hbase-client/src/main/java/org/apache/hadoop/hbase/client/BalancerDecision.java

   1 /*
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 package org.apache.hadoop.hbase.client;
  21
  22 import java.util.List;
  23
  24 import org.apache.commons.lang3.builder.ToStringBuilder;
  25 import org.apache.hadoop.hbase.util.GsonUtil;
  26 import org.apache.yetus.audience.InterfaceAudience;
  27 import org.apache.yetus.audience.InterfaceStability;
  28
  29 import org.apache.hbase.thirdparty.com.google.gson.Gson;
  30 import org.apache.hbase.thirdparty.com.google.gson.JsonSerializer;
  31
  32 /**
  33  * History of balancer decisions taken for region movements.
  34  */
  35 @InterfaceAudience.Public
  36 @InterfaceStability.Evolving
  37 final public class BalancerDecision extends LogEntry {
  38
  39   private final String initialFunctionCosts;
  40   private final String finalFunctionCosts;
  41   private final double initTotalCost;
  42   private final double computedTotalCost;
  43   private final long computedSteps;
  44   private final List<String> regionPlans;
  45
  46   // used to convert object to pretty printed format
  47   // used by toJsonPrettyPrint()
  48   private static final Gson GSON = GsonUtil.createGson()
  49     .setPrettyPrinting()
  50     .registerTypeAdapter(BalancerDecision.class, (JsonSerializer<BalancerDecision>)
  51       (balancerDecision, type, jsonSerializationContext) -> {
  52         Gson gson = new Gson();
  53         return gson.toJsonTree(balancerDecision);
  54       }).create();
  55
  56   private BalancerDecision(String initialFunctionCosts, String finalFunctionCosts,
  57       double initTotalCost, double computedTotalCost, List<String> regionPlans,
  58       long computedSteps) {
  59     this.initialFunctionCosts = initialFunctionCosts;
  60     this.finalFunctionCosts = finalFunctionCosts;
  61     this.initTotalCost = initTotalCost;
  62     this.computedTotalCost = computedTotalCost;
  63     this.regionPlans = regionPlans;
  64     this.computedSteps = computedSteps;
  65   }
  66
  67   public String getInitialFunctionCosts() {
  68     return initialFunctionCosts;
  69   }
  70
  71   public String getFinalFunctionCosts() {
  72     return finalFunctionCosts;
  73   }
  74
  75   public double getInitTotalCost() {
  76     return initTotalCost;
  77   }
  78
  79   public double getComputedTotalCost() {
  80     return computedTotalCost;
  81   }
  82
  83   public List<String> getRegionPlans() {
  84     return regionPlans;
  85   }
  86
  87   public long getComputedSteps() {
  88     return computedSteps;
  89   }
  90
  91   @Override
  92   public String toString() {
  93     return new ToStringBuilder(this)
  94       .append("initialFunctionCosts", initialFunctionCosts)
  95       .append("finalFunctionCosts", finalFunctionCosts)
  96       .append("initTotalCost", initTotalCost)
  97       .append("computedTotalCost", computedTotalCost)
  98       .append("computedSteps", computedSteps)
  99       .append("regionPlans", regionPlans)
 100       .toString();
 101   }
 102
 103   @Override
 104   public String toJsonPrettyPrint() {
 105     return GSON.toJson(this);
 106   }
 107
 108   public static class Builder {
 109     private String initialFunctionCosts;
 110     private String finalFunctionCosts;
 111     private double initTotalCost;
 112     private double computedTotalCost;
 113     private long computedSteps;
 114     private List<String> regionPlans;
 115
 116     public Builder setInitialFunctionCosts(String initialFunctionCosts) {
 117       this.initialFunctionCosts = initialFunctionCosts;
 118       return this;
 119     }
 120
 121     public Builder setFinalFunctionCosts(String finalFunctionCosts) {
 122       this.finalFunctionCosts = finalFunctionCosts;
 123       return this;
 124     }
 125
 126     public Builder setInitTotalCost(double initTotalCost) {
 127       this.initTotalCost = initTotalCost;
 128       return this;
 129     }
 130
 131     public Builder setComputedTotalCost(double computedTotalCost) {
 132       this.computedTotalCost = computedTotalCost;
 133       return this;
 134     }
 135
 136     public Builder setRegionPlans(List<String> regionPlans) {
 137       this.regionPlans = regionPlans;
 138       return this;
 139     }
 140
 141     public Builder setComputedSteps(long computedSteps) {
 142       this.computedSteps = computedSteps;
 143       return this;
 144     }
 145
 146     public BalancerDecision build() {
 147       return new BalancerDecision(initialFunctionCosts, finalFunctionCosts,
 148         initTotalCost, computedTotalCost, regionPlans, computedSteps);
 149     }
 150   }
 151
 152 }