asterixdb/asterix-runtime/src/main/java/org/apache/asterix/runtime/evaluators/functions/temporal/IntervalPartitionJoinFunction.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.asterix.runtime.evaluators.functions.temporal;

import java.io.DataOutput;

import org.apache.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer;
import org.apache.asterix.dataflow.data.nontagged.serde.AIntervalSerializerDeserializer;
import org.apache.asterix.formats.nontagged.AqlSerializerDeserializerProvider;
import org.apache.asterix.om.base.AInt32;
import org.apache.asterix.om.base.AMutableInt32;
import org.apache.asterix.om.types.ATypeTag;
import org.apache.asterix.om.types.BuiltinType;
import org.apache.asterix.om.types.EnumDeserializer;
import org.apache.asterix.runtime.operators.joins.intervalpartition.IntervalPartitionUtil;
import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import org.apache.hyracks.api.context.IHyracksTaskContext;
import org.apache.hyracks.api.dataflow.value.IRangeMap;
import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.data.std.api.IPointable;
import org.apache.hyracks.data.std.primitive.LongPointable;
import org.apache.hyracks.data.std.primitive.VoidPointable;
import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
import org.apache.hyracks.dataflow.std.misc.RangeForwardOperatorDescriptor.RangeForwardTaskState;

public class IntervalPartitionJoinFunction implements IScalarEvaluator {

    private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
    private DataOutput out = resultStorage.getDataOutput();
    private IPointable argPtr0 = new VoidPointable();
    private IPointable argPtr1 = new VoidPointable();
    private IPointable argPtr2 = new VoidPointable();
    private int rangeIdCache = -1;
    private long partitionStart;
    private long partitionDuration;

    @SuppressWarnings("unchecked")
    private ISerializerDeserializer<AInt32> intSerde = AqlSerializerDeserializerProvider.INSTANCE
            .getSerializerDeserializer(BuiltinType.AINT32);
    private AMutableInt32 aInt = new AMutableInt32(0);

    private IHyracksTaskContext ctx;
    private IScalarEvaluator eval0;
    private IScalarEvaluator eval1;
    private IScalarEvaluator eval2;
    private boolean startPoint;

    public IntervalPartitionJoinFunction(IScalarEvaluatorFactory[] args, IHyracksTaskContext ctx, boolean startPoint)
            throws AlgebricksException {
        this.ctx = ctx;
        this.eval0 = args[0].createScalarEvaluator(ctx);
        this.eval1 = args[1].createScalarEvaluator(ctx);
        this.eval2 = args[2].createScalarEvaluator(ctx);
        this.startPoint = startPoint;
    }

    public void evaluate(IFrameTupleReference tuple, IPointable result) throws AlgebricksException {
        resultStorage.reset();
        // Interval
        eval0.evaluate(tuple, argPtr0);
        // rangeId
        eval1.evaluate(tuple, argPtr1);
        // k
        eval2.evaluate(tuple, argPtr2);

        byte[] bytes0 = argPtr0.getByteArray();
        int offset0 = argPtr0.getStartOffset();
        byte[] bytes1 = argPtr1.getByteArray();
        int offset1 = argPtr1.getStartOffset();
        byte[] bytes2 = argPtr2.getByteArray();
        int offset2 = argPtr2.getStartOffset();

        try {
            if (bytes0[offset0] != ATypeTag.SERIALIZED_INTERVAL_TYPE_TAG) {
                throw new AlgebricksException("Expected type INTERVAL for parameter 0 but got "
                        + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes0[offset0]));
            }

            if (bytes1[offset1] != ATypeTag.SERIALIZED_INT32_TYPE_TAG) {
                throw new AlgebricksException("Expected type INT32 for parameter 1 but got "
                        + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes1[offset1]));
            }

            if (bytes2[offset2] != ATypeTag.SERIALIZED_INT32_TYPE_TAG) {
                throw new AlgebricksException("Expected type INT32 for parameter 2 but got "
                        + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes2[offset2]));
            }

            long point;
            if (startPoint) {
                point = AIntervalSerializerDeserializer.getIntervalStart(bytes0, offset0 + 1);
            } else {
                point = AIntervalSerializerDeserializer.getIntervalEnd(bytes0, offset0 + 1);
            }
            int rangeId = AInt32SerializerDeserializer.getInt(bytes1, offset1 + 1);
            int k = AInt32SerializerDeserializer.getInt(bytes2, offset2 + 1);

            if (rangeId != rangeIdCache) {
                // Only load new values if the range changed.
                RangeForwardTaskState rangeState = RangeForwardTaskState.getRangeState(rangeId, ctx);
                IRangeMap rangeMap = rangeState.getRangeMap();
                partitionStart = LongPointable.getLong(rangeMap.getMinByteArray(0), rangeMap.getMinStartOffset(0) + 1);
                long partitionEnd = LongPointable.getLong(rangeMap.getMaxByteArray(0),
                        rangeMap.getMaxStartOffset(0) + 1);
                partitionDuration = IntervalPartitionUtil.getPartitionDuration(partitionStart, partitionEnd, k);
                rangeIdCache = rangeId;
            }

            int partition = IntervalPartitionUtil.getIntervalPartition(point, partitionStart, partitionDuration, k);
            aInt.setValue(partition);
            intSerde.serialize(aInt, out);
        } catch (HyracksDataException hex) {
            throw new AlgebricksException(hex);
        }
        result.set(resultStorage);
    }

}