View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.shardingsphere.proxy.frontend.postgresql.command.query.extended.close;
19  
20  import lombok.RequiredArgsConstructor;
21  import org.apache.shardingsphere.db.protocol.packet.DatabasePacket;
22  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.close.PostgreSQLCloseCompletePacket;
23  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.close.PostgreSQLComClosePacket;
24  import org.apache.shardingsphere.infra.exception.generic.UnsupportedSQLOperationException;
25  import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
26  import org.apache.shardingsphere.proxy.frontend.command.executor.CommandExecutor;
27  import org.apache.shardingsphere.proxy.frontend.postgresql.command.PortalContext;
28  
29  import java.sql.SQLException;
30  import java.util.Collection;
31  import java.util.Collections;
32  
33  /**
34   * Command close executor for PostgreSQL.
35   */
36  @RequiredArgsConstructor
37  public final class PostgreSQLComCloseExecutor implements CommandExecutor {
38      
39      private final PortalContext portalContext;
40      
41      private final PostgreSQLComClosePacket packet;
42      
43      private final ConnectionSession connectionSession;
44      
45      @Override
46      public Collection<DatabasePacket> execute() throws SQLException {
47          switch (packet.getType()) {
48              case PREPARED_STATEMENT:
49                  connectionSession.getServerPreparedStatementRegistry().removePreparedStatement(packet.getName());
50                  break;
51              case PORTAL:
52                  portalContext.close(packet.getName());
53                  break;
54              default:
55                  throw new UnsupportedSQLOperationException(packet.getType().name());
56          }
57          return Collections.singleton(new PostgreSQLCloseCompletePacket());
58      }
59  }