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How do servlets work? Instantiation, sessions, shared variables and multithreading
...guages which maintains the session by a cookie are sensitive as well, like PHP with PHPSESSID cookie, ASP.NET with ASP.NET_SessionID cookie, etcetera. That's also why URL rewriting with ;jsessionid=xxx as some JSP/Servlet MVC frameworks automatically do is frowned upon. Just make sure that session I...
Are JavaScript strings immutable? Do I need a “string builder” in JavaScript?
...ded to the existing value of "immutableString"
The resultant value is then allocated to a new block of memory
"immutableString" object now points to the newly created memory space
Previously created memory space is now available for garbage collection.
...
How to Sync iPhone Core Data with web server, and then push to other devices? [closed]
...ere is your server.
M3Synchronization * syncEntity = [[M3Synchronization alloc] initForClass: @"Car"
andContext: context
andServerUrl: kWebsiteUrl
...
What is the difference between List (of T) and Collection(of T)?
...ted in some discussion on why this might be. Maybe the list is better with allocating memory.
– Ray
Dec 29 '08 at 23:55
10
...
What is database pooling?
...e connections to multiple servers and multiple user accounts, they may pre-allocate some baseline of connections so some are ready immediately, and they may actually close old connections when the usage pattern quietens down.
...
Why isn't sizeof for a struct equal to the sum of sizeof of each member?
...f a (non-union) class declared without an intervening access-specifier are allocated so that later members have higher addresses within a class object"
– jfs
Apr 10 '17 at 20:40
...
Android. Fragment getActivity() sometimes returns null
...eFragment() {
// Implement the Parent.
super();
// Allocate the ActivityBuffer.
this.mActivityBuffer = new ActivityBuffer();
}
@Override
public final void onAttach(final Context pContext) {
// Handle as usual.
super.onAttach(pContext);
...
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is no
...it needs to, without giving yourself problems later on, because you hadn't allocated enough time for the process to finish. You can also avoid locking up your program by multi-threading.
– WonderWorker
Jul 2 '15 at 15:57
...
How do I design a class in Python?
...l methods.
Go through the adjectives, looking for potential attributes
Allocate methods and attributes to your classes
To refine the class, the book also advises we can do the following:
Write down (or dream up) a set of use cases—scenarios of how your program may be used. Try to c...
Initializing a struct to 0
...so just declare it myStruct _m;
If the data is a local variable or a heap-allocated zone, clear it with memset like:
memset(&m, 0, sizeof(myStruct));
Current compilers (e.g. recent versions of gcc) optimize that quite well in practice. This works only if all zero values (include null pointer...