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Optimistic vs. Pessimistic locking
...stay unmodified for the duration, it's as accurate as pessimistic locking (select for update style) on those same records. The main difference is that optimistic locking incurs overhead only if there's a conflict, whereas pessimistic locking has reduced overhead on conflict. So optimistic is best ...
Immutable array in Java
...his can actually come in handy if you are using the List.toArray method to convert a List to an array. Since even an empty array takes up some memory, you can save that memory allocation by creating a constant empty array, and always passing it to the toArray method. That method will allocate a new ...
In Android, how do I set margins in dp programmatically?
...ould use RelativeLayout.LayoutParams or LinearLayout.LayoutParams.
And to convert your dp measure to pixel, try this:
Resources r = mContext.getResources();
int px = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
yourdpmeasure,
r.getDisplayMetrics()
);
...
Interactive search/replace regex in Vim?
...info on the options available once substitution with confirmation has been selected. Use:
:h :s
Then scroll to section on confirm options. Screenshot below:
For instance, to substitute this and all remaining matches, use a.
...
Xcode 6 how to enable storyboard zoom?
... any level.. but then it'll snap to, say 100% or 50%. And STILL you can't select items on the Storyboard unless you're at 100%. I'm sorry.. what year is this again ?
– Mike Gledhill
Nov 26 '14 at 7:45
...
How to repeat last command in python interpreter shell?
...
In IDLE, go to Options -> Configure IDLE -> Keys and there select history-next and then history-previous to change the keys.
Then click on Get New Keys for Selection and you are ready to choose whatever key combination you want.
...
Java serialization: readObject() vs. readResolve()
...
When serialization is used to convert an object so that it can be saved in file, we can trigger a method, readResolve(). The method is private and is kept in the same class whose object is being retrieved while deserialization.
It ensures that after the d...
How do I clear stuck/stale Resque workers?
...gt; [#<Worker infusion.local:40194-0:JAVA_DYNAMIC_QUEUES,index_migrator,converter,extractor>]
pick the worker and prune_dead_workers, for example the first one
Resque.workers.first.prune_dead_workers
share
...
How to replace DOM element in place using Javascript?
...
Try using Google's Closure or another transpiler to convert to ES5. You shouldn't be writing old code based on browser support, if you have a better, more maintainable option
– Gibolt
Jan 12 '17 at 3:37
...
How to set an “Accept:” header on Spring RestTemplate request?
...RestTemplate restTemplate = new RestTemplate();
// Add the Jackson message converter
restTemplate.getMessageConverters()
.add(new MappingJackson2HttpMessageConverter());
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.set("Authoriz...