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.sdk.fn.data;
  
  import com.google.auto.value.AutoValue;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * A logical endpoint is a pair of an instruction ID corresponding to the {@link
   * BeamFnApi.ProcessBundleRequest} and the transform within the processing graph. This enables the
   * same Data Service or Data Client to be re-used across multiple bundles.
   */
  @AutoValue
  public abstract class LogicalEndpoint {
  
    public abstract String getInstructionId();
  
    public abstract String getTransformId();
  
    public abstract @Nullable String getTimerFamilyId();
  
    public boolean isTimer() {
      return getTimerFamilyId() != null;
    }
  
    public static LogicalEndpoint data(String instructionId, String transformId) {
      return new AutoValue_LogicalEndpoint(instructionId, transformId, null);
    }
  
    public static LogicalEndpoint timer(
        String instructionId, String transformId, String timerFamilyId) {
      if (timerFamilyId == null) {
        throw new NullPointerException("timerFamilyId");
      }
      return new AutoValue_LogicalEndpoint(instructionId, transformId, timerFamilyId);
    }
  }
  