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792f606a64
Contains the cql3 grammer and supporting classes, which will be converted one by one. From commit bf599fb5b062cbcc652da78b7d699e7a01b949ad.
105 lines
3.5 KiB
Java
105 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra.cql3.statements;
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import org.apache.cassandra.cql3.CFName;
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import org.apache.cassandra.cql3.CQLStatement;
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import org.apache.cassandra.cql3.QueryOptions;
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import org.apache.cassandra.exceptions.*;
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import org.apache.cassandra.service.ClientState;
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import org.apache.cassandra.service.QueryState;
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import org.apache.cassandra.transport.Event;
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import org.apache.cassandra.transport.messages.ResultMessage;
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/**
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* Abstract class for statements that alter the schema.
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*/
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public abstract class SchemaAlteringStatement extends CFStatement implements CQLStatement
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{
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private final boolean isColumnFamilyLevel;
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protected SchemaAlteringStatement()
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{
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super(null);
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this.isColumnFamilyLevel = false;
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}
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protected SchemaAlteringStatement(CFName name)
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{
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super(name);
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this.isColumnFamilyLevel = true;
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}
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public int getBoundTerms()
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{
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return 0;
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}
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@Override
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public void prepareKeyspace(ClientState state) throws InvalidRequestException
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{
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if (isColumnFamilyLevel)
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super.prepareKeyspace(state);
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}
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@Override
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public Prepared prepare()
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{
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return new Prepared(this);
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}
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public abstract Event.SchemaChange changeEvent();
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/**
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* Announces the migration to other nodes in the cluster.
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* @return true if the execution of this statement resulted in a schema change, false otherwise (when IF NOT EXISTS
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* is used, for example)
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* @throws RequestValidationException
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*/
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public abstract boolean announceMigration(boolean isLocalOnly) throws RequestValidationException;
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public ResultMessage execute(QueryState state, QueryOptions options) throws RequestValidationException
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{
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// If an IF [NOT] EXISTS clause was used, this may not result in an actual schema change. To avoid doing
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// extra work in the drivers to handle schema changes, we return an empty message in this case. (CASSANDRA-7600)
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boolean didChangeSchema = announceMigration(false);
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if (!didChangeSchema)
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return new ResultMessage.Void();
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Event.SchemaChange ce = changeEvent();
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return ce == null ? new ResultMessage.Void() : new ResultMessage.SchemaChange(ce);
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}
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public ResultMessage executeInternal(QueryState state, QueryOptions options)
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{
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try
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{
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boolean didChangeSchema = announceMigration(true);
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if (!didChangeSchema)
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return new ResultMessage.Void();
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Event.SchemaChange ce = changeEvent();
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return ce == null ? new ResultMessage.Void() : new ResultMessage.SchemaChange(ce);
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}
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catch (RequestValidationException e)
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{
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throw new RuntimeException(e);
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}
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}
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}
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