pekko/akka-docs/rst/java/code/docs/persistence/PersistenceDocTest.java

package docs.persistence;

import scala.Option;

import akka.actor.*;
import akka.persistence.*;

public class PersistenceDocTest {

    public interface ProcessorMethods {
        //#processor-id
        public String processorId();
        //#processor-id
        //#recovery-status
        public boolean recoveryRunning();
        public boolean recoveryFinished();
        //#recovery-status
        //#current-message
        public Persistent getCurrentPersistentMessage();
        //#current-message
    }

    static Object o1 = new Object() {
        //#definition
        class MyProcessor extends UntypedProcessor {
            public void onReceive(Object message) throws Exception {
                if (message instanceof Persistent) {
                    // message has been written to journal
                    Persistent persistent = (Persistent)message;
                    Object payload = persistent.payload();
                    Long sequenceNr = persistent.sequenceNr();
                    // ...
                } else {
                    // message has not been written to journal
                }
            }
        }
        //#definition

        class MyActor extends UntypedActor {
            ActorRef processor;

            public MyActor() {
                //#usage
                processor = getContext().actorOf(Props.create(MyProcessor.class), "myProcessor");

                processor.tell(Persistent.create("foo"), null);
                processor.tell("bar", null);
                //#usage
            }

            public void onReceive(Object message) throws Exception {
                // ...
            }

            private void recover() {
                //#recover-explicit
                processor.tell(Recover.create(), null);
                //#recover-explicit
            }
        }
    };

    static Object o2 = new Object() {
        abstract class MyProcessor1 extends UntypedProcessor {
            //#recover-on-start-disabled
            @Override
            public void preStartProcessor() {}
            //#recover-on-start-disabled

            //#recover-on-restart-disabled
            @Override
            public void preRestartProcessor(Throwable reason, Option<Object> message) {}
            //#recover-on-restart-disabled
        }

        abstract class MyProcessor2 extends UntypedProcessor {
            //#recover-on-start-custom
            @Override
            public void preStartProcessor() {
                getSelf().tell(Recover.create(457L), null);
            }
            //#recover-on-start-custom
        }

        abstract class MyProcessor3 extends UntypedProcessor {
            //#deletion
            @Override
            public void preRestartProcessor(Throwable reason, Option<Object> message) throws Exception {
                if (message.isDefined() && message.get() instanceof Persistent) {
                    delete((Persistent) message.get());
                }
                super.preRestartProcessor(reason, message);
            }
            //#deletion
        }

        class MyProcessor4 extends UntypedProcessor implements ProcessorMethods {
            //#processor-id-override
            @Override
            public String processorId() {
                return "my-stable-processor-id";
            }
            //#processor-id-override
            @Override
            public void onReceive(Object message) throws Exception {}
        }
    };

    static Object o3 = new Object() {
        //#channel-example
        class MyProcessor extends UntypedProcessor {
            private final ActorRef destination;
            private final ActorRef channel;

            public MyProcessor() {
                this.destination = getContext().actorOf(Props.create(MyDestination.class));
                this.channel = getContext().actorOf(Channel.props(), "myChannel");
            }

            public void onReceive(Object message) throws Exception {
                if (message instanceof Persistent) {
                    Persistent p = (Persistent)message;
                    Persistent out = p.withPayload("done " + p.payload());
                    channel.tell(Deliver.create(out, destination), getSelf());
                }
            }
        }

        class MyDestination extends UntypedActor {
            public void onReceive(Object message) throws Exception {
                if (message instanceof Persistent) {
                    Persistent p = (Persistent)message;
                    System.out.println("received " + p.payload());
                    p.confirm();
                }
            }
        }
        //#channel-example

        class MyProcessor2 extends UntypedProcessor {
            private final ActorRef destination;
            private final ActorRef channel;

            public MyProcessor2(ActorRef destination) {
                this.destination = getContext().actorOf(Props.create(MyDestination.class));
                //#channel-id-override
                this.channel = getContext().actorOf(Channel.props("my-stable-channel-id"));
                //#channel-id-override
            }

            public void onReceive(Object message) throws Exception {
                if (message instanceof Persistent) {
                    Persistent p = (Persistent)message;
                    Persistent out = p.withPayload("done " + p.payload());
                    channel.tell(Deliver.create(out, destination), getSelf());

                    //#channel-example-reply
                    channel.tell(Deliver.create(out, getSender()), getSelf());
                    //#channel-example-reply
                    //#resolve-destination
                    channel.tell(Deliver.create(out, getSender(), Resolve.destination()), getSelf());
                    //#resolve-destination
                    //#resolve-sender
                    channel.tell(Deliver.create(out, destination, Resolve.sender()), getSender());
                    //#resolve-sender

                }
            }
        }
    };
}