Caching a JNI varaible in Java

Question

I am creating a Java server code that need to call native methods written by C. The C file will return values to Java. Now I need cache the values and also make it thread-safety as the server code support multiple threads. Static variable doesn't work to me as its value is shared by the threads. So how can I achieve it? Thanks.

Answer 1

Declare your native method with synchronized prefix to make sure the JNI call is thread-safe. For the cached purpose, you could use global reference or other general cache technique in JNI to cache the value.