/*
* 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.geode.redis.internal.executor.hll;
import java.util.ArrayList;
import java.util.List;
import org.apache.geode.cache.Region;
import org.apache.geode.internal.hll.CardinalityMergeException;
import org.apache.geode.internal.hll.HyperLogLogPlus;
import org.apache.geode.redis.internal.ByteArrayWrapper;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.Command;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;
import org.apache.geode.redis.internal.RedisDataType;
public class PFCountExecutor extends HllExecutor {
@Override
public void executeCommand(Command command, ExecutionHandlerContext context) {
List<byte[]> commandElems = command.getProcessedCommand();
if (commandElems.size() < 2) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.PFCOUNT));
return;
}
Region<ByteArrayWrapper, HyperLogLogPlus> keyRegion =
context.getRegionProvider().gethLLRegion();
List<HyperLogLogPlus> hlls = new ArrayList<HyperLogLogPlus>();
for (int i = 1; i < commandElems.size(); i++) {
ByteArrayWrapper k = new ByteArrayWrapper(commandElems.get(i));
checkDataType(k, RedisDataType.REDIS_HLL, context);
HyperLogLogPlus h = keyRegion.get(k);
if (h != null)
hlls.add(h);
}
if (hlls.isEmpty()) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
HyperLogLogPlus tmp = hlls.remove(0);
HyperLogLogPlus[] estimators = hlls.toArray(new HyperLogLogPlus[hlls.size()]);
try {
tmp = (HyperLogLogPlus) tmp.merge(estimators);
} catch (CardinalityMergeException e) {
throw new RuntimeException(e);
}
long cardinality = tmp.cardinality();
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), cardinality));
}
}