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.bifromq.inbox.store.delay;
  
  import org.apache.bifromq.inbox.record.TenantInboxInstance;
  import java.time.Duration;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ThreadLocalRandom;
  import lombok.extern.slf4j.Slf4j;
  
  @Slf4j
  public abstract class RetryableDelayedTask<R> implements IDelayedTask<TenantInboxInstance> {
      protected final Duration delay;
      protected final int retryCount;
      protected final long mod;
  
      protected RetryableDelayedTask(Duration delay, long mod, int retryCount) {
          this.delay = delay;
          this.mod = mod;
          this.retryCount = retryCount;
      }
  
      @Override
      public final CompletableFuture<Void> run(TenantInboxInstance key, IDelayTaskRunner<TenantInboxInstance> runner) {
          if (retryCount > 5) {
              log.debug("{} failed after {} retries, tenantId={}, inboxId={}, inc={}", getTaskName(), retryCount,
                  key.tenantId(), key.instance().inboxId(), key.instance().incarnation());
              return CompletableFuture.completedFuture(null);
          }
          return callOperation(key, runner).thenAccept(response -> {
              if (shouldRetry(response)) {
                  Duration retryDelay = Duration.ofMillis(ThreadLocalRandom.current().nextLong(100, 5000));
                  runner.schedule(key, createRetryTask(retryDelay));
              }
          });
      }
  
      protected abstract CompletableFuture<R> callOperation(TenantInboxInstance key,
                                                            IDelayTaskRunner<TenantInboxInstance> runner);
  
      protected abstract boolean shouldRetry(R reply);
  
      protected abstract RetryableDelayedTask<R> createRetryTask(Duration newDelay);
  
      protected abstract String getTaskName();
  
      @Override
      public final Duration getDelay() {
          return delay;
      }
  }
  