{"action":"created","comment":{"url":"https://api.github.com/repos/apache/beam/pulls/comments/167730350","pull_request_review_id":95992007,"id":167730350,"diff_hunk":"@@ -0,0 +1,125 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one\n+ * or more contributor license agreements.  See the NOTICE file\n+ * distributed with this work for additional information\n+ * regarding copyright ownership.  The ASF licenses this file\n+ * to you under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance\n+ * with the License.  You may obtain a copy of the License at\n+ *\n+ *     http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.beam.fn.harness;\n+\n+import static com.google.common.collect.Iterables.getOnlyElement;\n+import static org.apache.beam.runners.core.construction.UrnUtils.validateCommonUrn;\n+\n+import com.google.auto.service.AutoService;\n+import com.google.common.collect.ImmutableMap;\n+import com.google.common.collect.Iterables;\n+import com.google.common.collect.Multimap;\n+import java.io.IOException;\n+import java.util.Collection;\n+import java.util.Map;\n+import java.util.function.Consumer;\n+import java.util.function.Supplier;\n+import org.apache.beam.fn.harness.data.BeamFnDataClient;\n+import org.apache.beam.fn.harness.data.MultiplexingFnDataReceiver;\n+import org.apache.beam.fn.harness.fn.ThrowingRunnable;\n+import org.apache.beam.fn.harness.state.BeamFnStateClient;\n+import org.apache.beam.model.pipeline.v1.RunnerApi;\n+import org.apache.beam.model.pipeline.v1.RunnerApi.PCollection;\n+import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform;\n+import org.apache.beam.model.pipeline.v1.RunnerApi.SdkFunctionSpec;\n+import org.apache.beam.runners.core.construction.PCollectionViewTranslation;\n+import org.apache.beam.sdk.fn.data.FnDataReceiver;\n+import org.apache.beam.sdk.options.PipelineOptions;\n+import org.apache.beam.sdk.transforms.windowing.BoundedWindow;\n+import org.apache.beam.sdk.transforms.windowing.WindowMappingFn;\n+import org.apache.beam.sdk.util.WindowedValue;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+/**\n+ * Maps windows using a window mapping fn.\n+ */\n+public class WindowMappingFnRunner<InputT extends BoundedWindow, OutputT extends BoundedWindow> {\n+  private static final Logger LOG = LoggerFactory.getLogger(BeamFnDataReadRunner.class);\n+  static final String URN = validateCommonUrn(\"beam:transform:map_windows:v1\");\n+\n+  /**\n+   * A registrar which provides a factory to handle mapping main input windows onto side input\n+   * windows.\n+   */\n+  @AutoService(PTransformRunnerFactory.Registrar.class)\n+  public static class Registrar implements PTransformRunnerFactory.Registrar {\n+\n+    @Override\n+    public Map<String, PTransformRunnerFactory> getPTransformRunnerFactories() {\n+      return ImmutableMap.of(URN, new Factory());\n+    }\n+  }\n+\n+  /** A factory for {@link BeamFnDataReadRunner}s. */\n+  static class Factory<InputT extends BoundedWindow, OutputT extends BoundedWindow>\n+      implements PTransformRunnerFactory<WindowMappingFnRunner<InputT, OutputT>> {\n+\n+    @Override\n+    public WindowMappingFnRunner<InputT, OutputT> createRunnerForPTransform(\n+        PipelineOptions pipelineOptions,\n+        BeamFnDataClient beamFnDataClient,\n+        BeamFnStateClient beamFnStateClient,\n+        String pTransformId,\n+        PTransform pTransform,\n+        Supplier<String> processBundleInstructionId,\n+        Map<String, PCollection> pCollections,\n+        Map<String, RunnerApi.Coder> coders,\n+        Map<String, RunnerApi.WindowingStrategy> windowingStrategies,\n+        Multimap<String, FnDataReceiver<WindowedValue<?>>> pCollectionIdsToConsumers,\n+        Consumer<ThrowingRunnable> addStartFunction,\n+        Consumer<ThrowingRunnable> addFinishFunction) throws IOException {\n+\n+      Collection<FnDataReceiver<WindowedValue<OutputT>>> consumers =\n+          (Collection) pCollectionIdsToConsumers.get(\n+              getOnlyElement(pTransform.getOutputsMap().values()));\n+\n+      SdkFunctionSpec windowMappingFnPayload =\n+          SdkFunctionSpec.parseFrom(pTransform.getSpec().getPayload());\n+      WindowMappingFn<OutputT> windowMappingFn =\n+          (WindowMappingFn<OutputT>) PCollectionViewTranslation.windowMappingFnFromProto(\n+              windowMappingFnPayload);\n+\n+      WindowMappingFnRunner<InputT, OutputT> runner =\n+          new WindowMappingFnRunner<>(\n+              windowMappingFn,\n+              MultiplexingFnDataReceiver.forConsumers(consumers));\n+      pCollectionIdsToConsumers.put(\n+          Iterables.getOnlyElement(pTransform.getInputsMap().values()),\n+          (FnDataReceiver) (FnDataReceiver<WindowedValue<InputT>>) runner::mapWindow);\n+      return runner;\n+    }\n+  }\n+\n+  private final WindowMappingFn<OutputT> windowMappingFn;\n+  private final FnDataReceiver<WindowedValue<OutputT>> consumer;\n+\n+  public WindowMappingFnRunner(\n+      WindowMappingFn<OutputT> windowMappingFn,\n+      FnDataReceiver<WindowedValue<OutputT>> consumer) {\n+    this.windowMappingFn = windowMappingFn;\n+    this.consumer = consumer;\n+  }\n+\n+  public void mapWindow(WindowedValue<InputT> element) throws Exception {\n+    WindowedValue<OutputT> output =\n+        element.withValue(windowMappingFn.getSideInputWindow(element.getValue()));","path":"sdks/java/harness/src/main/java/org/apache/beam/fn/harness/WindowMappingFnRunner.java","position":122,"original_position":122,"commit_id":"a4ae08b2ca6db67bd742486a08e691dd5c2bdea8","original_commit_id":"a4ae08b2ca6db67bd742486a08e691dd5c2bdea8","user":{"login":"robertwb","id":486017,"avatar_url":"https://avatars3.githubusercontent.com/u/486017?v=4","gravatar_id":"","url":"https://api.github.com/users/robertwb","html_url":"https://github.com/robertwb","followers_url":"https://api.github.com/users/robertwb/followers","following_url":"https://api.github.com/users/robertwb/following{/other_user}","gists_url":"https://api.github.com/users/robertwb/gists{/gist_id}","starred_url":"https://api.github.com/users/robertwb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/robertwb/subscriptions","organizations_url":"https://api.github.com/users/robertwb/orgs","repos_url":"https://api.github.com/users/robertwb/repos","events_url":"https://api.github.com/users/robertwb/events{/privacy}","received_events_url":"https://api.github.com/users/robertwb/received_events","type":"User","site_admin":false},"body":"We do \"withValue\" just because we must accept/return windowed values, right? The fact that InputT and OutputT are windows themselves, seems a bit obscured here. ","created_at":"2018-02-13T00:33:09Z","updated_at":"2018-02-13T00:34:38Z","html_url":"https://github.com/apache/beam/pull/4655#discussion_r167730350","pull_request_url":"https://api.github.com/repos/apache/beam/pulls/4655","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/beam/pulls/comments/167730350"},"html":{"href":"https://github.com/apache/beam/pull/4655#discussion_r167730350"},"pull_request":{"href":"https://api.github.com/repos/apache/beam/pulls/4655"}}},"pull_request":{"url":"https://api.github.com/repos/apache/beam/pulls/4655","id":168430076,"html_url":"https://github.com/apache/beam/pull/4655","diff_url":"https://github.com/apache/beam/pull/4655.diff","patch_url":"https://github.com/apache/beam/pull/4655.patch","issue_url":"https://api.github.com/repos/apache/beam/issues/4655","number":4655,"state":"open","locked":false,"title":"[BEAM-3626] Add a handler capable of executing a window mapping fn on a stream of windows.","user":{"login":"lukecwik","id":10078956,"avatar_url":"https://avatars3.githubusercontent.com/u/10078956?v=4","gravatar_id":"","url":"https://api.github.com/users/lukecwik","html_url":"https://github.com/lukecwik","followers_url":"https://api.github.com/users/lukecwik/followers","following_url":"https://api.github.com/users/lukecwik/following{/other_user}","gists_url":"https://api.github.com/users/lukecwik/gists{/gist_id}","starred_url":"https://api.github.com/users/lukecwik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lukecwik/subscriptions","organizations_url":"https://api.github.com/users/lukecwik/orgs","repos_url":"https://api.github.com/users/lukecwik/repos","events_url":"https://api.github.com/users/lukecwik/events{/privacy}","received_events_url":"https://api.github.com/users/lukecwik/received_events","type":"User","site_admin":false},"body":"The primary use case for this is mapping main input windows onto side input windows when filtering input elements before they are sent to a ParDo containing a side input.\r\n\r\n------------------------\r\n\r\nFollow this checklist to help us incorporate your contribution quickly and easily:\r\n\r\n - [x] Make sure there is a [JIRA issue](https://issues.apache.org/jira/projects/BEAM/issues/) filed for the change (usually before you start working on it).  Trivial changes like typos do not require a JIRA issue.  Your pull request should address just this issue, without pulling in other changes.\r\n - [x] Format the pull request title like `[BEAM-XXX] Fixes bug in ApproximateQuantiles`, where you replace `BEAM-XXX` with the appropriate JIRA issue.\r\n - [x] Write a pull request description that is detailed enough to understand:\r\n   - [x] What the pull request does\r\n   - [x] Why it does it\r\n   - [ ] How it does it\r\n   - [ ] Why this approach\r\n - [x] Each commit in the pull request should have a meaningful subject line and body.\r\n - [x] Run `mvn clean verify` to make sure basic checks pass. A more thorough check will be performed on your pull request automatically.\r\n - [ ] If this contribution is large, please file an Apache [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).\r\n\r\n","created_at":"2018-02-11T01:12:14Z","updated_at":"2018-02-13T00:34:38Z","closed_at":null,"merged_at":null,"merge_commit_sha":"98478c6549cbdede323dbd3e3f816f4061a8869d","assignee":{"login":"tgroh","id":429866,"avatar_url":"https://avatars2.githubusercontent.com/u/429866?v=4","gravatar_id":"","url":"https://api.github.com/users/tgroh","html_url":"https://github.com/tgroh","followers_url":"https://api.github.com/users/tgroh/followers","following_url":"https://api.github.com/users/tgroh/following{/other_user}","gists_url":"https://api.github.com/users/tgroh/gists{/gist_id}","starred_url":"https://api.github.com/users/tgroh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tgroh/subscriptions","organizations_url":"https://api.github.com/users/tgroh/orgs","repos_url":"https://api.github.com/users/tgroh/repos","events_url":"https://api.github.com/users/tgroh/events{/privacy}","received_events_url":"https://api.github.com/users/tgroh/received_events","type":"User","site_admin":false},"assignees":[{"login":"tgroh","id":429866,"avatar_url":"https://avatars2.githubusercontent.com/u/429866?v=4","gravatar_id":"","url":"https://api.github.com/users/tgroh","html_url":"https://github.com/tgroh","followers_url":"https://api.github.com/users/tgroh/followers","following_url":"https://api.github.com/users/tgroh/following{/other_user}","gists_url":"https://api.github.com/users/tgroh/gists{/gist_id}","starred_url":"https://api.github.com/users/tgroh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tgroh/subscriptions","organizations_url":"https://api.github.com/users/tgroh/orgs","repos_url":"https://api.github.com/users/tgroh/repos","events_url":"https://api.github.com/users/tgroh/events{/privacy}","received_events_url":"https://api.github.com/users/tgroh/received_events","type":"User","site_admin":false},{"login":"robertwb","id":486017,"avatar_url":"https://avatars3.githubusercontent.com/u/486017?v=4","gravatar_id":"","url":"https://api.github.com/users/robertwb","html_url":"https://github.com/robertwb","followers_url":"https://api.github.com/users/robertwb/followers","following_url":"https://api.github.com/users/robertwb/following{/other_user}","gists_url":"https://api.github.com/users/robertwb/gists{/gist_id}","starred_url":"https://api.github.com/users/robertwb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/robertwb/subscriptions","organizations_url":"https://api.github.com/users/robertwb/orgs","repos_url":"https://api.github.com/users/robertwb/repos","events_url":"https://api.github.com/users/robertwb/events{/privacy}","received_events_url":"https://api.github.com/users/robertwb/received_events","type":"User","site_admin":false}],"requested_reviewers":[{"login":"tgroh","id":429866,"avatar_url":"https://avatars2.githubusercontent.com/u/429866?v=4","gravatar_id":"","url":"https://api.github.com/users/tgroh","html_url":"https://github.com/tgroh","followers_url":"https://api.github.com/users/tgroh/followers","following_url":"https://api.github.com/users/tgroh/following{/other_user}","gists_url":"https://api.github.com/users/tgroh/gists{/gist_id}","starred_url":"https://api.github.com/users/tgroh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tgroh/subscriptions","organizations_url":"https://api.github.com/users/tgroh/orgs","repos_url":"https://api.github.com/users/tgroh/repos","events_url":"https://api.github.com/users/tgroh/events{/privacy}","received_events_url":"https://api.github.com/users/tgroh/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/beam/pulls/4655/commits","review_comments_url":"https://api.github.com/repos/apache/beam/pulls/4655/comments","review_comment_url":"https://api.github.com/repos/apache/beam/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/beam/issues/4655/comments","statuses_url":"https://api.github.com/repos/apache/beam/statuses/a4ae08b2ca6db67bd742486a08e691dd5c2bdea8","head":{"label":"lukecwik:fn_api2","ref":"fn_api2","sha":"a4ae08b2ca6db67bd742486a08e691dd5c2bdea8","user":{"login":"lukecwik","id":10078956,"avatar_url":"https://avatars3.githubusercontent.com/u/10078956?v=4","gravatar_id":"","url":"https://api.github.com/users/lukecwik","html_url":"https://github.com/lukecwik","followers_url":"https://api.github.com/users/lukecwik/followers","following_url":"https://api.github.com/users/lukecwik/following{/other_user}","gists_url":"https://api.github.com/users/lukecwik/gists{/gist_id}","starred_url":"https://api.github.com/users/lukecwik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lukecwik/subscriptions","organizations_url":"https://api.github.com/users/lukecwik/orgs","repos_url":"https://api.github.com/users/lukecwik/repos","events_url":"https://api.github.com/users/lukecwik/e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