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 org.apache.beam.sdk.transforms.Reshuffle;
  
  /**
   * The trigger used with {@link Reshuffle} which triggers on every element and never buffers state.
   */
  public class ReshuffleTriggerStateMachine extends TriggerStateMachine {
  
    public static ReshuffleTriggerStateMachine create() {
      return new ReshuffleTriggerStateMachine();
    }
  
    private ReshuffleTriggerStateMachine() {
      super(null);
    }
  
    @Override
    public void prefetchOnElement(PrefetchContext c) {}
  
    @Override
    public void onElement(TriggerStateMachine.OnElementContext c) {}
  
    @Override
    public void prefetchOnMerge(MergingPrefetchContext c) {}
  
    @Override
    public void onMerge(TriggerStateMachine.OnMergeContext c) {}
  
    @Override
    public void prefetchShouldFire(PrefetchContext c) {}
  
    @Override
    public boolean shouldFire(TriggerStateMachine.TriggerContext context) throws Exception {
      return true;
    }
  
    @Override
    public void onFire(TriggerStateMachine.TriggerContext context) throws Exception {}
  
    @Override
    public String toString() {
      return "ReshuffleTriggerStateMachine()";
    }
  }
  