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New self vs. new static
...u called the method on.
In the following example, B inherits both methods from A. The self invocation is bound to A because it's defined in A's implementation of the first method, whereas static is bound to the called class (also see get_called_class()).
class A {
public static function get_se...
React.js: Wrapping one component into another
...it easy to pass the props down do children component (in this case Hello). From React 0.14.* onwards the only way to pass props to children components would be to use React.createClone, which might be expensive.
– Mukesh Soni
Sep 10 '15 at 18:47
...
Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...e];
return cell;
}
The above code addresses a few problems stemming from the fact that the cell is reused:
You're not initializing the cell image before initiating the background request (meaning that the last image for the dequeued cell will still be visible while the new image is download...
How to manually set an authenticated user in Spring Security / SpringMVC
...ssword, HttpServletRequest request) {
try {
// Must be called from request filtered by Spring Security, otherwise SecurityContextHolder is not updated
UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(username, password);
token.setDetail...
Should logger be private static or not
...ogger as static prevents the declaring class (and associated classloaders) from being garbage collected in J2EE containers that use a shared classloader. This will result in PermGen errors if you redeploy your application enough times.
I don't really see any way to work around this classloader leak...
How do you automatically resize columns in a DataGridView control AND allow the user to resize the c
...athever mode you need and then column by column you store the width it got from autosize calculation, remove autosizing and set width to value you stored before.
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Backing beans (@ManagedBean) or CDI Beans (@Named)?
...ebFilter, @WebServlet, @Path, @Stateless, etc and even a JSF @ManagedBean. From the other side on, @ManagedProperty does not work inside a @Named or any other container managed artifact. It works really only inside @ManagedBean.
Another difference is that CDI actually injects proxies delegating to t...
Weak and strong property setter attributes in Objective-C
...rent so neither is ever released).
The 'toll free bridging' part (casting from NS to CF) is a little tricky. You still have to manually manage CFRelease() and CFRetain() for CF objects. When you convert them back to NS objects you have to tell the compiler about the retain count so it knows what ...
Safely limiting Ansible playbooks to a single machine?
...local"
If {{ target }} isn't defined, the playbook does nothing. A group from the hosts file can also be passed through if need be. Overall, this seems like a much safer way to construct a potentially destructive playbook.
Playbook targeting a single host:
$ ansible-playbook user.yml --extra-var...
Should IBOutlets be strong or weak under ARC?
...
The current recommended best practice from Apple is for IBOutlets to be strong unless weak is specifically needed to avoid a retain cycle. As Johannes mentioned above, this was commented on in the "Implementing UI Designs in Interface Builder" session from WWDC 2...