AWS SQS

Amazon Simple Queue Service

Amazon Simple Queue Service (Amazon SQS) offers a secure, durable, and available hosted queue that lets you integrate and decouple distributed software systems and components. Amazon SQS offers common constructs such as dead-letter queues and cost allocation tags. It provides a generic web services API and it can be accessed by any programming language that the AWS SDK supports.

For more information about AWS SQS please visit the official documentation.

The AWS SQS connector provides Akka Stream sources and sinks for AWS SQS queues.

Project Info: Alpakka AWS SQS
Artifact	com.lightbend.akka akka-stream-alpakka-sqs 3.0.4 Snapshots are available
JDK versions	Adopt OpenJDK 8 Adopt OpenJDK 11
Scala versions	2.12.11, 2.13.3
JPMS module name	akka.stream.alpakka.aws.sqs
License	Apache-2.0
Readiness level	Community-driven Since 0.3, 2016-12-02
Home page	https://doc.akka.io/docs/alpakka/current
API documentation	API (Scaladoc)
Forums	Lightbend Discuss
Release notes	GitHub releases
Issues	Github issues
Sources	https://github.com/akka/alpakka

Artifacts

sbt

val AkkaVersion = "2.6.14"
val AkkaHttpVersion = "10.1.11"
libraryDependencies ++= Seq(
  "com.lightbend.akka" %% "akka-stream-alpakka-sqs" % "3.0.4",
  "com.typesafe.akka" %% "akka-stream" % AkkaVersion,
  "com.typesafe.akka" %% "akka-http" % AkkaHttpVersion
)

Maven

<properties>
  <akka.version>2.6.14</akka.version>
  <akka.http.version>10.1.11</akka.http.version>
  <scala.binary.version>2.12</scala.binary.version>
</properties>
<dependencies>
  <dependency>
    <groupId>com.lightbend.akka</groupId>
    <artifactId>akka-stream-alpakka-sqs_${scala.binary.version}</artifactId>
    <version>3.0.4</version>
  </dependency>
  <dependency>
    <groupId>com.typesafe.akka</groupId>
    <artifactId>akka-stream_${scala.binary.version}</artifactId>
    <version>${akka.version}</version>
  </dependency>
  <dependency>
    <groupId>com.typesafe.akka</groupId>
    <artifactId>akka-http_${scala.binary.version}</artifactId>
    <version>${akka.http.version}</version>
  </dependency>
</dependencies>

Gradle

def versions = [
  AkkaVersion: "2.6.14",
  AkkaHttpVersion: "10.1.11",
  ScalaBinary: "2.12"
]
dependencies {
  implementation "com.lightbend.akka:akka-stream-alpakka-sqs_${versions.ScalaBinary}:3.0.4"
  implementation "com.typesafe.akka:akka-stream_${versions.ScalaBinary}:${versions.AkkaVersion}"
  implementation "com.typesafe.akka:akka-http_${versions.ScalaBinary}:${versions.AkkaHttpVersion}"
}

The table below shows direct dependencies of this module and the second tab shows all libraries it depends on transitively.

Direct dependencies

Organization	Artifact	Version
com.fasterxml.jackson.core	jackson-core	2.11.4
com.fasterxml.jackson.core	jackson-databind	2.11.4
com.github.matsluni	aws-spi-akka-http_2.12	0.0.11
com.typesafe.akka	akka-http_2.12	10.1.11
com.typesafe.akka	akka-stream_2.12	2.6.14
org.scala-lang	scala-library	2.12.11
software.amazon.awssdk	sqs	2.11.14

Dependency tree

com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
com.github.matsluni    aws-spi-akka-http_2.12    0.0.11    Apache-2.0
    org.scala-lang.modules    scala-collection-compat_2.12    2.3.1    Apache-2.0
        org.scala-lang    scala-library    2.12.11    Apache-2.0
    org.scala-lang    scala-library    2.12.11    Apache-2.0
    software.amazon.awssdk    http-client-spi    2.11.14
        org.reactivestreams    reactive-streams    1.0.3    CC0
        software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    utils    2.11.14
            org.reactivestreams    reactive-streams    1.0.3    CC0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
com.typesafe.akka    akka-http_2.12    10.1.11    Apache-2.0
    com.typesafe.akka    akka-http-core_2.12    10.1.11    Apache-2.0
        com.typesafe.akka    akka-parsing_2.12    10.1.11    Apache-2.0
            org.scala-lang    scala-library    2.12.11    Apache-2.0
        org.scala-lang    scala-library    2.12.11    Apache-2.0
    org.scala-lang    scala-library    2.12.11    Apache-2.0
com.typesafe.akka    akka-stream_2.12    2.6.14    Apache-2.0
    com.typesafe.akka    akka-actor_2.12    2.6.14    Apache-2.0
        com.typesafe    config    1.4.0    Apache-2.0
        org.scala-lang.modules    scala-java8-compat_2.12    0.8.0    BSD 3-clause
            org.scala-lang    scala-library    2.12.11    Apache-2.0
        org.scala-lang    scala-library    2.12.11    Apache-2.0
    com.typesafe.akka    akka-protobuf-v3_2.12    2.6.14    Apache-2.0
    com.typesafe    ssl-config-core_2.12    0.4.2    Apache-2.0
        com.typesafe    config    1.4.0    Apache-2.0
        org.scala-lang.modules    scala-parser-combinators_2.12    1.1.2    Apache-2.0
            org.scala-lang    scala-library    2.12.11    Apache-2.0
        org.scala-lang    scala-library    2.12.11    Apache-2.0
    org.reactivestreams    reactive-streams    1.0.3    CC0
    org.scala-lang    scala-library    2.12.11    Apache-2.0
org.scala-lang    scala-library    2.12.11    Apache-2.0
software.amazon.awssdk    sqs    2.11.14
    software.amazon.awssdk    annotations    2.11.14
    software.amazon.awssdk    auth    2.11.14
        com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
        software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    http-client-spi    2.11.14
            org.reactivestreams    reactive-streams    1.0.3    CC0
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    profiles    2.11.14
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    regions    2.11.14
            com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    profiles    2.11.14
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    sdk-core    2.11.14
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    http-client-spi    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    profiles    2.11.14
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    sdk-core    2.11.14
            com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            org.reactivestreams    reactive-streams    1.0.3    CC0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    http-client-spi    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    profiles    2.11.14
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    utils    2.11.14
            org.reactivestreams    reactive-streams    1.0.3    CC0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
        software.amazon.eventstream    eventstream    1.0.1    Apache License, Version 2.0
    software.amazon.awssdk    aws-core    2.11.14
        org.slf4j    slf4j-api    1.7.28
        software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    auth    2.11.14
            com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    http-client-spi    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    profiles    2.11.14
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    regions    2.11.14
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    profiles    2.11.14
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    sdk-core    2.11.14
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                        com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                        com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    http-client-spi    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        software.amazon.awssdk    annotations    2.11.14
                        software.amazon.awssdk    utils    2.11.14
                            org.reactivestreams    reactive-streams    1.0.3    CC0
                            org.slf4j    slf4j-api    1.7.28
                            software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    profiles    2.11.14
                        software.amazon.awssdk    annotations    2.11.14
                        software.amazon.awssdk    utils    2.11.14
                            org.reactivestreams    reactive-streams    1.0.3    CC0
                            org.slf4j    slf4j-api    1.7.28
                            software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    sdk-core    2.11.14
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    http-client-spi    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    profiles    2.11.14
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
            software.amazon.eventstream    eventstream    1.0.1    Apache License, Version 2.0
        software.amazon.awssdk    http-client-spi    2.11.14
            org.reactivestreams    reactive-streams    1.0.3    CC0
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    profiles    2.11.14
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    regions    2.11.14
            com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    profiles    2.11.14
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    sdk-core    2.11.14
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    http-client-spi    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    profiles    2.11.14
                    software.amazon.awssdk    annotations    2.11.14
                    software.amazon.awssdk    utils    2.11.14
                        org.reactivestreams    reactive-streams    1.0.3    CC0
                        org.slf4j    slf4j-api    1.7.28
                        software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    sdk-core    2.11.14
            com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
            org.reactivestreams    reactive-streams    1.0.3    CC0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    http-client-spi    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    profiles    2.11.14
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    utils    2.11.14
                    org.reactivestreams    reactive-streams    1.0.3    CC0
                    org.slf4j    slf4j-api    1.7.28
                    software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    utils    2.11.14
                org.reactivestreams    reactive-streams    1.0.3    CC0
                org.slf4j    slf4j-api    1.7.28
                software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    utils    2.11.14
            org.reactivestreams    reactive-streams    1.0.3    CC0
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
        software.amazon.eventstream    eventstream    1.0.1    Apache License, Version 2.0
    software.amazon.awssdk    aws-query-protocol    2.11.14
        software.amazon.awssdk    annotations    2.11.14
        software.amazon.awssdk    aws-core    2.11.14
            org.slf4j    slf4j-api    1.7.28
            software.amazon.awssdk    annotations    2.11.14
            software.amazon.awssdk    auth    2.11.14
                com.fasterxml.jackson.core    jackson-databind    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-annotations    2.11.4    The Apache Software License, Version 2.0
                    com.fasterxml.jackson.core    jackson-core    2.11.4    The Apache Software License, Version 2.0
                software.amazon.awssdk    annotations    2.11.14
                software.amazon.awssdk    http-client-spi    2.11.14
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Setup

Prepare an ActorSystemActorSystem.

Scala

sourceimplicit val system: ActorSystem = ActorSystem()

Java

sourcesystem = ActorSystem.create();

This connector requires an implicit SqsAsyncClient instance to communicate with AWS SQS.

It is your code’s responsibility to call close to free any resources held by the client. In this example it will be called when the actor system is terminated.

Scala

sourceimport com.github.matsluni.akkahttpspi.AkkaHttpClient
import software.amazon.awssdk.auth.credentials.{AwsBasicCredentials, StaticCredentialsProvider}
import software.amazon.awssdk.regions.Region
import software.amazon.awssdk.services.sqs.SqsAsyncClient
import software.amazon.awssdk.services.sqs.model.CreateQueueRequest

// Don't encode credentials in your source code!
// see https://doc.akka.io/docs/alpakka/current/aws-shared-configuration.html
val credentialsProvider = StaticCredentialsProvider.create(AwsBasicCredentials.create("x", "x"))
implicit val awsSqsClient = SqsAsyncClient
  .builder()
  .credentialsProvider(credentialsProvider)
  .region(Region.EU_CENTRAL_1)
  .httpClient(AkkaHttpClient.builder().withActorSystem(system).build())
  // Possibility to configure the retry policy
  // see https://doc.akka.io/docs/alpakka/current/aws-shared-configuration.html
  // .overrideConfiguration(...)
  .build()

system.registerOnTermination(awsSqsClient.close())

Java

sourceimport com.github.matsluni.akkahttpspi.AkkaHttpClient;
import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sqs.SqsAsyncClient;

// Don't encode credentials in your source code!
// see https://doc.akka.io/docs/alpakka/current/aws-shared-configuration.html
StaticCredentialsProvider credentialsProvider =
    StaticCredentialsProvider.create(AwsBasicCredentials.create("x", "x"));
SqsAsyncClient sqsClient =
    SqsAsyncClient.builder()
        .credentialsProvider(credentialsProvider)
        .region(Region.EU_CENTRAL_1)
        .httpClient(AkkaHttpClient.builder().withActorSystem(system).build())
        // Possibility to configure the retry policy
        // see https://doc.akka.io/docs/alpakka/current/aws-shared-configuration.html
        // .overrideConfiguration(...)
        .build();

system.registerOnTermination(() -> sqsClient.close());

The example above uses Akka HTTP as the default HTTP client implementation. For more details about the HTTP client, configuring request retrying and best practices for credentials, see AWS client configuration for more details.

Read from an SQS queue

The SqsSourceSqsSource created source reads AWS Java SDK SQS Message objects from any SQS queue given by the queue URL.

Scala

sourceval messages: Future[immutable.Seq[Message]] =
  SqsSource(
    queueUrl,
    SqsSourceSettings().withCloseOnEmptyReceive(true).withWaitTime(10.millis)
  ).runWith(Sink.seq)

Java

sourcefinal CompletionStage<List<Message>> messages =
    SqsSource.create(
            queueUrl,
            SqsSourceSettings.create()
                .withCloseOnEmptyReceive(true)
                .withWaitTime(Duration.ofMillis(10)),
            sqsClient)
        .runWith(Sink.seq(), system);

In this example we use the closeOnEmptyReceive to let the stream complete when there are no more messages on the queue. In realistic scenarios, you should add a KillSwitch to the stream, see “Controlling stream completion with KillSwitch” in the Akka documentation.

Source configuration

Scala

sourceval settings = SqsSourceSettings()
  .withWaitTime(20.seconds)
  .withMaxBufferSize(100)
  .withMaxBatchSize(10)
  .withAttributes(immutable.Seq(SenderId, SentTimestamp))
  .withMessageAttribute(MessageAttributeName.create("bar.*"))
  .withCloseOnEmptyReceive(true)
  .withVisibilityTimeout(10.seconds)

Java

sourceSqsSourceSettings settings =
    SqsSourceSettings.create()
        .withWaitTime(Duration.ofSeconds(20))
        .withMaxBufferSize(100)
        .withMaxBatchSize(10)
        .withAttributes(
            Arrays.asList(
                MessageSystemAttributeName.senderId(),
                MessageSystemAttributeName.sentTimestamp()))
        .withMessageAttribute(MessageAttributeName.create("bar.*"))
        .withCloseOnEmptyReceive(true);

Options:

maxBatchSize - the maximum number of messages to return per request (allowed values 1-10, see MaxNumberOfMessages in AWS docs). Default: 10
maxBufferSize - internal buffer size used by the Source. Default: 100 messages
waitTimeSeconds - the duration for which the call waits for a message to arrive in the queue before returning (see WaitTimeSeconds in AWS docs). Default: 20 seconds
closeOnEmptyReceive - If true, the source completes when no messages are available.

More details are available in the AWS SQS Receive Message documentation.

An SqsSource can either provide an infinite stream of messages (the default), or can drain its source queue until no further messages are available. The latter behaviour is enabled by setting the closeOnEmptyReceive flag on creation. If set, the Source will receive messages until it encounters an empty reply from the server. It then continues to emit any remaining messages in its local buffer. The stage will complete once the last message has been sent downstream.

Note that for short-polling (waitTimeSeconds of 0), SQS may respond with an empty reply even if there are still messages in the queue. This behavior can be prevented by switching to long-polling (by setting waitTimeSeconds to a nonzero value).

Be aware that the SqsSource runs multiple requests to Amazon SQS in parallel. The maximum number of concurrent requests is limited by parallelism = maxBufferSize / maxBatchSize. E.g.: By default maxBatchSize is set to 10 and maxBufferSize is set to 100 so at the maximum, SqsSource will run 10 concurrent requests to Amazon SQS.

Publish messages to an SQS queue

Create a String-accepting sink, publishing to an SQS queue.

Scala

sourceSource
  .single("alpakka")
  .runWith(SqsPublishSink(queueUrl))

Java

sourceSource.single("alpakka")
    .runWith(
        SqsPublishSink.create(queueUrl, SqsPublishSettings.create(), sqsClient), system);

Create a SendMessageRequest-accepting sink, that publishes an SQS queue.

Scala

source// for fix SQS queue
Source
  .single(SendMessageRequest.builder().messageBody("alpakka").build())
  .runWith(SqsPublishSink.messageSink(queueUrl))

// for dynamic SQS queues
Source
  .single(SendMessageRequest.builder().messageBody("alpakka").queueUrl(queueUrl).build())
  .runWith(SqsPublishSink.messageSink())

Java

source// for fix SQS queue
Source.single(SendMessageRequest.builder().messageBody("alpakka").build())
    .runWith(
        SqsPublishSink.messageSink(queueUrl, SqsPublishSettings.create(), sqsClient),
        system);

// for dynamic SQS queues
Source.single(
        SendMessageRequest.builder().messageBody("alpakka").queueUrl(queueUrl).build())
    .runWith(SqsPublishSink.messageSink(SqsPublishSettings.create(), sqsClient), system);

You can also build flow stages which publish messages to SQS queues, backpressure on queue response, and then forward SqsPublishResultSqsPublishResult further down the stream.

Scala

source// for fix SQS queue
Source
  .single(SendMessageRequest.builder().messageBody("alpakka").build())
  .via(SqsPublishFlow(queueUrl))
  .runWith(Sink.head)

// for dynamic SQS queues
Source
  .single(SendMessageRequest.builder().messageBody("alpakka").queueUrl(queueUrl).build())
  .via(SqsPublishFlow())
  .runWith(Sink.head)

Java

source// for fix SQS queue
Source.single(SendMessageRequest.builder().messageBody("alpakka-flow").build())
    .via(SqsPublishFlow.create(queueUrl, SqsPublishSettings.create(), sqsClient))
    .runWith(Sink.head(), system);

// for dynamic SQS queues
Source.single(
        SendMessageRequest.builder().messageBody("alpakka-flow").queueUrl(queueUrl).build())
    .via(SqsPublishFlow.create(SqsPublishSettings.create(), sqsClient))
    .runWith(Sink.head(), system);

Group messages and publish batches to an SQS queue

Create a sink, that forwards String to the SQS queue. However, the main difference from the previous use case, it batches items and sends as one request and forwards a SqsPublishResultEntrySqsPublishResultEntry further down the stream for each item processed.

Note: There is also another option to send a batch of messages to SQS which is using AmazonSQSBufferedAsyncClient. This client buffers SendMessageRequests under the hood and sends them as a batch instead of sending them one by one. However, beware that AmazonSQSBufferedAsyncClient does not support FIFO Queues. See documentation for client-side buffering.

Scala

sourceval messages = for (i <- 0 until 10) yield s"Message - $i"

val future = Source(messages)
  .runWith(SqsPublishSink.grouped(queueUrl, SqsPublishGroupedSettings.Defaults.withMaxBatchSize(2)))

Java

sourceList<String> messagesToSend = new ArrayList<>();
for (int i = 0; i < 20; i++) {
  messagesToSend.add("message - " + i);
}

CompletionStage<Done> done =
    Source.from(messagesToSend)
        .runWith(
            SqsPublishSink.grouped(queueUrl, SqsPublishGroupedSettings.create(), sqsClient),
            system);

Grouping configuration

Scala

sourceval batchSettings =
  SqsPublishGroupedSettings()
    .withMaxBatchSize(10)
    .withMaxBatchWait(500.millis)
    .withConcurrentRequests(1)

Java

sourceSqsPublishGroupedSettings batchSettings =
    SqsPublishGroupedSettings.create()
        .withMaxBatchSize(10)
        .withMaxBatchWait(Duration.ofMillis(500))
        .withConcurrentRequests(1);

Options:

maxBatchSize - the maximum number of messages in batch to send SQS. Default: 10.
maxBatchWait - the maximum duration for which the stage waits until maxBatchSize messages arrived. Sends what is collects at the end of the time period even though the maxBatchSize is not fulfilled. Default: 500 milliseconds
concurrentRequests - the number of batches sending to SQS concurrently.

Publish lists as batches to an SQS queue

Create a sink, that publishes Iterable[String]Iterable<String> to the SQS queue.

Scala

sourceval messages = for (i <- 0 until 10) yield s"Message - $i"

val future = Source
  .single(messages)
  .runWith(SqsPublishSink.batch(queueUrl))

Java

sourceList<String> messagesToSend = new ArrayList<>();
for (int i = 0; i < 10; i++) {
  messagesToSend.add("Message - " + i);
}

CompletionStage<Done> done =
    Source.single(messagesToSend)
        .runWith(
            SqsPublishSink.batch(queueUrl, SqsPublishBatchSettings.create(), sqsClient),
            system);

Create a sink, that publishes Iterable[SendMessageRequest]Iterable<SendMessageRequest> to the SQS queue.

Warning

Be aware that the size of the batch must be less than or equal to 10 because Amazon SQS has a limit for batch requests. If the batch has more than 10 entries, the request will fail.

Scala

sourceval messages = for (i <- 0 until 10) yield SendMessageRequest.builder().messageBody(s"Message - $i").build()

val future = Source
  .single(messages)
  .runWith(SqsPublishSink.batchedMessageSink(queueUrl))

Java

sourceList<SendMessageRequest> messagesToSend = new ArrayList<>();
for (int i = 0; i < 10; i++) {
  messagesToSend.add(SendMessageRequest.builder().messageBody("Message - " + i).build());
}

CompletionStage<Done> done =
    Source.single(messagesToSend)
        .runWith(
            SqsPublishSink.batchedMessageSink(
                queueUrl, SqsPublishBatchSettings.create(), sqsClient),
            system);

Batch configuration

Scala

sourceval batchSettings =
  SqsPublishBatchSettings()
    .withConcurrentRequests(1)

Java

sourceSqsPublishBatchSettings batchSettings =
    SqsPublishBatchSettings.create().withConcurrentRequests(1);

Options:

concurrentRequests - the number of batches sending to SQS concurrently.

Updating message statuses

SqsAckSink and SqsAckFlow provide the possibility to acknowledge (delete), ignore, or postpone messages on an SQS queue. They accept MessageActionMessageAction sub-classes to select the action to be taken.

For every message you may decide which action to take and push it together with message back to the queue:

Delete - delete message from the queue
Ignore - don’t change that message, and let it reappear in the queue after the visibility timeout
ChangeMessageVisibility(visibilityTimeout) - can be used to postpone a message, or make the message immediately visible to other consumers. See official documentation for more details.

Acknowledge (delete) messages

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(1)
  .map(MessageAction.Delete(_))
  .runWith(SqsAckSink(queueUrl))

Java

sourcesource
    .map(m -> MessageAction.delete(m))
    .runWith(SqsAckSink.create(queueUrl, SqsAckSettings.create(), awsClient), system);

Ignore messages

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(1)
  .map(MessageAction.Ignore(_))
  .runWith(SqsAckSink(queueUrl))

Java

sourcesource
    .map(m -> MessageAction.ignore(m))
    .via(SqsAckFlow.create(queueUrl, SqsAckSettings.create(), awsClient))
    .runWith(Sink.seq(), system);

Change Visibility Timeout of messages

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(1)
  .map(MessageAction.ChangeMessageVisibility(_, 5.minutes))
  .runWith(SqsAckSink(queueUrl))

Java

sourcesource
    .map(m -> MessageAction.changeMessageVisibility(m, 12))
    .runWith(SqsAckSink.create(queueUrl, SqsAckSettings.create(), awsClient), system);

Update message status in a flow

The SqsAckFlow forwards a SqsAckResultSqsAckResult sub-class down the stream:

DeleteResult to acknowledge message deletion
ChangeMessageVisibilityResult to acknowledge message visibility change
In case of Ignore action, nothing is performed on the sqs queue, thus no SqsAckResult is forwarded.

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(1)
  .map(MessageAction.Delete(_))
  .via(SqsAckFlow(queueUrl))
  .runWith(Sink.head)

Java

sourcesource
    .map(m -> MessageAction.delete(m))
    .via(SqsAckFlow.create(queueUrl, SqsAckSettings.create(), awsClient))
    .runWith(Sink.seq(), system);

SqsAck configuration

Scala

sourceval sinkSettings =
  SqsAckSettings()
    .withMaxInFlight(10)

Java

sourceSqsAckSettings sinkSettings = SqsAckSettings.create().withMaxInFlight(10);

Options:

maxInFlight - maximum number of messages being processed by AmazonSQSAsync at the same time. Default: 10

Updating message statuses in batches with grouping

SqsAckFlow.grouped batches actions on their type and forwards a SqsAckResultEntrySqsAckResultEntry sub-class for each item processed:

DeleteResultEntry to acknowledge message deletion
ChangeMessageVisibilityResultEntry to acknowledge message visibility change
In case of Ignore action, nothing is performed on the sqs queue, thus no SqsAckResult is forwarded.

Acknowledge (delete) messages:

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(10)
  .map(MessageAction.Delete(_))
  .via(SqsAckFlow.grouped(queueUrl, SqsAckGroupedSettings.Defaults))
  .runWith(Sink.seq)

Java

sourcesource
    .map(m -> MessageAction.delete(m))
    .via(SqsAckFlow.grouped(queueUrl, SqsAckGroupedSettings.create(), awsClient))
    .runWith(Sink.seq(), system);

Ignore messages:

Scala

sourceSource(messages)
  .take(10)
  .map(MessageAction.Ignore(_))
  .via(SqsAckFlow.grouped("queue", SqsAckGroupedSettings.Defaults))
  .runWith(Sink.seq)

Java

sourcesource
    .map(m -> MessageAction.ignore(m))
    .via(SqsAckFlow.grouped(queueUrl, SqsAckGroupedSettings.create(), awsClient))
    .runWith(Sink.seq(), system);

Change Visibility Timeout of messages:

Scala

sourceSqsSource(queueUrl, sqsSourceSettings)
  .take(10)
  .map(MessageAction.ChangeMessageVisibility(_, 5.minutes))
  .via(SqsAckFlow.grouped(queueUrl, SqsAckGroupedSettings.Defaults))
  .runWith(Sink.seq)

Java

sourcesource
    .map(m -> MessageAction.changeMessageVisibility(m, 5))
    .via(SqsAckFlow.grouped(queueUrl, SqsAckGroupedSettings.create(), awsClient))
    .runWith(Sink.seq(), system);

Acknowledge grouping configuration

Scala

sourceval batchSettings =
  SqsAckGroupedSettings()
    .withMaxBatchSize(10)
    .withMaxBatchWait(500.millis)
    .withConcurrentRequests(1)

Java

sourceSqsAckGroupedSettings flowSettings =
    SqsAckGroupedSettings.create()
        .withMaxBatchSize(10)
        .withMaxBatchWait(Duration.ofMillis(500))
        .withConcurrentRequests(1);

Options:

maxBatchSize - the maximum number of messages in batch to send SQS. Default: 10.
maxBatchWait - the maximum duration for which the stage waits until maxBatchSize messages arrived. Sends what is collects at the end of the time period even though the maxBatchSize is not fulfilled. Default: 500 milliseconds
concurrentRequests - the number of batches sending to SQS concurrently.

Integration testing

For integration testing without touching Amazon SQS, Alpakka uses ElasticMQ, a queuing service which serves an AWS SQS compatible API.