fix:移除 LruCache 多余的同步块 (#601)

fix:移除 LruCache 多余的同步块

dubbo-filter/dubbo-filter-cache/src/main/java/com/alibaba/dubbo/cache/support/lru/LruCache.java

@@ -19,9 +19,7 @@ import com.alibaba.dubbo.cache.Cache;
 import com.alibaba.dubbo.common.URL;
 import com.alibaba.dubbo.common.utils.LRUCache;
 
-import java.util.LinkedHashMap;
 import java.util.Map;
-import java.util.Map.Entry;
 
 /**
  * LruCache
@@ -34,19 +32,15 @@ public class LruCache implements Cache {
 
     public LruCache(URL url) {
         final int max = url.getParameter("cache.size", 1000);
-        this.store = new LRUCache<Object,Object>(max);
+        this.store = new LRUCache<Object, Object>(max);
     }
 
     public void put(Object key, Object value) {
-        synchronized (store) {
-            store.put(key, value);
-        }
+        store.put(key, value);
     }
 
     public Object get(Object key) {
-        synchronized (store) {
-            return store.get(key);
-        }
+        return store.get(key);
     }
 
 }