Set the on the ThreadLocal instance - Java java.lang

Java examples for java.lang:ThreadLocal

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Description

Set the on the ThreadLocal instance

Demo Code


import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpSession;

public class Main{
    public static void main(String[] argv) throws Exception{
        String key = "java2s.com";
        Object value = "java2s.com";
        set(key,value);/*  w ww.  j  a v a 2  s  . c  o m*/
    }
    private static ThreadLocal<Map<String, Object>> threadLocal = new ThreadLocal<Map<String, Object>>();
    /**
     * Set the <key,value> on the {@link ThreadLocal} instance
     * @param key
     * @param value
     */
    public static void set(String key, Object value) {

        Map<String, Object> mapOfObjects = null;

        //this is the firstTime for this Thread!
        if (threadLocal.get() == null) {
            mapOfObjects = new HashMap<String, Object>();
            threadLocal.set(mapOfObjects);
        }

        ((Map<String, Object>) threadLocal.get()).put(key, value);
    }
    /**
     * Get the value of the key set from the {@link ThreadLocal} instance
     * @param key
     * @return
     */
    public static Object get(String key) {
        if (threadLocal.get() == null) {
            return null;
        }

        return ((Map<String, Object>) threadLocal.get()).get(key);
    }
}

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