/*
* 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.ArrayList;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import io.netty.buffer.ByteBuf;
import org.apache.cassandra.db.ConsistencyLevel;
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.utils.Pair;
/**
* Options for a query.
*/
public abstract class QueryOptions
{
public static final QueryOptions DEFAULT = new DefaultQueryOptions(ConsistencyLevel.ONE,
Collections.<ByteBuffer>emptyList(),
false,
SpecificOptions.DEFAULT,
3);
public static final CBCodec<QueryOptions> codec = new Codec();
public static QueryOptions fromProtocolV1(ConsistencyLevel consistency, List<ByteBuffer> values)
{
return new DefaultQueryOptions(consistency, values, false, SpecificOptions.DEFAULT, 1);
}
public static QueryOptions fromProtocolV2(ConsistencyLevel consistency, List<ByteBuffer> values)
{
return new DefaultQueryOptions(consistency, values, false, SpecificOptions.DEFAULT, 2);
}
public static QueryOptions forInternalCalls(ConsistencyLevel consistency, List<ByteBuffer> values)
{
return new DefaultQueryOptions(consistency, values, false, SpecificOptions.DEFAULT, 3);
}
public static QueryOptions fromPreV3Batch(ConsistencyLevel consistency)
{
return new DefaultQueryOptions(consistency, Collections.<ByteBuffer>emptyList(), false, SpecificOptions.DEFAULT, 2);
}
public static QueryOptions create(ConsistencyLevel consistency, List<ByteBuffer> values, boolean skipMetadata, int pageSize, PagingState pagingState, ConsistencyLevel serialConsistency)
{
return new DefaultQueryOptions(consistency, values, skipMetadata, new SpecificOptions(pageSize, pagingState, serialConsistency, -1L), 0);
}
public abstract ConsistencyLevel getConsistency();
public abstract List<ByteBuffer> getValues();
public abstract boolean skipMetadata();
/** The pageSize for this query. Will be <= 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 >= 0 ? 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 int getProtocolVersion();
public abstract QueryOptions withProtocolVersion(int version);
// Mainly for the sake of BatchQueryOptions
abstract SpecificOptions getSpecificOptions();
public QueryOptions prepare(List<ColumnSpecification> specs)
{
return this;
}
static class DefaultQueryOptions extends QueryOptions
{
private final ConsistencyLevel consistency;
private final List<ByteBuffer> values;
private final boolean skipMetadata;
private final SpecificOptions options;
private final transient int protocolVersion;
DefaultQueryOptions(ConsistencyLevel consistency, List<ByteBuffer> values, boolean skipMetadata, SpecificOptions options, int protocolVersion)
{
this.consistency = consistency;
this.values = values;
this.skipMetadata = skipMetadata;
this.options = options;
this.protocolVersion = protocolVersion;
}
public QueryOptions withProtocolVersion(int version)
{
return new DefaultQueryOptions(consistency, values, skipMetadata, options, version);
}
public ConsistencyLevel getConsistency()
{
return consistency;
}
public List<ByteBuffer> getValues()
{
return values;
}
public boolean skipMetadata()
{
return skipMetadata;
}
public int getProtocolVersion()
{
return protocolVersion;
}
SpecificOptions getSpecificOptions()
{
return options;
}
}
static abstract class QueryOptionsWrapper extends QueryOptions
{
protected final QueryOptions wrapped;
QueryOptionsWrapper(QueryOptions wrapped)
{
this.wrapped = wrapped;
}
public ConsistencyLevel getConsistency()
{
return wrapped.getConsistency();
}
public boolean skipMetadata()
{
return wrapped.skipMetadata();
}
public int getProtocolVersion()
{
return wrapped.getProtocolVersion();
}
SpecificOptions getSpecificOptions()
{
return wrapped.getSpecificOptions();
}
@Override
public QueryOptions prepare(List<ColumnSpecification> specs)
{
wrapped.prepare(specs);
return this;
}
public QueryOptions withProtocolVersion(int version)
{
return new DefaultQueryOptions(getConsistency(), getValues(), skipMetadata(), getSpecificOptions(), version);
}
}
static class OptionsWithNames extends QueryOptionsWrapper
{
private final List<String> names;
private List<ByteBuffer> orderedValues;
OptionsWithNames(DefaultQueryOptions wrapped, List<String> names)
{
super(wrapped);
this.names = names;
}
@Override
public QueryOptions prepare(List<ColumnSpecification> specs)
{
super.prepare(specs);
orderedValues = new ArrayList<ByteBuffer>(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;
}
public List<ByteBuffer> 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, -1L);
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<QueryOptions>
{
private static enum Flag
{
// The order of that enum matters!!
VALUES,
SKIP_METADATA,
PAGE_SIZE,
PAGING_STATE,
SERIAL_CONSISTENCY,
TIMESTAMP,
NAMES_FOR_VALUES;
public static EnumSet<Flag> deserialize(int flags)
{
EnumSet<Flag> set = EnumSet.noneOf(Flag.class);
Flag[] values = Flag.values();
for (int n = 0; n < values.length; n++)
{
if ((flags & (1 << n)) != 0)
set.add(values[n]);
}
return set;
}
public static int serialize(EnumSet<Flag> flags)
{
int i = 0;
for (Flag flag : flags)
i |= 1 << flag.ordinal();
return i;
}
}
public QueryOptions decode(ByteBuf body, int version)
{
assert version >= 2;
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
EnumSet<Flag> flags = Flag.deserialize((int)body.readByte());
List<ByteBuffer> values = Collections.<ByteBuffer>emptyList();
List<String> names = null;
if (flags.contains(Flag.VALUES))
{
if (flags.contains(Flag.NAMES_FOR_VALUES))
{
Pair<List<String>, List<ByteBuffer>> namesAndValues = CBUtil.readNameAndValueList(body);
names = namesAndValues.left;
values = namesAndValues.right;
}
else
{
values = CBUtil.readValueList(body);
}
}
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)) : null;
ConsistencyLevel serialConsistency = flags.contains(Flag.SERIAL_CONSISTENCY) ? CBUtil.readConsistencyLevel(body) : ConsistencyLevel.SERIAL;
long timestamp = -1L;
if (flags.contains(Flag.TIMESTAMP))
{
long ts = body.readLong();
if (ts < 0)
throw new ProtocolException("Invalid negative (" + ts + ") protocol level timestamp");
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, int version)
{
assert version >= 2;
CBUtil.writeConsistencyLevel(options.getConsistency(), dest);
EnumSet<Flag> flags = gatherFlags(options);
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(), 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, int version)
{
int size = 0;
size += CBUtil.sizeOfConsistencyLevel(options.getConsistency());
EnumSet<Flag> flags = gatherFlags(options);
size += 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().serialize());
if (flags.contains(Flag.SERIAL_CONSISTENCY))
size += CBUtil.sizeOfConsistencyLevel(options.getSerialConsistency());
if (flags.contains(Flag.TIMESTAMP))
size += 8;
return size;
}
private EnumSet<Flag> gatherFlags(QueryOptions options)
{
EnumSet<Flag> 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 >= 0)
flags.add(Flag.TIMESTAMP);
return flags;
}
}
}