org.apache.tapestry.ioc.annotations.Scope Maven / Gradle / Ivy

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// Copyright 2006, 2007 The Apache Software Foundation
//
// 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.apache.tapestry.ioc.annotations;

import org.apache.tapestry.ioc.ServiceBinder;
import org.apache.tapestry.ioc.ServiceLifecycle;
import org.apache.tapestry.ioc.services.ServiceLifecycleSource;

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

/**
 * An optional annotation that may be placed on a service building method of a module. The
 * annotation overrides the default scope for services (the default being a global singleton that is
 * instantiated on demand) for an alternate lifecycle. Alternate lifecycles are typically used to
 * bind a service implementation to a single thread or request. Modules may define new scopes. Each
 * scope should have a corresponding {@link ServiceLifecycle} implementation. The linkage from scope
 * name to service lifecycle occurs via a contribution to the {@link ServiceLifecycleSource} service
 * configuration.
 * 
 * The annotation may also be placed directly on a service implementation class, when using service
 * autobuilding (via the {@link ServiceBinder}.
 */
@Target(
        {TYPE, METHOD})
@Retention(RUNTIME)
@Documented
public @interface Scope
{
    /**
     * An identifier used to look up a non-default lifecycle.
     */
    String value();
}