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.bookkeeper.bookie;
  
  import io.netty.util.Recycler;
  import io.netty.util.Recycler.Handle;
  import java.util.function.Function;
  import lombok.Getter;
  import org.apache.bookkeeper.common.collections.RecyclableArrayList;
  import org.apache.bookkeeper.common.util.Recyclable;
  import org.apache.bookkeeper.common.util.Watcher;
  
  /**
   * A signal object is used for notifying the observers when the {@code LastAddConfirmed} is advanced.
   *
   * <p>The signal object contains the latest {@code LastAddConfirmed} and when the {@code LastAddConfirmed} is advanced.
   */
  @Getter
  public class LastAddConfirmedUpdateNotification implements Recyclable {
  
      public static final Function<Long, LastAddConfirmedUpdateNotification> FUNC = lac -> of(lac);
  
      public static final RecyclableArrayList.Recycler<Watcher<LastAddConfirmedUpdateNotification>> WATCHER_RECYCLER =
          new RecyclableArrayList.Recycler<>();
  
      public static LastAddConfirmedUpdateNotification of(long lastAddConfirmed) {
          LastAddConfirmedUpdateNotification lac = RECYCLER.get();
          lac.lastAddConfirmed = lastAddConfirmed;
          lac.timestamp = System.currentTimeMillis();
          return lac;
      }
  
      private static final Recycler<LastAddConfirmedUpdateNotification> RECYCLER =
          new Recycler<LastAddConfirmedUpdateNotification>() {
              @Override
              protected LastAddConfirmedUpdateNotification newObject(Handle<LastAddConfirmedUpdateNotification> handle) {
                  return new LastAddConfirmedUpdateNotification(handle);
              }
          };
  
      private final Handle<LastAddConfirmedUpdateNotification> handle;
      private long lastAddConfirmed;
      private long timestamp;
  
      public LastAddConfirmedUpdateNotification(Handle<LastAddConfirmedUpdateNotification> handle) {
          this.handle = handle;
      }
  
      @Override
      public void recycle() {
          this.lastAddConfirmed = -1L;
          this.timestamp = -1L;
          handle.recycle(this);
      }
  }
  