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.beam.runners.core.triggers;
  
  import java.util.List;
  import java.util.Objects;
  import org.apache.beam.sdk.state.TimeDomain;
  import org.apache.beam.sdk.transforms.SerializableFunction;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  
  /**
   * {@code AfterProcessingTime} triggers fire based on the current processing time. They operate in
   * the real-time domain.
   *
   * <p>The time at which to fire the timer can be adjusted via the methods in {@link
   * AfterDelayFromFirstElementStateMachine}, such as {@link
   * AfterDelayFromFirstElementStateMachine#plusDelayOf} or {@link
   * AfterDelayFromFirstElementStateMachine#alignedTo}.
   */
  // The superclass should be inlined here, its only real use
  // https://issues.apache.org/jira/browse/BEAM-1486
  public class AfterProcessingTimeStateMachine extends AfterDelayFromFirstElementStateMachine {
  
    @Override
    public @Nullable Instant getCurrentTime(TriggerStateMachine.TriggerContext context) {
      return context.currentProcessingTime();
    }
  
    private AfterProcessingTimeStateMachine(List<SerializableFunction<Instant, Instant>> transforms) {
      super(TimeDomain.PROCESSING_TIME, transforms);
    }
  
    /**
     * Creates a trigger that fires when the current processing time passes the processing time at
     * which this trigger saw the first element in a pane.
     */
    public static AfterProcessingTimeStateMachine pastFirstElementInPane() {
      return new AfterProcessingTimeStateMachine(IDENTITY);
    }
  
    @Override
    protected AfterProcessingTimeStateMachine newWith(
        List<SerializableFunction<Instant, Instant>> transforms) {
      return new AfterProcessingTimeStateMachine(transforms);
    }
  
    @Override
    public String toString() {
      StringBuilder builder = new StringBuilder("AfterProcessingTime.pastFirstElementInPane()");
      for (SerializableFunction<Instant, Instant> delayFn : timestampMappers) {
        builder.append(".plusDelayOf(").append(delayFn).append(")");
      }
  
      return builder.toString();
    }
  
    @Override
    public boolean equals(@Nullable Object obj) {
      if (this == obj) {
        return true;
      }
      if (!(obj instanceof AfterProcessingTimeStateMachine)) {
        return false;
      }
      AfterProcessingTimeStateMachine that = (AfterProcessingTimeStateMachine) obj;
      return Objects.equals(this.timestampMappers, that.timestampMappers);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(getClass(), this.timestampMappers);
    }
  }
  