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/*
* Copyright 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.datastax.driver.core.Frame.Header;
import com.datastax.driver.core.Requests.QueryFlag;
import com.datastax.driver.core.exceptions.UnsupportedFeatureException;
import com.google.common.collect.ImmutableList;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* A statement that groups a number of {@link Statement} so they get executed as a batch.
*
* Note: BatchStatement is not supported with the native protocol version 1: you will get an
* {@link UnsupportedFeatureException} when submitting one if version 1 of the protocol is in use
* (i.e. if you've force version 1 through {@link Cluster.Builder#withProtocolVersion} or you use
* Cassandra 1.2). Note however that you can still use CQL Batch statements even with
* the protocol version 1.
*
*
Setting a BatchStatement's serial consistency level is only supported with the native protocol
* version 3 or higher (see {@link #setSerialConsistencyLevel(ConsistencyLevel)}).
*/
public class BatchStatement extends Statement {
/** The type of batch to use. */
public enum Type {
/**
* A logged batch: Cassandra will first write the batch to its distributed batch log to ensure
* the atomicity of the batch (atomicity meaning that if any statement in the batch succeeds,
* all will eventually succeed).
*/
LOGGED,
/**
* A batch that doesn't use Cassandra's distributed batch log. Such batch are not guaranteed to
* be atomic.
*/
UNLOGGED,
/**
* A counter batch. Note that such batch is the only type that can contain counter operations
* and it can only contain these.
*/
COUNTER
}
final Type batchType;
private final List statements = new ArrayList();
/** Creates a new {@code LOGGED} batch statement. */
public BatchStatement() {
this(Type.LOGGED);
}
/**
* Creates a new batch statement of the provided type.
*
* @param batchType the type of batch.
*/
public BatchStatement(Type batchType) {
this.batchType = batchType;
}
IdAndValues getIdAndValues(ProtocolVersion protocolVersion, CodecRegistry codecRegistry) {
IdAndValues idAndVals = new IdAndValues(statements.size());
for (int i = 0; i < statements.size(); i++) {
Statement statement = statements.get(i);
if (statement instanceof StatementWrapper) {
statement = ((StatementWrapper) statement).getWrappedStatement();
}
if (statement instanceof RegularStatement) {
RegularStatement st = (RegularStatement) statement;
ByteBuffer[] vals = st.getValues(protocolVersion, codecRegistry);
String query = st.getQueryString(codecRegistry);
idAndVals.ids.add(query);
idAndVals.values[i] = vals == null ? Requests.EMPTY_BB_ARRAY : vals;
} else {
// We handle BatchStatement in add() so ...
assert statement instanceof BoundStatement;
BoundStatement st = (BoundStatement) statement;
idAndVals.ids.add(st.statement.getPreparedId().boundValuesMetadata.id);
idAndVals.values[i] = st.wrapper.values;
}
}
return idAndVals;
}
/**
* Adds a new statement to this batch.
*
* Note that {@code statement} can be any {@code Statement}. It is allowed to mix {@code
* RegularStatement} and {@code BoundStatement} in the same {@code BatchStatement} in particular.
* Adding another {@code BatchStatement} is also allowed for convenience and is equivalent to
* adding all the {@code Statement} contained in that other {@code BatchStatement}.
*
*
Due to a protocol-level limitation, adding a {@code RegularStatement} with named values is
* currently not supported; an {@code IllegalArgument} will be thrown.
*
*
When adding a {@code BoundStatement}, all of its values must be set, otherwise an {@code
* IllegalStateException} will be thrown when submitting the batch statement. See {@link
* BoundStatement} for more details, in particular how to handle {@code null} values.
*
*
Please note that the options of the added Statement (all those defined directly by the
* {@link Statement} class: consistency level, fetch size, tracing, ...) will be ignored for the
* purpose of the execution of the Batch. Instead, the options used are the one of this {@code
* BatchStatement} object.
*
* @param statement the new statement to add.
* @return this batch statement.
* @throws IllegalStateException if adding the new statement means that this {@code
* BatchStatement} has more than 65536 statements (since this is the maximum number of
* statements for a BatchStatement allowed by the underlying protocol).
* @throws IllegalArgumentException if adding a regular statement that uses named values.
*/
public BatchStatement add(Statement statement) {
if (statement instanceof StatementWrapper) {
statement = ((StatementWrapper) statement).getWrappedStatement();
}
if ((statement instanceof RegularStatement)
&& ((RegularStatement) statement).usesNamedValues()) {
throw new IllegalArgumentException(
"Batch statement cannot contain regular statements with named values ("
+ ((RegularStatement) statement).getQueryString()
+ ")");
}
// We handle BatchStatement here (rather than in getIdAndValues) as it make it slightly
// easier to avoid endless loops if the user mistakenly passes a batch that depends on this
// object (or this directly).
if (statement instanceof BatchStatement) {
for (Statement subStatements : ((BatchStatement) statement).statements) {
add(subStatements);
}
} else {
if (statements.size() >= 0xFFFF)
throw new IllegalStateException(
"Batch statement cannot contain more than " + 0xFFFF + " statements.");
statements.add(statement);
}
return this;
}
/**
* Adds multiple statements to this batch.
*
*
This is a shortcut method that calls {@link #add} on all the statements from {@code
* statements}.
*
* @param statements the statements to add.
* @return this batch statement.
*/
public BatchStatement addAll(Iterable statements) {
for (Statement statement : statements) add(statement);
return this;
}
/**
* The statements that have been added to this batch so far.
*
* @return an (immutable) collection of the statements that have been added to this batch so far.
*/
public Collection getStatements() {
return ImmutableList.copyOf(statements);
}
/**
* Clears this batch, removing all statements added so far.
*
* @return this (now empty) {@code BatchStatement}.
*/
public BatchStatement clear() {
statements.clear();
return this;
}
/**
* Returns the number of elements in this batch.
*
* @return the number of elements in this batch.
*/
public int size() {
return statements.size();
}
@Override
public int requestSizeInBytes(ProtocolVersion protocolVersion, CodecRegistry codecRegistry) {
int size = Header.lengthFor(protocolVersion) + 3; // type + nb queries
try {
BatchStatement.IdAndValues idAndVals = getIdAndValues(protocolVersion, codecRegistry);
for (int i = 0; i < idAndVals.ids.size(); i++) {
Object q = idAndVals.ids.get(i);
size +=
1
+ (q instanceof String
? CBUtil.sizeOfLongString((String) q)
: CBUtil.sizeOfShortBytes(((MD5Digest) q).bytes));
size += CBUtil.sizeOfValueList(idAndVals.values[i]);
}
switch (protocolVersion) {
case V2:
size += CBUtil.sizeOfConsistencyLevel(getConsistencyLevel());
break;
case V3:
case V4:
case V5:
size += CBUtil.sizeOfConsistencyLevel(getConsistencyLevel());
size += QueryFlag.serializedSize(protocolVersion);
// Serial CL and default timestamp also depend on session-level defaults (QueryOptions).
// We always count them to avoid having to inject QueryOptions here, at worst we
// overestimate by a
// few bytes.
size += CBUtil.sizeOfConsistencyLevel(getSerialConsistencyLevel());
if (ProtocolFeature.CLIENT_TIMESTAMPS.isSupportedBy(protocolVersion)) {
size += 8; // timestamp
}
if (ProtocolFeature.CUSTOM_PAYLOADS.isSupportedBy(protocolVersion)
&& getOutgoingPayload() != null) {
size += CBUtil.sizeOfBytesMap(getOutgoingPayload());
}
break;
default:
throw protocolVersion.unsupported();
}
} catch (Exception e) {
size = -1;
}
return size;
}
/**
* Sets the serial consistency level for the query.
*
* This is only supported with version 3 or higher of the native protocol. If you call this
* method when version 2 is in use, you will get an {@link UnsupportedFeatureException} when
* submitting the statement. With version 2, protocol batches with conditions have their serial
* consistency level hardcoded to SERIAL; if you need to execute a batch with LOCAL_SERIAL, you
* will have to use a CQL batch.
*
* @param serialConsistency the serial consistency level to set.
* @return this {@code Statement} object.
* @throws IllegalArgumentException if {@code serialConsistency} is not one of {@code
* ConsistencyLevel.SERIAL} or {@code ConsistencyLevel.LOCAL_SERIAL}.
* @see Statement#setSerialConsistencyLevel(ConsistencyLevel)
*/
@Override
public BatchStatement setSerialConsistencyLevel(ConsistencyLevel serialConsistency) {
return (BatchStatement) super.setSerialConsistencyLevel(serialConsistency);
}
@Override
public ByteBuffer getRoutingKey(ProtocolVersion protocolVersion, CodecRegistry codecRegistry) {
for (Statement statement : statements) {
if (statement instanceof StatementWrapper)
statement = ((StatementWrapper) statement).getWrappedStatement();
ByteBuffer rk = statement.getRoutingKey(protocolVersion, codecRegistry);
if (rk != null) return rk;
}
return null;
}
@Override
public String getKeyspace() {
for (Statement statement : statements) {
String keyspace = statement.getKeyspace();
if (keyspace != null) return keyspace;
}
return null;
}
@Override
public Boolean isIdempotent() {
if (idempotent != null) {
return idempotent;
}
return isBatchIdempotent(statements);
}
void ensureAllSet() {
for (Statement statement : statements)
if (statement instanceof BoundStatement) ((BoundStatement) statement).ensureAllSet();
}
static class IdAndValues {
public final List