| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.cassandra.cql3.statements; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.Schema; |
| import org.apache.cassandra.cql3.CFName; |
| import org.apache.cassandra.exceptions.ConfigurationException; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.exceptions.RequestValidationException; |
| import org.apache.cassandra.exceptions.UnauthorizedException; |
| import org.apache.cassandra.schema.TriggerMetadata; |
| import org.apache.cassandra.schema.Triggers; |
| import org.apache.cassandra.service.ClientState; |
| import org.apache.cassandra.service.MigrationManager; |
| import org.apache.cassandra.service.QueryState; |
| import org.apache.cassandra.thrift.ThriftValidation; |
| import org.apache.cassandra.transport.Event; |
| import org.apache.cassandra.triggers.TriggerExecutor; |
| |
| public class CreateTriggerStatement extends SchemaAlteringStatement |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CreateTriggerStatement.class); |
| |
| private final String triggerName; |
| private final String triggerClass; |
| private final boolean ifNotExists; |
| |
| public CreateTriggerStatement(CFName name, String triggerName, String clazz, boolean ifNotExists) |
| { |
| super(name); |
| this.triggerName = triggerName; |
| this.triggerClass = clazz; |
| this.ifNotExists = ifNotExists; |
| } |
| |
| public void checkAccess(ClientState state) throws UnauthorizedException |
| { |
| state.ensureIsSuper("Only superusers are allowed to perform CREATE TRIGGER queries"); |
| } |
| |
| public void validate(ClientState state) throws RequestValidationException |
| { |
| CFMetaData cfm = ThriftValidation.validateColumnFamily(keyspace(), columnFamily()); |
| if (cfm.isView()) |
| throw new InvalidRequestException("Cannot CREATE TRIGGER against a materialized view"); |
| |
| try |
| { |
| TriggerExecutor.instance.loadTriggerInstance(triggerClass); |
| } |
| catch (Exception e) |
| { |
| throw new ConfigurationException(String.format("Trigger class '%s' doesn't exist", triggerClass)); |
| } |
| } |
| |
| public Event.SchemaChange announceMigration(QueryState queryState, boolean isLocalOnly) throws ConfigurationException, InvalidRequestException |
| { |
| CFMetaData cfm = Schema.instance.getCFMetaData(keyspace(), columnFamily()).copy(); |
| Triggers triggers = cfm.getTriggers(); |
| |
| if (triggers.get(triggerName).isPresent()) |
| { |
| if (ifNotExists) |
| return null; |
| else |
| throw new InvalidRequestException(String.format("Trigger %s already exists", triggerName)); |
| } |
| |
| cfm.triggers(triggers.with(TriggerMetadata.create(triggerName, triggerClass))); |
| logger.info("Adding trigger with name {} and class {}", triggerName, triggerClass); |
| MigrationManager.announceColumnFamilyUpdate(cfm, isLocalOnly); |
| return new Event.SchemaChange(Event.SchemaChange.Change.UPDATED, Event.SchemaChange.Target.TABLE, keyspace(), columnFamily()); |
| } |
| } |