jaketf commented on a change in pull request #11151: [BEAM-9468] Hl7v2 io URL: https://github.com/apache/beam/pull/11151#discussion_r395946114
########## File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/healthcare/HL7v2IO.java ########## @@ -0,0 +1,620 @@ +/* + * 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.io.gcp.healthcare; + +import com.google.api.services.healthcare.v1alpha2.model.IngestMessageResponse; +import com.google.api.services.healthcare.v1alpha2.model.Message; +import com.google.auto.value.AutoValue; +import java.io.IOException; +import java.text.ParseException; +import java.util.Collections; +import java.util.List; +import org.apache.beam.sdk.io.gcp.datastore.AdaptiveThrottler; +import org.apache.beam.sdk.io.gcp.pubsub.PubsubIO; +import org.apache.beam.sdk.metrics.Counter; +import org.apache.beam.sdk.metrics.Metrics; +import org.apache.beam.sdk.transforms.Create; +import org.apache.beam.sdk.transforms.DoFn; +import org.apache.beam.sdk.transforms.PTransform; +import org.apache.beam.sdk.transforms.ParDo; +import org.apache.beam.sdk.util.Sleeper; +import org.apache.beam.sdk.values.PBegin; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PCollectionTuple; +import org.apache.beam.sdk.values.PDone; +import org.apache.beam.sdk.values.TupleTag; +import org.apache.beam.sdk.values.TupleTagList; +import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Throwables; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * {@link HL7v2IO} provides an API for reading from and writing to <a + * href="https://cloud.google.com/healthcare/docs/concepts/hl7v2";>Google Cloud Healthcare HL7v2 API. + * </a> + * + * <p>Read HL7v2 Messages are fetched from the HL7v2 store based on the {@link PCollection} of of + * message IDs {@link String}s produced by the {@link AutoValue_HL7v2IO_Read#getMessageIDTransform} + * as {@link PCollectionTuple}*** containing an {@link HL7v2IO.Read#OUT} tag for successfully + * fetched messages and a {@link HL7v2IO.Read#DEAD_LETTER} tag for message IDs that could not be + * fetched. + * + * <p>HL7v2 stores can be read in several ways: - Unbounded: based on the Pub/Sub Notification + * Channel {@link HL7v2IO#readNotificationSubscription(String)} - Bounded: based on reading an + * entire HL7v2 store (or stores) {@link HL7v2IO#readHL7v2Store(String)} - Bounded: based on reading + * an HL7v2 store with a filter + * + * <p>Note, due to the flexibility of this Read transform, this must output a dead letter queue. + * This handles the scenario where the the PTransform that populates a PCollection of message IDs + * contains message IDs that do not exist in the HL7v2 stores. + * + * <p>Example: + * + * <pre>{@code + * PipelineOptions options = ...; + * Pipeline pipeline = Pipeline.create(options) + * + * + * PCollectionTuple messages = pipeline.apply( + * new HLv2IO.readNotifications(options.getNotificationSubscription()) + * + * // Write errors to your favorite dead letter queue (e.g. Pub/Sub, GCS, BigQuery) + * messages.get(PubsubNotificationToHL7v2Message.DEAD_LETTER) + * .apply("WriteToDeadLetterQueue", ...); + * + * PCollection<Message> fetchedMessages = fetchResults.get(PubsubNotificationToHL7v2Message.OUT) + * .apply("ExtractFetchedMessage", + * MapElements + * .into(TypeDescriptor.of(Message.class)) + * .via(FailsafeElement::getPayload)); + * + * // Go about your happy path transformations. + * PCollection<Message> out = fetchedMessages.apply("ProcessFetchedMessages", ...); + * + * // Write using the Message.Ingest method of the HL7v2 REST API. + * out.apply(HL7v2IO.ingestMessages(options.getOutputHL7v2Store())); + * + * pipeline.run(); + * + * }*** + * </pre> + */ +public class HL7v2IO { + // TODO add metrics for failed records. + + private static Read.Builder read(PTransform<PBegin, PCollection<String>> messageIDTransform) { Review comment: refactored to implement both `HL7v2IO.[Read,Write].Result` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
