/*
 * 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.jet;

import java.util.Collections;
import javax.annotation.Nullable;
import org.apache.beam.sdk.PipelineResult;
import org.apache.beam.sdk.metrics.DistributionResult;
import org.apache.beam.sdk.metrics.GaugeResult;
import org.apache.beam.sdk.metrics.MetricQueryResults;
import org.apache.beam.sdk.metrics.MetricResult;
import org.apache.beam.sdk.metrics.MetricResults;
import org.apache.beam.sdk.metrics.MetricsFilter;
import org.joda.time.Duration;

/**
 * Alternative implementation of {@link PipelineResult} used to avoid throwing Exceptions in certain
 * situations.
 */
public class FailedRunningPipelineResults implements PipelineResult {

  private final RuntimeException cause;

  public FailedRunningPipelineResults(RuntimeException cause) {
    this.cause = cause;
  }

  public RuntimeException getCause() {
    return cause;
  }

  @Override
  public State getState() {
    return State.DONE;
  }

  @Override
  public State cancel() {
    return State.DONE;
  }

  @Override
  public State waitUntilFinish(Duration duration) {
    return State.DONE;
  }

  @Override
  public State waitUntilFinish() {
    return State.DONE;
  }

  @Override
  public MetricResults metrics() {
    return new MetricResults() {
      @Override
      public MetricQueryResults queryMetrics(@Nullable MetricsFilter filter) {
        return new MetricQueryResults() {
          @Override
          public Iterable<MetricResult<Long>> getCounters() {
            return Collections.emptyList();
          }

          @Override
          public Iterable<MetricResult<DistributionResult>> getDistributions() {
            return Collections.emptyList();
          }

          @Override
          public Iterable<MetricResult<GaugeResult>> getGauges() {
            return Collections.emptyList();
          }
        };
      }
    };
  }
}