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package net.peierls.util;

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

import com.google.inject.ScopeAnnotation;

/**
 * Apply this to implementation classes when you want only one instance
 * (per {@link Injector}) to be reused for all injections for that binding,
 * and you want to eagerly create the instance concurrently in the background
 * with other singletons in this scope.
 */
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RUNTIME)
@ScopeAnnotation
public @interface ConcurrentSingleton {}