Remove Pipeline as a field in pipeline classes (#1119)

In tests we use a TestPipelineExtension which does some static
initialization that should not be repeated the same JVM. In our
XXXPipeline classes we save the pipeline as a field and usually write lambdas
that are pass to the pipeline. Because lambdas are effectively anonymous inner
classes they are bound to their enclosing instances. When they get serialized
during pipeline execution, their enclosing classes also do. This might result
in undefined behavior when multiple lambdas in the same XXXPipeline are used
on the same JVM (such as in tests) where the static initialization may be done
multiple times if different class loaders are used. This is very
unlikely to happen but as a best practice we still remove them as
fields.

core/src/main/java/google/registry/beam/datastore/BulkDeleteDatastorePipeline.java

@@ -87,20 +87,18 @@ public class BulkDeleteDatastorePipeline {
 
   private final BulkDeletePipelineOptions options;
 
-  private final Pipeline pipeline;
-
   BulkDeleteDatastorePipeline(BulkDeletePipelineOptions options) {
     this.options = options;
-    pipeline = Pipeline.create(options);
   }
 
   public void run() {
-    setupPipeline();
+    Pipeline pipeline = Pipeline.create(options);
+    setupPipeline(pipeline);
     pipeline.run();
   }
 
   @SuppressWarnings("deprecation") // org.apache.beam.sdk.transforms.Reshuffle
-  private void setupPipeline() {
+  private void setupPipeline(Pipeline pipeline) {
     checkState(
         !FORBIDDEN_PROJECTS.contains(options.getProject()),
         "Bulk delete is forbidden in %s",

core/src/main/java/google/registry/beam/initsql/InitSqlPipeline.java

@@ -120,26 +120,22 @@ public class InitSqlPipeline implements Serializable {
 
   private final InitSqlPipelineOptions options;
 
-  private final Pipeline pipeline;
-
   InitSqlPipeline(InitSqlPipelineOptions options) {
     this.options = options;
-    pipeline = Pipeline.create(options);
+  }
+
+  PipelineResult run() {
+    return run(Pipeline.create(options));
   }
 
   @VisibleForTesting
-  InitSqlPipeline(InitSqlPipelineOptions options, Pipeline pipeline) {
-    this.options = options;
-    this.pipeline = pipeline;
-  }
-
-  public PipelineResult run() {
-    setupPipeline();
+  PipelineResult run(Pipeline pipeline) {
+    setupPipeline(pipeline);
     return pipeline.run();
   }
 
   @VisibleForTesting
-  void setupPipeline() {
+  void setupPipeline(Pipeline pipeline) {
     options.setIsolationOverride(TransactionIsolationLevel.TRANSACTION_READ_UNCOMMITTED);
     PCollectionTuple datastoreSnapshot =
         pipeline.apply(

core/src/main/java/google/registry/beam/invoicing/InvoicingPipeline.java

@@ -17,7 +17,6 @@ package google.registry.beam.invoicing;
 import static google.registry.beam.BeamUtils.getQueryFromFile;
 import static org.apache.beam.sdk.values.TypeDescriptors.strings;
 
-import com.google.common.annotations.VisibleForTesting;
 import google.registry.beam.invoicing.BillingEvent.InvoiceGroupingKey;
 import google.registry.beam.invoicing.BillingEvent.InvoiceGroupingKey.InvoiceGroupingKeyCoder;
 import google.registry.reporting.billing.BillingModule;
@@ -60,24 +59,18 @@ public class InvoicingPipeline implements Serializable {
       DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSSSSS");
 
   private final InvoicingPipelineOptions options;
-  private final Pipeline pipeline;
-
-  @VisibleForTesting
-  InvoicingPipeline(InvoicingPipelineOptions options, Pipeline pipeline) {
-    this.options = options;
-    this.pipeline = pipeline;
-  }
 
   InvoicingPipeline(InvoicingPipelineOptions options) {
-    this(options, Pipeline.create(options));
+    this.options = options;
   }
 
   PipelineResult run() {
-    setupPipeline();
+    Pipeline pipeline = Pipeline.create(options);
+    setupPipeline(pipeline);
     return pipeline.run();
   }
 
-  void setupPipeline() {
+  void setupPipeline(Pipeline pipeline) {
     PCollection<BillingEvent> billingEvents =
         pipeline.apply(
             "Read BillingEvents from Bigquery",

core/src/main/java/google/registry/beam/spec11/Spec11Pipeline.java

@@ -18,7 +18,6 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static google.registry.beam.BeamUtils.getQueryFromFile;
 
 import com.google.auto.value.AutoValue;
-import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.ImmutableSet;
 import dagger.Component;
 import dagger.Module;
@@ -84,26 +83,19 @@ public class Spec11Pipeline implements Serializable {
 
   private final Spec11PipelineOptions options;
   private final EvaluateSafeBrowsingFn safeBrowsingFn;
-  private final Pipeline pipeline;
-
-  @VisibleForTesting
-  Spec11Pipeline(
-      Spec11PipelineOptions options, EvaluateSafeBrowsingFn safeBrowsingFn, Pipeline pipeline) {
-    this.options = options;
-    this.safeBrowsingFn = safeBrowsingFn;
-    this.pipeline = pipeline;
-  }
 
   Spec11Pipeline(Spec11PipelineOptions options, EvaluateSafeBrowsingFn safeBrowsingFn) {
-    this(options, safeBrowsingFn, Pipeline.create(options));
+    this.options = options;
+    this.safeBrowsingFn = safeBrowsingFn;
   }
 
   PipelineResult run() {
-    setupPipeline();
+    Pipeline pipeline = Pipeline.create(options);
+    setupPipeline(pipeline);
     return pipeline.run();
   }
 
-  void setupPipeline() {
+  void setupPipeline(Pipeline pipeline) {
     PCollection<Subdomain> domains =
         pipeline.apply(
             "Read active domains from BigQuery",

core/src/test/java/google/registry/beam/initsql/InitSqlPipelineGraphTest.java

@@ -52,7 +52,7 @@ class InitSqlPipelineGraphTest {
 
   @Test
   void createPipeline_compareGraph() throws IOException {
-    new InitSqlPipeline(options, testPipeline).setupPipeline();
+    new InitSqlPipeline(options).setupPipeline(testPipeline);
     String dotString = PipelineDotRenderer.toDotString(testPipeline);
     URL goldenDotUrl = Resources.getResource(InitSqlPipelineGraphTest.class, GOLDEN_DOT_FILE);
     File outputFile = new File(new File(goldenDotUrl.getFile()).getParent(), "pipeline_curr.dot");

core/src/test/java/google/registry/beam/initsql/InitSqlPipelineTest.java

@@ -317,8 +317,8 @@ class InitSqlPipelineTest {
                 "--commitLogDir=" + commitLogDir.getAbsolutePath())
             .withValidation()
             .as(InitSqlPipelineOptions.class);
-    InitSqlPipeline initSqlPipeline = new InitSqlPipeline(options, testPipeline);
-    initSqlPipeline.run().waitUntilFinish();
+    InitSqlPipeline initSqlPipeline = new InitSqlPipeline(options);
+    initSqlPipeline.run(testPipeline).waitUntilFinish();
     try (AppEngineEnvironment env = new AppEngineEnvironment("test")) {
       assertHostResourceEquals(
           jpaTm().transact(() -> jpaTm().loadByKey(hostResource.createVKey())), hostResource);