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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3
(CQL3) and Cassandra's binary protocol.
/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed 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 com.datastax.driver.core;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import io.netty.buffer.ByteBuf;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
class Requests {
private Requests() {
}
static class Startup extends Message.Request {
private static final String CQL_VERSION_OPTION = "CQL_VERSION";
private static final String CQL_VERSION = "3.0.0";
static final String COMPRESSION_OPTION = "COMPRESSION";
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Startup msg, ByteBuf dest, ProtocolVersion version) {
CBUtil.writeStringMap(msg.options, dest);
}
@Override
public int encodedSize(Startup msg, ProtocolVersion version) {
return CBUtil.sizeOfStringMap(msg.options);
}
};
private final Map options;
private final ProtocolOptions.Compression compression;
Startup(ProtocolOptions.Compression compression) {
super(Message.Request.Type.STARTUP);
this.compression = compression;
ImmutableMap.Builder map = new ImmutableMap.Builder();
map.put(CQL_VERSION_OPTION, CQL_VERSION);
if (compression != ProtocolOptions.Compression.NONE)
map.put(COMPRESSION_OPTION, compression.toString());
this.options = map.build();
}
@Override
protected Request copyInternal() {
return new Startup(compression);
}
@Override
public String toString() {
return "STARTUP " + options;
}
}
// Only for protocol v1
static class Credentials extends Message.Request {
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Credentials msg, ByteBuf dest, ProtocolVersion version) {
assert version == ProtocolVersion.V1;
CBUtil.writeStringMap(msg.credentials, dest);
}
@Override
public int encodedSize(Credentials msg, ProtocolVersion version) {
assert version == ProtocolVersion.V1;
return CBUtil.sizeOfStringMap(msg.credentials);
}
};
private final Map credentials;
Credentials(Map credentials) {
super(Message.Request.Type.CREDENTIALS);
this.credentials = credentials;
}
@Override
protected Request copyInternal() {
return new Credentials(credentials);
}
}
static class Options extends Message.Request {
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Options msg, ByteBuf dest, ProtocolVersion version) {
}
@Override
public int encodedSize(Options msg, ProtocolVersion version) {
return 0;
}
};
Options() {
super(Message.Request.Type.OPTIONS);
}
@Override
protected Request copyInternal() {
return new Options();
}
@Override
public String toString() {
return "OPTIONS";
}
}
static class Query extends Message.Request {
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Query msg, ByteBuf dest, ProtocolVersion version) {
CBUtil.writeLongString(msg.query, dest);
msg.options.encode(dest, version);
}
@Override
public int encodedSize(Query msg, ProtocolVersion version) {
return CBUtil.sizeOfLongString(msg.query)
+ msg.options.encodedSize(version);
}
};
final String query;
final QueryProtocolOptions options;
Query(String query) {
this(query, QueryProtocolOptions.DEFAULT, false);
}
Query(String query, QueryProtocolOptions options, boolean tracingRequested) {
super(Type.QUERY, tracingRequested);
this.query = query;
this.options = options;
}
@Override
protected Request copyInternal() {
return new Query(this.query, options, isTracingRequested());
}
@Override
protected Request copyInternal(ConsistencyLevel newConsistencyLevel) {
return new Query(this.query, options.copy(newConsistencyLevel), isTracingRequested());
}
@Override
public String toString() {
return "QUERY " + query + '(' + options + ')';
}
}
static class Execute extends Message.Request {
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Execute msg, ByteBuf dest, ProtocolVersion version) {
CBUtil.writeBytes(msg.statementId.bytes, dest);
msg.options.encode(dest, version);
}
@Override
public int encodedSize(Execute msg, ProtocolVersion version) {
return CBUtil.sizeOfBytes(msg.statementId.bytes)
+ msg.options.encodedSize(version);
}
};
final MD5Digest statementId;
final QueryProtocolOptions options;
Execute(MD5Digest statementId, QueryProtocolOptions options, boolean tracingRequested) {
super(Message.Request.Type.EXECUTE, tracingRequested);
this.statementId = statementId;
this.options = options;
}
@Override
protected Request copyInternal() {
return new Execute(statementId, options, isTracingRequested());
}
@Override
protected Request copyInternal(ConsistencyLevel newConsistencyLevel) {
return new Execute(statementId, options.copy(newConsistencyLevel), isTracingRequested());
}
@Override
public String toString() {
return "EXECUTE " + statementId + " (" + options + ')';
}
}
enum QueryFlag {
// The order of that enum matters!!
VALUES,
SKIP_METADATA,
PAGE_SIZE,
PAGING_STATE,
SERIAL_CONSISTENCY,
DEFAULT_TIMESTAMP,
VALUE_NAMES;
static EnumSet deserialize(int flags) {
EnumSet set = EnumSet.noneOf(QueryFlag.class);
QueryFlag[] values = QueryFlag.values();
for (int n = 0; n < values.length; n++) {
if ((flags & (1 << n)) != 0)
set.add(values[n]);
}
return set;
}
static int serialize(EnumSet flags) {
int i = 0;
for (QueryFlag flag : flags)
i |= 1 << flag.ordinal();
return i;
}
}
static class QueryProtocolOptions {
static final QueryProtocolOptions DEFAULT = new QueryProtocolOptions(
Message.Request.Type.QUERY,
ConsistencyLevel.ONE,
Collections.emptyList(),
Collections.emptyMap(),
false,
-1,
null,
ConsistencyLevel.SERIAL, Long.MIN_VALUE);
private final EnumSet flags = EnumSet.noneOf(QueryFlag.class);
private final Message.Request.Type requestType;
final ConsistencyLevel consistency;
final List positionalValues;
final Map namedValues;
final boolean skipMetadata;
final int pageSize;
final ByteBuffer pagingState;
final ConsistencyLevel serialConsistency;
final long defaultTimestamp;
QueryProtocolOptions(Message.Request.Type requestType,
ConsistencyLevel consistency,
List positionalValues,
Map namedValues,
boolean skipMetadata,
int pageSize,
ByteBuffer pagingState,
ConsistencyLevel serialConsistency,
long defaultTimestamp) {
Preconditions.checkArgument(positionalValues.isEmpty() || namedValues.isEmpty());
this.requestType = requestType;
this.consistency = consistency;
this.positionalValues = positionalValues;
this.namedValues = namedValues;
this.skipMetadata = skipMetadata;
this.pageSize = pageSize;
this.pagingState = pagingState;
this.serialConsistency = serialConsistency;
this.defaultTimestamp = defaultTimestamp;
// Populate flags
if (!positionalValues.isEmpty())
flags.add(QueryFlag.VALUES);
if (!namedValues.isEmpty()) {
flags.add(QueryFlag.VALUES);
flags.add(QueryFlag.VALUE_NAMES);
}
if (skipMetadata)
flags.add(QueryFlag.SKIP_METADATA);
if (pageSize >= 0)
flags.add(QueryFlag.PAGE_SIZE);
if (pagingState != null)
flags.add(QueryFlag.PAGING_STATE);
if (serialConsistency != ConsistencyLevel.SERIAL)
flags.add(QueryFlag.SERIAL_CONSISTENCY);
if (defaultTimestamp != Long.MIN_VALUE)
flags.add(QueryFlag.DEFAULT_TIMESTAMP);
}
QueryProtocolOptions copy(ConsistencyLevel newConsistencyLevel) {
return new QueryProtocolOptions(requestType, newConsistencyLevel, positionalValues, namedValues, skipMetadata, pageSize, pagingState, serialConsistency, defaultTimestamp);
}
void encode(ByteBuf dest, ProtocolVersion version) {
switch (version) {
case V1:
// only EXECUTE messages have variables in V1, and their list must be written
// even if it is empty; and they are never named
if (requestType == Message.Request.Type.EXECUTE)
CBUtil.writeValueList(positionalValues, dest);
CBUtil.writeConsistencyLevel(consistency, dest);
break;
case V2:
case V3:
case V4:
CBUtil.writeConsistencyLevel(consistency, dest);
dest.writeByte((byte) QueryFlag.serialize(flags));
if (flags.contains(QueryFlag.VALUES)) {
if (flags.contains(QueryFlag.VALUE_NAMES)) {
assert version.compareTo(ProtocolVersion.V3) >= 0;
CBUtil.writeNamedValueList(namedValues, dest);
} else {
CBUtil.writeValueList(positionalValues, dest);
}
}
if (flags.contains(QueryFlag.PAGE_SIZE))
dest.writeInt(pageSize);
if (flags.contains(QueryFlag.PAGING_STATE))
CBUtil.writeValue(pagingState, dest);
if (flags.contains(QueryFlag.SERIAL_CONSISTENCY))
CBUtil.writeConsistencyLevel(serialConsistency, dest);
if (version.compareTo(ProtocolVersion.V3) >= 0 && flags.contains(QueryFlag.DEFAULT_TIMESTAMP))
dest.writeLong(defaultTimestamp);
break;
default:
throw version.unsupported();
}
}
int encodedSize(ProtocolVersion version) {
switch (version) {
case V1:
// only EXECUTE messages have variables in V1, and their list must be written
// even if it is empty; and they are never named
return (requestType == Message.Request.Type.EXECUTE ? CBUtil.sizeOfValueList(positionalValues) : 0)
+ CBUtil.sizeOfConsistencyLevel(consistency);
case V2:
case V3:
case V4:
int size = 0;
size += CBUtil.sizeOfConsistencyLevel(consistency);
size += 1; // flags
if (flags.contains(QueryFlag.VALUES)) {
if (flags.contains(QueryFlag.VALUE_NAMES)) {
assert version.compareTo(ProtocolVersion.V3) >= 0;
size += CBUtil.sizeOfNamedValueList(namedValues);
} else {
size += CBUtil.sizeOfValueList(positionalValues);
}
}
if (flags.contains(QueryFlag.PAGE_SIZE))
size += 4;
if (flags.contains(QueryFlag.PAGING_STATE))
size += CBUtil.sizeOfValue(pagingState);
if (flags.contains(QueryFlag.SERIAL_CONSISTENCY))
size += CBUtil.sizeOfConsistencyLevel(serialConsistency);
if (version == ProtocolVersion.V3 && flags.contains(QueryFlag.DEFAULT_TIMESTAMP))
size += 8;
return size;
default:
throw version.unsupported();
}
}
@Override
public String toString() {
return String.format("[cl=%s, positionalVals=%s, namedVals=%s, skip=%b, psize=%d, state=%s, serialCl=%s]",
consistency, positionalValues, namedValues, skipMetadata, pageSize, pagingState, serialConsistency);
}
}
static class Batch extends Message.Request {
static final Message.Coder coder = new Message.Coder() {
@Override
public void encode(Batch msg, ByteBuf dest, ProtocolVersion version) {
int queries = msg.queryOrIdList.size();
assert queries <= 0xFFFF;
dest.writeByte(fromType(msg.type));
dest.writeShort(queries);
for (int i = 0; i < queries; i++) {
Object q = msg.queryOrIdList.get(i);
dest.writeByte((byte) (q instanceof String ? 0 : 1));
if (q instanceof String)
CBUtil.writeLongString((String) q, dest);
else
CBUtil.writeBytes(((MD5Digest) q).bytes, dest);
CBUtil.writeValueList(msg.values.get(i), dest);
}
msg.options.encode(dest, version);
}
@Override
public int encodedSize(Batch msg, ProtocolVersion version) {
int size = 3; // type + nb queries
for (int i = 0; i < msg.queryOrIdList.size(); i++) {
Object q = msg.queryOrIdList.get(i);
size += 1 + (q instanceof String
? CBUtil.sizeOfLongString((String) q)
: CBUtil.sizeOfBytes(((MD5Digest) q).bytes));
size += CBUtil.sizeOfValueList(msg.values.get(i));
}
size += msg.options.encodedSize(version);
return size;
}
private byte fromType(BatchStatement.Type type) {
switch (type) {
case LOGGED:
return 0;
case UNLOGGED:
return 1;
case COUNTER:
return 2;
default:
throw new AssertionError();
}
}
};
final BatchStatement.Type type;
final List