| /* |
| * 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| * @throws java.lang.IllegalStateException if the service is no longer valid |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| checkState(isValid, "Provider service is no longer valid"); |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; |
| } |
| |
| } |