// Copyright 2017 JanusGraph Authors
//
// 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.janusgraph.graphdb.olap.job;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import org.janusgraph.core.JanusGraphException;
import org.janusgraph.core.JanusGraph;
import org.janusgraph.core.schema.RelationTypeIndex;
import org.janusgraph.core.schema.SchemaStatus;
import org.janusgraph.core.schema.JanusGraphIndex;
import org.janusgraph.diskstorage.BackendTransaction;
import org.janusgraph.diskstorage.Entry;
import org.janusgraph.diskstorage.EntryList;
import org.janusgraph.diskstorage.StaticBuffer;
import org.janusgraph.diskstorage.configuration.Configuration;
import org.janusgraph.diskstorage.keycolumnvalue.SliceQuery;
import org.janusgraph.diskstorage.keycolumnvalue.cache.KCVSCache;
import org.janusgraph.diskstorage.keycolumnvalue.scan.ScanJob;
import org.janusgraph.diskstorage.keycolumnvalue.scan.ScanMetrics;
import org.janusgraph.diskstorage.util.BufferUtil;
import org.janusgraph.graphdb.database.IndexSerializer;
import org.janusgraph.graphdb.database.management.RelationTypeIndexWrapper;
import org.janusgraph.graphdb.idmanagement.IDManager;
import org.janusgraph.graphdb.internal.InternalRelationType;
import org.janusgraph.graphdb.olap.QueryContainer;
import org.janusgraph.graphdb.olap.VertexJobConverter;
import org.janusgraph.graphdb.transaction.StandardJanusGraphTx;
import org.janusgraph.graphdb.types.CompositeIndexType;
import org.janusgraph.graphdb.types.vertices.JanusGraphSchemaVertex;
import org.apache.tinkerpop.gremlin.structure.Direction;
import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Predicate;
/**
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class IndexRemoveJob extends IndexUpdateJob implements ScanJob {
private final VertexJobConverter.GraphProvider graph = new VertexJobConverter.GraphProvider();
public static final String DELETED_RECORDS_COUNT = "deletes";
private IndexSerializer indexSerializer;
private long graphIndexId;
private IDManager idManager;
public IndexRemoveJob() {
super();
}
protected IndexRemoveJob(IndexRemoveJob copy) {
super(copy);
if (copy.graph.isProvided()) this.graph.setGraph(copy.graph.get());
}
public IndexRemoveJob(final JanusGraph graph, final String indexName, final String indexType) {
super(indexName,indexType);
this.graph.setGraph(graph);
}
@Override
public void workerIterationEnd(ScanMetrics metrics) {
super.workerIterationEnd(metrics);
graph.close();
}
@Override
public void workerIterationStart(Configuration config, Configuration graphConf, ScanMetrics metrics) {
graph.initializeGraph(graphConf);
indexSerializer = graph.get().getIndexSerializer();
idManager = graph.get().getIDManager();
try {
super.workerIterationStart(graph.get(), config, metrics);
} catch (Throwable e) {
graph.close();
throw e;
}
}
@Override
protected void validateIndexStatus() {
if (index instanceof RelationTypeIndex) {
//Nothing specific to be done
} else if (index instanceof JanusGraphIndex) {
JanusGraphIndex gindex = (JanusGraphIndex)index;
if (gindex.isMixedIndex())
throw new UnsupportedOperationException("Cannot remove mixed indexes through JanusGraph. This can " +
"only be accomplished in the indexing system directly.");
CompositeIndexType indexType = (CompositeIndexType)mgmt.getSchemaVertex(index).asIndexType();
graphIndexId = indexType.getID();
} else throw new UnsupportedOperationException("Unsupported index found: "+index);
//Must be a relation type index or a composite graph index
JanusGraphSchemaVertex schemaVertex = mgmt.getSchemaVertex(index);
SchemaStatus actualStatus = schemaVertex.getStatus();
Preconditions.checkArgument(actualStatus==SchemaStatus.DISABLED,"The index [%s] must be disabled before it can be removed",indexName);
}
@Override
public void process(StaticBuffer key, Map<SliceQuery, EntryList> entries, ScanMetrics metrics) {
//The queries are already tailored enough => everything should be removed
try {
BackendTransaction mutator = writeTx.getTxHandle();
final List<Entry> deletions;
if (entries.size()==1) deletions = Iterables.getOnlyElement(entries.values());
else {
int size = IteratorUtils.stream(entries.values().iterator()).map( e -> e.size()).reduce(0, (x,y) -> x+y);
deletions = new ArrayList<>(size);
entries.values().forEach(e -> deletions.addAll(e));
}
metrics.incrementCustom(DELETED_RECORDS_COUNT,deletions.size());
if (isRelationTypeIndex()) {
mutator.mutateEdges(key, KCVSCache.NO_ADDITIONS, deletions);
} else {
mutator.mutateIndex(key, KCVSCache.NO_ADDITIONS, deletions);
}
} catch (final Exception e) {
mgmt.rollback();
writeTx.rollback();
metrics.incrementCustom(FAILED_TX);
throw new JanusGraphException(e.getMessage(), e);
}
}
@Override
public List<SliceQuery> getQueries() {
if (isGlobalGraphIndex()) {
//Everything
return ImmutableList.of(new SliceQuery(BufferUtil.zeroBuffer(1), BufferUtil.oneBuffer(128)));
} else {
RelationTypeIndexWrapper wrapper = (RelationTypeIndexWrapper)index;
InternalRelationType wrappedType = wrapper.getWrappedType();
Direction direction=null;
for (Direction dir : Direction.values()) if (wrappedType.isUnidirected(dir)) direction=dir;
assert direction!=null;
StandardJanusGraphTx tx = (StandardJanusGraphTx)graph.get().buildTransaction().readOnly().start();
try {
QueryContainer qc = new QueryContainer(tx);
qc.addQuery().type(wrappedType).direction(direction).relations();
return qc.getSliceQueries();
} finally {
tx.rollback();
}
}
}
@Override
public Predicate<StaticBuffer> getKeyFilter() {
if (isGlobalGraphIndex()) {
assert graphIndexId>0;
return (k -> {
try {
return indexSerializer.getIndexIdFromKey(k) == graphIndexId;
} catch (RuntimeException e) {
log.error("Filtering key {} due to exception", k, e);
return false;
}
});
} else {
return buffer -> {
long vertexId = idManager.getKeyID(buffer);
if (IDManager.VertexIDType.Invisible.is(vertexId)) return false;
else return true;
};
}
}
@Override
public IndexRemoveJob clone() {
return new IndexRemoveJob(this);
}
}