org.osgi.service.component.annotations.ReferencePolicy Maven / Gradle / Ivy
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/*
* Copyright (c) OSGi Alliance (2011, 2017). All Rights Reserved.
*
* 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.osgi.service.component.annotations;
/**
* Policy for the {@link Reference} annotation.
*
* @author $Id: ed47ac8a5a202d5431898ebd99bca23f31e28ad0 $
*/
public enum ReferencePolicy {
/**
* The static policy is the most simple policy and is the default policy. A
* component instance never sees any of the dynamics. Component
* configurations are deactivated before any bound service for a reference
* having a static policy becomes unavailable. If a target service is
* available to replace the bound service which became unavailable, the
* component configuration must be reactivated and bound to the replacement
* service.
*/
STATIC("static"),
/**
* The dynamic policy is slightly more complex since the component
* implementation must properly handle changes in the set of bound services.
* With the dynamic policy, SCR can change the set of bound services without
* deactivating a component configuration. If the component uses method
* injection to access services, then the component instance will be
* notified of changes in the set of bound services by calls to the bind and
* unbind methods.
*/
DYNAMIC("dynamic");
private final String value;
ReferencePolicy(String value) {
this.value = value;
}
@Override
public String toString() {
return value;
}
}