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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.compaction;

import java.util.Iterator;
import java.util.Set;

import com.google.common.base.Preconditions;

import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.compaction.writers.CompactionAwareWriter;
import org.apache.cassandra.io.FSDiskFullWriteError;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.utils.TimeUUID;
import org.apache.cassandra.utils.WrappedRunnable;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;

public abstract class AbstractCompactionTask extends WrappedRunnable
{
    protected final ColumnFamilyStore cfs;
    protected LifecycleTransaction transaction;
    protected boolean isUserDefined;
    protected OperationType compactionType;

    /**
     * @param cfs
     * @param transaction the modifying managing the status of the sstables we're replacing
     */
    public AbstractCompactionTask(ColumnFamilyStore cfs, LifecycleTransaction transaction)
    {
        this.cfs = cfs;
        this.transaction = transaction;
        this.isUserDefined = false;
        this.compactionType = OperationType.COMPACTION;
        // enforce contract that caller should mark sstables compacting
        Set compacting = transaction.tracker.getCompacting();
        for (SSTableReader sstable : transaction.originals())
            assert compacting.contains(sstable) : sstable.getFilename() + " is not correctly marked compacting";

        validateSSTables(transaction.originals());
    }

    /**
     * Confirm that we're not attempting to compact repaired/unrepaired/pending repair sstables together
     */
    private void validateSSTables(Set sstables)
    {
        // do not allow  to be compacted together
        if (!sstables.isEmpty())
        {
            Iterator iter = sstables.iterator();
            SSTableReader first = iter.next();
            boolean isRepaired = first.isRepaired();
            TimeUUID pendingRepair = first.getPendingRepair();
            while (iter.hasNext())
            {
                SSTableReader next = iter.next();
                Preconditions.checkArgument(isRepaired == next.isRepaired(),
                                            "Cannot compact repaired and unrepaired sstables");

                if (pendingRepair == null)
                {
                    Preconditions.checkArgument(!next.isPendingRepair(),
                                                "Cannot compact pending repair and non-pending repair sstables");
                }
                else
                {
                    Preconditions.checkArgument(next.isPendingRepair(),
                                                "Cannot compact pending repair and non-pending repair sstables");
                    Preconditions.checkArgument(pendingRepair.equals(next.getPendingRepair()),
                                                "Cannot compact sstables from different pending repairs");
                }
            }
        }
    }

    /**
     * executes the task and unmarks sstables compacting
     */
    public int execute(ActiveCompactionsTracker activeCompactions)
    {
        try
        {
            return executeInternal(activeCompactions);
        }
        catch(FSDiskFullWriteError e)
        {
            RuntimeException cause = new RuntimeException("Converted from FSDiskFullWriteError: " + e.getMessage());
            cause.setStackTrace(e.getStackTrace());
            throw new RuntimeException("Throwing new Runtime to bypass exception handler when disk is full", cause);
        }
        finally
        {
            transaction.close();
        }
    }
    public abstract CompactionAwareWriter getCompactionAwareWriter(ColumnFamilyStore cfs, Directories directories, LifecycleTransaction txn, Set nonExpiredSSTables);

    protected abstract int executeInternal(ActiveCompactionsTracker activeCompactions);

    public AbstractCompactionTask setUserDefined(boolean isUserDefined)
    {
        this.isUserDefined = isUserDefined;
        return this;
    }

    public AbstractCompactionTask setCompactionType(OperationType compactionType)
    {
        this.compactionType = compactionType;
        return this;
    }

    public String toString()
    {
        return "CompactionTask(" + transaction + ")";
    }
}