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SERIALIZATION
DEPENDENCY INJECTION Dependency Injection. As of Akka.NET v1.4.15 we recommend to Akka.NET users adopt the Akka.DependencyInjection library, which integrates directly with Microsoft.Extensions.DependencyInjection and deprecates the previous Akka.DI.Core and CLASS ACTORSELECTION Resolves the IActorRef matching this selection. The result is returned as a Task that is completed with the IActorRef if such an actor exists. It is completed with failure ActorNotFoundException if no such actor exists or the identification didn't complete within the supplied timeout.. Under the hood it talks to the actor to verify its existence and acquire its IActorRefRECEIVEACTOR API
The supplied path is parsed as a System.URI, which basically means that it is split on / into path elements. If the path starts with /, it is absolute and the look-up starts at the root guardian (which is the parent of "/user"); otherwise it starts at the current actor.If a path element equals .., the look-up will take a step "up" towards the supervisor of the currently traversed actor FSM | AKKA.NET DOCUMENTATION The basic strategy is to declare the actor, inherit from FSM class and specifying the possible states and data values as type parameters. Within the body of the actor a DSL is used for declaring the state machine: StartWith defines the initial state and initial data. then there is one When (, () => {}) declaration per state to be handled. TESTING ACTOR SYSTEMS Testing Actor Systems. As with any piece of software, automated tests are a very important part of the development cycle. The actor model presents a different view on how units of code are delimited and how they interact, which has an influence on how to perform tests.FAULT TOLERANCE
AKKA.NET DOCUMENTATION Akka.NET is a toolkit and runtime for building highly concurrent, distributed, and fault tolerant event-driven applications on .NET & Mono. This community-driven port brings C# & F# developers the capabilities of the original Akka framework in Java/Scala. Learn about Akka for the JVM here. LOGGING | AKKA.NET DOCUMENTATION Logging. For more info see real Akka's documentation: http://doc.akka.io/docs/akka/2.0/scala/logging.html How to Log. To log in an actor, create a ROUTERS | AKKA.NET DOCUMENTATION Routers. A router is a special type of actor whose job is to route messages to other actors called routees.Different routers use different strategies to route messages efficiently.. Routers can be used inside or outside of an actor, and you can manage the routees yourself or use a self contained router actor with configuration capabilities, and can also resize dynamically under load.SERIALIZATION
DEPENDENCY INJECTION Dependency Injection. As of Akka.NET v1.4.15 we recommend to Akka.NET users adopt the Akka.DependencyInjection library, which integrates directly with Microsoft.Extensions.DependencyInjection and deprecates the previous Akka.DI.Core and CLASS ACTORSELECTION Resolves the IActorRef matching this selection. The result is returned as a Task that is completed with the IActorRef if such an actor exists. It is completed with failure ActorNotFoundException if no such actor exists or the identification didn't complete within the supplied timeout.. Under the hood it talks to the actor to verify its existence and acquire its IActorRefRECEIVEACTOR API
The supplied path is parsed as a System.URI, which basically means that it is split on / into path elements. If the path starts with /, it is absolute and the look-up starts at the root guardian (which is the parent of "/user"); otherwise it starts at the current actor.If a path element equals .., the look-up will take a step "up" towards the supervisor of the currently traversed actor FSM | AKKA.NET DOCUMENTATION The basic strategy is to declare the actor, inherit from FSM class and specifying the possible states and data values as type parameters. Within the body of the actor a DSL is used for declaring the state machine: StartWith defines the initial state and initial data. then there is one When (, () => {}) declaration per state to be handled. TESTING ACTOR SYSTEMS Testing Actor Systems. As with any piece of software, automated tests are a very important part of the development cycle. The actor model presents a different view on how units of code are delimited and how they interact, which has an influence on how to perform tests.FAULT TOLERANCE
SERIALIZATION
Serialization. One of the core concepts of any actor system like Akka.NET is the notion of message passing between actors. Since Akka.NET is network transparent, these actors can be located locally or remotely. As such the system needs a common exchange format to package messages into so that it can send them to receiving actors. QUICKSTART | AKKA.NET DOCUMENTATION A stream usually begins at a source, so this is also how we start an Akka Stream. Before we create one, we import the full complement of streaming tools: using Akka.Streams; using Akka.Streams.Dsl; Now we will start with a rather simple source, emitting the integers 1 to 100; Source source = Source.From (Enumerable.Range (1,100)) TESTING ACTOR SYSTEMS Testing Actor Systems. As with any piece of software, automated tests are a very important part of the development cycle. The actor model presents a different view on how units of code are delimited and how they interact, which has an influence on how to perform tests. FSM | AKKA.NET DOCUMENTATION The basic strategy is to declare the actor, inherit from FSM class and specifying the possible states and data values as type parameters. Within the body of the actor a DSL is used for declaring the state machine: StartWith defines the initial state and initial data. then there is one When (, () => {}) declaration per state to be handled. ACTOR REFERENCES, PATHS AND ADDRESSES Actor References, Paths and Addresses. This chapter describes how actors are identified and located within a possibly distributed actor system. It ties into the central idea that Actor Systems form intrinsic supervision hierarchies as well as that communication between actors is transparent with respect to their placement across multiple network nodes. I/O | AKKA.NET DOCUMENTATION Akka I/O. The I/O extension provides an non-blocking, event driven API that matches the underlying transports mechanism. Getting Started. Every I/O Driver has a special actor, called the manager, that serves as an entry point for the API.The manager for a particular driver is accessible through an extension method on ActorSystem.The following example shows how to get a reference to the TCP SCHEDULER | AKKA.NET DOCUMENTATION The scheduler interface. The actual scheduler implementation is defined by config and loaded upon ActorSystem start-up, which means that it is possible to provide a different one using the akka.scheduler.implementation configuration property. The referenced class must implement the Akka.Actor.IScheduler and Akka.Actor.IAdvancedScheduler interfaces. The cancellable interfaceSUPERVISION
Akka.NET implements a specific form called "parental supervision". Actors can only be created by other actors—where the top-level actor is provided by the library—and each created actor is supervised by its parent. This restriction makes the formation of actor supervision hierarchies implicit and encourages sound design decisions. ACTORS | AKKA.NET DOCUMENTATION Actors. The previous section about Actor Systems explained how actors form hierarchies and are the smallest unit when building an application. This section looks at one such actor in isolation, explaining the concepts you encounter while implementing it. AKKA.NET ALPAKKA DOCUMENTATION Build high-performance, streaming applications quickly and with less code.. Alpakka makes it easy to build high-performance streaming applications using common techologies like RabbitMQ, Kafka, Azure Service Bus in combination with Akka.NET and Akka.Streams.. This project is currently in beta, but is officially supported by Petabridge and the Akka.NET Project. AKKA.NET DOCUMENTATION Akka.NET is a toolkit and runtime for building highly concurrent, distributed, and fault tolerant event-driven applications on .NET & Mono. This community-driven port brings C# & F# developers the capabilities of the original Akka framework in Java/Scala. Learn about Akka for the JVM here.SERIALIZATION
LOGGING | AKKA.NET DOCUMENTATION Logging. For more info see real Akka's documentation: http://doc.akka.io/docs/akka/2.0/scala/logging.html How to Log. To log in an actor, create aRECEIVEACTOR API
The supplied path is parsed as a System.URI, which basically means that it is split on / into path elements. If the path starts with /, it is absolute and the look-up starts at the root guardian (which is the parent of "/user"); otherwise it starts at the current actor.If a path element equals .., the look-up will take a step "up" towards the supervisor of the currently traversed actor SCHEDULER | AKKA.NET DOCUMENTATION The scheduler interface. The actual scheduler implementation is defined by config and loaded upon ActorSystem start-up, which means that it is possible to provide a different one using the akka.scheduler.implementation configuration property. The referenced class must implement the Akka.Actor.IScheduler and Akka.Actor.IAdvancedScheduler interfaces. The cancellable interface ROUTERS | AKKA.NET DOCUMENTATION Routers. A router is a special type of actor whose job is to route messages to other actors called routees.Different routers use different strategies to route messages efficiently.. Routers can be used inside or outside of an actor, and you can manage the routees yourself or use a self contained router actor with configuration capabilities, and can also resize dynamically under load. DEPENDENCY INJECTION Dependency Injection. As of Akka.NET v1.4.15 we recommend to Akka.NET users adopt the Akka.DependencyInjection library, which integrates directly with Microsoft.Extensions.DependencyInjection and deprecates the previous Akka.DI.Core and CLASS ACTORSELECTION Resolves the IActorRef matching this selection. The result is returned as a Task that is completed with the IActorRef if such an actor exists. It is completed with failure ActorNotFoundException if no such actor exists or the identification didn't complete within the supplied timeout.. Under the hood it talks to the actor to verify its existence and acquire its IActorRef TESTING ACTOR SYSTEMS Testing Actor Systems. As with any piece of software, automated tests are a very important part of the development cycle. The actor model presents a different view on how units of code are delimited and how they interact, which has an influence on how to perform tests. ACTORBASE.BECOME METHOD Changes the actor's command behavior and replaces the current receive handler with the specified handler. AKKA.NET DOCUMENTATION Akka.NET is a toolkit and runtime for building highly concurrent, distributed, and fault tolerant event-driven applications on .NET & Mono. This community-driven port brings C# & F# developers the capabilities of the original Akka framework in Java/Scala. Learn about Akka for the JVM here.SERIALIZATION
LOGGING | AKKA.NET DOCUMENTATION Logging. For more info see real Akka's documentation: http://doc.akka.io/docs/akka/2.0/scala/logging.html How to Log. To log in an actor, create aRECEIVEACTOR API
The supplied path is parsed as a System.URI, which basically means that it is split on / into path elements. If the path starts with /, it is absolute and the look-up starts at the root guardian (which is the parent of "/user"); otherwise it starts at the current actor.If a path element equals .., the look-up will take a step "up" towards the supervisor of the currently traversed actor SCHEDULER | AKKA.NET DOCUMENTATION The scheduler interface. The actual scheduler implementation is defined by config and loaded upon ActorSystem start-up, which means that it is possible to provide a different one using the akka.scheduler.implementation configuration property. The referenced class must implement the Akka.Actor.IScheduler and Akka.Actor.IAdvancedScheduler interfaces. The cancellable interface ROUTERS | AKKA.NET DOCUMENTATION Routers. A router is a special type of actor whose job is to route messages to other actors called routees.Different routers use different strategies to route messages efficiently.. Routers can be used inside or outside of an actor, and you can manage the routees yourself or use a self contained router actor with configuration capabilities, and can also resize dynamically under load. DEPENDENCY INJECTION Dependency Injection. As of Akka.NET v1.4.15 we recommend to Akka.NET users adopt the Akka.DependencyInjection library, which integrates directly with Microsoft.Extensions.DependencyInjection and deprecates the previous Akka.DI.Core and CLASS ACTORSELECTION Resolves the IActorRef matching this selection. The result is returned as a Task that is completed with the IActorRef if such an actor exists. It is completed with failure ActorNotFoundException if no such actor exists or the identification didn't complete within the supplied timeout.. Under the hood it talks to the actor to verify its existence and acquire its IActorRef TESTING ACTOR SYSTEMS Testing Actor Systems. As with any piece of software, automated tests are a very important part of the development cycle. The actor model presents a different view on how units of code are delimited and how they interact, which has an influence on how to perform tests. ACTORBASE.BECOME METHOD Changes the actor's command behavior and replaces the current receive handler with the specified handler. RESOURCES | AKKA.NET DOCUMENTATION Resources Akka.NET Bootcamp. Akka.NET Bootcamp is a free, self-directed learning course brought to you by the folks at Petabridge.Over the three units of this bootcamp you will learn how to create fully-functional, real-world programs using Akka.NET actors andmany other parts of
PERSISTENCE
Persistence. Akka.Persistence plugin enables stateful actors to persist their internal state so that it can be recovered when an actor is started, restarted after a CLR crash or by a supervisor, or migrated in a cluster. The key concept behind Akka persistence is that only changes to an actor's internal state are persisted but never itscurrent
PART 1. TOP-LEVEL ARCHITECTURE Part 1: Top-level Architecture. In this and the following chapters, we will build a sample Akka.NET application to introduce you to the language of actors and how solutions can be formulated with them. It is a common hurdle for beginners to translate their project into actors even though they don't understand what they do on thehigh-level.
QUICKSTART | AKKA.NET DOCUMENTATION A stream usually begins at a source, so this is also how we start an Akka Stream. Before we create one, we import the full complement of streaming tools: using Akka.Streams; using Akka.Streams.Dsl; Now we will start with a rather simple source, emitting the integers 1 to 100; Source source = Source.From (Enumerable.Range (1,100)) MAILBOXES | AKKA.NET DOCUMENTATION In Akka.NET, Mailboxes hold messages that are destined for an actor. When you send a message to an actor, the message doesn't go directly to the actor, but goes to the actor's mailbox until the actor has time to process it. A mailbox can be described as a queue of messages. Messages are usually then delivered from the mailbox to the actor oneAKKA CONFIGURATION
Akka Configuration. Below is the default HOCON configuration for the base Akka package. ##### # Akka Actor Reference Config File # ##### # This is the reference config fileFAULT TOLERANCE
Fault Tolerance. As explained in Actor Systems each actor is the supervisor of its children, and as such each actor defines fault handling supervisor strategy. This strategy cannot be changed afterwards as it is an integral part of the actor system's structure. Fault Handling in Practice ACTOR REFERENCES, PATHS AND ADDRESSES Actor References, Paths and Addresses. This chapter describes how actors are identified and located within a possibly distributed actor system. It ties into the central idea that Actor Systems form intrinsic supervision hierarchies as well as that communication between actors is transparent with respect to their placement across multiple network nodes.CLASS POISONPILL
Sending a PoisonPill to an actor will stop the actor when the message is processed. PoisonPill is enqueued as ordinary messages and will be handled after messages that were already queued in the mailbox.. See also Kill which causes the actor to throw an ActorKilledException when it processes the message, which gets handled using the normal supervisor mechanism, and Stop(IActorRef) which ACTORBASE.BECOME METHOD Changes the actor's command behavior and replaces the current receive handler with the specified handler.Toggle navigation
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FOLLOW OUR TUTORIAL AND BUILD YOUR FIRST AKKA.NET APPLICATION TODAY. What's new in Akka.NET v1.4.0?Get Started Now
Read the documentation BUILD POWERFUL CONCURRENT & DISTRIBUTED APPLICATIONS MORE EASILY. Akka.NET is a toolkit and runtime for building highly concurrent, distributed, and fault tolerant event-driven applications on .NET &MONO.
This community-driven port brings C# & F# developers the capabilities of the original Akka framework in Java/Scala. Learn about Akka for the JVM here . __ SIMPLE CONCURRENCY & DISTRIBUTION Asynchronous and Distributed by design. High-level abstractions likeActors and FSM.
__ HIGH PERFORMANCE
50 million msg/sec on a single machine. Small memory footprint; ~2.5 million actors per GB of heap. __ RESILIENT BY DESIGN Write systems that self-heal. Remote and/or local supervisorhierarchies.
__ ELASTIC & DECENTRALIZED Adaptive load balancing, routing, partitioning and configuration-driven remoting.__ EXTENSIBLE
Use Akka.NET Extensions to adapt Akka to fit your needs.__ OPEN SOURCE
Akka.NET is released under the Apache 2 licenseACTOR MODEL
The Actor Model provides a higher level of abstraction for writing concurrent and distributed systems. It alleviates the developer from having to deal with explicit locking and thread management, making it easier to write correct concurrent and parallel systems. Actors were defined in the 1973 paper by Carl Hewitt but have been popularized by the Erlang language, and used for example at Ericsson with great success to build highly concurrent and reliable telecom systems.Read more
DISTRIBUTED BY DEFAULT Everything in Akka.NET is designed to work in a distributed setting: all interactions of actors use purely message passing and everythingis asynchronous.
This effort has been undertaken to ensure that all functions are available equally when running within a single process or on a cluster of hundreds of machines. The key for enabling this is to go from remote to local by way of optimization instead of trying to go from local to remote by way of generalization. See this classic paper for a detailed discussion on why the second approach is bound to fail.Read more
SUPERVISION & MONITORING Actors form a tree with actors being parents to the actors they'vecreated.
As a parent, the actor is responsible for handling its children’s failures (so-called supervision), forming a chain of responsibility, all the way to the top. When an actor crashes, its parent can either restart or stop it, or escalate the failure up the hierarchy of actors. This enables a clean set of semantics for managing failures in a concurrent, distributed system and allows for writing highly fault-tolerant systems that self-heal.Read more
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