BI-22377 druid加上-DfrDruidLogActiveCount=true可打印activecount的堆栈

fine-druid/src/com/fr/third/alibaba/druid/pool/DruidDataSource.java

@@ -15,42 +15,6 @@
  */
 package com.fr.third.alibaba.druid.pool;
 
-import java.io.Closeable;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.ConcurrentModificationException;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Properties;
-import java.util.ServiceLoader;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.ScheduledFuture;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
-
-import javax.management.JMException;
-import javax.management.MBeanRegistration;
-import javax.management.MBeanServer;
-import javax.management.ObjectName;
-import javax.naming.NamingException;
-import javax.naming.Reference;
-import javax.naming.Referenceable;
-import javax.naming.StringRefAddr;
-import javax.sql.ConnectionEvent;
-import javax.sql.ConnectionEventListener;
-import javax.sql.ConnectionPoolDataSource;
-import javax.sql.PooledConnection;
-
 import com.fr.third.alibaba.druid.Constants;
 import com.fr.third.alibaba.druid.TransactionTimeoutException;
 import com.fr.third.alibaba.druid.VERSION;
@@ -94,6 +58,41 @@ import com.fr.third.alibaba.druid.util.Utils;
 import com.fr.third.alibaba.druid.wall.WallFilter;
 import com.fr.third.alibaba.druid.wall.WallProviderStatValue;
 
+import javax.management.JMException;
+import javax.management.MBeanRegistration;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+import javax.naming.NamingException;
+import javax.naming.Reference;
+import javax.naming.Referenceable;
+import javax.naming.StringRefAddr;
+import javax.sql.ConnectionEvent;
+import javax.sql.ConnectionEventListener;
+import javax.sql.ConnectionPoolDataSource;
+import javax.sql.PooledConnection;
+import java.io.Closeable;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.ConcurrentModificationException;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.ServiceLoader;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
 /**
  * @author ljw [ljw2083@alibaba-inc.com]
  * @author wenshao [szujobs@hotmail.com]
@@ -167,6 +166,8 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
 
     private volatile boolean                 keepAlive               = false;
 
+    private static final boolean logActiveCount = "true".equals(System.getProperty("frDruidLogActiveCount"));
+
     public DruidDataSource(){
         this(false);
     }
@@ -1166,6 +1167,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
         lock.lock();
         try {
             activeCount--;
+            logActiveCount(false);
             discardCount++;
 
             if (activeCount <= minIdle) {
@@ -1217,6 +1219,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
 
             if (holder != null) {
                 activeCount++;
+                logActiveCount(true);
                 if (activeCount > activePeak) {
                     activePeak = activeCount;
                     activePeakTime = System.currentTimeMillis();
@@ -1406,6 +1409,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                     lock.lock();
                     try {
                         activeCount--;
+                        logActiveCount(false);
                         closeCount++;
                     } finally {
                         lock.unlock();
@@ -1424,6 +1428,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
             lock.lockInterruptibly();
             try {
                 activeCount--;
+                logActiveCount(false);
                 closeCount++;
 
                 result = putLast(holder, lastActiveTimeMillis);
@@ -3124,4 +3129,12 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
     public boolean isClosed() {
         return this.closed;
     }
+
+    private void logActiveCount(boolean isIncrease){
+        if (logActiveCount){
+            System.out.println("activeCount " + (isIncrease ? "increase" : "decrease"));
+            System.out.println("current count is " + activeCount);
+            new Throwable().printStackTrace();
+        }
+    }
 }