content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.eagleeye;
  
  import java.util.Arrays;
  import java.util.List;
  
  public final class StatEntry {
  
      private final StatLogger statLogger;
  
      private final String[] keys;
      private transient int hash;
  
      public StatEntry(StatLogger statLogger, String key) {
          this.statLogger = statLogger;
          this.keys = new String[] {key};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3, String key4) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3, key4};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3, String key4, String key5) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3, key4, key5};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3, String key4, String key5,
                       String key6) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3, key4, key5, key6};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3, String key4, String key5,
                       String key6, String key7) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3, key4, key5, key6, key7};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String key2, String key3, String key4, String key5,
                       String key6, String key7, String key8) {
          this.statLogger = statLogger;
          this.keys = new String[] {key1, key2, key3, key4, key5, key6, key7, key8};
      }
  
      public StatEntry(StatLogger statLogger, String key1, String... moreKeys) {
          String[] keys = new String[1 + moreKeys.length];
          keys[0] = key1;
          for (int i = 0; i < moreKeys.length; ++i) {
              keys[i + 1] = moreKeys[i];
          }
          this.statLogger = statLogger;
          this.keys = keys;
      }
  
      public StatEntry(StatLogger statLogger, List<String> keys) {
          if (keys == null || keys.isEmpty()) {
              throw new IllegalArgumentException("keys empty or null: " + keys);
          }
          this.statLogger = statLogger;
          this.keys = keys.toArray(new String[keys.size()]);
      }
  
      public StatEntry(StatLogger statLogger, String[] keys) {
          if (keys == null || keys.length == 0) {
              throw new IllegalArgumentException("keys empty or null");
          }
          this.statLogger = statLogger;
          this.keys = Arrays.copyOf(keys, keys.length);
      }
  
      public String[] getKeys() {
          return keys;
      }
  
      void appendTo(StringBuilder appender, char delimiter) {
          final int len = keys.length;
          if (len > 0) {
              appender.append(keys[0]);
              for (int i = 1; i < len; ++i) {
                  appender.append(delimiter).append(keys[i]);
              }
          }
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder(64);
          sb.append("StatKeys [");
          appendTo(sb, ',');
          sb.append("]");
          return sb.toString();
      }
  
      @Override
      public int hashCode() {
          if (hash == 0) {
              int result = 1;
              result = 31 * result + Arrays.hashCode(keys);
              hash = result;
          }
          return hash;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          StatEntry other = (StatEntry)obj;
          if (hash != 0 && other.hash != 0 && hash != other.hash) {
              return false;
          }
          if (!Arrays.equals(keys, other.keys)) {
              return false;
          }
  
          return true;
      }
  
      StatEntryFunc getFunc(final StatEntryFuncFactory factory) {
          return this.statLogger.getRollingData().getStatEntryFunc(this, factory);
      }
  
      public void count() {
          count(1);
      }
  
      public void count(long count) {
          getFunc(StatEntryFuncFactory.COUNT_SUM).count(count);
      }
  
      public void countAndSum(long valueToSum) {
          countAndSum(1, valueToSum);
      }
  
      public void countAndSum(long count, long valueToSum) {
          getFunc(StatEntryFuncFactory.COUNT_SUM).countAndSum(count, valueToSum);
      }
  
      public void minMax(long candidate) {
          minMax(candidate, null);
      }
  
      public void minMax(long candidate, String ref) {
          getFunc(StatEntryFuncFactory.MIN_MAX).minMax(candidate, ref);
      }
  }
  