thread-local

问题 I need to build a pool of workers in Java where each worker has its own connected socket; when the worker thread runs, it uses the socket but keeps it open to reuse later. We decided on this approach because the overhead associated with creating, connecting, and destroying sockets on an ad-hoc basis required too much overhead, so we need a method by which a pool of workers are pre-initializaed with their socket connection, ready to take on work while keeping the socket resources safe from

问题 Once I have came across a pattern, where ServletRequest and response objects are put to servlet's local ThreadLocal variables. The servlet class has also methods to get current request and response objects. So in order to get these objects you still need to operate with servlet object. What is the point of having these ThrealLocal local variables? 回答1: The point is to have the request and response objects in classes that would otherwise would not have them (for example they are not servlets).

问题 I have the following classes: public class AppContext { private static final ThreadLocal<AppContextData> contextHolder = new ThreadLocal<AppContextData>() { @Override protected AppContextData initialValue() { return new AppContextData(); } }; public static AppContextData get() { return contextHolder.get(); } public static void unset() { contextHolder.remove(); } } public class AppContextData { //many getter and setter methods } The website starts using the ThreadLocal object in an interceptor

问题 I'd like for incoming Java servlet web requests to invoke RabbitMQ using the RPC approach as described here. However, I'm not sure how to properly reuse callback queues between requests, as per the RabbitMQ tutorial linked above creating a new callback queue per every request is inefficient (RabbitMQ may not cope even if using the Queue TTL feature). There would generally be only 1-2 RPC calls per every servlet request, but obviously a lot of servlet requests per second. I don't think I can

问题 I'd like for incoming Java servlet web requests to invoke RabbitMQ using the RPC approach as described here. However, I'm not sure how to properly reuse callback queues between requests, as per the RabbitMQ tutorial linked above creating a new callback queue per every request is inefficient (RabbitMQ may not cope even if using the Queue TTL feature). There would generally be only 1-2 RPC calls per every servlet request, but obviously a lot of servlet requests per second. I don't think I can

问题 I have a requirement in my application that I think can be met by using thread local storage, but I'm wondering if it's one of those things that's best to avoid. I have read a few articles on the subject: http://www.dotnetcoders.com/web/Articles/ShowArticle.aspx?article=58 http://msdn.microsoft.com/en-us/library/system.threadstaticattribute(vs.80).aspx I know how to use it, I'm just wondering if I should use it. Any advice, gotchas to be aware of? [Edit] Here's the use case: I funnel all data

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: C++11 thread_local in gcc - alternatives Is there any way to fully emulate thread_local using GCC's __thread? I wanted to use the c++11 thread_local to create and use thread_local variable but as it is not yet supported by gcc, I am using gcc specific __thread . The way I declared the variable is myClass { public: static __thread int64_t m_minInt; }; __thread int64_t myClass::m_minInt = 100; When I compile it, I

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: C++11 thread_local in gcc - alternatives Is there any way to fully emulate thread_local using GCC's __thread? I wanted to use the c++11 thread_local to create and use thread_local variable but as it is not yet supported by gcc, I am using gcc specific __thread . The way I declared the variable is myClass { public: static __thread int64_t m_minInt; }; __thread int64_t myClass::m_minInt = 100; When I compile it, I

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: C++11 thread_local in gcc - alternatives Is there any way to fully emulate thread_local using GCC's __thread? I wanted to use the c++11 thread_local to create and use thread_local variable but as it is not yet supported by gcc, I am using gcc specific __thread . The way I declared the variable is myClass { public: static __thread int64_t m_minInt; }; __thread int64_t myClass::m_minInt = 100; When I compile it, I

问题 I'm looking at some legacy code which has the following idiom: Map<String, Boolean> myMap = someGlobalInstance.getMap(); synchronized (myMap) { item = myMap.get(myKey); } The warning I get from Intelli-J's code inspections is: Synchronization on local variable 'myMap' Is this the appropriate synchronization and why? Map<String, Boolean> myMap = someGlobalInstance.getMap(); synchronized (someGlobalInstance.getMap()) { item = myMap.get(myKey); } 回答1: The reason this is flagged as a problem is