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ServiceReference.java
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ServiceReference.java
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/*
* Copyright 2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.gradle.api.services;
import org.gradle.api.Incubating;
import org.gradle.api.provider.Property;
import org.gradle.api.tasks.Optional;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* <p>Marks a task property as being a holder to a {@link BuildService}.</p>
*
* <p>
* When you annotate a shared build service property with this annotation,
* there is no need to explicitly declare the association between the task and the service;
* also, if you provide a service name to the annotation, and a shared build service is
* registered with that name, it will be automatically assigned to the property when the
* task is created.
* </p>
* <p>
* It is an error to apply this annotation to a property whose type is not a subtype of {@link BuildService}.
* </p>
*
* @since 8.0
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.FIELD})
@Incubating
public @interface ServiceReference {
/**
* <p>The optional name of the service which the annotated element references.</p>
*
* <p>
* In case a service name is provided, if a shared build service is registered with that name,
* a provider to the service will be automatically assigned to the property.
* </p>
* <p>
* If a shared build service with the specified name is not found, and no value or convention
* is explicitly set on the property:
* </p>
* <ul>
* <li>if the property is optional, an exception will only occur if an attempt is made to obtain the value of the property (see {@link Property#get()});</li>
* <li>if the property is mandatory, before the task starts executing, a validation error will be issued.</li>
* </ul>
*
* @see Optional
* @see Property#get()
*/
String value() default "";
}