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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.hadoop.hbase.master.normalizer;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.master.MasterServices;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
/**
* Normalization plan to merge adjacent regions. As with any call to
* {@link MasterServices#mergeRegions(RegionInfo[], boolean, long, long)} with
* {@code forcible=false}, Region order and adjacency are important. It's the caller's
* responsibility to ensure the provided parameters are ordered according to the {code mergeRegions}
* method requirements.
*/
@InterfaceAudience.Private
final class MergeNormalizationPlan implements NormalizationPlan {
private final List normalizationTargets;
private MergeNormalizationPlan(List normalizationTargets) {
Preconditions.checkNotNull(normalizationTargets);
Preconditions.checkState(normalizationTargets.size() >= 2,
"normalizationTargets.size() must be >= 2 but was %s", normalizationTargets.size());
this.normalizationTargets = Collections.unmodifiableList(normalizationTargets);
}
@Override
public PlanType getType() {
return PlanType.MERGE;
}
public List getNormalizationTargets() {
return normalizationTargets;
}
@Override
public long getPlanSizeMb() {
long total = 0;
for (NormalizationTarget target : normalizationTargets) {
total += target.getRegionSizeMb();
}
return total;
}
@Override
public String toString() {
return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
.append("normalizationTargets", normalizationTargets).toString();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
MergeNormalizationPlan that = (MergeNormalizationPlan) o;
return new EqualsBuilder().append(normalizationTargets, that.normalizationTargets).isEquals();
}
@Override
public int hashCode() {
return new HashCodeBuilder(17, 37).append(normalizationTargets).toHashCode();
}
/**
* A helper for constructing instances of {@link MergeNormalizationPlan}.
*/
static class Builder {
private final List normalizationTargets = new LinkedList<>();
public Builder setTargets(final List targets) {
normalizationTargets.clear();
normalizationTargets.addAll(targets);
return this;
}
public Builder addTarget(final RegionInfo regionInfo, final long regionSizeMb) {
normalizationTargets.add(new NormalizationTarget(regionInfo, regionSizeMb));
return this;
}
public MergeNormalizationPlan build() {
return new MergeNormalizationPlan(normalizationTargets);
}
}
}