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TextToDatastore.java
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TextToDatastore.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.DatastoreWriteOptions;
import com.google.cloud.teleport.templates.common.DatastoreConverters.WriteJsonEntities;
import com.google.cloud.teleport.templates.common.ErrorConverters.ErrorWriteOptions;
import com.google.cloud.teleport.templates.common.ErrorConverters.LogErrors;
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.FilesystemReadOptions;
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;
import org.apache.beam.sdk.values.TupleTag;
/**
* Dataflow template which reads from a Text Source and writes JSON encoded Entities into Datastore.
* The Json is expected to be in the format of:
* https://cloud.google.com/datastore/docs/reference/rest/v1/Entity
*/
public class TextToDatastore {
/**
* TextToDatastore Pipeline Options.
*/
public interface TextToDatastoreOptions extends
PipelineOptions,
FilesystemReadOptions,
JavascriptTextTransformerOptions,
DatastoreWriteOptions,
ErrorWriteOptions {}
/**
* Runs a pipeline which reads from a Text Source, passes the Text to a Javascript UDF,
* writes the JSON encoded Entities to a TextIO sink.
*
* <p>If your Text Source does not contain JSON encoded Entities, then you'll need to supply a
* Javascript UDF which transforms your data to be JSON encoded Entities.
*
* @param args arguments to the pipeline
*/
public static void main(String[] args) {
TextToDatastoreOptions options = PipelineOptionsFactory.fromArgs(args)
.withValidation()
.as(TextToDatastoreOptions.class);
TupleTag<String> errorTag = new TupleTag<String>("errors"){};
Pipeline pipeline = Pipeline.create(options);
pipeline
.apply(TextIO.read()
.from(options.getTextReadPattern()))
.apply(TransformTextViaJavascript.newBuilder()
.setFileSystemPath(options.getJavascriptTextTransformGcsPath())
.setFunctionName(options.getJavascriptTextTransformFunctionName())
.build())
.apply(WriteJsonEntities.newBuilder()
.setProjectId(options.getDatastoreWriteProjectId())
.setErrorTag(errorTag)
.build())
.apply(LogErrors.newBuilder()
.setErrorWritePath(options.getErrorWritePath())
.setErrorTag(errorTag)
.build());
pipeline.run();
}
}