/*
* 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.service;
import org.apache.cassandra.db.SinglePartitionReadCommand;
import org.apache.cassandra.db.partitions.FilteredPartition;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.exceptions.InvalidRequestException;
/**
* Abstract the conditions and updates for a CAS operation.
*/
public interface CASRequest
{
/**
* The command to use to fetch the value to compare for the CAS.
*/
public SinglePartitionReadCommand readCommand(int nowInSec);
/**
* Returns whether the provided CF, that represents the values fetched using the
* readFilter(), match the CAS conditions this object stands for.
*/
public boolean appliesTo(FilteredPartition current) throws InvalidRequestException;
/**
* The updates to perform of a CAS success. The values fetched using the readFilter()
* are passed as argument.
*/
public PartitionUpdate makeUpdates(FilteredPartition current) throws InvalidRequestException;
}