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CuboidScheduler.java
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CuboidScheduler.java
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/*
* 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.kylin.cube.cuboid;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.apache.kylin.common.util.ClassUtil;
import org.apache.kylin.cube.model.AggregationGroup;
import org.apache.kylin.cube.model.CubeDesc;
import org.apache.kylin.shaded.com.google.common.base.Preconditions;
import org.apache.kylin.shaded.com.google.common.collect.Lists;
/**
* Defines a cuboid tree, rooted by the base cuboid. A parent cuboid generates its child cuboids.
*/
abstract public class CuboidScheduler implements Serializable {
public static CuboidScheduler getInstance(CubeDesc cubeDesc) {
String clzName = cubeDesc.getConfig().getCuboidScheduler();
try {
Class<? extends CuboidScheduler> clz = ClassUtil.forName(clzName, CuboidScheduler.class);
return clz.getConstructor(CubeDesc.class).newInstance(cubeDesc);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
// ============================================================================
final protected CubeDesc cubeDesc;
protected CuboidScheduler(CubeDesc cubeDesc) {
this.cubeDesc = cubeDesc;
}
/** Returns all cuboids on the tree. */
abstract public Set<Long> getAllCuboidIds();
/** Returns the number of all cuboids. */
abstract public int getCuboidCount();
/** Returns the child cuboids of a parent. */
abstract public List<Long> getSpanningCuboid(long parentCuboid);
/** Returns a valid cuboid that best matches the request cuboid. */
abstract public long findBestMatchCuboid(long requestCuboid);
/** optional */
abstract public Set<Long> calculateCuboidsForAggGroup(AggregationGroup agg);
// ============================================================================
private transient List<List<Long>> cuboidsByLayer;
public long getBaseCuboidId() {
return Cuboid.getBaseCuboidId(cubeDesc);
}
public CubeDesc getCubeDesc() {
return cubeDesc;
}
/** Checks whether a cuboid is valid or not. */
public boolean isValid(long requestCuboid) {
return getAllCuboidIds().contains(requestCuboid);
}
/**
* Get cuboids by layer. It's built from pre-expanding tree.
* @return layered cuboids
*/
public List<List<Long>> getCuboidsByLayer() {
if (cuboidsByLayer != null) {
return cuboidsByLayer;
}
int totalNum = 0;
cuboidsByLayer = Lists.newArrayList();
cuboidsByLayer.add(Collections.singletonList(Cuboid.getBaseCuboidId(cubeDesc)));
totalNum++;
List<Long> lastLayer = cuboidsByLayer.get(cuboidsByLayer.size() - 1);
while (!lastLayer.isEmpty()) {
List<Long> newLayer = Lists.newArrayList();
for (Long parent : lastLayer) {
newLayer.addAll(getSpanningCuboid(parent));
}
if (newLayer.isEmpty()) {
break;
}
cuboidsByLayer.add(newLayer);
totalNum += newLayer.size();
lastLayer = newLayer;
}
int size = getAllCuboidIds().size();
Preconditions.checkState(totalNum == size, "total Num: " + totalNum + " actual size: " + size);
return cuboidsByLayer;
}
/**
* Get cuboid level count except base cuboid
* @return
*/
public int getBuildLevel() {
return getCuboidsByLayer().size() - 1;
}
/** Returns the key for what this cuboid scheduler responsible for. */
public String getCuboidCacheKey() {
return cubeDesc.getName();
}
}