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DatastoreToText.java
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DatastoreToText.java
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/*
* Copyright (C) 2018 Google Inc.
*
* Licensed 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 com.google.cloud.teleport.templates;
import com.google.cloud.teleport.templates.common.DatastoreConverters.DatastoreReadOptions;
import com.google.cloud.teleport.templates.common.DatastoreConverters.ReadJsonEntities;
import com.google.cloud.teleport.templates.common.JavascriptTextTransformer.JavascriptTextTransformerOptions;
import com.google.cloud.teleport.templates.common.JavascriptTextTransformer.TransformTextViaJavascript;
import com.google.cloud.teleport.templates.common.TextConverters.FilesystemWriteOptions;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
/**
* Dataflow template which copies Datastore Entities to a Text sink.
* Text is encoded using JSON encoded entity in the v1/Entity rest format:
* https://cloud.google.com/datastore/docs/reference/rest/v1/Entity
*/
public class DatastoreToText {
/**
* Custom PipelineOptions.
*/
public interface DatastoreToTextOptions extends
PipelineOptions,
DatastoreReadOptions,
JavascriptTextTransformerOptions,
FilesystemWriteOptions {}
/**
* Runs a pipeline which reads in Entities from Datastore, passes in the JSON encoded Entities
* to a Javascript UDF, and writes the JSON to TextIO sink.
*
* @param args arguments to the pipeline
*/
public static void main(String[] args) {
DatastoreToTextOptions options = PipelineOptionsFactory.fromArgs(args)
.withValidation()
.as(DatastoreToTextOptions.class);
Pipeline pipeline = Pipeline.create(options);
pipeline
.apply(ReadJsonEntities.newBuilder()
.setGqlQuery(options.getDatastoreReadGqlQuery())
.setProjectId(options.getDatastoreReadProjectId())
.setNamespace(options.getDatastoreReadNamespace())
.build())
.apply(TransformTextViaJavascript.newBuilder()
.setFileSystemPath(options.getJavascriptTextTransformGcsPath())
.setFunctionName(options.getJavascriptTextTransformFunctionName())
.build())
.apply(TextIO.write()
.to(options.getTextWritePrefix())
.withSuffix(".json"));
pipeline.run();
}
}