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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
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* distributed with this work for additional information
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* 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
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.cassandra.db;
import java.nio.ByteBuffer;
import java.util.*;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.schema.TableId;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.schema.Schema;
import org.apache.cassandra.cql3.ColumnIdentifier;
import org.apache.cassandra.db.context.CounterContext;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.db.rows.BTreeRow;
import org.apache.cassandra.db.rows.BufferCell;
import org.apache.cassandra.db.rows.Cell;
import org.apache.cassandra.db.rows.CellPath;
import org.apache.cassandra.db.rows.Row;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.CounterId;
import org.apache.cassandra.utils.FBUtilities;
import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUIDAsBytes;
public abstract class SimpleBuilders
{
private SimpleBuilders()
{
}
private static DecoratedKey makePartitonKey(TableMetadata metadata, Object... partitionKey)
{
if (partitionKey.length == 1 && partitionKey[0] instanceof DecoratedKey)
return (DecoratedKey)partitionKey[0];
ByteBuffer key = metadata.partitionKeyAsClusteringComparator().make(partitionKey).serializeAsPartitionKey();
return metadata.partitioner.decorateKey(key);
}
private static Clustering makeClustering(TableMetadata metadata, Object... clusteringColumns)
{
if (clusteringColumns.length == 1 && clusteringColumns[0] instanceof Clustering)
return (Clustering)clusteringColumns[0];
if (clusteringColumns.length == 0)
{
// If the table has clustering columns, passing no values is for updating the static values, so check we
// do have some static columns defined.
assert metadata.comparator.size() == 0 || !metadata.staticColumns().isEmpty();
return metadata.comparator.size() == 0 ? Clustering.EMPTY : Clustering.STATIC_CLUSTERING;
}
else
{
return metadata.comparator.make(clusteringColumns);
}
}
private static class AbstractBuilder
{
protected long timestamp = FBUtilities.timestampMicros();
protected int ttl = 0;
protected long nowInSec = FBUtilities.nowInSeconds();
protected void copyParams(AbstractBuilder other)
{
other.timestamp = timestamp;
other.ttl = ttl;
other.nowInSec = nowInSec;
}
public T timestamp(long timestamp)
{
this.timestamp = timestamp;
return (T)this;
}
public T ttl(int ttl)
{
this.ttl = ttl;
return (T)this;
}
public T nowInSec(long nowInSec)
{
this.nowInSec = nowInSec;
return (T)this;
}
}
public static class MutationBuilder extends AbstractBuilder implements Mutation.SimpleBuilder
{
private final String keyspaceName;
private final DecoratedKey key;
private final Map updateBuilders = new HashMap<>();
public MutationBuilder(String keyspaceName, DecoratedKey key)
{
this.keyspaceName = keyspaceName;
this.key = key;
}
public PartitionUpdate.SimpleBuilder update(TableMetadata metadata)
{
assert metadata.keyspace.equals(keyspaceName);
PartitionUpdateBuilder builder = updateBuilders.get(metadata.id);
if (builder == null)
{
builder = new PartitionUpdateBuilder(metadata, key);
updateBuilders.put(metadata.id, builder);
}
copyParams(builder);
return builder;
}
public PartitionUpdate.SimpleBuilder update(String tableName)
{
TableMetadata metadata = Schema.instance.getTableMetadata(keyspaceName, tableName);
assert metadata != null : "Unknown table " + tableName + " in keyspace " + keyspaceName;
return update(metadata);
}
public Mutation build()
{
assert !updateBuilders.isEmpty() : "Cannot create empty mutation";
if (updateBuilders.size() == 1)
return new Mutation(updateBuilders.values().iterator().next().build());
Mutation.PartitionUpdateCollector mutationBuilder = new Mutation.PartitionUpdateCollector(keyspaceName, key);
for (PartitionUpdateBuilder builder : updateBuilders.values())
mutationBuilder.add(builder.build());
return mutationBuilder.build();
}
}
public static class PartitionUpdateBuilder extends AbstractBuilder implements PartitionUpdate.SimpleBuilder
{
private final TableMetadata metadata;
private final DecoratedKey key;
private final Map, RowBuilder> rowBuilders = new HashMap<>();
private List rangeBuilders = null; // We use that rarely, so create lazily
private List rangeTombstones = null;
private DeletionTime partitionDeletion = DeletionTime.LIVE;
public PartitionUpdateBuilder(TableMetadata metadata, Object... partitionKeyValues)
{
this.metadata = metadata;
this.key = makePartitonKey(metadata, partitionKeyValues);
}
public TableMetadata metadata()
{
return metadata;
}
public Row.SimpleBuilder row(Object... clusteringValues)
{
Clustering clustering = makeClustering(metadata, clusteringValues);
RowBuilder builder = rowBuilders.get(clustering);
if (builder == null)
{
builder = new RowBuilder(metadata, clustering);
rowBuilders.put(clustering, builder);
}
copyParams(builder);
return builder;
}
public PartitionUpdate.SimpleBuilder delete()
{
this.partitionDeletion = DeletionTime.build(timestamp, nowInSec);
return this;
}
public RangeTombstoneBuilder addRangeTombstone()
{
if (rangeBuilders == null)
rangeBuilders = new ArrayList<>();
RTBuilder builder = new RTBuilder(metadata.comparator, DeletionTime.build(timestamp, nowInSec));
rangeBuilders.add(builder);
return builder;
}
public PartitionUpdate.SimpleBuilder addRangeTombstone(RangeTombstone rt)
{
if (rangeTombstones == null)
rangeTombstones = new ArrayList<>();
rangeTombstones.add(rt);
return this;
}
public PartitionUpdate build()
{
// Collect all updated columns
RegularAndStaticColumns.Builder columns = RegularAndStaticColumns.builder();
for (RowBuilder builder : rowBuilders.values())
columns.addAll(builder.columns());
// Note that rowBuilders.size() could include the static column so could be 1 off the really need capacity
// of the final PartitionUpdate, but as that's just a sizing hint, we'll live.
PartitionUpdate.Builder update = new PartitionUpdate.Builder(metadata, key, columns.build(), rowBuilders.size());
update.addPartitionDeletion(partitionDeletion);
if (rangeBuilders != null)
{
for (RTBuilder builder : rangeBuilders)
update.add(builder.build());
}
if (rangeTombstones != null)
{
for (RangeTombstone rt : rangeTombstones)
update.add(rt);
}
for (RowBuilder builder : rowBuilders.values())
update.add(builder.build());
return update.build();
}
public Mutation buildAsMutation()
{
return new Mutation(build());
}
private static class RTBuilder implements RangeTombstoneBuilder
{
private final ClusteringComparator comparator;
private final DeletionTime deletionTime;
private Object[] start;
private Object[] end;
private boolean startInclusive = true;
private boolean endInclusive = true;
private RTBuilder(ClusteringComparator comparator, DeletionTime deletionTime)
{
this.comparator = comparator;
this.deletionTime = deletionTime;
}
public RangeTombstoneBuilder start(Object... values)
{
this.start = values;
return this;
}
public RangeTombstoneBuilder end(Object... values)
{
this.end = values;
return this;
}
public RangeTombstoneBuilder inclStart()
{
this.startInclusive = true;
return this;
}
public RangeTombstoneBuilder exclStart()
{
this.startInclusive = false;
return this;
}
public RangeTombstoneBuilder inclEnd()
{
this.endInclusive = true;
return this;
}
public RangeTombstoneBuilder exclEnd()
{
this.endInclusive = false;
return this;
}
private RangeTombstone build()
{
ClusteringBound startBound = ClusteringBound.create(comparator, true, startInclusive, start);
ClusteringBound endBound = ClusteringBound.create(comparator, false, endInclusive, end);
return new RangeTombstone(Slice.make(startBound, endBound), deletionTime);
}
}
}
public static class RowBuilder extends AbstractBuilder implements Row.SimpleBuilder
{
private final TableMetadata metadata;
private final Set columns = new HashSet<>();
private final Row.Builder builder;
private boolean initiated;
private boolean noPrimaryKeyLivenessInfo;
public RowBuilder(TableMetadata metadata, Object... clusteringColumns)
{
this.metadata = metadata;
this.builder = BTreeRow.unsortedBuilder();
this.builder.newRow(makeClustering(metadata, clusteringColumns));
}
Set columns()
{
return columns;
}
private void maybeInit()
{
// We're working around the fact that Row.Builder requires that addPrimaryKeyLivenessInfo() and
// addRowDeletion() are called before any cell addition (which is done so the builder can more easily skip
// shadowed cells).
if (initiated)
return;
// Adds the row liveness
if (!metadata.isCompactTable() && !noPrimaryKeyLivenessInfo)
builder.addPrimaryKeyLivenessInfo(LivenessInfo.create(timestamp, ttl, nowInSec));
initiated = true;
}
public Row.SimpleBuilder add(String columnName, Object value)
{
return add(columnName, value, true);
}
public Row.SimpleBuilder appendAll(String columnName, Object value)
{
return add(columnName, value, false);
}
private Row.SimpleBuilder add(String columnName, Object value, boolean overwriteForCollection)
{
maybeInit();
ColumnMetadata column = getColumn(columnName);
if (!overwriteForCollection && !(column.type.isMultiCell() && column.type.isCollection()))
throw new IllegalArgumentException("appendAll() can only be called on non-frozen collections");
columns.add(column);
if (!column.type.isMultiCell())
{
builder.addCell(cell(column, toByteBuffer(value, column.type), null));
return this;
}
assert column.type instanceof CollectionType : "Collection are the only multi-cell types supported so far";
if (value == null)
{
builder.addComplexDeletion(column, DeletionTime.build(timestamp, nowInSec));
return this;
}
// Erase previous entry if any.
if (overwriteForCollection)
builder.addComplexDeletion(column, DeletionTime.build(timestamp - 1, nowInSec));
switch (((CollectionType)column.type).kind)
{
case LIST:
ListType lt = (ListType)column.type;
assert value instanceof List;
for (Object elt : (List)value)
builder.addCell(cell(column, toByteBuffer(elt, lt.getElementsType()), CellPath.create(ByteBuffer.wrap(nextTimeUUIDAsBytes()))));
break;
case SET:
SetType st = (SetType)column.type;
assert value instanceof Set;
for (Object elt : (Set)value)
builder.addCell(cell(column, ByteBufferUtil.EMPTY_BYTE_BUFFER, CellPath.create(toByteBuffer(elt, st.getElementsType()))));
break;
case MAP:
MapType mt = (MapType)column.type;
assert value instanceof Map;
for (Map.Entry entry : ((Map)value).entrySet())
builder.addCell(cell(column,
toByteBuffer(entry.getValue(), mt.getValuesType()),
CellPath.create(toByteBuffer(entry.getKey(), mt.getKeysType()))));
break;
default:
throw new AssertionError();
}
return this;
}
public Row.SimpleBuilder delete()
{
assert !initiated : "If called, delete() should be called before any other column value addition";
builder.addRowDeletion(Row.Deletion.regular(DeletionTime.build(timestamp, nowInSec)));
return this;
}
public Row.SimpleBuilder deletePrevious()
{
builder.addRowDeletion(Row.Deletion.regular(DeletionTime.build(timestamp - 1, nowInSec)));
return this;
}
public Row.SimpleBuilder delete(String columnName)
{
return add(columnName, null);
}
public Row.SimpleBuilder noPrimaryKeyLivenessInfo()
{
this.noPrimaryKeyLivenessInfo = true;
return this;
}
public Row build()
{
maybeInit();
return builder.build();
}
private ColumnMetadata getColumn(String columnName)
{
ColumnMetadata column = metadata.getColumn(new ColumnIdentifier(columnName, true));
assert column != null : "Cannot find column " + columnName;
assert !column.isPrimaryKeyColumn();
assert !column.isStatic() || builder.clustering() == Clustering.STATIC_CLUSTERING : "Cannot add non-static column to static-row";
return column;
}
private Cell cell(ColumnMetadata column, ByteBuffer value, CellPath path)
{
if (value == null)
return BufferCell.tombstone(column, timestamp, nowInSec, path);
return ttl == LivenessInfo.NO_TTL
? BufferCell.live(column, timestamp, value, path)
: BufferCell.expiring(column, timestamp, ttl, nowInSec, value, path);
}
private ByteBuffer toByteBuffer(Object value, AbstractType type)
{
if (value == null)
return null;
if (value instanceof ByteBuffer)
return (ByteBuffer)value;
if (type.isCounter())
{
// See UpdateParameters.addCounter()
assert value instanceof Long : "Attempted to adjust Counter cell with non-long value.";
return CounterContext.instance().createGlobal(CounterId.getLocalId(), 1, (Long)value);
}
return ((AbstractType)type).decompose(value);
}
}
}
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