mattcasters commented on a change in pull request #15916: URL: https://github.com/apache/beam/pull/15916#discussion_r745606285
########## File path: sdks/java/io/neo4j/src/main/java/org/apache/beam/sdk/io/neo4j/Neo4jIO.java ########## @@ -0,0 +1,1358 @@ +/* + * 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.neo4j; + +import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument; + +import com.google.auto.value.AutoValue; +import java.io.Serializable; +import java.net.URI; +import java.net.URISyntaxException; +import java.time.Duration; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.TimeUnit; +import java.util.logging.Level; +import org.apache.beam.repackaged.core.org.apache.commons.lang3.StringUtils; +import org.apache.beam.sdk.annotations.Experimental; +import org.apache.beam.sdk.coders.Coder; +import org.apache.beam.sdk.harness.JvmInitializer; +import org.apache.beam.sdk.options.ValueProvider; +import org.apache.beam.sdk.schemas.NoSuchSchemaException; +import org.apache.beam.sdk.schemas.Schema; +import org.apache.beam.sdk.schemas.SchemaRegistry; +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.transforms.SerializableFunction; +import org.apache.beam.sdk.transforms.display.DisplayData; +import org.apache.beam.sdk.transforms.display.HasDisplayData; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PDone; +import org.apache.beam.sdk.values.TypeDescriptor; +import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions; +import org.checkerframework.checker.nullness.qual.Nullable; +import org.neo4j.driver.AuthTokens; +import org.neo4j.driver.Config; +import org.neo4j.driver.Driver; +import org.neo4j.driver.GraphDatabase; +import org.neo4j.driver.Logging; +import org.neo4j.driver.Record; +import org.neo4j.driver.Result; +import org.neo4j.driver.Session; +import org.neo4j.driver.SessionConfig; +import org.neo4j.driver.TransactionConfig; +import org.neo4j.driver.TransactionWork; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * This is a Beam IO to read from, and write data to, Neo4j. + * + * <p> + * + * <p> + * + * <h3>Driver configuration</h3> + * + * <p>To read from or write to Neo4j you have to provide a {@link DriverConfiguration} using<br> + * 1. {@link DriverConfiguration#create()} (which must be {@link Serializable});<br> + * 2. or {@link DriverConfiguration#create(String, String, String)} (URL, username and password). + * + * <p>If you have trouble connecting to a Neo4j Aura database please try to disable a few security + * algorithms in your JVM. This makes sure that the right one is picked to connect: + * + * <p> + * + * <pre>{@code + * Security.setProperty( + * "jdk.tls.disabledAlgorithms", + * "SSLv3, RC4, DES, MD5withRSA, DH keySize < 1024, EC keySize < 224, 3DES_EDE_CBC, anon, NULL"); + * }</pre> + * + * <p> + * + * <p> + * + * <p>To execute this code on GCP Dataflow you can create a class which extends {@link + * JvmInitializer} and implement the {@link JvmInitializer#onStartup()} method. You need to annotate + * this new class with {@link com.google.auto.service.AutoService} + * + * <pre>{@code + * @AutoService(value = JvmInitializer.class) + * }</pre> + * + * <p> + * + * <h3>Reading from Neo4j</h3> + * + * <p>{@link Neo4jIO#read()} source returns a bounded collection of {@code OuptutT} as a {@code + * PCollection<OutputT>}. OutputT is the type returned by the provided {@link RowMapper}. It accepts + * parameters as input in the form of {@code ParameterT} as a {@code PCollection<ParameterT>} + * + * <p>The following example reads ages to return the IDs of Person nodes. It runs a Cypher query for + * each provided age. + * + * <p>The {@link ParametersMapper} maps input values to each execution of the Cypher statement. + * These parameter values are stored in a {@link Map} (mapping String to Object). The map is cleared + * after each execution. + * + * <p>The {@link RowMapper} converts output Neo4j {@link Record} values to the output of the source. + * + * <pre>{@code + * pipeline.apply( Neo4jIO.<Integer, String>read() Review comment: Great advice! Thanks @mosche. The sample basics were taken from JdbcIO but it's easy enough to just add an extra line to clarify the example. I'll patch that up in a commit. -- 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. 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