/*
* 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.io.sstable;
import java.io.Closeable;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.context.CounterContext;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.io.sstable.metadata.MetadataCollector;
import org.apache.cassandra.service.ActiveRepairService;
import org.apache.cassandra.utils.CounterId;
import org.apache.cassandra.utils.Pair;
public abstract class AbstractSSTableSimpleWriter implements Closeable
{
protected final File directory;
protected final CFMetaData metadata;
protected DecoratedKey currentKey;
protected ColumnFamily columnFamily;
protected ByteBuffer currentSuperColumn;
protected final CounterId counterid = CounterId.generate();
protected static AtomicInteger generation = new AtomicInteger(0);
public AbstractSSTableSimpleWriter(File directory, CFMetaData metadata, IPartitioner partitioner)
{
this.metadata = metadata;
this.directory = directory;
DatabaseDescriptor.setPartitioner(partitioner);
}
protected SSTableWriter getWriter()
{
return new SSTableWriter(
makeFilename(directory, metadata.ksName, metadata.cfName),
0, // We don't care about the bloom filter
ActiveRepairService.UNREPAIRED_SSTABLE,
metadata,
DatabaseDescriptor.getPartitioner(),
new MetadataCollector(metadata.comparator));
}
// find available generation and pick up filename from that
protected static String makeFilename(File directory, final String keyspace, final String columnFamily)
{
final Set<Descriptor> existing = new HashSet<Descriptor>();
directory.list(new FilenameFilter()
{
public boolean accept(File dir, String name)
{
Pair<Descriptor, Component> p = SSTable.tryComponentFromFilename(dir, name);
Descriptor desc = p == null ? null : p.left;
if (desc == null)
return false;
if (desc.cfname.equals(columnFamily))
existing.add(desc);
return false;
}
});
int maxGen = generation.getAndIncrement();
for (Descriptor desc : existing)
{
while (desc.generation > maxGen)
{
maxGen = generation.getAndIncrement();
}
}
return new Descriptor(directory, keyspace, columnFamily, maxGen + 1, Descriptor.Type.TEMP).filenameFor(Component.DATA);
}
/**
* Start a new row whose key is {@code key}.
* @param key the row key
*/
public void newRow(ByteBuffer key) throws IOException
{
if (currentKey != null && !columnFamily.isEmpty())
writeRow(currentKey, columnFamily);
currentKey = DatabaseDescriptor.getPartitioner().decorateKey(key);
columnFamily = getColumnFamily();
}
/**
* Start a new super column with name {@code name}.
* @param name the name for the super column
*/
public void newSuperColumn(ByteBuffer name)
{
if (!columnFamily.metadata().isSuper())
throw new IllegalStateException("Cannot add a super column to a standard column family");
currentSuperColumn = name;
}
protected void addColumn(Cell cell) throws IOException
{
if (columnFamily.metadata().isSuper())
{
if (currentSuperColumn == null)
throw new IllegalStateException("Trying to add a cell to a super column family, but no super cell has been started.");
cell = cell.withUpdatedName(columnFamily.getComparator().makeCellName(currentSuperColumn, cell.name().toByteBuffer()));
}
columnFamily.addColumn(cell);
}
/**
* Insert a new "regular" column to the current row (and super column if applicable).
* @param name the column name
* @param value the column value
* @param timestamp the column timestamp
*/
public void addColumn(ByteBuffer name, ByteBuffer value, long timestamp) throws IOException
{
addColumn(new BufferCell(metadata.comparator.cellFromByteBuffer(name), value, timestamp));
}
/**
* Insert a new expiring column to the current row (and super column if applicable).
* @param name the column name
* @param value the column value
* @param timestamp the column timestamp
* @param ttl the column time to live in seconds
* @param expirationTimestampMS the local expiration timestamp in milliseconds. This is the server time timestamp used for actually
* expiring the column, and as a consequence should be synchronized with the cassandra servers time. If {@code timestamp} represents
* the insertion time in microseconds (which is not required), this should be {@code (timestamp / 1000) + (ttl * 1000)}.
*/
public void addExpiringColumn(ByteBuffer name, ByteBuffer value, long timestamp, int ttl, long expirationTimestampMS) throws IOException
{
addColumn(new BufferExpiringCell(metadata.comparator.cellFromByteBuffer(name), value, timestamp, ttl, (int)(expirationTimestampMS / 1000)));
}
/**
* Insert a new counter column to the current row (and super column if applicable).
* @param name the column name
* @param value the value of the counter
*/
public void addCounterColumn(ByteBuffer name, long value) throws IOException
{
addColumn(new BufferCounterCell(metadata.comparator.cellFromByteBuffer(name),
CounterContext.instance().createGlobal(counterid, 1L, value),
System.currentTimeMillis()));
}
/**
* Package protected for use by AbstractCQLSSTableWriter.
* Not meant to be exposed publicly.
*/
ColumnFamily currentColumnFamily()
{
return columnFamily;
}
/**
* Package protected for use by AbstractCQLSSTableWriter.
* Not meant to be exposed publicly.
*/
DecoratedKey currentKey()
{
return currentKey;
}
/**
* Package protected for use by AbstractCQLSSTableWriter.
* Not meant to be exposed publicly.
*/
boolean shouldStartNewRow() throws IOException
{
return currentKey == null;
}
protected abstract void writeRow(DecoratedKey key, ColumnFamily columnFamily) throws IOException;
protected abstract ColumnFamily getColumnFamily() throws IOException;
}