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• 0.4.4
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• Snapshot.java

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io.cloudstate.javasupport.eventsourced.Snapshot 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 method.
 *
 * 
An event sourced behavior may have at most one of these. When provided, it will be
 * periodically (every n events emitted) be invoked to retrieve a snapshot of the current
 * state, to be persisted, so that the event log can be loaded without replaying the entire history.
 *
 * 
The method must return the current state of the entity.
 *
 * 
The method may accept a {@link SnapshotContext} parameter.
 */
@CloudStateAnnotation
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Snapshot {}