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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.db;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.schema.TableId;
public interface IMutation
{
public long MAX_MUTATION_SIZE = DatabaseDescriptor.getMaxMutationSize();
public void apply();
public String getKeyspaceName();
public Collection getTableIds();
public DecoratedKey key();
public long getTimeout(TimeUnit unit);
public String toString(boolean shallow);
public Collection getPartitionUpdates();
public Supplier hintOnFailure();
public default void validateIndexedColumns()
{
for (PartitionUpdate pu : getPartitionUpdates())
pu.validateIndexedColumns();
}
/**
* Validates size of mutation does not exceed {@link DatabaseDescriptor#getMaxMutationSize()}.
*
* @param version the MessagingService version the mutation is being serialized for.
* see {@link org.apache.cassandra.net.MessagingService#current_version}
* @param overhead overhadd to add for mutation size to validate. Pass zero if not required but not a negative value.
* @throws MutationExceededMaxSizeException if {@link DatabaseDescriptor#getMaxMutationSize()} is exceeded
*/
public void validateSize(int version, int overhead);
/**
* Computes the total data size of the specified mutations.
* @param mutations the mutations
* @return the total data size of the specified mutations
*/
public static long dataSize(Collection mutations)
{
long size = 0;
for (IMutation mutation : mutations)
{
for (PartitionUpdate update : mutation.getPartitionUpdates())
size += update.dataSize();
}
return size;
}
}