Archive for the ‘Development’ Category
Posted by jpluimers on 2015/11/11
Really exiting times ahead: Microsoft .Net on Linux.
It’s not fully ready yet, but to get an idea to learn more about running OpenShift Enterprise 3 and a .NET application based on a Red Hat Enterprise Linux container, here are a few links to get started:
I wish that the demo repository at https://github.com/munchee13/snoopalicious.git and the rhosepaas.com domain were accessible (:
There are other alternatives too, but OpenShift (RedHat) and Microsoft working together is really exiting news to me.
If you’re on other distros, here are some more links:
And of course there has been Mono for a while, which is a different implementation of .NET:
Hopefully this will have search results soon: dnvm opensuse tumbleweed.
–jeroen
Posted in *nix, .NET, Development, Linux, OpenShift, openSuSE, Power User, RedHat, Software Development, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2015/11/11
Interesting: Hash Toolkit – Reverse MD5 / SHA1 Hashes
They generate and allow you to generate various hashes, and store both the hash and original so you can reverse it.
Not meant for production data, but an approach for verifying if you do hashing correctly.
–jeroen
via: Hash Toolkit – Reverse MD5 / SHA1 Hashes.
Posted in Development, Hashing, md5, Power User, Security, Software Development | Leave a Comment »
Posted by jpluimers on 2015/11/05
Interesting: Life in a post-database world: using crypto to avoid DB writes.
For some security related operations, you only need smart use of HMAC, and no temporary database entries.
Thanks for the Jan Wildeboer referral to this.
–jeroen
Posted in Development, Hashing, Power User, Security, Software Development | Leave a Comment »
Posted by jpluimers on 2015/11/04
From a chat with a co-worker a while ago:
|
I’m not against properties. Just something against properties properties that are objects with writeable fields.
|
So even if you expose such a property as read-only, it can still get its writeable fields overwritten.
That is a pain when those are part of the state of the underlying object.
In other words: encapsulate your state changes.
Here we solved it by making
- the type of the property immutable
- the property writeable
- react on state changes during the write
Proper encapsulation.
In this case it was a project mixing C# and Delphi, but you can easily apply the above to any language featuring classes and properties.
Another solution would have been to extend the type of the property so it can expose an event that fires during change. Much more convoluted.
–jeroen
Posted in .NET, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, C# 6 (Roslyn), Delphi, Delphi 10 Seattle, Delphi 2007, Delphi 2009, Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | 2 Comments »
Posted by jpluimers on 2015/11/03
Lazy<T> is not constrained to static contexts.
Instance field initialisers cannot use instance references (but can use static references) as they run outside of the constructor.Though there are arguments for instance field initialisers too., I think this is a good reason to initialise fields inside the constructor: there you do have access to instance references (but should not call virtual instance methods or properties) which leads to another reason: consistency as field initialisers run in the opposite hierarchy order as constructors (incidentally causing this virtual method restriction).
Boy, that was a long sentence (:
–jeroen
via:
Posted in .NET, .NET 1.x, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, C# 6 (Roslyn), Development, Software Development | Leave a Comment »
Posted by jpluimers on 2015/10/31
Question: Can you explain how to use OR, AND and NOT operators in Unix grep command with some examples?
Source: 7 Linux Grep OR, Grep AND, Grep NOT Operator Examples
Posted in *nix, *nix-tools, Power User, RegEx | Leave a Comment »
Posted by jpluimers on 2015/10/29
On a system where I just added a new E: drive, it was indeed available as
wmic logicaldisk where drivetype=3 get caption,filesystem,drivetype,providername,volumename
would output:
Caption DriveType FileSystem ProviderName VolumeName
C: 3 NTFS
D: 3 NTFS
E: 3 NTFS
But it would not list as an administrative share since
net share
would give:
Share name Resource Remark
-------------------------------------------------------------------------------
IPC$ Remote IPC
ADMIN$ C:\WINDOWS Remote Admin
D$ D:\ Default share
C$ C:\ Default share
The command completed successfully.
I wonder why the E$ drive was not visible. If anyone knows a better solution than a reboot, please let me know.
This was after the reboot:
Share name Resource Remark
-------------------------------------------------------------------------------
IPC$ Remote IPC
ADMIN$ C:\WINDOWS Remote Admin
D$ D:\ Default share
E$ E:\ Default share
C$ C:\ Default share
The command completed successfully.
–jeroen
via:
Posted in Batch-Files, Development, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2015/10/28
Tibco is very powerful and can do all sorts of casting.
For my memory (formatted for readability; there are more details at OpenPGM Concepts : Transport):
The network parameter consists of up to three parts, separated by semicolons—network, multicast groups, send address—as in these examples:
| Example |
Meaning |
| lan0 |
network only |
| lan0;225.1.1.1 |
one multicast group |
| lan0;225.1.1.1,225.1.1.5;225.1.1.6 |
two multicast groups, send address |
| lan0;;225.1.1.6 |
no multicast group, send address |
The format is like this:
partOne;partTwo;partThree
and some bits are optional
partOne[;[partTwo][;[partThree]]]
Part one identifies the network, which you can specify in several ways: – Host name, Host IP address, Network name, Network IP number, Interface name, Default TRDP daemons use the network interface which corresponds to the hostname of the system as determined by the C function gethostname(). PGM daemons use the default PGM multicast interface, 224.0.1.78.
Part Two—Multicast Groups – Part two is a list of zero or more multicast groups to join, specified as IP addresses, separated by commas. Each address in part two must denote a valid multicast address. Joining a multicast group enables listeners on the resulting transport to receive data sent to that multicast group.
Part Three—Send Address, Part three is a single send address. When a program sends multicast data on the resulting transport, it is sent to this address. (Point-to-point data is not affected.) If present, this item must be an IP address—not a host name or network name. The send address need not be among the list of multicast groups joined in part two. If you join one or more multicast groups in part two, but do not specify a send address in part three, the send address defaults to the first multicast group listed in part two.
Note: I wasn’t aware that for Tibco Rendezvous the default multi-cast network was 225 (often you see 224 here, as that is the starting multi-cast range in the IANA IPv4 Address Space list)
–jeroen
via:
Posted in Communications Development, Development, Internet protocol suite, Network-and-equipment, Software Development, TCP, TIBCO Rendezvous | Leave a Comment »
Posted by jpluimers on 2015/10/27
Today it is about the curse of
ORA-12560: TNS:protocol adapter error
Don’t you love the overly generic error messages you often get, especially from Oracle.
We log the additional information which doesn’t bring much help either:
Errors:Oracle.DataAccess.Client.OracleErrorCollection; Number: 12560
There is so much that can cause the Oracle 12560 error (including spurious SSL things), that it is often like searching for a needle in a haystack.
What in fact happened is that in a few of our .NET config files got empty ConnectionString attributes for Data Source, User Id and Password as this fragment shows:
connectionString=”Data Source=; User Id=; Password=;”
The cause was a parameter substitution step in our build process where we generate each config file based on templates. It failed on some of them as this simple grep query can reveal:
grep -ind connectionstring\=.*\=; *.config
grep -indl connectionstring\=.*\=; *.config
The first one shows the files and lines, the second one only the files.
So we now have some guarding in place that will prevent these attributes to become empty.
–jeroen
Posted in .NET, .NET 4.0, .NET 4.5, C#, C# 3.0, C# 4.0, C# 5.0, C# 6 (Roslyn), Database Development, Development, OracleDB, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 