| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.asterix.metadata.entitytupletranslators; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInput; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Calendar; |
| import java.util.List; |
| |
| import edu.uci.ics.asterix.builders.UnorderedListBuilder; |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.metadata.MetadataException; |
| import edu.uci.ics.asterix.metadata.bootstrap.MetadataPrimaryIndexes; |
| import edu.uci.ics.asterix.metadata.bootstrap.MetadataRecordTypes; |
| import edu.uci.ics.asterix.metadata.entities.NodeGroup; |
| import edu.uci.ics.asterix.om.base.ARecord; |
| import edu.uci.ics.asterix.om.base.AString; |
| import edu.uci.ics.asterix.om.base.AUnorderedList; |
| import edu.uci.ics.asterix.om.base.IACursor; |
| import edu.uci.ics.asterix.om.types.AUnorderedListType; |
| import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| |
| /** |
| * Translates a NodeGroup metadata entity to an ITupleReference and vice versa. |
| */ |
| public class NodeGroupTupleTranslator extends AbstractTupleTranslator<NodeGroup> { |
| |
| // Field indexes of serialized NodeGroup in a tuple. |
| // First key field. |
| public static final int NODEGROUP_NODEGROUPNAME_TUPLE_FIELD_INDEX = 0; |
| // Payload field containing serialized NodeGroup. |
| public static final int NODEGROUP_PAYLOAD_TUPLE_FIELD_INDEX = 1; |
| |
| private UnorderedListBuilder listBuilder = new UnorderedListBuilder(); |
| private ArrayBackedValueStorage itemValue = new ArrayBackedValueStorage(); |
| private List<String> nodeNames; |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ARecord> recordSerDes = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(MetadataRecordTypes.NODEGROUP_RECORDTYPE); |
| |
| public NodeGroupTupleTranslator(boolean getTuple) { |
| super(getTuple, MetadataPrimaryIndexes.NODEGROUP_DATASET.getFieldCount()); |
| } |
| |
| @Override |
| public NodeGroup getMetadataEntytiFromTuple(ITupleReference frameTuple) throws IOException { |
| byte[] serRecord = frameTuple.getFieldData(NODEGROUP_PAYLOAD_TUPLE_FIELD_INDEX); |
| int recordStartOffset = frameTuple.getFieldStart(NODEGROUP_PAYLOAD_TUPLE_FIELD_INDEX); |
| int recordLength = frameTuple.getFieldLength(NODEGROUP_PAYLOAD_TUPLE_FIELD_INDEX); |
| ByteArrayInputStream stream = new ByteArrayInputStream(serRecord, recordStartOffset, recordLength); |
| DataInput in = new DataInputStream(stream); |
| ARecord nodeGroupRecord = (ARecord) recordSerDes.deserialize(in); |
| String gpName = ((AString) nodeGroupRecord |
| .getValueByPos(MetadataRecordTypes.NODEGROUP_ARECORD_GROUPNAME_FIELD_INDEX)).getStringValue(); |
| IACursor cursor = ((AUnorderedList) nodeGroupRecord |
| .getValueByPos(MetadataRecordTypes.NODEGROUP_ARECORD_NODENAMES_FIELD_INDEX)).getCursor(); |
| List<String> nodeNames = new ArrayList<String>(); |
| while (cursor.next()) { |
| nodeNames.add(((AString) cursor.get()).getStringValue()); |
| } |
| return new NodeGroup(gpName, nodeNames); |
| } |
| |
| @Override |
| public ITupleReference getTupleFromMetadataEntity(NodeGroup instance) throws IOException, MetadataException { |
| // write the key in the first field of the tuple |
| tupleBuilder.reset(); |
| aString.setValue(instance.getNodeGroupName()); |
| stringSerde.serialize(aString, tupleBuilder.getDataOutput()); |
| tupleBuilder.addFieldEndOffset(); |
| |
| // write the payload in the second field of the tuple |
| recordBuilder.reset(MetadataRecordTypes.NODEGROUP_RECORDTYPE); |
| // write field 0 |
| fieldValue.reset(); |
| aString.setValue(instance.getNodeGroupName()); |
| stringSerde.serialize(aString, fieldValue.getDataOutput()); |
| recordBuilder.addField(MetadataRecordTypes.NODEGROUP_ARECORD_GROUPNAME_FIELD_INDEX, fieldValue); |
| |
| // write field 1 |
| listBuilder |
| .reset((AUnorderedListType) MetadataRecordTypes.NODEGROUP_RECORDTYPE.getFieldTypes()[MetadataRecordTypes.NODEGROUP_ARECORD_NODENAMES_FIELD_INDEX]); |
| this.nodeNames = instance.getNodeNames(); |
| for (String nodeName : this.nodeNames) { |
| itemValue.reset(); |
| aString.setValue(nodeName); |
| stringSerde.serialize(aString, itemValue.getDataOutput()); |
| listBuilder.addItem(itemValue); |
| } |
| fieldValue.reset(); |
| listBuilder.write(fieldValue.getDataOutput(), true); |
| recordBuilder.addField(MetadataRecordTypes.NODEGROUP_ARECORD_NODENAMES_FIELD_INDEX, fieldValue); |
| |
| // write field 2 |
| fieldValue.reset(); |
| aString.setValue(Calendar.getInstance().getTime().toString()); |
| stringSerde.serialize(aString, fieldValue.getDataOutput()); |
| recordBuilder.addField(MetadataRecordTypes.NODEGROUP_ARECORD_TIMESTAMP_FIELD_INDEX, fieldValue); |
| |
| try { |
| recordBuilder.write(tupleBuilder.getDataOutput(), true); |
| } catch (AsterixException e) { |
| throw new MetadataException(e); |
| } |
| tupleBuilder.addFieldEndOffset(); |
| |
| tuple.reset(tupleBuilder.getFieldEndOffsets(), tupleBuilder.getByteArray()); |
| return tuple; |
| } |
| } |