fix: the timing of obtaining the number of waiting threads in the connection pool is wrong

Author: LUAgam

src/main/java/com/actiontech/dble/backend/pool/ConnectionPool.java

@@ -80,9 +80,10 @@ public PooledConnection borrowDirectly(final String schema) {
         try {
             ConnectionPoolProvider.getConnGetFrenshLocekAfter();
             ConnectionPoolProvider.borrowDirectlyConnectionBefore();
-            int waiting = waiters.get();
             for (PooledConnection conn : allConnections) {
                 if (conn.compareAndSet(STATE_NOT_IN_USE, STATE_IN_USE)) {
+                    final int waiting = waiterNum;
+                    ConnectionPoolProvider.getWaiterCountAfter();
                     if (waiting > 0 && conn.getCreateByWaiter().compareAndSet(true, false)) {
                         ConnectionPoolProvider.newConnectionBorrowDirectly();
                         newPooledEntry(schema, waiting, true);
@@ -102,12 +103,12 @@ public PooledConnection borrow(final String schema, long timeout, final TimeUnit
             freshLock.readLock().lock();
         }
         try {
-            final int waiting = waiterNum;
             ConnectionPoolProvider.getConnGetFrenshLocekAfter();
             ConnectionPoolProvider.borrowConnectionBefore();
             for (PooledConnection conn : allConnections) {
                 if (conn.compareAndSet(STATE_NOT_IN_USE, STATE_IN_USE)) {
                     // If we may have stolen another waiter's connection, request another bag add.
+                    final int waiting = waiterNum;
                     if (waiting > 0 && conn.getCreateByWaiter().compareAndSet(true, false)) {
                         ConnectionPoolProvider.newConnectionBorrow0();
                         newPooledEntry(schema, waiting, true);

src/main/java/com/actiontech/dble/btrace/provider/ConnectionPoolProvider.java

@@ -51,5 +51,9 @@ public static void fillPool() {
 
     }
 
+    public static void getWaiterCountAfter() {
+
+    }
+
 
 }