Guice VS aws-lambda-java-libs

Historically, Ports and Adapters was born in the context where Dependency Inversion Principle (DIP) was getting hot, back in the beginning of the 2000’s. DIP was getting more present on development day to day, and an example of a framework that was a pioneer in such topic is Google Guice.

“There are many advantages to using dependency injection, but doing so manually often leads to a large amount of boilerplate code to be written. Guice is a framework that makes it possible to write code that uses dependency injection without the hassle of writing much of that boilerplate code”

This is a common misconception. Guice’s docs delineate between dependency injection as a pattern and Guice as a framework that supports that pattern.

https://github.com/google/guice/wiki

You can (and it's very normal to) use that with new. Dependency injection frameworks (like guice) let you skip passing long parameter lists to constructor arguments like you mention. But you don't really NEED that. They also will solve circular dependency issues and some other things, although a strong argument could be made that you should simply restructure your code so that those issues don't exist.

Bob was a nice guy. We had an overlapping tenure at Google in the 2000s. He was one of the original authors of the Guice dependency injection framework: https://github.com/google/guice. When I was earning Java readability at Google, I was fortunate to have had him assigned as a reviewer. Huge loss; he left a very positive impression on me.

He was fairly well known figure in the Java world. RIP.

[1] https://github.com/google/guice

Usually each context has a different scope and lifetime associated with it. Here, it sounds like there are two distinct scopes: server and request (cf. how Guice models scopes: https://github.com/google/guice/wiki/Scopes). It is rarely sensible to merge the scopes or contexts together. If we think about a context, it contains several things:

Exception in thread "main" com.google.inject.CreationException: Unable to create injector, see the following errors: 1) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? MoreSearchAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:57) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : MoreSearchAdapterProvider.(MoreSearchAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:57) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 2) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? V20200730000000_AddGl2MessageIdFieldAliasForEvents$ElasticsearchAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:65) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : V20200730000000_AddGl2MessageIdFieldAliasForEventsElasticsearchAdapterProvider.(V20200730000000_AddGl2MessageIdFieldAliasForEventsElasticsearchAdapterProvider.java:34) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:65) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 3) [Guice/MissingImplementation]: No implementation for Map>> was bound. Did you mean? QueryBackend bound at VersionAwareStorageModule.bindQueryBackend(VersionAwareStorageModule.java:72) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : ElasticsearchBackendProvider.(ElasticsearchBackendProvider.java:33) \_ for 2nd parameter at VersionAwareStorageModule.bindQueryBackend(VersionAwareStorageModule.java:72) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 4) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) QuerySuggestionsService bound at ViewsBindings.configure(ViewsBindings.java:245) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : QuerySuggestionsProvider.(QuerySuggestionsProvider.java:31) \_ for 2nd parameter at ViewsBindings.configure(ViewsBindings.java:245) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 5) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) ExportBackend bound at ViewsBindings.registerExportBackendProvider(ViewsBindings.java:255) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : ExportBackendProvider.(ExportBackendProvider.java:31) \_ for 2nd parameter at ViewsBindings.registerExportBackendProvider(ViewsBindings.java:255) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 6) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? IndexToolsAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:62) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : IndexToolsAdapterProvider.(IndexToolsAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:62) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 7) [Guice/MissingImplementation]: No implementation for Map> was bound. Requested by: 1 : ClusterAdapterProvider.(ClusterAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:59) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 8) [Guice/MissingImplementation]: No implementation for Map> was bound. Requested by: 1 : NodeAdapterProvider.(NodeAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:60) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 9) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? CountsAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:54) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : CountsAdapterProvider.(CountsAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:54) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 10) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? IndexFieldTypePollerAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:61) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : IndexFieldTypePollerAdapterProvider.(IndexFieldTypePollerAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:61) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 11) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? StreamsForFieldRetriever bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:53) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : StreamsForFieldRetrieverProvider.(StreamsForFieldRetrieverProvider.java:33) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:53) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 12) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? IndicesAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:55) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : IndicesAdapterProvider.(IndicesAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:55) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 13) [Guice/MissingImplementation]: No implementation for Map> was bound. Requested by: 1 : MessagesAdapterProvider.(MessagesAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:58) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 14) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? SearchesAdapter bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:56) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : SearchesAdapterProvider.(SearchesAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:56) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 15) [Guice/MissingImplementation]: No implementation for Map> was bound. Did you mean? V20170607164210_MigrateReopenedIndicesToAliases$ClusterState bound at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:63) SearchVersion annotated with interface DetectedSearchVersion bound at ElasticsearchModule.configure(ElasticsearchModule.java:30) SearchVersion annotated with @Named("elasticsearch_version") bound at NamedConfigParametersModule.registerParameters(NamedConfigParametersModule.java:80) Requested by: 1 : V20170607164210_MigrateReopenedIndicesToAliasesClusterStateAdapterProvider.(V20170607164210_MigrateReopenedIndicesToAliasesClusterStateAdapterProvider.java:31) \_ for 2nd parameter at VersionAwareStorageModule.configure(VersionAwareStorageModule.java:63) Learn more: https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION 15 errors ====================== Full classname legend: ====================== ClusterAdapter: "org.graylog2.indexer.cluster.ClusterAdapter" ClusterAdapterProvider: "org.graylog2.storage.providers.ClusterAdapterProvider" CountsAdapter: "org.graylog2.indexer.counts.CountsAdapter" CountsAdapterProvider: "org.graylog2.storage.providers.CountsAdapterProvider" DetectedSearchVersion: "org.graylog2.storage.DetectedSearchVersion" ElasticsearchBackendProvider: "org.graylog2.storage.providers.ElasticsearchBackendProvider" ElasticsearchModule: "org.graylog2.bindings.ElasticsearchModule" ExportBackend: "org.graylog.plugins.views.search.export.ExportBackend" ExportBackendProvider: "org.graylog.plugins.views.providers.ExportBackendProvider" GeneratedQueryContext: "org.graylog.plugins.views.search.engine.GeneratedQueryContext" IndexFieldTypePollerAdapter: "org.graylog2.indexer.fieldtypes.IndexFieldTypePollerAdapter" IndexFieldTypePollerAdapterProvider: "org.graylog2.storage.providers.IndexFieldTypePollerAdapterProvider" IndexToolsAdapter: "org.graylog2.indexer.IndexToolsAdapter" IndexToolsAdapterProvider: "org.graylog2.storage.providers.IndexToolsAdapterProvider" IndicesAdapter: "org.graylog2.indexer.indices.IndicesAdapter" IndicesAdapterProvider: "org.graylog2.storage.providers.IndicesAdapterProvider" MessagesAdapter: "org.graylog2.indexer.messages.MessagesAdapter" MessagesAdapterProvider: "org.graylog2.storage.providers.MessagesAdapterProvider" MoreSearchAdapter: "org.graylog.events.search.MoreSearchAdapter" MoreSearchAdapterProvider: "org.graylog2.storage.providers.MoreSearchAdapterProvider" Named: "com.google.inject.name.Named" NamedConfigParametersModule: "com.github.joschi.jadconfig.guice.NamedConfigParametersModule" NodeAdapter: "org.graylog2.indexer.cluster.NodeAdapter" NodeAdapterProvider: "org.graylog2.storage.providers.NodeAdapterProvider" Provider: "javax.inject.Provider" QueryBackend: "org.graylog.plugins.views.search.engine.QueryBackend" QuerySuggestionsProvider: "org.graylog.plugins.views.providers.QuerySuggestionsProvider" QuerySuggestionsService: "org.graylog.plugins.views.search.engine.QuerySuggestionsService" SearchVersion: "org.graylog2.storage.SearchVersion" SearchesAdapter: "org.graylog2.indexer.searches.SearchesAdapter" SearchesAdapterProvider: "org.graylog2.storage.providers.SearchesAdapterProvider" StreamsForFieldRetriever: "org.graylog2.indexer.fieldtypes.streamfiltered.esadapters.StreamsForFieldRetriever" StreamsForFieldRetrieverProvider: "org.graylog2.storage.providers.StreamsForFieldRetrieverProvider" V20170607164210_MigrateReopenedIndicesToAliases$ClusterState: "org.graylog2.migrations.V20170607164210_MigrateReopenedIndicesToAliases$ClusterState" V20170607164210_MigrateReopenedIndicesToAliasesClusterStateAdapterProvider: "org.graylog2.storage.providers.V20170607164210_MigrateReopenedIndicesToAliasesClusterStateAdapterProvider" V20200730000000_AddGl2MessageIdFieldAliasForEvents$ElasticsearchAdapter: "org.graylog.plugins.views.migrations.V20200730000000_AddGl2MessageIdFieldAliasForEvents$ElasticsearchAdapter" V20200730000000_AddGl2MessageIdFieldAliasForEventsElasticsearchAdapterProvider: "org.graylog2.storage.providers.V20200730000000_AddGl2MessageIdFieldAliasForEventsElasticsearchAdapterProvider" VersionAwareStorageModule: "org.graylog2.storage.VersionAwareStorageModule" ViewsBindings: "org.graylog.plugins.views.ViewsBindings" ======================== End of classname legend: ======================== at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:568) at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:163) at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:110) at com.google.inject.Guice.createInjector(Guice.java:87) at org.graylog2.shared.bindings.GuiceInjectorHolder.createInjector(GuiceInjectorHolder.java:34) at org.graylog2.bootstrap.CmdLineTool.setupInjector(CmdLineTool.java:502) at org.graylog2.bootstrap.CmdLineTool.doRun(CmdLineTool.java:306) at org.graylog2.bootstrap.CmdLineTool.run(CmdLineTool.java:260) at org.graylog2.bootstrap.Main.main(Main.java:45)

using libraries from java world, such as Guice;

As said in the title, we will focus on the dependency inversion principle and one of its application : dependency injection. For production-ready applications, it would be better to rely on a framework and not implement its own container. For it, the java ecosystem have 3 frameworks available : Spring, Guice and Dagger.

FaaS is specifically focused on building and running applications as a set of independent functions or microservices. Major cloud providers like AWS (Lambda), Microsoft Azure (Functions), and Google Cloud (Cloud Functions) offer FaaS platforms that allow developers to write and deploy individual functions without managing the underlying infrastructure.

So AWS Lambda is basically a serverless computing service that is offered by AWS. It enables developers to run the code in response to various events. It protects the developers from the pain of managing the servers. Using a serverless execution model helps the developers to handle provision, manage and scale the servers automatically. Through this approach the developers can fully focus on writing the code instead of dealing with other aspects.

The first product that popularized the term “serverless” was AWS Lambda, which is both the prototypical and archetypical function as a service provider. It also has a great name, which pings back to its envisioned place in the cloud of the future. In computer programming, a lambda, often referred to as a lambda function or lambda expression, is a concise way to represent an anonymous function, which is a function without a name. The concept originates from lambda calculus in mathematical logic and has been adopted by many programming languages, each with its own syntax and characteristics.

You can build a custom config rules in 2 ways, using AWS Lambda and CloudFormation Guard. Lambda gives you a lot of flexibility, but it also brings complexity of maintaining. CloudFormation Guard is a bit more lightweight in that regard. Yes, you still need to maintain the logic to determine when your resource is compliant or not. But you need to do this in both cases, thus my go to preference is CloudFormation Guard.

AWS Lambda: https://aws.amazon.com/lambda/

This blog details how you can use some key serverless components from AWS like Amazon Eventbridge, AWS Lambda, and Simple Notification Service to setup a system that will monitor your site (which can be running anywhere) and send emails, text messages, slack messages, and more when the reachability status of your site changes.

I use the OpenWeather API to receive the current temperature data by providing the latitude and longitude coordinates as query strings in the request. A Lambda function invokes the weather API and sends the current temperature value as a custom metric to CloudWatch. I then graph the temperature values on a dashboard and activate an alarm when the temperature sinks below zero degrees Celsius.

After two years, I moved to a Web3 startup where I was given a lead software engineer role. This new role gave me more hands-on experience with AWS, where I've learned to implement serverless technologies like Lambda and DynamoDB.

I discussed a way to control access to endpoints using JSON web tokens and a Lambda authorizer earlier.