feature:add active test flag

src/main/java/org/csource/fastdfs/pool/Connection.java

@@ -15,6 +15,8 @@ public class Connection {
     private InetSocketAddress inetSockAddr;
     private Long lastAccessTime = System.currentTimeMillis();
 
+    private boolean needActiveTest = false;
+
     public Connection(Socket sock, InetSocketAddress inetSockAddr) {
         this.sock = sock;
         this.inetSockAddr = inetSockAddr;
@@ -117,11 +119,21 @@ public class Connection {
         return false;
     }
 
+    public boolean isNeedActiveTest() {
+        return needActiveTest;
+    }
+
+    public void setNeedActiveTest(boolean needActiveTest) {
+        this.needActiveTest = needActiveTest;
+    }
+
     @Override
     public String toString() {
-        return "TrackerServer{" +
+        return "Connection{" +
                 "sock=" + sock +
                 ", inetSockAddr=" + inetSockAddr +
+                ", lastAccessTime=" + lastAccessTime +
+                ", needActiveTest=" + needActiveTest +
                 '}';
     }
 }

src/main/java/org/csource/fastdfs/pool/ConnectionManager.java

@@ -57,6 +57,16 @@ public class ConnectionManager {
                         closeConnection(connection);
                         continue;
                     }
+                    if (connection.isNeedActiveTest()) {
+                        boolean isActive = false;
+                        try {
+                            isActive = connection.activeTest();
+                        } catch (IOException e) {
+                            System.err.println("send to server[" + inetSocketAddress.getAddress().getHostAddress() + ":" + inetSocketAddress.getPort() + "] active test error ,emsg:" + e.getMessage());
+                            isActive = false;
+                        }
+                        if (!isActive) continue;
+                    }
                 } else if (ClientGlobal.g_connection_pool_max_count_per_entry == 0 || totalCount.get() < ClientGlobal.g_connection_pool_max_count_per_entry) {
                     connection = ConnectionFactory.create(this.inetSocketAddress);
                     totalCount.incrementAndGet();
@@ -107,6 +117,20 @@ public class ConnectionManager {
         }
     }
 
+    public void setActiveTestFlag() {
+        if (freeCount.get() > 0) {
+            lock.lock();
+            try {
+                for (Connection freeConnection : freeConnections) {
+                    freeConnection.setNeedActiveTest(true);
+                }
+            } finally {
+                lock.unlock();
+            }
+        }
+    }
+
+
     @Override
     public String toString() {
         return "ConnectionManager{" +

src/main/java/org/csource/fastdfs/pool/ConnectionPool.java

@@ -54,6 +54,7 @@ public class ConnectionPool {
         ConnectionManager connectionManager = CP.get(key);
         if (connectionManager != null) {
             connectionManager.closeConnection(connection);
+            connectionManager.setActiveTestFlag();
         } else {
             connection.closeDirectly();
         }