davisusanibar commented on a change in pull request #137: URL: https://github.com/apache/arrow-cookbook/pull/137#discussion_r824951170
########## File path: java/source/flight.rst ########## @@ -0,0 +1,511 @@ +.. 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. + +============ +Arrow Flight +============ + +This section contains a number of recipes for working with Arrow Flight. +For more detail about Flight please take a look at `Arrow Flight RPC`_. + +.. contents:: + +Simple Key-Value Storage Service with Arrow Flight +================================================== + +We'll implement a service that provides a key-value store for data, using Flight to handle uploads/requests +and data in memory to store the actual data. + +Flight Client and Server +************************ + +.. testcode:: + + import org.apache.arrow.flight.Action; + import org.apache.arrow.flight.AsyncPutListener; + import org.apache.arrow.flight.CallStatus; + import org.apache.arrow.flight.Criteria; + import org.apache.arrow.flight.FlightClient; + import org.apache.arrow.flight.FlightDescriptor; + import org.apache.arrow.flight.FlightEndpoint; + import org.apache.arrow.flight.FlightInfo; + import org.apache.arrow.flight.FlightServer; + import org.apache.arrow.flight.FlightStream; + import org.apache.arrow.flight.Location; + import org.apache.arrow.flight.NoOpFlightProducer; + import org.apache.arrow.flight.PutResult; + import org.apache.arrow.flight.Result; + import org.apache.arrow.flight.Ticket; + import org.apache.arrow.memory.RootAllocator; + import org.apache.arrow.vector.VarCharVector; + import org.apache.arrow.vector.VectorLoader; + import org.apache.arrow.vector.VectorSchemaRoot; + import org.apache.arrow.vector.VectorUnloader; + import org.apache.arrow.vector.ipc.message.ArrowRecordBatch; + import org.apache.arrow.vector.types.pojo.ArrowType; + import org.apache.arrow.vector.types.pojo.Field; + import org.apache.arrow.vector.types.pojo.FieldType; + import org.apache.arrow.vector.types.pojo.Schema; + + import java.io.IOException; + import java.nio.charset.StandardCharsets; + import java.util.ArrayList; + import java.util.Arrays; + import java.util.Collections; + import java.util.Iterator; + import java.util.List; + import java.util.concurrent.ConcurrentHashMap; + + class DataInMemory { + private List<ArrowRecordBatch> listArrowRecordBatch; + private Schema schema; + private long rows; + private NoOpFlightProducer cookbookProducer; + public DataInMemory(List<ArrowRecordBatch> listArrowRecordBatch, Schema schema, long rows) { + this.listArrowRecordBatch = listArrowRecordBatch; + this.schema = schema; + this.rows = rows; + } + public DataInMemory(List<ArrowRecordBatch> listArrowRecordBatch, Schema schema, long rows, NoOpFlightProducer cookbookProducer) { + this.listArrowRecordBatch = listArrowRecordBatch; + this.schema = schema; + this.rows = rows; + this.cookbookProducer = cookbookProducer; + } + public List<ArrowRecordBatch> getListArrowRecordBatch() { + return listArrowRecordBatch; + } + public Schema getSchema() { + return schema; + } + public long getRows() { + return rows; + } + public NoOpFlightProducer getCookbookProducer() { + return cookbookProducer; + } + public void setCookbookProducer(NoOpFlightProducer cookbookProducer) { + this.cookbookProducer = cookbookProducer; + } + } + class CookbookProducer extends NoOpFlightProducer { + private RootAllocator allocator; + private Location location; + + public CookbookProducer(RootAllocator allocator, Location location) { + this.allocator = allocator; + this.location = location; + } + + ConcurrentHashMap<FlightDescriptor, DataInMemory> dataInMemory = new ConcurrentHashMap<>(); Review comment: Updated -- 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. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
