thread-safety

问题 I have some spring-boot application (it exposes rest api). The mentioned REST API is secured by spring-security . Everything is fine, however now I need to set context for servicing request. Setting context is about choosing datasource in depends on user context. The key is that RoutingDataSource need to use this context. (This context must be set directly after authenticating request due to other causes, I have also other thread which use RoutingDataSource, but no invoked by request (no user

问题 I have some spring-boot application (it exposes rest api). The mentioned REST API is secured by spring-security . Everything is fine, however now I need to set context for servicing request. Setting context is about choosing datasource in depends on user context. The key is that RoutingDataSource need to use this context. (This context must be set directly after authenticating request due to other causes, I have also other thread which use RoutingDataSource, but no invoked by request (no user

问题 Accessing controls in a thread-safe manner takes longer to code than seems necessary because I have to repeat functions like the following over and over: Private Sub SettbEnabled(tb As TrackBar, value As Integer) If tb.InvokeRequired Then tb.Invoke(Sub() tb.Enabled = value) Else tb.Enabled = value End If End Sub I could end up writing one for every method and property of every control. Is there a more efficient way to code this? Ideally just one sub for the entire app, that I can use no

问题 In java's documentation it says that in the below example, the condition will be true: String a = new String("ABC"); String b = new String("ABC"); if (a.intern() == b.intern()) { .... } I wanted to know, if that is still true when considering that a and b are defined in different Threads , or even different ClassLoaders ? This question rose when I needed an ability to synchronize a block that loads a certain configuration based on an entity's name, so I wanted to do something like:

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I have been thinking of send a proposal to the Java language architects. In a synchronized block synchronized(lock) { // If there is

问题 Are the basic arithmetic operations Thread safe? For example, if there is ++ operation on a global variable, which will be modified from different threads, is it necessary to a lock around it? For example void MyThread() // can have many running instances { aGlobal++; } or should it be void MyThread() { lock( lockerObj) { aGlobal++; } } 回答1: The spec sums it up very well. Section 5.5, "Atomicity of variable references": Reads and writes of the following data types are atomic: bool, char, byte

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I am working on a program that deals with multiple threads accessing, depositing in, and withdrawing from a bounded buffer container. I have noticed some major problems with the threads and suspect that my buffer is partially or fundamentally incorrect somewhere. To be sure I know what I am doing with this, I

问题 Are the Stubs generated by WSDL2JAVA (using XMLBeans binding option) through Axis2 1.5.4 thread-safe? Actually I have created one Stub for a Web Service that I am invoking through multiple threads. I have configured my own MultiThreadedHttpConnectionmanager and set the HTTPConstants.REUSE_HTTP_CLIENT as well but I am seeing some NullPointerExceptions in stub._getServiceClient().cleanupTransport that I call after each invocation. Sometimes the threads hang too. At the same time I noticed that

问题 I have a question regarding synchronization of code that is executed by several threads: As far as I know each thread has its own stack, hence, non-static variables exist in different locations in the memory for each thread (for X threads there are X stacks that include all non-static variables). So why there's a need to synchronize anything? I mean, if the code that the threads execute includes some class variable v1, then each thread has its own "instance" of v1 (different memory address),

问题 I have some general questions regarding the java.util.zip library. What we basically do is an import and an export of many small components. Previously these components were imported and exported using a single big file, e.g.: <component-type-a id="1"/> <component-type-a id="2"/> <component-type-a id="N"/> <component-type-b id="1"/> <component-type-b id="2"/> <component-type-b id="N"/> Please note that the order of the components during import is relevant. Now every component should occupy