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/*
* Copyright (C) 2014 Stratio (http://stratio.com)
*
* 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 org.apache.cassandra.service;
import java.lang.reflect.Method;
import java.util.List;
import java.util.concurrent.TimeUnit;
import com.stratio.cassandra.lucene.Index;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.PartitionRangeReadCommand;
import org.apache.cassandra.db.ReadCommand;
import org.apache.cassandra.db.SinglePartitionReadCommand;
import org.apache.cassandra.db.partitions.PartitionIterator;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.IsBootstrappingException;
import org.apache.cassandra.exceptions.ReadFailureException;
import org.apache.cassandra.exceptions.ReadTimeoutException;
import org.apache.cassandra.exceptions.UnavailableException;
import org.apache.cassandra.metrics.ClientRequestMetrics;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.service.reads.range.LuceneReplicaPlanIterator;
import org.apache.cassandra.service.reads.range.LuceneReplicaPlanMerger;
//import org.apache.cassandra.service.StorageProxy.RangeIterator;
//import org.apache.cassandra.service.StorageProxy.RangeMerger;
/**
* Modified version of Apache Cassandra {@link StorageProxy} to be used with Lucene searches.
*/
public class LuceneStorageProxy {
private static final ClientRequestMetrics readMetrics = new ClientRequestMetrics("Read");
private static Method systemKeyspaceQuery;
private static Method fetchRows;
static {
try {
systemKeyspaceQuery = StorageProxy.class.getDeclaredMethod("systemKeyspaceQuery", List.class);
systemKeyspaceQuery.setAccessible(true);
fetchRows = StorageProxy.class.getDeclaredMethod("fetchRows", List.class, ConsistencyLevel.class, long.class);
fetchRows.setAccessible(true);
} catch (ReflectiveOperationException e) {
throw new RuntimeException(e);
}
}
private static boolean systemKeyspaceQuery(List cmds) throws ReflectiveOperationException {
return (boolean) systemKeyspaceQuery.invoke(null, cmds);
}
private static PartitionIterator fetchRows(List commands, ConsistencyLevel cl, long queryStartNanoTime)
throws ReflectiveOperationException {
return (PartitionIterator) fetchRows.invoke(null, commands, cl, queryStartNanoTime);
}
public static PartitionIterator read(SinglePartitionReadCommand.Group group,
ConsistencyLevel consistencyLevel,
long queryStartNanoTime)
throws UnavailableException, IsBootstrappingException, ReadFailureException, ReadTimeoutException,
InvalidRequestException, ReflectiveOperationException {
if (StorageService.instance.isBootstrapMode() && !systemKeyspaceQuery(group.queries)) {
readMetrics.unavailables.mark();
throw new IsBootstrappingException();
}
return readRegular(group, consistencyLevel, queryStartNanoTime);
}
private static PartitionIterator readRegular(SinglePartitionReadCommand.Group group,
ConsistencyLevel consistencyLevel,
long queryStartNanoTime)
throws UnavailableException, ReadFailureException, ReadTimeoutException, ReflectiveOperationException {
long start = System.nanoTime();
try {
PartitionIterator result = fetchRows(group.queries, consistencyLevel, queryStartNanoTime);
// If we have more than one command, then despite each read command honoring the limit, the total result
// might not honor it and so we should enforce it
if (group.queries.size() > 1) {
ReadCommand command = group.queries.get(0);
TableMetadata metadata = group.metadata();
ColumnFamilyStore cfs = Keyspace.open(metadata.keyspace).getColumnFamilyStore(metadata.name);
Index index = (Index) command.getIndex(cfs);
result = index.postProcessorFor(group).apply(result, group);
result = group.limits().filter(result, group.nowInSec(),true, metadata.enforceStrictLiveness());
}
return result;
} catch (UnavailableException e) {
readMetrics.unavailables.mark();
throw e;
} catch (ReadTimeoutException e) {
readMetrics.timeouts.mark();
throw e;
} catch (ReadFailureException e) {
readMetrics.failures.mark();
throw e;
} finally {
long latency = System.nanoTime() - start;
readMetrics.addNano(latency);
// TODO avoid giving every command the same latency number. Can fix this in CASSANDRA-5329
for (ReadCommand command : group.queries) {
Keyspace.openAndGetStore(command.metadata()).metric.coordinatorReadLatency.update(latency,
TimeUnit.NANOSECONDS);
}
}
}
public static LuceneReplicaPlanMerger rangeMerger(PartitionRangeReadCommand command, ConsistencyLevel consistency)
{
final Keyspace keyspace = Keyspace.open(command.metadata().keyspace);
final LuceneReplicaPlanIterator replicaPlans = new LuceneReplicaPlanIterator(command.dataRange().keyRange(), keyspace, consistency);
return new LuceneReplicaPlanMerger(replicaPlans, keyspace, consistency);
}
}