jon-wei commented on a change in pull request #6581: Moments Sketch custom aggregator URL: https://github.com/apache/incubator-druid/pull/6581#discussion_r246212927
########## File path: extensions-contrib/momentsketch/src/main/java/org/apache/druid/query/aggregation/momentsketch/aggregator/MomentSketchBuildBufferAggregator.java ########## @@ -0,0 +1,94 @@ +/* + * 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.druid.query.aggregation.momentsketch.aggregator; + +import org.apache.druid.query.aggregation.BufferAggregator; +import org.apache.druid.query.aggregation.momentsketch.MomentSketchWrapper; +import org.apache.druid.segment.ColumnValueSelector; + +import java.nio.ByteBuffer; + +public class MomentSketchBuildBufferAggregator implements BufferAggregator +{ + private final ColumnValueSelector<Double> selector; + private final int k; + private final boolean compress; + + public MomentSketchBuildBufferAggregator( + final ColumnValueSelector<Double> valueSelector, + final int k, + final boolean compress + ) + { + this.selector = valueSelector; + this.k = k; + this.compress = compress; + } + + @Override + public synchronized void init(final ByteBuffer buffer, final int position) + { + ByteBuffer mutationBuffer = buffer.duplicate(); + mutationBuffer.position(position); + + MomentSketchWrapper emptyStruct = new MomentSketchWrapper(k); + emptyStruct.setCompressed(compress); + emptyStruct.toBytes(mutationBuffer); + } + + @Override + public synchronized void aggregate(final ByteBuffer buffer, final int position) Review comment: the buffer aggregator doesn't need synchronization, but the non-buffer aggregator does since those are used in realtime ingestion tasks which can be queried as they're ingesting ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
