AJ-542: add simple connection pool with connection count

Author: lucaijun

src/com/xxdb/SimpleDBConnectionPool.java

@@ -57,14 +57,18 @@ else if (Objects.nonNull(connectionPool)) {
         }
     }
 
-    public int getActiveConnections() {
+    public int getActiveConnectionsCount() {
         return connectionPool.getCount(false);
     }
 
-    public int getIdleConnections() {
+    public int getIdleConnectionsCount() {
         return connectionPool.getCount(true);
     }
 
+    public int getTotalConnectionsCount() {
+        return connectionPool.getTotalCount();
+    }
+
     public void close() {
         if (Objects.nonNull(connectionPool))
             connectionPool.close();
@@ -119,6 +123,10 @@ int getCount(boolean isIdle) {
             return count;
         }
 
+        int getTotalCount() {
+            return poolEntries.size();
+        }
+
         void close() {
             if (!this.isShutdown.getAndSet(true)) {
                 log.info("Closing the connection pool......");