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/*
* Copyright 2014 Open Networking Laboratory
*
* 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.onosproject.net.provider;
import static com.google.common.base.Preconditions.checkState;
/**
* Base implementation of a provider service, which tracks the provider to
* which it is issued and can be invalidated.
*
* @param <P> type of the information provider
*/
public abstract class AbstractProviderService<P extends Provider> implements ProviderService<P> {
private boolean isValid = true;
private final P provider;
/**
* Creates a provider service on behalf of the specified provider.
*
* @param provider provider to which this service is being issued
*/
protected AbstractProviderService(P provider) {
this.provider = provider;
}
/**
* Invalidates this provider service.
*/
public void invalidate() {
isValid = false;
}
/**
* Checks the validity of this provider service.
*
* @throws java.lang.IllegalStateException if the service is no longer valid
*/
public void checkValidity() {
checkState(isValid, "Provider service is no longer valid");
}
@Override
public P provider() {
return provider;
}
}
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