Local.java

package kr.debop4j.core;

import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;

import static kr.debop4j.core.Guard.shouldNotBeNull;


/**
 * Thread Context 별로 격리된 저장소를 제공합니다.
 *
 * @author [email protected]
 * @since 12. 9. 12
 */
public class Local {

    private static final Logger log = LoggerFactory.getLogger(Local.class);

    private Local() { }

    private static ThreadLocal<HashMap> threadLocal =
            new ThreadLocal<HashMap>() {
                @Override
                public HashMap initialValue() {
                    log.debug("현 ThreadContext 에 저장소를 생성합니다...");
                    return Maps.newLinkedHashMap();
                }
            };

    private static HashMap getMap() {
        return threadLocal.get();
    }

    public static Object get(Object key) {
        shouldNotBeNull(key, "key");
        return threadLocal.get().get(key);
    }

    @SuppressWarnings("unchecked")
    public static <T> T get(Object key, Class<T> clazz) {
        assert key != null;
        return (T) threadLocal.get().get(key);
    }

    @SuppressWarnings("unchecked")
    public static void put(Object key, Object value) {
        assert key != null;

        if (log.isTraceEnabled())
            log.trace("Local 저장소에 key=[{}], value=[{}]를 저장합니다.", key, value);

        threadLocal.get().put(key, value);
    }

    public static void clear() {
        threadLocal.get().clear();
        log.debug("Local 저장소의 모든 정보를 삭제했습니다.");
    }
}