/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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 org.apache.ibatis.datasource.pooled;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author Clinton Begin
   */
  public class PoolState {
  
    protected PooledDataSource dataSource;
  
    protected final List<PooledConnection> idleConnections = new ArrayList<>();
    protected final List<PooledConnection> activeConnections = new ArrayList<>();
    protected long requestCount = 0;
    protected long accumulatedRequestTime = 0;
    protected long accumulatedCheckoutTime = 0;
    protected long claimedOverdueConnectionCount = 0;
    protected long accumulatedCheckoutTimeOfOverdueConnections = 0;
    protected long accumulatedWaitTime = 0;
    protected long hadToWaitCount = 0;
    protected long badConnectionCount = 0;
  
    public PoolState(PooledDataSource dataSource) {
      this.dataSource = dataSource;
    }
  
    public synchronized long getRequestCount() {
      return requestCount;
    }
  
    public synchronized long getAverageRequestTime() {
      return requestCount == 0 ? 0 : accumulatedRequestTime / requestCount;
    }
  
    public synchronized long getAverageWaitTime() {
      return hadToWaitCount == 0 ? 0 : accumulatedWaitTime / hadToWaitCount;
  
    }
  
    public synchronized long getHadToWaitCount() {
      return hadToWaitCount;
    }
  
    public synchronized long getBadConnectionCount() {
      return badConnectionCount;
    }
  
    public synchronized long getClaimedOverdueConnectionCount() {
      return claimedOverdueConnectionCount;
    }
  
    public synchronized long getAverageOverdueCheckoutTime() {
      return claimedOverdueConnectionCount == 0 ? 0 : accumulatedCheckoutTimeOfOverdueConnections / claimedOverdueConnectionCount;
    }
  
    public synchronized long getAverageCheckoutTime() {
      return requestCount == 0 ? 0 : accumulatedCheckoutTime / requestCount;
    }
  
    public synchronized int getIdleConnectionCount() {
      return idleConnections.size();
    }
  
    public synchronized int getActiveConnectionCount() {
      return activeConnections.size();
    }
  
    @Override
    public synchronized String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append("\n===CONFIGURATION==============================================");
      builder.append("\n jdbcDriver                     ").append(dataSource.getDriver());
      builder.append("\n jdbcUrl                        ").append(dataSource.getUrl());
      builder.append("\n jdbcUsername                   ").append(dataSource.getUsername());
      builder.append("\n jdbcPassword                   ").append(dataSource.getPassword() == null ? "NULL" : "************");
      builder.append("\n poolMaxActiveConnections       ").append(dataSource.poolMaximumActiveConnections);
      builder.append("\n poolMaxIdleConnections         ").append(dataSource.poolMaximumIdleConnections);
      builder.append("\n poolMaxCheckoutTime            ").append(dataSource.poolMaximumCheckoutTime);
      builder.append("\n poolTimeToWait                 ").append(dataSource.poolTimeToWait);
      builder.append("\n poolPingEnabled                ").append(dataSource.poolPingEnabled);
      builder.append("\n poolPingQuery                  ").append(dataSource.poolPingQuery);
      builder.append("\n poolPingConnectionsNotUsedFor  ").append(dataSource.poolPingConnectionsNotUsedFor);
      builder.append("\n ---STATUS-----------------------------------------------------");
     builder.append("\n activeConnections              ").append(getActiveConnectionCount());
     builder.append("\n idleConnections                ").append(getIdleConnectionCount());
     builder.append("\n requestCount                   ").append(getRequestCount());
     builder.append("\n averageRequestTime             ").append(getAverageRequestTime());
     builder.append("\n averageCheckoutTime            ").append(getAverageCheckoutTime());
     builder.append("\n claimedOverdue                 ").append(getClaimedOverdueConnectionCount());
     builder.append("\n averageOverdueCheckoutTime     ").append(getAverageOverdueCheckoutTime());
     builder.append("\n hadToWait                      ").append(getHadToWaitCount());
     builder.append("\n averageWaitTime                ").append(getAverageWaitTime());
     builder.append("\n badConnectionCount             ").append(getBadConnectionCount());
     builder.append("\n===============================================================");
     return builder.toString();
   }
 
 }