recycle add physicalConnection closed check.

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -1660,6 +1660,17 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                 return;
             }
 
+            if (physicalConnection.isClosed()) {
+                lock.lock();
+                try {
+                    activeCount--;
+                    closeCount++;
+                } finally {
+                    lock.unlock();
+                }
+                return;
+            }
+
             if (testOnReturn) {
                 boolean validate = testConnectionInternal(holder, physicalConnection);
                 if (!validate) {
@@ -1686,14 +1697,6 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
             boolean result;
             final long lastActiveTimeMillis = System.currentTimeMillis();
             lock.lock();
-//            ====== begin =======
-//            lockInterruptibly的实现有如下问题:
-//            会导致当前线程被Interrupt时,holder无法正常被回收
-//            因此改成 lock.lock();
-//            comment by wubiliang(未立)
-//            原来的代码是
-//            lock.lockInterruptibly();
-//          ====== end =======
             try {
                 activeCount--;
                 closeCount++;