content: /*
   * 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.cassandra.dht.tokenallocator;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import javax.annotation.Nullable;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableMap;
  
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.dht.tokenallocator.TokenAllocatorBase.TokenInfo;
  import org.apache.cassandra.dht.tokenallocator.TokenAllocatorBase.UnitInfo;
  import org.apache.cassandra.dht.tokenallocator.TokenAllocatorBase.Weighted;
  import org.apache.cassandra.diag.DiagnosticEvent;
  
  /**
   * DiagnosticEvent implementation for {@link TokenAllocator} activities.
   */
  final class TokenAllocatorEvent<Unit> extends DiagnosticEvent
  {
  
      private final TokenAllocatorEventType type;
      private final TokenAllocatorBase<Unit> allocator;
      private final int replicas;
      @Nullable
      private final Integer numTokens;
      @Nullable
      private final Collection<Weighted<UnitInfo>> sortedUnits;
      @Nullable
      private final Map<Unit, Collection<Token>> unitToTokens;
      @Nullable
      private final ImmutableMap<Token, Unit> sortedTokens;
      @Nullable
      private final List<Token> tokens;
      @Nullable
      private final Unit unit;
      @Nullable
      private final TokenInfo<Unit> tokenInfo;
  
      TokenAllocatorEvent(TokenAllocatorEventType type, TokenAllocatorBase<Unit> allocator, @Nullable Integer numTokens,
                          @Nullable ImmutableList<Weighted<UnitInfo>> sortedUnits, @Nullable ImmutableMap<Unit, Collection<Token>> unitToTokens,
                          @Nullable ImmutableMap<Token, Unit> sortedTokens, @Nullable ImmutableList<Token> tokens, Unit unit,
                          @Nullable TokenInfo<Unit> tokenInfo)
      {
          this.type = type;
          this.allocator = allocator;
          this.replicas = allocator.getReplicas();
          this.numTokens = numTokens;
          this.sortedUnits = sortedUnits;
          this.unitToTokens = unitToTokens;
          this.sortedTokens = sortedTokens;
          this.tokens = tokens;
          this.unit = unit;
          this.tokenInfo = tokenInfo;
      }
  
      enum TokenAllocatorEventType
      {
          REPLICATION_AWARE_TOKEN_ALLOCATOR_INSTANCIATED,
          NO_REPLICATION_AWARE_TOKEN_ALLOCATOR_INSTANCIATED,
          UNIT_ADDED,
          UNIT_REMOVED,
          TOKEN_INFOS_CREATED,
          RANDOM_TOKENS_GENERATED,
          TOKENS_ALLOCATED
      }
  
      public TokenAllocatorEventType getType()
      {
          return type;
      }
  
      public HashMap<String, Serializable> toMap()
      {
          // be extra defensive against nulls and bugs
          HashMap<String, Serializable> ret = new HashMap<>();
          if (allocator != null)
          {
              if (allocator.partitioner != null) ret.put("partitioner", allocator.partitioner.getClass().getSimpleName());
              if (allocator.strategy != null) ret.put("strategy", allocator.strategy.getClass().getSimpleName());
          }
          ret.put("replicas", replicas);
          ret.put("numTokens", this.numTokens);
          ret.put("sortedUnits", String.valueOf(sortedUnits));
          ret.put("sortedTokens", String.valueOf(sortedTokens));
          ret.put("unitToTokens", String.valueOf(unitToTokens));
          ret.put("tokens", String.valueOf(tokens));
          ret.put("unit", String.valueOf(unit));
          ret.put("tokenInfo", String.valueOf(tokenInfo));
          return ret;
      }
  }
  