the last reply...
ERR unknown command ' *2'
ERR unknown command '$4'
ERR wrong number of arguments for 'echo' command
ERR unknown command '$20'
ERR unknown command ' A�j d�Q;yT��ҡ �h>'

NOTE: command line will show error but in actual the data is transferred and you can check it by entering in redis.

Here's the snapshot of the whole procedure:

To check how the command is responding: use hexdump -C
Command: echo -n $'$3\r\nset\r\n$3\r\nkey\r\n$5\r\nvalue\r\n ' | hexdump -C
whose output will be something like
00000000 24 33 0d 0a 73 65 74 0d 0a 24 33 0d 0a 6b 65 79 |$3..set..$3..key|
00000010 0d 0a…

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VBA MAcro to generate "table of contents with hyperlinks" automatically in a ppt

How to do mass insert in redis

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