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ZIO LMDB simple example using configuration provider / published by https://github.com/dacr/code-examples-manager #ab2e9b2c-bdcc-4eab-ba9b-3ab3953429c7/3e2c2d4718eae92a2e399d654d984de07928490e
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// summary : ZIO LMDB simple example using configuration provider | |
// keywords : scala, zio, lmdb, @testable | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : ab2e9b2c-bdcc-4eab-ba9b-3ab3953429c7 | |
// created-on : 2023-04-29T22:48:17+02:00 | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "3.3.1" | |
//> using dep "fr.janalyse::zio-lmdb:1.8.0" | |
//> using dep "dev.zio::zio-config:4.0.1" | |
//> using dep "dev.zio::zio-config-typesafe:4.0.1" | |
//> using javaOpt "--add-opens", "java.base/java.nio=ALL-UNNAMED", "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED" | |
// --------------------- | |
import zio.* | |
import zio.lmdb.* | |
import zio.json.* | |
import zio.config.typesafe.* | |
import java.io.File | |
import java.util.UUID | |
import java.time.OffsetDateTime | |
case class Record( | |
uuid: UUID, | |
name: String, | |
age: Int, | |
addedOn: OffsetDateTime | |
) derives JsonCodec | |
object SimpleExample extends ZIOAppDefault { | |
// Simulating a configuration, or use .fromResourcePath to automatically load configs from class path | |
val configProvider = | |
ConfigProvider.fromHoconString( | |
input = s"""lmdb { | |
| name = my-database | |
| home = /tmp | |
| sync = false | |
| maxReaders = 10 | |
|} | |
|""".stripMargin | |
) | |
override val bootstrap: ZLayer[ZIOAppArgs, Any, Any] = Runtime.setConfigProvider(configProvider) | |
override def run = example.provide(LMDB.live, Scope.default) | |
val collectionName = "examples" | |
val example = for { | |
examples <- LMDB.collectionCreate[Record](collectionName, failIfExists = false) | |
recordId <- Random.nextUUID | |
dateTime <- Clock.currentDateTime | |
record = Record(recordId, "John Doe", 42, dateTime) | |
_ <- examples.upsertOverwrite(recordId.toString, record) | |
gotten <- examples.fetch(recordId.toString).some | |
collected <- examples.collect() | |
_ <- Console.printLine(s"collection $collectionName contains ${collected.size} records") | |
_ <- ZIO.foreach(collected)(record => Console.printLine(record)) | |
lmdb <- ZIO.service[LMDB] | |
_ <- Console.printLine("""LMDB standard tools can be used to manage the database content : sudo apt-get install lmdb-utils""") | |
_ <- Console.printLine(s"""To get some statistics : mdb_stat -s $collectionName ${lmdb.databasePath}/""") | |
_ <- Console.printLine(s"""To dump collection content : mdb_dump -p -s $collectionName ${lmdb.databasePath}/""") | |
} yield () | |
} | |
SimpleExample.main(Array.empty) |
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