ThreadLocalUtil

gistfile1.java

public class ThreadLocalUtil {

    private final static ThreadLocal<ThreadVariables> THREAD_VARIABLES = new ThreadLocal<ThreadVariables>() {

        /**
         * @see java.lang.ThreadLocal#initialValue()
         */
        @Override
        protected ThreadVariables initialValue() {
            return new ThreadVariables();
        }
    };

    public static Object getThreadVariable(String name) {
        return THREAD_VARIABLES.get().get(name);
    }

    public static Object getThreadVariable(String name, InitialValue initialValue) {
        Object o = THREAD_VARIABLES.get().get(name);
        if (o == null) { 
            THREAD_VARIABLES.get().put(name, initialValue.create());
            return getThreadVariable(name);
        } else {
            return o;
        }
    }

    public static void setThreadVariable(String name, Object value) {
        THREAD_VARIABLES.get().put(name, value);
    }

    public static void destroy() {
        THREAD_VARIABLES.remove();
    }
}

public class ThreadVariables extends HashMap<String, Object> { }

public abstract class InitialValue {

    public abstract Object create();

}

Simple and Elegant - thanks for sharing.

Hi Niklas,

Good job! I'm going to reuse your idea in Ozark - Java EE MVC RI. Hope that you don't have any objections for this.

Regards,
Dmytro