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.direct;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.Serializable;
  import java.util.Collections;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Count;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.util.IllegalMutationException;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.joda.time.Instant;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ImmutabilityEnforcementFactory}. */
  @RunWith(JUnit4.class)
  public class ImmutabilityEnforcementFactoryTest implements Serializable {
    @Rule
    public transient TestPipeline p = TestPipeline.create().enableAbandonedNodeEnforcement(false);
  
    @Rule public transient ExpectedException thrown = ExpectedException.none();
    private transient ImmutabilityEnforcementFactory factory;
    private transient BundleFactory bundleFactory;
    private transient PCollection<byte[]> pcollection;
    private transient AppliedPTransform<?, ?, ?> consumer;
  
    @Before
    public void setup() {
      factory = new ImmutabilityEnforcementFactory();
      bundleFactory = ImmutableListBundleFactory.create();
      pcollection =
          p.apply(Create.of("foo".getBytes(UTF_8), "spamhameggs".getBytes(UTF_8)))
              .apply(
                  ParDo.of(
                      new DoFn<byte[], byte[]>() {
                        @ProcessElement
                        public void processElement(ProcessContext c) throws Exception {
                          c.element()[0] = 'b';
                        }
                      }));
      PCollection<Long> consumer = pcollection.apply(Count.globally());
      DirectGraphs.performDirectOverrides(p);
      this.consumer = DirectGraphs.getProducer(consumer);
    }
  
    @Test
    public void unchangedSucceeds() {
      WindowedValue<byte[]> element = WindowedValues.valueInGlobalWindow("bar".getBytes(UTF_8));
      CommittedBundle<byte[]> elements =
          bundleFactory.createBundle(pcollection).add(element).commit(Instant.now());
  
      ModelEnforcement<byte[]> enforcement = factory.forBundle(elements, consumer);
      enforcement.beforeElement(element);
      enforcement.afterElement(element);
      enforcement.afterFinish(
          elements,
          StepTransformResult.<byte[]>withoutHold(consumer).build(),
          Collections.emptyList());
    }
  
    @Test
    public void mutatedDuringProcessElementThrows() {
      WindowedValue<byte[]> element = WindowedValues.valueInGlobalWindow("bar".getBytes(UTF_8));
      CommittedBundle<byte[]> elements =
          bundleFactory.createBundle(pcollection).add(element).commit(Instant.now());
  
      ModelEnforcement<byte[]> enforcement = factory.forBundle(elements, consumer);
      enforcement.beforeElement(element);
      element.getValue()[0] = 'f';
      thrown.expect(IllegalMutationException.class);
      thrown.expectMessage(consumer.getFullName());
      thrown.expectMessage("illegaly mutated");
      thrown.expectMessage("Input values must not be mutated");
      enforcement.afterElement(element);
      enforcement.afterFinish(
          elements,
          StepTransformResult.<byte[]>withoutHold(consumer).build(),
          Collections.emptyList());
    }
  
    @Test
    public void mutatedAfterProcessElementFails() {
  
      WindowedValue<byte[]> element = WindowedValues.valueInGlobalWindow("bar".getBytes(UTF_8));
      CommittedBundle<byte[]> elements =
          bundleFactory.createBundle(pcollection).add(element).commit(Instant.now());
  
      ModelEnforcement<byte[]> enforcement = factory.forBundle(elements, consumer);
      enforcement.beforeElement(element);
      enforcement.afterElement(element);
  
      element.getValue()[0] = 'f';
      thrown.expect(IllegalMutationException.class);
      thrown.expectMessage(consumer.getFullName());
      thrown.expectMessage("illegaly mutated");
      thrown.expectMessage("Input values must not be mutated");
      enforcement.afterFinish(
          elements,
          StepTransformResult.<byte[]>withoutHold(consumer).build(),
          Collections.emptyList());
    }
  }
  