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Declaration/definition of variables locations in ObjectiveC?
Ever since starting to work on iOS apps and objective C I've been really puzzled by the different locations where one could be declaring and defining variables. On one hand we have the traditional C approach, on the other we have the new ObjectiveC directives that add OO on top of that. Could you fo...
Why are Subjects not recommended in .NET Reactive Extensions?
... are any message to process
For option 1, easy, we just wrap it with the appropriate FromEvent method and we are done. To the Pub!
For option 2, we now need to consider how we poll this and how to do this effciently. Also when we get the value, how do we publish it?
I would imagine that you woul...
What do 'statically linked' and 'dynamically linked' mean?
...es responsible for the dreaded "DLL hell" that some people mention in that applications can be broken if you replace a dynamically linked library with one that's not compatible (developers who do this should expect to be hunted down and punished severely, by the way).
As an example, let's look at...
What does “Could not find or load main class” mean?
...<arg> is an arbitrary command line argument that gets passed to your application.
1 - There are some other syntaxes which are described near the end of this answer.
The fully qualified name (FQN) for the class is conventionally written as you would in Java source code; e.g.
packagen...
Reduce, fold or scan (Left/Right)?
...
In general, all 6 fold functions apply a binary operator to each element of a collection. The result of each step is passed on to the next step (as input to one of the binary operator's two arguments). This way we can cumulate a result.
reduceLeft and reduc...
Tactics for using PHP in a high-load site
...isn't cutting, there are several techniques to scale up, depending on your app. Replicating to additional servers typically works well if you have more reads than writes. Sharding is a technique to split your data over many machines.
Caching
You probably don't want to cache in your database. The...
Best practices/guidance for maintaining assembly version numbers
...ers also mean different things depending on the context, is it an API, Web App, etc.
Major.Minor.Build.Revision
Revision This is the number taken from source control to identify what
was actually built.
Build This is an ever increasing number that can be used to find a
particular build on the bu...
Difference between CouchDB and Couchbase
...chOne, Couchbase, Couchbase Server, Couchbase Mobile, Couchbase Lite, CouchApps, BigCouch, Touchbase, Membase, Memcached, MemcacheDB... all different and yet related in a way not at all obvious from the names alone.
First, there was CouchDB, a database created by Damien Katz, a former IBM developer...
Mail multipart/alternative vs multipart/mixed
... else
cids.put(fileName,cid);
matcherCssUrl.appendReplacement(sb,replacement.replace("@cid",cid));
}
matcherCssUrl.appendTail(sb);
html = sb.toString();
return html;
}
private String getFileName(String fileName) {
if (fi...
How to debug Lock wait timeout exceeded on MySQL?
...ks a table, then sleeps while it waits for something non-MySQL-related to happen."
After re-re-reviewing the show engine innodb status log (once I'd tracked down the client responsible for the lock), I noticed the stuck thread in question was listed at the very bottom of the transaction list, benea...