content: /*
   * Copyright 2021-2024 Aklivity Inc.
   *
   * Aklivity 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 io.aklivity.zilla.runtime.binding.kafka.internal.budget;
  
  import java.util.function.LongSupplier;
  
  import org.agrona.collections.Long2ObjectHashMap;
  
  import io.aklivity.zilla.runtime.engine.budget.BudgetCreditor;
  
  public final class KafkaMergedBudgetCreditor implements MergedBudgetCreditor
  {
      private final Long2ObjectHashMap<KafkaMergedBudget> budgetsByMergedId;
      private final LongSupplier supplyBudgetId;
      private final BudgetCreditor creditor;
  
      KafkaMergedBudgetCreditor(
          Long2ObjectHashMap<KafkaMergedBudget> budgetsByMergedId,
          LongSupplier supplyBudgetId,
          BudgetCreditor creditor)
      {
          this.budgetsByMergedId = budgetsByMergedId;
          this.supplyBudgetId = supplyBudgetId;
          this.creditor = creditor;
      }
  
      @Override
      public long acquire(
          long budgetId)
      {
          return acquire(0L, budgetId);
      }
  
      @Override
      public long acquire(
          long watcherId,
          long budgetId)
      {
          assert watcherId != 0L;
          final long mergedBudgetId = budgetId != NO_BUDGET_ID ? supplyChild(budgetId) : supplyBudgetId.getAsLong();
          budgetsByMergedId.put(mergedBudgetId, new KafkaMergedBudget(budgetId, watcherId));
          return mergedBudgetId;
      }
  
      @Override
      public long credit(
          long traceId,
          long mergedBudgetId,
          long credit)
      {
          final KafkaMergedBudget mergedBudget = budgetsByMergedId.get(mergedBudgetId);
          assert mergedBudget != null;
  
          return mergedBudget.credit(traceId, credit);
      }
  
      @Override
      public void release(
          long mergedBudgetId)
      {
          final KafkaMergedBudget mergedBudget = budgetsByMergedId.remove(mergedBudgetId);
          assert mergedBudget != null;
          final long budgetId = mergedBudget.budgetId();
          if (budgetId != NO_BUDGET_ID)
          {
              creditor.cleanupChild(mergedBudgetId);
          }
          mergedBudget.release();
      }
  
      @Override
      public long supplyChild(
          long budgetId)
      {
          return creditor.supplyChild(budgetId);
      }
  
      @Override
      public void cleanupChild(
          long budgetId)
      {
          creditor.cleanupChild(budgetId);
      }
  }
  