001package io.dinject;
002
003import java.lang.annotation.ElementType;
004import java.lang.annotation.Retention;
005import java.lang.annotation.RetentionPolicy;
006import java.lang.annotation.Target;
007
008/**
009 * Identify a bean as being the preferred bean to inject when multiple beans implement
010 * the intended interface.
011 *
012 * <pre>{@code
013 *
014 * @Primary
015 * @Singleton
016 * class PreferredEmailSender implements EmailSender {
017 *
018 *   ...
019 * }
020 * }</pre>
021 */
022@Target({ElementType.TYPE, ElementType.METHOD})
023@Retention(RetentionPolicy.RUNTIME)
024public @interface Primary {
025}