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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.causeway.testdomain.util.interaction;
  
  import java.util.function.Supplier;
  
  import jakarta.inject.Inject;
  
  import org.junit.jupiter.api.Assertions;
  
  import org.springframework.stereotype.Service;
  import org.springframework.transaction.support.TransactionSynchronization;
  
  import org.apache.causeway.applib.annotation.TransactionScope;
  import org.apache.causeway.core.transaction.events.TransactionCompletionStatus;
  import org.apache.causeway.testdomain.util.kv.KVStoreForTesting;
  
  import lombok.extern.log4j.Log4j2;
  
  @Service
  @TransactionScope
  @Log4j2
  public class InteractionBoundaryProbe implements TransactionSynchronization {
  
      @Inject private KVStoreForTesting kvStoreForTesting;
  
      @Override
      public void beforeCompletion() {
          TransactionSynchronization.super.beforeCompletion();
  
          log.debug("txStarted");
          kvStoreForTesting.incrementCounter(InteractionBoundaryProbe.class, "txEnding");
      }
  
      @Override
      public void afterCompletion(final int status) {
          TransactionCompletionStatus transactionCompletionStatus = TransactionCompletionStatus.forStatus(status);
  
          if(transactionCompletionStatus.isRolledBack()) {
              kvStoreForTesting.incrementCounter(InteractionBoundaryProbe.class, "txRolledBack");
          } else if(transactionCompletionStatus.isCommitted()) {
              kvStoreForTesting.incrementCounter(InteractionBoundaryProbe.class, "txCommitted");
          }
      }
  
      // -- ACCESS TO COUNTERS
  
      public static long totalInteractionsStarted(final KVStoreForTesting kvStoreForTesting) {
          return kvStoreForTesting.getCounter(InteractionBoundaryProbe.class, "iaStarted");
      }
  
      public static long totalInteractionsEnded(final KVStoreForTesting kvStoreForTesting) {
          return kvStoreForTesting.getCounter(InteractionBoundaryProbe.class, "iaEnded");
      }
  
      public static long totalTransactionsEnding(final KVStoreForTesting kvStoreForTesting) {
          return kvStoreForTesting.getCounter(InteractionBoundaryProbe.class, "txEnding");
      }
  
      public static long totalTransactionsCommitted(final KVStoreForTesting kvStoreForTesting) {
          return kvStoreForTesting.getCounter(InteractionBoundaryProbe.class, "txCommitted");
      }
  
      public static long totalTransactionsRolledBack(final KVStoreForTesting kvStoreForTesting) {
          return kvStoreForTesting.getCounter(InteractionBoundaryProbe.class, "txRolledBack");
      }
  
      // -- ASSERTIONS (INTERACTIONAL)
  
      public static void assertInteractional(final KVStoreForTesting kvStoreForTesting, final Runnable runnable) {
          assertInteractional(kvStoreForTesting, ()->{ runnable.run(); return null; });
      }
  
      public static <T> T assertInteractional(final KVStoreForTesting kvStoreForTesting, final Supplier<T> supplier) {
  
          final long iaStartCountBefore = totalInteractionsStarted(kvStoreForTesting);
          final long iaEndCountBefore = totalInteractionsEnded(kvStoreForTesting);
          var result = supplier.get();
          final long iaStartCountAfter = totalInteractionsStarted(kvStoreForTesting);
          final long iaEndCountAfter = totalInteractionsEnded(kvStoreForTesting);
  
          Assertions.assertEquals(1, iaStartCountAfter - iaStartCountBefore);
          Assertions.assertEquals(1, iaEndCountAfter - iaEndCountBefore);
  
          return result;
      }
  
      // -- ASSERTIONS (TRANSACTIONAL)
  
      public static void assertTransactional(final KVStoreForTesting kvStoreForTesting, final Runnable runnable) {
          assertTransactional(kvStoreForTesting, ()->{ runnable.run(); return null; });
      }
  
      public static <T> T assertTransactional(final KVStoreForTesting kvStoreForTesting, final Supplier<T> supplier) {
  
          final long txEndCountBefore = totalTransactionsEnding(kvStoreForTesting);
          var result = supplier.get();
          final long txEndCountAfter = totalTransactionsEnding(kvStoreForTesting);
  
          Assertions.assertEquals(1, txEndCountAfter - txEndCountBefore);
  
          return result;
      }
  
  }
  