content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.druid.pool;
  
  import com.alibaba.druid.filter.Filter;
  import com.alibaba.druid.filter.FilterChain;
  import com.alibaba.druid.filter.FilterChainImpl;
  import com.alibaba.druid.pool.DruidPooledPreparedStatement.PreparedStatementKey;
  import com.alibaba.druid.pool.PreparedStatementPool.MethodType;
  import com.alibaba.druid.proxy.jdbc.TransactionInfo;
  import com.alibaba.druid.support.logging.Log;
  import com.alibaba.druid.support.logging.LogFactory;
  import com.alibaba.druid.util.JdbcUtils;
  
  import javax.sql.ConnectionEvent;
  import javax.sql.ConnectionEventListener;
  import javax.sql.StatementEventListener;
  
  import java.sql.*;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  import java.util.concurrent.Executor;
  import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
  import java.util.concurrent.locks.ReentrantLock;
  
  /**
   * @author wenshao [szujobs@hotmail.com]
   */
  public class DruidPooledConnection extends PoolableWrapper implements javax.sql.PooledConnection, Connection {
      private static final Log LOG = LogFactory.getLog(DruidPooledConnection.class);
      public static final int MAX_RECORD_SQL_COUNT = 10;
      protected Connection conn;
      protected volatile DruidConnectionHolder holder;
      protected TransactionInfo transactionInfo;
      private final boolean dupCloseLogEnable;
      protected volatile boolean traceEnable;
      protected volatile boolean disable;
      protected volatile boolean closed;
      static AtomicIntegerFieldUpdater CLOSING_UPDATER = AtomicIntegerFieldUpdater.newUpdater(DruidPooledConnection.class, "closing");
      protected final Thread ownerThread;
      private long connectedTimeMillis;
      private long connectedTimeNano;
      private volatile boolean running;
      private volatile boolean abandoned;
      protected StackTraceElement[] connectStackTrace;
      protected Throwable disableError;
      final ReentrantLock lock;
      protected volatile int closing;
      protected FilterChain filterChain;
  
      public DruidPooledConnection(DruidConnectionHolder holder) {
          super(holder.getConnection());
  
          this.conn = holder.getConnection();
          this.holder = holder;
          this.lock = holder.lock;
          dupCloseLogEnable = holder.getDataSource().isDupCloseLogEnable();
          ownerThread = Thread.currentThread();
          connectedTimeMillis = System.currentTimeMillis();
      }
  
      public long getConnectedTimeMillis() {
          return connectedTimeMillis;
      }
  
      public Thread getOwnerThread() {
          return ownerThread;
      }
  
      public StackTraceElement[] getConnectStackTrace() {
          return connectStackTrace;
      }
  
      public void setConnectStackTrace(StackTraceElement[] connectStackTrace) {
          this.connectStackTrace = connectStackTrace;
      }
  
      public long getConnectedTimeNano() {
          return connectedTimeNano;
      }
  
      public void setConnectedTimeNano() {
          if (connectedTimeNano <= 0) {
              this.setConnectedTimeNano(System.nanoTime());
          }
      }
  
      public void setConnectedTimeNano(long connectedTimeNano) {
          this.connectedTimeNano = connectedTimeNano;
      }
  
      public boolean isTraceEnable() {
          return traceEnable;
      }
  
      public void setTraceEnable(boolean traceEnable) {
          this.traceEnable = traceEnable;
      }
  
      public SQLException handleException(Throwable t) throws SQLException {
          return handleException(t, null);
      }
  
      public SQLException handleException(Throwable t, String sql) throws SQLException {
          final DruidConnectionHolder holder = this.holder;
  
          //
          if (holder != null) {
              DruidAbstractDataSource dataSource = holder.getDataSource();
              dataSource.handleConnectionException(this, t, sql);
          }
  
          if (t instanceof SQLException) {
              throw (SQLException) t;
          }
  
          throw new SQLException("Error", t);
      }
  
      public boolean isOracle() {
          return holder.getDataSource().isOracle();
      }
  
      public void closePoolableStatement(DruidPooledPreparedStatement stmt) throws SQLException {
          PreparedStatement rawStatement = stmt.stmt;
  
          final DruidConnectionHolder holder = this.holder;
          if (holder == null) {
              return;
          }
  
          if (stmt.pooled) {
              try {
                  rawStatement.clearParameters();
              } catch (SQLException ex) {
                  this.handleException(ex, null);
                  if (rawStatement.getConnection().isClosed()) {
                      return;
                  }
  
                  LOG.error("clear parameter error", ex);
              }
  
              try {
                  rawStatement.clearBatch();
              } catch (SQLException ex) {
                  this.handleException(ex, null);
                  if (rawStatement.getConnection().isClosed()) {
                      return;
                  }
  
                  LOG.error("clear batch error", ex);
              }
          }
  
          PreparedStatementHolder stmtHolder = stmt.holder;
          stmtHolder.inUseCount--;
          if (stmt.pooled && holder.dataSource.poolPreparedStatements && stmt.exceptionCount == 0) {
              holder.getStatementPool().put(stmtHolder);
  
              stmt.clearResultSet();
              holder.removeTrace(stmt);
  
              stmtHolder.setFetchRowPeak(stmt.getFetchRowPeak());
  
              stmt.setClosed(true); // soft set close
          } else if (stmt.pooled && holder.dataSource.poolPreparedStatements) {
              // the PreparedStatement threw an exception
              stmt.clearResultSet();
              holder.removeTrace(stmt);
  
              holder.getStatementPool()
                      .remove(stmtHolder);
          } else {
              try {
                  //Connection behind the statement may be in invalid state, which will throw a SQLException.
                  //In this case, the exception is desired to be properly handled to remove the unusable connection from the pool.
                  stmt.closeInternal();
              } catch (SQLException ex) {
                  this.handleException(ex, null);
                  throw ex;
              } finally {
                  holder.dataSource.incrementClosedPreparedStatementCount();
              }
          }
      }
  
      public DruidConnectionHolder getConnectionHolder() {
          return holder;
      }
  
      @Override
      public Connection getConnection() {
          if (!holder.underlyingAutoCommit) {
              createTransactionInfo();
          }
  
          return conn;
      }
  
      public void disable() {
          disable(null);
      }
  
      public void disable(Throwable error) {
          if (this.holder != null) {
              this.holder.clearStatementCache();
          }
  
          this.traceEnable = false;
          this.holder = null;
          this.transactionInfo = null;
          this.disable = true;
          this.disableError = error;
      }
  
      public boolean isDisable() {
          return disable;
      }
  
      @Override
      public void close() throws SQLException {
          if (this.disable) {
              return;
          }
  
          DruidConnectionHolder holder = this.holder;
          if (holder == null) {
              if (dupCloseLogEnable) {
                  LOG.error("dup close");
              }
              return;
          }
  
          DruidAbstractDataSource dataSource = holder.getDataSource();
          boolean isSameThread = this.ownerThread == Thread.currentThread();
  
          if (!isSameThread) {
              dataSource.setAsyncCloseConnectionEnable(true);
          }
  
          if (dataSource.removeAbandoned || dataSource.asyncCloseConnectionEnable) {
              syncClose();
              return;
          }
  
          if (!CLOSING_UPDATER.compareAndSet(this, 0, 1)) {
              return;
          }
  
          try {
              for (int i = 0; i < holder.connectionEventListeners.size(); i++) {
                  ConnectionEventListener listener = holder.connectionEventListeners.get(i);
                  listener.connectionClosed(new ConnectionEvent(this));
              }
  
              List<Filter> filters = dataSource.filters;
              int filtersSize = filters.size();
              if (filtersSize > 0) {
                  FilterChainImpl filterChain = holder.createChain();
                  try {
                      filterChain.dataSource_recycle(this);
                  } finally {
                      holder.recycleFilterChain(filterChain);
                  }
              } else {
                  recycle();
              }
          } finally {
              CLOSING_UPDATER.set(this, 0);
          }
  
          this.disable = true;
      }
  
      public void syncClose() throws SQLException {
          lock.lock();
          try {
              if (this.disable || CLOSING_UPDATER.get(this) != 0) {
                  return;
              }
  
              DruidConnectionHolder holder = this.holder;
              if (holder == null) {
                  if (dupCloseLogEnable) {
                      LOG.error("dup close");
                  }
                  return;
              }
  
              if (!CLOSING_UPDATER.compareAndSet(this, 0, 1)) {
                  return;
              }
  
              for (ConnectionEventListener listener : holder.connectionEventListeners) {
                  listener.connectionClosed(new ConnectionEvent(this));
              }
  
              DruidAbstractDataSource dataSource = holder.getDataSource();
              List<Filter> filters = dataSource.getProxyFilters();
              if (filters.size() > 0) {
                  FilterChainImpl filterChain = new FilterChainImpl(dataSource);
                  filterChain.dataSource_recycle(this);
              } else {
                  recycle();
              }
  
              this.disable = true;
          } finally {
              CLOSING_UPDATER.set(this, 0);
              lock.unlock();
          }
      }
  
      public void recycle() throws SQLException {
          if (this.disable) {
              return;
          }
  
          DruidConnectionHolder holder = this.holder;
          if (holder == null) {
              if (dupCloseLogEnable) {
                  LOG.error("dup close");
              }
              return;
          }
  
          if (!this.abandoned) {
              holder.dataSource.recycle(this);
          }
  
          this.holder = null;
          conn = null;
          transactionInfo = null;
          closed = true;
      }
  
      // ////////////////////
  
      @Override
      public PreparedStatement prepareStatement(String sql) throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M1);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      private void initStatement(PreparedStatementHolder stmtHolder) throws SQLException {
          stmtHolder.incrementInUseCount();
          holder.getDataSource().initStatement(this, stmtHolder.statement);
      }
  
      @Override
      public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
              throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M2, resultSetType,
                  resultSetConcurrency);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql, resultSetType,
                          resultSetConcurrency));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
                                                int resultSetHoldability) throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M3, resultSetType,
                  resultSetConcurrency, resultSetHoldability);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql, resultSetType,
                          resultSetConcurrency,
                          resultSetHoldability));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
          checkState();
  
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M4, columnIndexes);
          PreparedStatementHolder stmtHolder = null;
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql, columnIndexes));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
          checkState();
  
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M5, columnNames);
          PreparedStatementHolder stmtHolder = null;
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql, columnNames));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
          checkState();
  
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.M6, autoGeneratedKeys);
          PreparedStatementHolder stmtHolder = null;
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareStatement(sql, autoGeneratedKeys));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledPreparedStatement rtnVal = new DruidPooledPreparedStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      // ////////////////////
  
      @Override
      public CallableStatement prepareCall(String sql) throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.Precall_1);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareCall(sql));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledCallableStatement rtnVal = new DruidPooledCallableStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
                                           int resultSetHoldability) throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.Precall_2, resultSetType,
                  resultSetConcurrency, resultSetHoldability);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key, conn.prepareCall(sql, resultSetType,
                          resultSetConcurrency,
                          resultSetHoldability));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledCallableStatement rtnVal = new DruidPooledCallableStatement(this, stmtHolder);
  
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      @Override
      public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
          checkState();
  
          PreparedStatementHolder stmtHolder = null;
          PreparedStatementKey key = new PreparedStatementKey(sql, getCatalog(), MethodType.Precall_3, resultSetType,
                  resultSetConcurrency);
  
          boolean poolPreparedStatements = holder.isPoolPreparedStatements();
  
          if (poolPreparedStatements) {
              stmtHolder = holder.getStatementPool().get(key);
          }
  
          if (stmtHolder == null) {
              try {
                  stmtHolder = new PreparedStatementHolder(key,
                          conn.prepareCall(sql, resultSetType, resultSetConcurrency));
                  holder.getDataSource().incrementPreparedStatementCount();
              } catch (SQLException ex) {
                  handleException(ex, sql);
              }
          }
  
          initStatement(stmtHolder);
  
          DruidPooledCallableStatement rtnVal = new DruidPooledCallableStatement(this, stmtHolder);
          holder.addTrace(rtnVal);
  
          return rtnVal;
      }
  
      // ////////////////////
  
      @Override
      public Statement createStatement() throws SQLException {
          checkState();
  
          Statement stmt = null;
          try {
              stmt = conn.createStatement();
          } catch (SQLException ex) {
              handleException(ex, null);
          }
  
          holder.dataSource.initStatement(this, stmt);
  
          DruidPooledStatement poolableStatement = new DruidPooledStatement(this, stmt);
          holder.addTrace(poolableStatement);
  
          return poolableStatement;
      }
  
      @Override
      public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
              throws SQLException {
          checkState();
  
          Statement stmt = null;
          try {
              stmt = conn.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
  
          holder.dataSource.initStatement(this, stmt);
  
          DruidPooledStatement poolableStatement = new DruidPooledStatement(this, stmt);
          holder.addTrace(poolableStatement);
  
          return poolableStatement;
      }
  
      @Override
      public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
          checkState();
  
          Statement stmt = null;
          try {
              stmt = conn.createStatement(resultSetType, resultSetConcurrency);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
  
          holder.dataSource.initStatement(this, stmt);
  
          DruidPooledStatement poolableStatement = new DruidPooledStatement(this, stmt);
          holder.addTrace(poolableStatement);
  
          return poolableStatement;
      }
  
      @Override
      public String nativeSQL(String sql) throws SQLException {
          checkState();
  
          return conn.nativeSQL(sql);
      }
  
      @Override
      public void setAutoCommit(boolean autoCommit) throws SQLException {
          checkState();
  
          boolean useLocalSessionState = holder.getDataSource().isUseLocalSessionState();
  
          if (useLocalSessionState) {
              if (autoCommit == holder.underlyingAutoCommit) {
                  return;
              }
          }
  
          try {
              conn.setAutoCommit(autoCommit);
              holder.setUnderlyingAutoCommit(autoCommit);
              holder.setLastExecTimeMillis(System.currentTimeMillis());
          } catch (SQLException ex) {
              handleException(ex, null);
          }
      }
  
      protected void transactionRecord(String sql) throws SQLException {
          if (holder != null) {
              holder.setLastExecTimeMillis(System.currentTimeMillis());
          }
  
          if (transactionInfo == null && (!conn.getAutoCommit())) {
              DruidAbstractDataSource dataSource = holder.getDataSource();
              dataSource.incrementStartTransactionCount();
              transactionInfo = new TransactionInfo(dataSource.createTransactionId());
          }
  
          if (transactionInfo != null) {
              List<String> sqlList = transactionInfo.getSqlList();
              if (sqlList.size() < MAX_RECORD_SQL_COUNT) {
                  sqlList.add(sql);
              }
          }
      }
  
      @Override
      public boolean getAutoCommit() throws SQLException {
          checkState();
  
          return conn.getAutoCommit();
      }
  
      @Override
      public void commit() throws SQLException {
          checkState();
  
          DruidAbstractDataSource dataSource = holder.getDataSource();
          dataSource.incrementCommitCount();
  
          try {
              conn.commit();
          } catch (SQLException ex) {
              handleException(ex, null);
          } finally {
              handleEndTransaction(dataSource, null);
          }
      }
  
      public TransactionInfo getTransactionInfo() {
          return transactionInfo;
      }
  
      protected void createTransactionInfo() {
          DruidAbstractDataSource dataSource = holder.getDataSource();
          dataSource.incrementStartTransactionCount();
          transactionInfo = new TransactionInfo(dataSource.createTransactionId());
      }
  
      @Override
      public void rollback() throws SQLException {
          if (transactionInfo == null) {
              return;
          }
  
          if (holder == null) {
              return;
          }
  
          DruidAbstractDataSource dataSource = holder.getDataSource();
          dataSource.incrementRollbackCount();
  
          try {
              conn.rollback();
          } catch (SQLException ex) {
              handleException(ex, null);
          } finally {
              handleEndTransaction(dataSource, null);
          }
      }
  
      @Override
      public Savepoint setSavepoint(String name) throws SQLException {
          checkState();
  
          try {
              return conn.setSavepoint(name);
          } catch (SQLException ex) {
              handleException(ex, null);
              return null; // never arrive
          }
      }
  
      @Override
      public void rollback(Savepoint savepoint) throws SQLException {
          if (holder == null) {
              return;
          }
  
          DruidAbstractDataSource dataSource = holder.getDataSource();
          dataSource.incrementRollbackCount();
  
          try {
              conn.rollback(savepoint);
          } catch (SQLException ex) {
              handleException(ex, null);
          } finally {
              handleEndTransaction(dataSource, savepoint);
          }
      }
  
      private void handleEndTransaction(DruidAbstractDataSource dataSource, Savepoint savepoint) {
          if (transactionInfo != null && savepoint == null) {
              transactionInfo.setEndTimeMillis();
  
              long transactionMillis = transactionInfo.getEndTimeMillis() - transactionInfo.getStartTimeMillis();
              dataSource.getTransactionHistogram().record(transactionMillis);
  
              dataSource.logTransaction(transactionInfo);
  
              transactionInfo = null;
          }
      }
  
      @Override
      public void releaseSavepoint(Savepoint savepoint) throws SQLException {
          checkState();
          try {
              conn.releaseSavepoint(savepoint);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
      }
  
      @Override
      public Clob createClob() throws SQLException {
          checkState();
  
          try {
              return conn.createClob();
          } catch (SQLException ex) {
              handleException(ex, null);
              return null; // never arrive
          }
      }
  
      @Override
      public boolean isClosed() throws SQLException {
          return holder == null || closed || disable;
      }
  
      public boolean isAbandonded() {
          return this.abandoned;
      }
  
      @Override
      public DatabaseMetaData getMetaData() throws SQLException {
          checkState();
  
          if (!holder.underlyingAutoCommit) {
              createTransactionInfo();
          }
  
          return conn.getMetaData();
      }
  
      @Override
      public void setReadOnly(boolean readOnly) throws SQLException {
          checkState();
  
          boolean useLocalSessionState = holder.getDataSource().isUseLocalSessionState();
          if (useLocalSessionState) {
              if (readOnly == holder.isUnderlyingReadOnly()) {
                  return;
              }
          }
  
          try {
              conn.setReadOnly(readOnly);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
  
          holder.setUnderlyingReadOnly(readOnly);
      }
  
      @Override
      public boolean isReadOnly() throws SQLException {
          checkState();
  
          return conn.isReadOnly();
      }
  
      @Override
      public void setCatalog(String catalog) throws SQLException {
          checkState();
  
          try {
              conn.setCatalog(catalog);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
      }
  
      @Override
      public String getCatalog() throws SQLException {
          checkState();
  
          return conn.getCatalog();
      }
  
      @Override
      public void setTransactionIsolation(int level) throws SQLException {
          checkState();
  
          boolean useLocalSessionState = holder.getDataSource().isUseLocalSessionState();
          if (useLocalSessionState) {
              if (level == holder.getUnderlyingTransactionIsolation()) {
                  return;
              }
          }
  
          try {
              conn.setTransactionIsolation(level);
          } catch (SQLException ex) {
              handleException(ex, null);
          }
          holder.setUnderlyingTransactionIsolation(level);
      }
  
      @Override
      public int getTransactionIsolation() throws SQLException {
          checkState();
  
          return holder.getUnderlyingTransactionIsolation();
      }
  
      @Override
      public SQLWarning getWarnings() throws SQLException {
          checkState();
  
          return conn.getWarnings();
      }
  
      @Override
      public void clearWarnings() throws SQLException {
          checkState();
          try {
              conn.clearWarnings();
          } catch (SQLException ex) {
              handleException(ex, null);
          }
      }
  
      @Override
      public Map<String, Class<?>> getTypeMap() throws SQLException {
          checkState();
  
          return conn.getTypeMap();
      }
  
      @Override
      public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
          checkState();
  
          conn.setTypeMap(map);
      }
  
      @Override
      public void setHoldability(int holdability) throws SQLException {
          checkState();
  
          boolean useLocalSessionState = holder.getDataSource().isUseLocalSessionState();
          if (useLocalSessionState) {
              if (holdability == holder.getUnderlyingHoldability()) {
                  return;
              }
          }
  
          conn.setHoldability(holdability);
          holder.setUnderlyingHoldability(holdability);
      }
  
      @Override
      public int getHoldability() throws SQLException {
          checkState();
  
          if (!holder.underlyingAutoCommit) {
              createTransactionInfo();
          }
  
          return conn.getHoldability();
      }
  
      @Override
      public Savepoint setSavepoint() throws SQLException {
          checkState();
  
          try {
              return conn.setSavepoint();
          } catch (SQLException ex) {
              handleException(ex, null);
              return null;
          }
      }
  
      @Override
      public Blob createBlob() throws SQLException {
          checkState();
  
          return conn.createBlob();
      }
  
      @Override
      public NClob createNClob() throws SQLException {
          checkState();
  
          return conn.createNClob();
      }
  
      @Override
      public SQLXML createSQLXML() throws SQLException {
          checkState();
  
          return conn.createSQLXML();
      }
  
      @Override
      public boolean isValid(int timeout) throws SQLException {
          checkState();
  
          return conn.isValid(timeout);
      }
  
      @Override
      public void setClientInfo(String name, String value) throws SQLClientInfoException {
          if (holder == null) {
              throw new SQLClientInfoException();
          }
  
          conn.setClientInfo(name, value);
      }
  
      @Override
      public void setClientInfo(Properties properties) throws SQLClientInfoException {
          if (holder == null) {
              throw new SQLClientInfoException();
          }
  
          conn.setClientInfo(properties);
      }
  
      @Override
      public String getClientInfo(String name) throws SQLException {
          checkState();
  
          return conn.getClientInfo(name);
      }
  
      @Override
      public Properties getClientInfo() throws SQLException {
          checkState();
  
          return conn.getClientInfo();
      }
  
      @Override
      public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
          checkState();
  
          return conn.createArrayOf(typeName, elements);
      }
  
      @Override
      public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
          checkState();
  
          return conn.createStruct(typeName, attributes);
      }
  
      @Override
      public void addConnectionEventListener(ConnectionEventListener listener) {
          if (holder == null) {
              throw new IllegalStateException();
          }
  
          holder.getConnectionEventListeners().add(listener);
      }
  
      @Override
      public void removeConnectionEventListener(ConnectionEventListener listener) {
          if (holder == null) {
              throw new IllegalStateException();
          }
  
          holder.getConnectionEventListeners().remove(listener);
      }
  
      @Override
      public void addStatementEventListener(StatementEventListener listener) {
          if (holder == null) {
              throw new IllegalStateException();
          }
  
          holder.getStatementEventListeners().add(listener);
      }
  
      @Override
      public void removeStatementEventListener(StatementEventListener listener) {
          if (holder == null) {
              throw new IllegalStateException();
          }
  
          holder.getStatementEventListeners().remove(listener);
      }
  
      public Throwable getDisableError() {
          return disableError;
      }
  
      public void checkState() throws SQLException {
          final boolean asyncCloseEnabled;
          if (holder != null) {
              asyncCloseEnabled = holder.dataSource.isAsyncCloseConnectionEnable();
          } else {
              asyncCloseEnabled = false;
          }
  
          if (asyncCloseEnabled) {
              lock.lock();
              try {
                  checkStateInternal();
              } finally {
                  lock.unlock();
              }
          } else {
              checkStateInternal();
          }
      }
  
      private void checkStateInternal() throws SQLException {
          if (closed) {
              if (disableError != null) {
                  throw new SQLException("connection closed", disableError);
              } else {
                  throw new SQLException("connection closed");
              }
          }
  
          if (disable) {
              if (disableError != null) {
                  throw new SQLException("connection disabled", disableError);
              } else {
                  throw new SQLException("connection disabled");
              }
          }
  
          if (holder == null) {
              if (disableError != null) {
                  throw new SQLException("connection holder is null", disableError);
              } else {
                  throw new SQLException("connection holder is null");
              }
          }
      }
  
      public String toString() {
          if (conn != null) {
              return conn.toString();
          } else {
              return "closed-conn-" + System.identityHashCode(this);
          }
      }
  
      public void setSchema(String schema) throws SQLException {
          if (JdbcUtils.isMysqlDbType(holder.dataSource.getDbType())) {
              if (holder.initSchema == null) {
                  holder.initSchema = conn.getSchema();
              }
              conn.setSchema(schema);
              if (holder.statementPool != null) {
                  holder.clearStatementCache();
              }
              return;
          }
          conn.setSchema(schema);
      }
  
      public String getSchema() throws SQLException {
          return conn.getSchema();
      }
  
      public void abort(Executor executor) throws SQLException {
          conn.abort(executor);
      }
  
      public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
          conn.setNetworkTimeout(executor, milliseconds);
      }
  
      public int getNetworkTimeout() throws SQLException {
          return conn.getNetworkTimeout();
      }
  
      final void beforeExecute() {
          final DruidConnectionHolder holder = this.holder;
          if (holder != null && holder.dataSource.removeAbandoned) {
              running = true;
          }
      }
  
      final void afterExecute() {
          final DruidConnectionHolder holder = this.holder;
          if (holder != null) {
              DruidAbstractDataSource dataSource = holder.dataSource;
              if (dataSource.removeAbandoned) {
                  running = false;
                  holder.lastActiveTimeMillis = System.currentTimeMillis();
              }
              dataSource.onFatalError = false;
          }
      }
  
      boolean isRunning() {
          return running;
      }
  
      public void abandond() {
          this.abandoned = true;
      }
  
      /**
       * @since 1.0.17
       */
      public long getPhysicalConnectNanoSpan() {
          return this.holder.getCreateNanoSpan();
      }
  
      /**
       * @since 1.0.17
       */
      public long getPhysicalConnectionUsedCount() {
          return this.holder.getUseCount();
      }
  
      /**
       * @since 1.0.17
       */
      public long getConnectNotEmptyWaitNanos() {
          return this.holder.getLastNotEmptyWaitNanos();
      }
  
      /**
       * @since 1.0.28
       */
      public Map<String, Object> getVariables() {
          return this.holder.variables;
      }
  
      /**
       * @since 1.0.28
       */
      public Map<String, Object> getGloablVariables() {
          return this.holder.globalVariables;
      }
  }
  