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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.cql3;
import java.nio.ByteBuffer;
import java.util.*;
import com.google.common.collect.ImmutableList;
import io.netty.buffer.ByteBuf;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.marshal.UTF8Type;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.service.pager.PagingState;
import org.apache.cassandra.transport.CBCodec;
import org.apache.cassandra.transport.CBUtil;
import org.apache.cassandra.transport.ProtocolException;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.Pair;
/**
* Options for a query.
*/
public abstract class QueryOptions
{
public static final QueryOptions DEFAULT = new DefaultQueryOptions(ConsistencyLevel.ONE,
Collections.emptyList(),
false,
SpecificOptions.DEFAULT,
ProtocolVersion.CURRENT);
public static final CBCodec codec = new Codec();
// A cache of bind values parsed as JSON, see getJsonColumnValue for details.
private List> jsonValuesCache;
public static QueryOptions fromThrift(ConsistencyLevel consistency, List values)
{
return new DefaultQueryOptions(consistency, values, false, SpecificOptions.DEFAULT, ProtocolVersion.V3);
}
public static QueryOptions forInternalCalls(ConsistencyLevel consistency, List values)
{
return new DefaultQueryOptions(consistency, values, false, SpecificOptions.DEFAULT, ProtocolVersion.V3);
}
public static QueryOptions forInternalCalls(List values)
{
return new DefaultQueryOptions(ConsistencyLevel.ONE, values, false, SpecificOptions.DEFAULT, ProtocolVersion.V3);
}
public static QueryOptions forProtocolVersion(ProtocolVersion protocolVersion)
{
return new DefaultQueryOptions(null, null, true, null, protocolVersion);
}
public static QueryOptions create(ConsistencyLevel consistency, List values, boolean skipMetadata, int pageSize, PagingState pagingState, ConsistencyLevel serialConsistency, ProtocolVersion version)
{
return new DefaultQueryOptions(consistency, values, skipMetadata, new SpecificOptions(pageSize, pagingState, serialConsistency, Long.MIN_VALUE), version);
}
public static QueryOptions addColumnSpecifications(QueryOptions options, List columnSpecs)
{
return new OptionsWithColumnSpecifications(options, columnSpecs);
}
public abstract ConsistencyLevel getConsistency();
public abstract List getValues();
public abstract boolean skipMetadata();
/**
* Returns the term corresponding to column {@code columnName} in the JSON value of bind index {@code bindIndex}.
*
* This is functionally equivalent to:
* {@code Json.parseJson(UTF8Type.instance.getSerializer().deserialize(getValues().get(bindIndex)), expectedReceivers).get(columnName)}
* but this cache the result of parsing the JSON so that while this might be called for multiple columns on the same {@code bindIndex}
* value, the underlying JSON value is only parsed/processed once.
*
* Note: this is a bit more involved in CQL specifics than this class generally is but we as we need to cache this per-query and in an object
* that is available when we bind values, this is the easier place to have this.
*
* @param bindIndex the index of the bind value that should be interpreted as a JSON value.
* @param columnName the name of the column we want the value of.
* @param expectedReceivers the columns expected in the JSON value at index {@code bindIndex}. This is only used when parsing the
* json initially and no check is done afterwards. So in practice, any call of this method on the same QueryOptions object and with the same
* {@code bindIndx} values should use the same value for this parameter, but this isn't validated in any way.
*
* @return the value correspong to column {@code columnName} in the (JSON) bind value at index {@code bindIndex}. This may return null if the
* JSON value has no value for this column.
*/
public Term getJsonColumnValue(int bindIndex, ColumnIdentifier columnName, Collection expectedReceivers) throws InvalidRequestException
{
if (jsonValuesCache == null)
jsonValuesCache = new ArrayList<>(Collections.>nCopies(getValues().size(), null));
Map jsonValue = jsonValuesCache.get(bindIndex);
if (jsonValue == null)
{
ByteBuffer value = getValues().get(bindIndex);
if (value == null)
throw new InvalidRequestException("Got null for INSERT JSON values");
jsonValue = Json.parseJson(UTF8Type.instance.getSerializer().deserialize(value), expectedReceivers);
jsonValuesCache.set(bindIndex, jsonValue);
}
return jsonValue.get(columnName);
}
/**
* Tells whether or not this QueryOptions contains the column specifications for the bound variables.
* The column specifications will be present only for prepared statements.
* @return true this QueryOptions contains the column specifications for the bound
* variables, false otherwise.
*/
public boolean hasColumnSpecifications()
{
return false;
}
/**
* Returns the column specifications for the bound variables (optional operation).
*
* The column specifications will be present only for prepared statements.
*
* Invoke the {@link hasColumnSpecifications} method before invoking this method in order to ensure that this
* QueryOptions contains the column specifications.
*
* @return the option names
* @throws UnsupportedOperationException If this QueryOptions does not contains the column
* specifications.
*/
public ImmutableList getColumnSpecifications()
{
throw new UnsupportedOperationException();
}
/** The pageSize for this query. Will be {@code <= 0} if not relevant for the query. */
public int getPageSize()
{
return getSpecificOptions().pageSize;
}
/** The paging state for this query, or null if not relevant. */
public PagingState getPagingState()
{
return getSpecificOptions().state;
}
/** Serial consistency for conditional updates. */
public ConsistencyLevel getSerialConsistency()
{
return getSpecificOptions().serialConsistency;
}
public long getTimestamp(QueryState state)
{
long tstamp = getSpecificOptions().timestamp;
return tstamp != Long.MIN_VALUE ? tstamp : state.getTimestamp();
}
/**
* The protocol version for the query. Will be 3 if the object don't come from
* a native protocol request (i.e. it's been allocated locally or by CQL-over-thrift).
*/
public abstract ProtocolVersion getProtocolVersion();
// Mainly for the sake of BatchQueryOptions
abstract SpecificOptions getSpecificOptions();
public QueryOptions prepare(List specs)
{
return this;
}
static class DefaultQueryOptions extends QueryOptions
{
private final ConsistencyLevel consistency;
private final List values;
private final boolean skipMetadata;
private final SpecificOptions options;
private final transient ProtocolVersion protocolVersion;
DefaultQueryOptions(ConsistencyLevel consistency, List values, boolean skipMetadata, SpecificOptions options, ProtocolVersion protocolVersion)
{
this.consistency = consistency;
this.values = values;
this.skipMetadata = skipMetadata;
this.options = options;
this.protocolVersion = protocolVersion;
}
public ConsistencyLevel getConsistency()
{
return consistency;
}
public List getValues()
{
return values;
}
public boolean skipMetadata()
{
return skipMetadata;
}
public ProtocolVersion getProtocolVersion()
{
return protocolVersion;
}
SpecificOptions getSpecificOptions()
{
return options;
}
}
static class QueryOptionsWrapper extends QueryOptions
{
protected final QueryOptions wrapped;
QueryOptionsWrapper(QueryOptions wrapped)
{
this.wrapped = wrapped;
}
public List getValues()
{
return this.wrapped.getValues();
}
public ConsistencyLevel getConsistency()
{
return wrapped.getConsistency();
}
public boolean skipMetadata()
{
return wrapped.skipMetadata();
}
public ProtocolVersion getProtocolVersion()
{
return wrapped.getProtocolVersion();
}
SpecificOptions getSpecificOptions()
{
return wrapped.getSpecificOptions();
}
@Override
public QueryOptions prepare(List specs)
{
wrapped.prepare(specs);
return this;
}
}
/**
* QueryOptions decorator that provides access to the column specifications.
*/
static class OptionsWithColumnSpecifications extends QueryOptionsWrapper
{
private final ImmutableList columnSpecs;
OptionsWithColumnSpecifications(QueryOptions wrapped, List columnSpecs)
{
super(wrapped);
this.columnSpecs = ImmutableList.copyOf(columnSpecs);
}
@Override
public boolean hasColumnSpecifications()
{
return true;
}
@Override
public ImmutableList getColumnSpecifications()
{
return columnSpecs;
}
}
static class OptionsWithNames extends QueryOptionsWrapper
{
private final List names;
private List orderedValues;
OptionsWithNames(DefaultQueryOptions wrapped, List names)
{
super(wrapped);
this.names = names;
}
@Override
public QueryOptions prepare(List specs)
{
super.prepare(specs);
orderedValues = new ArrayList(specs.size());
for (int i = 0; i < specs.size(); i++)
{
String name = specs.get(i).name.toString();
for (int j = 0; j < names.size(); j++)
{
if (name.equals(names.get(j)))
{
orderedValues.add(wrapped.getValues().get(j));
break;
}
}
}
return this;
}
@Override
public List getValues()
{
assert orderedValues != null; // We should have called prepare first!
return orderedValues;
}
}
// Options that are likely to not be present in most queries
static class SpecificOptions
{
private static final SpecificOptions DEFAULT = new SpecificOptions(-1, null, null, Long.MIN_VALUE);
private final int pageSize;
private final PagingState state;
private final ConsistencyLevel serialConsistency;
private final long timestamp;
private SpecificOptions(int pageSize, PagingState state, ConsistencyLevel serialConsistency, long timestamp)
{
this.pageSize = pageSize;
this.state = state;
this.serialConsistency = serialConsistency == null ? ConsistencyLevel.SERIAL : serialConsistency;
this.timestamp = timestamp;
}
}
private static class Codec implements CBCodec
{
private enum Flag
{
// The order of that enum matters!!
VALUES,
SKIP_METADATA,
PAGE_SIZE,
PAGING_STATE,
SERIAL_CONSISTENCY,
TIMESTAMP,
NAMES_FOR_VALUES;
private static final Flag[] ALL_VALUES = values();
public static EnumSet deserialize(int flags)
{
EnumSet set = EnumSet.noneOf(Flag.class);
for (int n = 0; n < ALL_VALUES.length; n++)
{
if ((flags & (1 << n)) != 0)
set.add(ALL_VALUES[n]);
}
return set;
}
public static int serialize(EnumSet flags)
{
int i = 0;
for (Flag flag : flags)
i |= 1 << flag.ordinal();
return i;
}
}
public QueryOptions decode(ByteBuf body, ProtocolVersion version)
{
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
EnumSet flags = Flag.deserialize(version.isGreaterOrEqualTo(ProtocolVersion.V5)
? (int)body.readUnsignedInt()
: (int)body.readUnsignedByte());
List values = Collections.emptyList();
List names = null;
if (flags.contains(Flag.VALUES))
{
if (flags.contains(Flag.NAMES_FOR_VALUES))
{
Pair, List> namesAndValues = CBUtil.readNameAndValueList(body, version);
names = namesAndValues.left;
values = namesAndValues.right;
}
else
{
values = CBUtil.readValueList(body, version);
}
}
boolean skipMetadata = flags.contains(Flag.SKIP_METADATA);
flags.remove(Flag.VALUES);
flags.remove(Flag.SKIP_METADATA);
SpecificOptions options = SpecificOptions.DEFAULT;
if (!flags.isEmpty())
{
int pageSize = flags.contains(Flag.PAGE_SIZE) ? body.readInt() : -1;
PagingState pagingState = flags.contains(Flag.PAGING_STATE) ? PagingState.deserialize(CBUtil.readValue(body), version) : null;
ConsistencyLevel serialConsistency = flags.contains(Flag.SERIAL_CONSISTENCY) ? CBUtil.readConsistencyLevel(body) : ConsistencyLevel.SERIAL;
long timestamp = Long.MIN_VALUE;
if (flags.contains(Flag.TIMESTAMP))
{
long ts = body.readLong();
if (ts == Long.MIN_VALUE)
throw new ProtocolException(String.format("Out of bound timestamp, must be in [%d, %d] (got %d)", Long.MIN_VALUE + 1, Long.MAX_VALUE, ts));
timestamp = ts;
}
options = new SpecificOptions(pageSize, pagingState, serialConsistency, timestamp);
}
DefaultQueryOptions opts = new DefaultQueryOptions(consistency, values, skipMetadata, options, version);
return names == null ? opts : new OptionsWithNames(opts, names);
}
public void encode(QueryOptions options, ByteBuf dest, ProtocolVersion version)
{
CBUtil.writeConsistencyLevel(options.getConsistency(), dest);
EnumSet flags = gatherFlags(options);
if (version.isGreaterOrEqualTo(ProtocolVersion.V5))
dest.writeInt(Flag.serialize(flags));
else
dest.writeByte((byte)Flag.serialize(flags));
if (flags.contains(Flag.VALUES))
CBUtil.writeValueList(options.getValues(), dest);
if (flags.contains(Flag.PAGE_SIZE))
dest.writeInt(options.getPageSize());
if (flags.contains(Flag.PAGING_STATE))
CBUtil.writeValue(options.getPagingState().serialize(version), dest);
if (flags.contains(Flag.SERIAL_CONSISTENCY))
CBUtil.writeConsistencyLevel(options.getSerialConsistency(), dest);
if (flags.contains(Flag.TIMESTAMP))
dest.writeLong(options.getSpecificOptions().timestamp);
// Note that we don't really have to bother with NAMES_FOR_VALUES server side,
// and in fact we never really encode QueryOptions, only decode them, so we
// don't bother.
}
public int encodedSize(QueryOptions options, ProtocolVersion version)
{
int size = 0;
size += CBUtil.sizeOfConsistencyLevel(options.getConsistency());
EnumSet flags = gatherFlags(options);
size += (version.isGreaterOrEqualTo(ProtocolVersion.V5) ? 4 : 1);
if (flags.contains(Flag.VALUES))
size += CBUtil.sizeOfValueList(options.getValues());
if (flags.contains(Flag.PAGE_SIZE))
size += 4;
if (flags.contains(Flag.PAGING_STATE))
size += CBUtil.sizeOfValue(options.getPagingState().serializedSize(version));
if (flags.contains(Flag.SERIAL_CONSISTENCY))
size += CBUtil.sizeOfConsistencyLevel(options.getSerialConsistency());
if (flags.contains(Flag.TIMESTAMP))
size += 8;
return size;
}
private EnumSet gatherFlags(QueryOptions options)
{
EnumSet flags = EnumSet.noneOf(Flag.class);
if (options.getValues().size() > 0)
flags.add(Flag.VALUES);
if (options.skipMetadata())
flags.add(Flag.SKIP_METADATA);
if (options.getPageSize() >= 0)
flags.add(Flag.PAGE_SIZE);
if (options.getPagingState() != null)
flags.add(Flag.PAGING_STATE);
if (options.getSerialConsistency() != ConsistencyLevel.SERIAL)
flags.add(Flag.SERIAL_CONSISTENCY);
if (options.getSpecificOptions().timestamp != Long.MIN_VALUE)
flags.add(Flag.TIMESTAMP);
return flags;
}
}
}