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Ultimate JDBC Connection Pool
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/*
 * Copyright (C) 2013, 2014 Brett Wooldridge
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.zaxxer.hikari.pool;

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A Runnable that is scheduled in the future to report leaks.  The ScheduledFuture is
 * cancelled if the connection is closed before the leak time expires.
 *
 * @author Brett Wooldridge
 */
class ProxyLeakTask implements Runnable
{
   private static final Logger LOGGER = LoggerFactory.getLogger(ProxyLeakTask.class);
   private static final ProxyLeakTask NO_LEAK;

   private ScheduledExecutorService executorService;
   private long leakDetectionThreshold;
   private ScheduledFuture scheduledFuture;
   private String connectionName;
   private Exception exception;
   private boolean isLeaked;

   static
   {
      NO_LEAK = new ProxyLeakTask() {
         @Override
         public void cancel() {}
      };
   }

   ProxyLeakTask(final long leakDetectionThreshold, final ScheduledExecutorService executorService)
   {
      this.executorService = executorService;
      this.leakDetectionThreshold = leakDetectionThreshold;
   }

   private ProxyLeakTask(final ProxyLeakTask parent, final PoolEntry poolEntry)
   {
      this.exception = new Exception("Apparent connection leak detected");
      this.connectionName = poolEntry.connection.toString();
      scheduledFuture = parent.executorService.schedule(this, parent.leakDetectionThreshold, TimeUnit.MILLISECONDS);
   }

   private ProxyLeakTask()
   {
   }
   
   ProxyLeakTask schedule(final PoolEntry bagEntry)
   {
      return (leakDetectionThreshold == 0) ? NO_LEAK : new ProxyLeakTask(this, bagEntry);
   }

   void updateLeakDetectionThreshold(final long leakDetectionThreshold)
   {
      this.leakDetectionThreshold = leakDetectionThreshold;
   }

   /** {@inheritDoc} */
   @Override
   public void run()
   {
      isLeaked = true;

      final StackTraceElement[] stackTrace = exception.getStackTrace(); 
      final StackTraceElement[] trace = new StackTraceElement[stackTrace.length - 5];
      System.arraycopy(stackTrace, 5, trace, 0, trace.length);

      exception.setStackTrace(trace);
      LOGGER.warn("Connection leak detection triggered for {}, stack trace follows", connectionName, exception);
   }

   void cancel()
   {
      scheduledFuture.cancel(false);
      if (isLeaked) {
         LOGGER.info("Previously reported leaked connection {} was returned to the pool (unleaked)", connectionName);
      }
   }
}