content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.sqlengine;
  
  import com.actiontech.dble.DbleServer;
  import com.actiontech.dble.backend.datasource.PhysicalDbInstance;
  import com.actiontech.dble.backend.datasource.ShardingNode;
  import com.actiontech.dble.backend.mysql.nio.handler.ResponseHandler;
  import com.actiontech.dble.meta.ReloadLogHelper;
  import com.actiontech.dble.net.connection.BackendConnection;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.net.service.AbstractService;
  import com.actiontech.dble.route.RouteResultsetNode;
  import com.actiontech.dble.server.parser.ServerParse;
  import com.actiontech.dble.services.mysqlsharding.MySQLResponseService;
  import org.jetbrains.annotations.NotNull;
  
  import java.util.List;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  /**
   * async execute in EngineCtx or standalone (EngineCtx=null)
   *
   * @author yhq
   */
  public class MultiTablesMetaJob implements ResponseHandler, Runnable {
  
      public final ReloadLogHelper logger;
  
      private final String sql;
      private final String shardingNode;
      private final String schema;
      private BackendConnection connection;
      private final SQLJobHandler jobHandler;
      private final PhysicalDbInstance ds;
      private boolean isMustWriteNode;
      private AtomicBoolean finished = new AtomicBoolean(false);
  
      public MultiTablesMetaJob(String sql, String schema, SQLJobHandler jobHandler, PhysicalDbInstance ds, boolean isReload) {
          super();
          this.logger = new ReloadLogHelper(isReload);
          this.sql = sql;
          this.jobHandler = jobHandler;
          this.ds = ds;
          this.schema = schema;
          this.shardingNode = null;
      }
  
      public MultiTablesMetaJob(String sql, String shardingNode, SQLJobHandler jobHandler, boolean isMustWriteNode, boolean isReload) {
          super();
          this.sql = sql;
          this.jobHandler = jobHandler;
          this.ds = null;
          this.shardingNode = shardingNode;
          this.schema = null;
          this.isMustWriteNode = isMustWriteNode;
          this.logger = new ReloadLogHelper(isReload);
      }
  
      public void run() {
          try {
              if (ds == null) {
                  RouteResultsetNode node = new RouteResultsetNode(shardingNode, ServerParse.SELECT, sql);
                  // create new connection
                  ShardingNode dn = DbleServer.getInstance().getConfig().getShardingNodes().get(node.getName());
                  dn.getConnection(dn.getDatabase(), isMustWriteNode, true, node, this, node);
              } else {
                  ds.getConnection(schema, this, null, false);
              }
          } catch (Exception e) {
              logger.warn("can't get connection" + shardingNode, e);
              doFinished(true);
          }
      }
  
      public void terminate(String reason) {
          logger.info("terminate this job reason:" + reason + " con:" + connection + " sql " + this.sql);
          if (connection != null) {
              connection.close(reason);
          }
      }
  
      @Override
      public void connectionAcquired(final BackendConnection conn) {
          conn.getBackendService().setResponseHandler(this);
          conn.getBackendService().setComplexQuery(true);
          logger.info("connectionAcquired on connection " + conn.getBackendService());
          try {
              conn.getBackendService().query(sql, true);
              connection = conn;
          } catch (Exception e) { // (UnsupportedEncodingException e) {
              doFinished(true);
          }
  
      }
  
      public boolean isFinished() {
          return finished.get();
      }
  
      private void doFinished(boolean failed) {
          logger.info("Finish MultiTablesMetaJob with result " + failed + " on connection " + connection);
          if (finished.compareAndSet(false, true)) {
              jobHandler.finished(shardingNode == null ? schema : shardingNode, failed);
          }
      }
  
      @Override
      public void connectionError(Throwable e, Object attachment) {
          logger.warn("can't get connection for sql :" + sql, e);
          doFinished(true);
      }
  
      @Override
      public void errorResponse(byte[] err, @NotNull AbstractService service) {
          ErrorPacket errPg = new ErrorPacket();
          errPg.read(err);
  
          String errMsg = "error response errNo:" + errPg.getErrNo() + ", " + new String(errPg.getMessage()) +
                  " from of sql :" + sql + " at con:" + service;
  
          logger.info(errMsg);
          if (((MySQLResponseService) service).syncAndExecute()) {
              ((MySQLResponseService) service).release();
          } else {
              ((MySQLResponseService) service).getConnection().businessClose("unfinished sync");
          }
          doFinished(true);
      }
  
      @Override
      public void okResponse(byte[] ok, @NotNull AbstractService service) {
          if (((MySQLResponseService) service).syncAndExecute()) {
              ((MySQLResponseService) service).release();
              doFinished(false);
          }
      }
  
      @Override
      public void fieldEofResponse(byte[] header, List<byte[]> fields, List<FieldPacket> fieldPackets, byte[] eof,
                                   boolean isLeft, @NotNull AbstractService service) {
          jobHandler.onHeader(fields);
      }
  
      @Override
      public boolean rowResponse(byte[] row, RowDataPacket rowPacket, boolean isLeft, @NotNull AbstractService service) {
          jobHandler.onRowData(row);
          return false;
      }
  
      @Override
      public void rowEofResponse(byte[] eof, boolean isLeft, @NotNull AbstractService service) {
          EOFPacket packet = new EOFPacket();
          packet.read(eof);
          if ((packet.getStatus() & StatusFlags.SERVER_MORE_RESULTS_EXISTS) <= 0) {
              ((MySQLResponseService) service).getConnection().release();
              doFinished(false);
          }
      }
  
      @Override
      public void connectionClose(@NotNull AbstractService service, String reason) {
          doFinished(true);
      }
  
      @Override
      public String toString() {
          return "SQLJob [shardingNode=" +
                  shardingNode + ",schema=" +
                  schema + ",sql=" + sql + ",  jobHandler=" +
                  jobHandler + "]";
      }
  
  }
  