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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.

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/*
 * 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 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 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 {@link 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;
    }
}