In this user guide, we describe some of the possible causes that can be caused by threadlocal in a servlet, and then we suggest ways to solve this problem.
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The Java ThreadLocal class provides constraints for local threads. This allows you to create problems that can only be read as write access on the same thread. Hence, if two threads are executing comparable code and that code has a large reference to the ThreadLocal variable, the two threads cannot see that particular local variable from each other.
Are the threadlocals variables summarized for all requests so that you can find the servlet with a specific variable?
- initialize a static variable when starting a request.
- be able to set the value of a variable in a careful safety thread, continuing to execute methods called ab servlet until the request completes
requested on Nov 28, 2008 6:54 pm
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The short answer is yes.
A little more: this is what makes spring special. See RequestContextHolder (via DocJar).
Care must be taken, however – you need to know when to invalidate a ThreadLocal, which method is used to refer to other threads, and how (not) to get confused in a local non-thread context.
answered Dec 17, 2008 at 13:17
How is ThreadLocal implemented?
ThreadLocalMap implementation is not a WeakHashMapbut it follows the same basic contract, including storing its keys with a weak reference. Basically, use a plan in this thread to store all ThreadLocal objects.
I think they definitely match everything m the requirements of this particular thread. Other threads get copies of others in the local data of the thread. This is the main key storage point:http: // en thread-local.wikipedia.org/wiki/Thread-local_storage#Java.
If you do not enable the appropriate option in the servlet configuration, the servlet text field will use your post-multiple servlet to handle requests appropriately. It would be effective to have suppression data for each thread that improves customer service.
If your web application is not propagated (running on multiple Java VMs), you can use the
ServletContext dot store to communicate between tasks and threads (then make sure you block correctly).
decided on Nov 26 ’08 at 18:58
As Adiel told me, the correct way to highlight it is probably using the Ask context (like HttpServletRequest) rather than trying to create a ThreadLocal. While using ThreadLocal here is certainly possible, buyers should be careful to clear their thread on startup, otherwise the next prompt the thread receives will represent the value associated with the previous request. (If the first request is usually done by a thread, the space will be returned to the pool as well, so that the next request will see it.) There is no need to handle this factor if the request context prevails for that.
received a response on December 17, 2008 at 3:55
Using ThreadLocal to store on-demand information may end up using Servlet 3.0 suspended requests (or pierce extensions).Using these threads by multiple APIs handles a personal request.
Is it good to use ThreadLocal?
ThreadLocal is a simple and flexible tactic for having streamed data that really cannot be accessed by other threads at the same time without much effort or compromise in configuration. A thread is an execution model, so multiple threads can neatly execute the same code at the same time.
answered Jun 3 ’14 at 4:25
What is ThreadLocal and its uses?
You can use the Java ThreadLocal class to create your own variables that can only be examined and written through the same binding. Although two threads usually execute the same code, and each code refers to the same ThreadLocal variable, the two posts cannot see the asterisks of the other’s ThreadLocal variable.
Limits on local streams are always set globally available, since the goal is to transfer information seamlessly over any system that can be accessed from virtually anywhere. The value of an element is bound to the stream in which it is defined. Although the variable is global, it can have different meanings depending on when the channel is likely to be available.
A simple example would be to assign a user id string that will be returned to a thread in a thread counter variable if the received request was in a servlet. Anywhere in the processing chain for this get (assuming it is on the same thread in the same VM), the entire identity can be obtained by getting this global variable. It can also be important to remove this valuable value when processing the request because the thread is put back into the thread pool.
answered Nov 26I’m 2008 at 19:25
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