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• 0.4.4
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• SnapshotHandler.java

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io.cloudstate.javasupport.eventsourced.SnapshotHandler Maven / Gradle / Ivy

package io.cloudstate.javasupport.eventsourced;

import io.cloudstate.javasupport.impl.CloudStateAnnotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Marks a method as a snapshot handler.
 *
 * 
If, when recovering an entity, that entity has a snapshot, the snapshot will be passed to a
 * corresponding snapshot handler method whose argument matches its type. The entity must set its
 * current state to that snapshot.
 *
 * 
An entity may declare more than one snapshot handler if it wants different handling for
 * different types.
 *
 * 
The snapshot handler method may additionally accept a {@link SnapshotContext} parameter,
 * allowing it to access context for the snapshot, if required.
 */
@CloudStateAnnotation
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface SnapshotHandler {}